Added in API level 1

Activity

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Kotlin |Java

open class Activity : ContextThemeWrapper, LayoutInflater.Factory2, Window.Callback, KeyEvent.Callback, View.OnCreateContextMenuListener, ComponentCallbacks2

kotlin.Any
↳	android.content.Context
	↳	android.content.ContextWrapper
		↳	android.view.ContextThemeWrapper
			↳	android.app.Activity

Known Direct Subclasses AccountAuthenticatorActivity, ActivityGroup, AliasActivity, ExpandableListActivity, ListActivity, NativeActivity AccountAuthenticatorActivity Base class for implementing an Activity that is used to help implement an AbstractAccountAuthenticator. ActivityGroup A screen that contains and runs multiple embedded activities. AliasActivity Stub activity that launches another activity (and then finishes itself) based on information in its component's manifest meta-data. ExpandableListActivity An activity that displays an expandable list of items by binding to a data source implementing the ExpandableListAdapter, and exposes event handlers when the user selects an item. ListActivity An activity that displays a list of items by binding to a data source such as an array or Cursor, and exposes event handlers when the user selects an item. NativeActivity Convenience for implementing an activity that will be implemented purely in native code.

Known Indirect Subclasses LauncherActivity, PreferenceActivity, TabActivity LauncherActivity Displays a list of all activities which can be performed for a given intent. PreferenceActivity This is the base class for an activity to show a hierarchy of preferences to the user. TabActivity For apps developing against android.os.Build.VERSION_CODES#HONEYCOMB or later, tabs are typically presented in the UI using the new ActionBar.newTab() and related APIs for placing tabs within their action bar area.

An activity is a single, focused thing that the user can do. Almost all activities interact with the user, so the Activity class takes care of creating a window for you in which you can place your UI with #setContentView. While activities are often presented to the user as full-screen windows, they can also be used in other ways: as floating windows (via a theme with android.R.attr#windowIsFloating set), Multi-Window mode or embedded into other windows. There are two methods almost all subclasses of Activity will implement:

• #onCreate is where you initialize your activity. Most importantly, here you will usually call setContentView(int) with a layout resource defining your UI, and using findViewById to retrieve the widgets in that UI that you need to interact with programmatically.
• onPause is where you deal with the user pausing active interaction with the activity. Any changes made by the user should at this point be committed (usually to the android.content.ContentProvider holding the data). In this state the activity is still visible on screen.

To be of use with android.content.Context#startActivity, all activity classes must have a corresponding <activity> declaration in their package's AndroidManifest.xml.

Topics covered here:

1. Fragments
2. Activity Lifecycle
3. Configuration Changes
4. Starting Activities and Getting Results
5. Saving Persistent State
6. Permissions
7. Process Lifecycle

Developer Guides

The Activity class is an important part of an application's overall lifecycle, and the way activities are launched and put together is a fundamental part of the platform's application model. For a detailed perspective on the structure of an Android application and how activities behave, please read the Application Fundamentals and Tasks and Back Stack developer guides.

You can also find a detailed discussion about how to create activities in the Activities developer guide.

Fragments

The androidx.fragment.app.FragmentActivity subclass can make use of the androidx.fragment.app.Fragment class to better modularize their code, build more sophisticated user interfaces for larger screens, and help scale their application between small and large screens.

For more information about using fragments, read the Fragments developer guide.

Activity Lifecycle

Activities in the system are managed as activity stacks. When a new activity is started, it is usually placed on the top of the current stack and becomes the running activity -- the previous activity always remains below it in the stack, and will not come to the foreground again until the new activity exits. There can be one or multiple activity stacks visible on screen.

An activity has essentially four states:

• If an activity is in the foreground of the screen (at the highest position of the topmost stack), it is active or running. This is usually the activity that the user is currently interacting with.
• If an activity has lost focus but is still presented to the user, it is visible. It is possible if a new non-full-sized or transparent activity has focus on top of your activity, another activity has higher position in multi-window mode, or the activity itself is not focusable in current windowing mode. Such activity is completely alive (it maintains all state and member information and remains attached to the window manager).
• If an activity is completely obscured by another activity, it is stopped or hidden. It still retains all state and member information, however, it is no longer visible to the user so its window is hidden and it will often be killed by the system when memory is needed elsewhere.
• The system can drop the activity from memory by either asking it to finish, or simply killing its process, making it destroyed. When it is displayed again to the user, it must be completely restarted and restored to its previous state.

The following diagram shows the important state paths of an Activity. The square rectangles represent callback methods you can implement to perform operations when the Activity moves between states. The colored ovals are major states the Activity can be in.

There are three key loops you may be interested in monitoring within your activity:

• The entire lifetime of an activity happens between the first call to android.app.Activity#onCreate through to a single final call to android.app.Activity#onDestroy. An activity will do all setup of "global" state in onCreate(), and release all remaining resources in onDestroy(). For example, if it has a thread running in the background to download data from the network, it may create that thread in onCreate() and then stop the thread in onDestroy().
• The visible lifetime of an activity happens between a call to android.app.Activity#onStart until a corresponding call to android.app.Activity#onStop. During this time the user can see the activity on-screen, though it may not be in the foreground and interacting with the user. Between these two methods you can maintain resources that are needed to show the activity to the user. For example, you can register a android.content.BroadcastReceiver in onStart() to monitor for changes that impact your UI, and unregister it in onStop() when the user no longer sees what you are displaying. The onStart() and onStop() methods can be called multiple times, as the activity becomes visible and hidden to the user.
• The foreground lifetime of an activity happens between a call to android.app.Activity#onResume until a corresponding call to android.app.Activity#onPause. During this time the activity is visible, active and interacting with the user. An activity can frequently go between the resumed and paused states -- for example when the device goes to sleep, when an activity result is delivered, when a new intent is delivered -- so the code in these methods should be fairly lightweight.

The entire lifecycle of an activity is defined by the following Activity methods. All of these are hooks that you can override to do appropriate work when the activity changes state. All activities will implement android.app.Activity#onCreate to do their initial setup; many will also implement android.app.Activity#onPause to commit changes to data and prepare to pause interacting with the user, and android.app.Activity#onStop to handle no longer being visible on screen. You should always call up to your superclass when implementing these methods.

public class Activity extends ApplicationContext {
      protected void onCreate(Bundle savedInstanceState);
 
      protected void onStart();
 
      protected void onRestart();
 
      protected void onResume();
 
      protected void onPause();
 
      protected void onStop();
 
      protected void onDestroy();
  }
  

In general the movement through an activity's lifecycle looks like this:

Method			Description	Killable?	Next
android.app.Activity#onCreate			Called when the activity is first created. This is where you should do all of your normal static set up: create views, bind data to lists, etc. This method also provides you with a Bundle containing the activity's previously frozen state, if there was one. Always followed by onStart().	No	onStart()
	onRestart()		Called after your activity has been stopped, prior to it being started again. Always followed by onStart()	No	onStart()
	onStart()		Called when the activity is becoming visible to the user. Followed by onResume() if the activity comes to the foreground, or onStop() if it becomes hidden.	No	onResume() or onStop()
		onResume()	Called when the activity will start interacting with the user. At this point your activity is at the top of its activity stack, with user input going to it. Always followed by onPause().	No	onPause()
		onPause()	Called when the activity loses foreground state, is no longer focusable or before transition to stopped/hidden or destroyed state. The activity is still visible to user, so it's recommended to keep it visually active and continue updating the UI. Implementations of this method must be very quick because the next activity will not be resumed until this method returns. Followed by either onResume() if the activity returns back to the front, or onStop() if it becomes invisible to the user.	Pre-android.os.Build.VERSION_CODES#HONEYCOMB	onResume() or onStop()
	onStop()		Called when the activity is no longer visible to the user. This may happen either because a new activity is being started on top, an existing one is being brought in front of this one, or this one is being destroyed. This is typically used to stop animations and refreshing the UI, etc. Followed by either onRestart() if this activity is coming back to interact with the user, or onDestroy() if this activity is going away.	Yes	onRestart() or onDestroy()
onDestroy()			The final call you receive before your activity is destroyed. This can happen either because the activity is finishing (someone called Activity#finish on it), or because the system is temporarily destroying this instance of the activity to save space. You can distinguish between these two scenarios with the android.app.Activity#isFinishing method.	Yes	nothing

Note the "Killable" column in the above table -- for those methods that are marked as being killable, after that method returns the process hosting the activity may be killed by the system at any time without another line of its code being executed. Because of this, you should use the onPause method to write any persistent data (such as user edits) to storage. In addition, the method onSaveInstanceState(android.os.Bundle) is called before placing the activity in such a background state, allowing you to save away any dynamic instance state in your activity into the given Bundle, to be later received in #onCreate if the activity needs to be re-created. See the Process Lifecycle section for more information on how the lifecycle of a process is tied to the activities it is hosting. Note that it is important to save persistent data in onPause instead of #onSaveInstanceState because the latter is not part of the lifecycle callbacks, so will not be called in every situation as described in its documentation.

Be aware that these semantics will change slightly between applications targeting platforms starting with android.os.Build.VERSION_CODES#HONEYCOMB vs. those targeting prior platforms. Starting with Honeycomb, an application is not in the killable state until its onStop has returned. This impacts when onSaveInstanceState(android.os.Bundle) may be called (it may be safely called after onPause()) and allows an application to safely wait until onStop() to save persistent state.

For applications targeting platforms starting with android.os.Build.VERSION_CODES#P onSaveInstanceState(android.os.Bundle) will always be called after onStop, so an application may safely perform fragment transactions in onStop and will be able to save persistent state later.

For those methods that are not marked as being killable, the activity's process will not be killed by the system starting from the time the method is called and continuing after it returns. Thus an activity is in the killable state, for example, between after onStop() to the start of onResume(). Keep in mind that under extreme memory pressure the system can kill the application process at any time.

Configuration Changes

If the configuration of the device (as defined by the Resources.Configuration class) changes, then anything displaying a user interface will need to update to match that configuration. Because Activity is the primary mechanism for interacting with the user, it includes special support for handling configuration changes.

Unless you specify otherwise, a configuration change (such as a change in screen orientation, language, input devices, etc) will cause your current activity to be destroyed, going through the normal activity lifecycle process of onPause, onStop, and onDestroy as appropriate. If the activity had been in the foreground or visible to the user, once onDestroy is called in that instance then a new instance of the activity will be created, with whatever savedInstanceState the previous instance had generated from #onSaveInstanceState.

This is done because any application resource, including layout files, can change based on any configuration value. Thus the only safe way to handle a configuration change is to re-retrieve all resources, including layouts, drawables, and strings. Because activities must already know how to save their state and re-create themselves from that state, this is a convenient way to have an activity restart itself with a new configuration.

In some special cases, you may want to bypass restarting of your activity based on one or more types of configuration changes. This is done with the android:configChanges attribute in its manifest. For any types of configuration changes you say that you handle there, you will receive a call to your current activity's onConfigurationChanged method instead of being restarted. If a configuration change involves any that you do not handle, however, the activity will still be restarted and onConfigurationChanged will not be called.

Starting Activities and Getting Results

The android.app.Activity#startActivity method is used to start a new activity, which will be placed at the top of the activity stack. It takes a single argument, an Intent, which describes the activity to be executed.

Sometimes you want to get a result back from an activity when it ends. For example, you may start an activity that lets the user pick a person in a list of contacts; when it ends, it returns the person that was selected. To do this, you call the android.app.Activity#startActivityForResult(Intent, int) version with a second integer parameter identifying the call. The result will come back through your android.app.Activity#onActivityResult method.

When an activity exits, it can call android.app.Activity#setResult(int) to return data back to its parent. It must always supply a result code, which can be the standard results RESULT_CANCELED, RESULT_OK, or any custom values starting at RESULT_FIRST_USER. In addition, it can optionally return back an Intent containing any additional data it wants. All of this information appears back on the parent's Activity.onActivityResult(), along with the integer identifier it originally supplied.

If a child activity fails for any reason (such as crashing), the parent activity will receive a result with the code RESULT_CANCELED.

public class MyActivity extends Activity {
      ...
 
      static final int PICK_CONTACT_REQUEST = 0;
 
      public boolean onKeyDown(int keyCode, KeyEvent event) {
          if (keyCode == KeyEvent.KEYCODE_DPAD_CENTER) {
              // When the user center presses, let them pick a contact.
              startActivityForResult(
                  new Intent(Intent.ACTION_PICK,
                  new Uri("content://contacts")),
                  PICK_CONTACT_REQUEST);
             return true;
          }
          return false;
      }
 
      protected void onActivityResult(int requestCode, int resultCode,
              Intent data) {
          if (requestCode == PICK_CONTACT_REQUEST) {
              if (resultCode == RESULT_OK) {
                  // A contact was picked.  Here we will just display it
                  // to the user.
                  startActivity(new Intent(Intent.ACTION_VIEW, data));
              }
          }
      }
  }
  

Saving Persistent State

There are generally two kinds of persistent state that an activity will deal with: shared document-like data (typically stored in a SQLite database using a content provider) and internal state such as user preferences.

For content provider data, we suggest that activities use an "edit in place" user model. That is, any edits a user makes are effectively made immediately without requiring an additional confirmation step. Supporting this model is generally a simple matter of following two rules:

• When creating a new document, the backing database entry or file for it is created immediately. For example, if the user chooses to write a new email, a new entry for that email is created as soon as they start entering data, so that if they go to any other activity after that point this email will now appear in the list of drafts.

• When an activity's onPause() method is called, it should commit to the backing content provider or file any changes the user has made. This ensures that those changes will be seen by any other activity that is about to run. You will probably want to commit your data even more aggressively at key times during your activity's lifecycle: for example before starting a new activity, before finishing your own activity, when the user switches between input fields, etc.

This model is designed to prevent data loss when a user is navigating between activities, and allows the system to safely kill an activity (because system resources are needed somewhere else) at any time after it has been stopped (or paused on platform versions before android.os.Build.VERSION_CODES#HONEYCOMB). Note this implies that the user pressing BACK from your activity does not mean "cancel" -- it means to leave the activity with its current contents saved away. Canceling edits in an activity must be provided through some other mechanism, such as an explicit "revert" or "undo" option.

See the content package for more information about content providers. These are a key aspect of how different activities invoke and propagate data between themselves.

The Activity class also provides an API for managing internal persistent state associated with an activity. This can be used, for example, to remember the user's preferred initial display in a calendar (day view or week view) or the user's default home page in a web browser.

Activity persistent state is managed with the method getPreferences, allowing you to retrieve and modify a set of name/value pairs associated with the activity. To use preferences that are shared across multiple application components (activities, receivers, services, providers), you can use the underlying Context.getSharedPreferences() method to retrieve a preferences object stored under a specific name. (Note that it is not possible to share settings data across application packages -- for that you will need a content provider.)

Here is an excerpt from a calendar activity that stores the user's preferred view mode in its persistent settings:

public class CalendarActivity extends Activity {
      ...
 
      static final int DAY_VIEW_MODE = 0;
      static final int WEEK_VIEW_MODE = 1;
 
      private SharedPreferences mPrefs;
      private int mCurViewMode;
 
      protected void onCreate(Bundle savedInstanceState) {
          super.onCreate(savedInstanceState);
 
          mPrefs = getSharedPreferences(getLocalClassName(), MODE_PRIVATE);
          mCurViewMode = mPrefs.getInt("view_mode", DAY_VIEW_MODE);
      }
 
      protected void onPause() {
          super.onPause();
 
          SharedPreferences.Editor ed = mPrefs.edit();
          ed.putInt("view_mode", mCurViewMode);
          ed.commit();
      }
  }
  

Permissions

The ability to start a particular Activity can be enforced when it is declared in its manifest's <activity> tag. By doing so, other applications will need to declare a corresponding <uses-permission> element in their own manifest to be able to start that activity.

When starting an Activity you can set Intent.FLAG_GRANT_READ_URI_PERMISSION and/or Intent.FLAG_GRANT_WRITE_URI_PERMISSION on the Intent. This will grant the Activity access to the specific URIs in the Intent. Access will remain until the Activity has finished (it will remain across the hosting process being killed and other temporary destruction). As of android.os.Build.VERSION_CODES#GINGERBREAD, if the Activity was already created and a new Intent is being delivered to onNewIntent(android.content.Intent), any newly granted URI permissions will be added to the existing ones it holds.

See the Security and Permissions document for more information on permissions and security in general.

Process Lifecycle

The Android system attempts to keep an application process around for as long as possible, but eventually will need to remove old processes when memory runs low. As described in Activity Lifecycle, the decision about which process to remove is intimately tied to the state of the user's interaction with it. In general, there are four states a process can be in based on the activities running in it, listed here in order of importance. The system will kill less important processes (the last ones) before it resorts to killing more important processes (the first ones).

1. The foreground activity (the activity at the top of the screen that the user is currently interacting with) is considered the most important. Its process will only be killed as a last resort, if it uses more memory than is available on the device. Generally at this point the device has reached a memory paging state, so this is required in order to keep the user interface responsive.

2. A visible activity (an activity that is visible to the user but not in the foreground, such as one sitting behind a foreground dialog or next to other activities in multi-window mode) is considered extremely important and will not be killed unless that is required to keep the foreground activity running.

3. A background activity (an activity that is not visible to the user and has been stopped) is no longer critical, so the system may safely kill its process to reclaim memory for other foreground or visible processes. If its process needs to be killed, when the user navigates back to the activity (making it visible on the screen again), its #onCreate method will be called with the savedInstanceState it had previously supplied in #onSaveInstanceState so that it can restart itself in the same state as the user last left it.

4. An empty process is one hosting no activities or other application components (such as Service or android.content.BroadcastReceiver classes). These are killed very quickly by the system as memory becomes low. For this reason, any background operation you do outside of an activity must be executed in the context of an activity BroadcastReceiver or Service to ensure that the system knows it needs to keep your process around.

Sometimes an Activity may need to do a long-running operation that exists independently of the activity lifecycle itself. An example may be a camera application that allows you to upload a picture to a web site. The upload may take a long time, and the application should allow the user to leave the application while it is executing. To accomplish this, your Activity should start a Service in which the upload takes place. This allows the system to properly prioritize your process (considering it to be more important than other non-visible applications) for the duration of the upload, independent of whether the original activity is paused, stopped, or finished.

Summary

Nested classes
abstract	ScreenCaptureCallback Interface for observing screen captures of an Activity.

Constants
static Int	DEFAULT_KEYS_DIALER Use with setDefaultKeyMode to launch the dialer during default key handling.
static Int	DEFAULT_KEYS_DISABLE Use with setDefaultKeyMode to turn off default handling of keys.
static Int	DEFAULT_KEYS_SEARCH_GLOBAL Use with setDefaultKeyMode to specify that unhandled keystrokes will start a global search (typically web search, but some platforms may define alternate methods for global search)
static Int	DEFAULT_KEYS_SEARCH_LOCAL Use with setDefaultKeyMode to specify that unhandled keystrokes will start an application-defined search.
static Int	DEFAULT_KEYS_SHORTCUT Use with setDefaultKeyMode to execute a menu shortcut in default key handling.
static Int	FULLSCREEN_MODE_REQUEST_ENTER Request type of requestFullscreenMode(int,android.os.OutcomeReceiver), to request enter fullscreen mode from multi-window mode.
static Int	FULLSCREEN_MODE_REQUEST_EXIT Request type of requestFullscreenMode(int,android.os.OutcomeReceiver), to request exiting the requested fullscreen mode and restore to the previous multi-window mode.
static Int	OVERRIDE_TRANSITION_CLOSE Request type of overrideActivityTransition(int,int,int) or overrideActivityTransition(int,int,int,int), to override the closing transition.
static Int	OVERRIDE_TRANSITION_OPEN Request type of overrideActivityTransition(int,int,int) or overrideActivityTransition(int,int,int,int), to override the opening transition.
static Int	RESULT_CANCELED Standard activity result: operation canceled.
static Int	RESULT_FIRST_USER Start of user-defined activity results.
static Int	RESULT_OK Standard activity result: operation succeeded.

Inherited constants
From class Context String ACCESSIBILITY_SERVICE Use with getSystemService(java.lang.String) to retrieve a android.view.accessibility.AccessibilityManager for giving the user feedback for UI events through the registered event listeners. String ACCOUNT_SERVICE Use with getSystemService(java.lang.String) to retrieve a android.accounts.AccountManager for receiving intents at a time of your choosing. String ACTIVITY_SERVICE Use with getSystemService(java.lang.String) to retrieve a android.app.ActivityManager for interacting with the global system state. String ALARM_SERVICE Use with getSystemService(java.lang.String) to retrieve a android.app.AlarmManager for receiving intents at a time of your choosing. String APPWIDGET_SERVICE Use with getSystemService(java.lang.String) to retrieve a android.appwidget.AppWidgetManager for accessing AppWidgets. String APP_OPS_SERVICE Use with getSystemService(java.lang.String) to retrieve a android.app.AppOpsManager for tracking application operations on the device. String APP_SEARCH_SERVICE Use with getSystemService(java.lang.String) to retrieve an android.app.appsearch.AppSearchManager for indexing and querying app data managed by the system. String AUDIO_SERVICE Use with getSystemService(java.lang.String) to retrieve a android.media.AudioManager for handling management of volume, ringer modes and audio routing. String BATTERY_SERVICE Use with getSystemService(java.lang.String) to retrieve a android.os.BatteryManager for managing battery state. Int BIND_ABOVE_CLIENT Flag for #bindService: indicates that the client application binding to this service considers the service to be more important than the app itself. When set, the platform will try to have the out of memory killer kill the app before it kills the service it is bound to, though this is not guaranteed to be the case. Int BIND_ADJUST_WITH_ACTIVITY Flag for #bindService: If binding from an activity, allow the target service's process importance to be raised based on whether the activity is visible to the user, regardless whether another flag is used to reduce the amount that the client process's overall importance is used to impact it. Int BIND_ALLOW_ACTIVITY_STARTS Flag for #bindService: If binding from an app that is visible, the bound service is allowed to start an activity from background. This was the default behavior before SDK version android.os.Build.VERSION_CODES#UPSIDE_DOWN_CAKE. Since then, the default behavior changed to disallow the bound service to start a background activity even if the app bound to it is in foreground, unless this flag is specified when binding. Int BIND_ALLOW_OOM_MANAGEMENT Flag for #bindService: allow the process hosting the bound service to go through its normal memory management. It will be treated more like a running service, allowing the system to (temporarily) expunge the process if low on memory or for some other whim it may have, and being more aggressive about making it a candidate to be killed (and restarted) if running for a long time. Int BIND_AUTO_CREATE Flag for #bindService: automatically create the service as long as the binding exists. Note that while this will create the service, its android.app.Service#onStartCommand method will still only be called due to an explicit call to startService. Even without that, though, this still provides you with access to the service object while the service is created. Note that prior to android.os.Build.VERSION_CODES#ICE_CREAM_SANDWICH, not supplying this flag would also impact how important the system consider's the target service's process to be. When set, the only way for it to be raised was by binding from a service in which case it will only be important when that activity is in the foreground. Now to achieve this behavior you must explicitly supply the new flag BIND_ADJUST_WITH_ACTIVITY. For compatibility, old applications that don't specify BIND_AUTO_CREATE will automatically have the flags BIND_WAIVE_PRIORITY and BIND_ADJUST_WITH_ACTIVITY set for them in order to achieve the same result. Int BIND_DEBUG_UNBIND Flag for #bindService: include debugging help for mismatched calls to unbind. When this flag is set, the callstack of the following unbindService call is retained, to be printed if a later incorrect unbind call is made. Note that doing this requires retaining information about the binding that was made for the lifetime of the app, resulting in a leak -- this should only be used for debugging. Int BIND_EXTERNAL_SERVICE Flag for #bindService: The service being bound is an isolated, external service. This binds the service into the calling application's package, rather than the package in which the service is declared. When using this flag, the code for the service being bound will execute under the calling application's package name and user ID. Because the service must be an isolated process, it will not have direct access to the application's data, though. The purpose of this flag is to allow applications to provide services that are attributed to the app using the service, rather than the application providing the service. This flag is NOT compatible with BindServiceFlags. If you need to use BindServiceFlags, you must use BIND_EXTERNAL_SERVICE_LONG instead. Long BIND_EXTERNAL_SERVICE_LONG Works in the same way as BIND_EXTERNAL_SERVICE, but it's defined as a long value that is compatible to BindServiceFlags. Int BIND_IMPORTANT Flag for #bindService: this service is very important to the client, so should be brought to the foreground process level when the client is. Normally a process can only be raised to the visibility level by a client, even if that client is in the foreground. Int BIND_INCLUDE_CAPABILITIES Flag for #bindService: If binding from an app that has specific capabilities due to its foreground state such as an activity or foreground service, then this flag will allow the bound app to get the same capabilities, as long as it has the required permissions as well. If binding from a top app and its target SDK version is at or above android.os.Build.VERSION_CODES#R, the app needs to explicitly use BIND_INCLUDE_CAPABILITIES flag to pass all capabilities to the service so the other app can have while-in-use access such as location, camera, microphone from background. If binding from a top app and its target SDK version is below android.os.Build.VERSION_CODES#R, BIND_INCLUDE_CAPABILITIES is implicit. Int BIND_NOT_FOREGROUND Flag for #bindService: don't allow this binding to raise the target service's process to the foreground scheduling priority. It will still be raised to at least the same memory priority as the client (so that its process will not be killable in any situation where the client is not killable), but for CPU scheduling purposes it may be left in the background. This only has an impact in the situation where the binding client is a foreground process and the target service is in a background process. Int BIND_NOT_PERCEPTIBLE Flag for #bindService: If binding from an app that is visible or user-perceptible, lower the target service's importance to below the perceptible level. This allows the system to (temporarily) expunge the bound process from memory to make room for more important user-perceptible processes. Int BIND_PACKAGE_ISOLATED_PROCESS Flag for #bindIsolatedService: Bind the service into a shared isolated process, but only with other isolated services from the same package that declare the same process name. Specifying this flag allows multiple isolated services defined in the same package to be running in a single shared isolated process. This shared isolated process must be specified since this flag will not work with the default application process. This flag is different from BIND_SHARED_ISOLATED_PROCESS since it only allows binding services from the same package in the same shared isolated process. This also means the shared package isolated process is global, and not scoped to each potential calling app. The shared isolated process instance is identified by the "android:process" attribute defined by the service. This flag cannot be used without this attribute set. Int BIND_SHARED_ISOLATED_PROCESS Flag for #bindIsolatedService: Bind the service into a shared isolated process. Specifying this flag allows multiple isolated services to be running in a single shared isolated process. The shared isolated process instance is identified by the instanceName parameter in bindIsolatedService(android.content.Intent,int,java.lang.String,java.util.concurrent.Executor,android.content.ServiceConnection). Subsequent calls to #bindIsolatedService with the same instanceName will cause the isolated service to be co-located in the same shared isolated process. Note that the shared isolated process is scoped to the calling app; once created, only the calling app can bind additional isolated services into the shared process. However, the services themselves can come from different APKs and therefore different vendors. Only services that set the android.R.attr#allowSharedIsolatedProcess attribute to true are allowed to be bound into a shared isolated process. Int BIND_WAIVE_PRIORITY Flag for #bindService: don't impact the scheduling or memory management priority of the target service's hosting process. Allows the service's process to be managed on the background LRU list just like a regular application process in the background. String BIOMETRIC_SERVICE Use with getSystemService(java.lang.String) to retrieve a android.hardware.biometrics.BiometricManager for handling biometric and PIN/pattern/password authentication. String BLOB_STORE_SERVICE Use with getSystemService(java.lang.String) to retrieve a for contributing and accessing data blobs from the blob store maintained by the system. String BLUETOOTH_SERVICE Use with getSystemService(java.lang.String) to retrieve a android.bluetooth.BluetoothManager for using Bluetooth. String BUGREPORT_SERVICE Service to capture a bugreport. String CAMERA_SERVICE Use with getSystemService(java.lang.String) to retrieve a android.hardware.camera2.CameraManager for interacting with camera devices. String CAPTIONING_SERVICE Use with getSystemService(java.lang.String) to retrieve a android.view.accessibility.CaptioningManager for obtaining captioning properties and listening for changes in captioning preferences. String CARRIER_CONFIG_SERVICE Use with getSystemService(java.lang.String) to retrieve a android.telephony.CarrierConfigManager for reading carrier configuration values. String CLIPBOARD_SERVICE Use with getSystemService(java.lang.String) to retrieve a android.content.ClipboardManager for accessing and modifying the contents of the global clipboard. String COMPANION_DEVICE_SERVICE Use with getSystemService(java.lang.String) to retrieve a android.companion.CompanionDeviceManager for managing companion devices String CONNECTIVITY_DIAGNOSTICS_SERVICE Use with getSystemService(java.lang.String) to retrieve a for performing network connectivity diagnostics as well as receiving network connectivity information from the system. String CONNECTIVITY_SERVICE Use with getSystemService(java.lang.String) to retrieve a for handling management of network connections. String CONSUMER_IR_SERVICE Use with getSystemService(java.lang.String) to retrieve a android.hardware.ConsumerIrManager for transmitting infrared signals from the device. String CONTACT_KEYS_SERVICE Use with getSystemService(java.lang.String) to retrieve a E2eeContactKeysManager to managing contact keys. Int CONTEXT_IGNORE_SECURITY Flag for use with createPackageContext: ignore any security restrictions on the Context being requested, allowing it to always be loaded. For use with CONTEXT_INCLUDE_CODE to allow code to be loaded into a process even when it isn't safe to do so. Use with extreme care! Int CONTEXT_INCLUDE_CODE Flag for use with createPackageContext: include the application code with the context. This means loading code into the caller's process, so that getClassLoader() can be used to instantiate the application's classes. Setting this flags imposes security restrictions on what application context you can access; if the requested application can not be safely loaded into your process, java.lang.SecurityException will be thrown. If this flag is not set, there will be no restrictions on the packages that can be loaded, but getClassLoader will always return the default system class loader. Int CONTEXT_RESTRICTED Flag for use with createPackageContext: a restricted context may disable specific features. For instance, a View associated with a restricted context would ignore particular XML attributes. String CREDENTIAL_SERVICE Use with getSystemService(java.lang.String) to retrieve a android.credentials.CredentialManager to authenticate a user to your app. String CROSS_PROFILE_APPS_SERVICE Use with getSystemService(java.lang.String) to retrieve a android.content.pm.CrossProfileApps for cross profile operations. Int DEVICE_ID_DEFAULT The default device ID, which is the ID of the primary (non-virtual) device. Int DEVICE_ID_INVALID Invalid device ID. String DEVICE_LOCK_SERVICE Use with getSystemService(java.lang.String) to retrieve a android.devicelock.DeviceLockManager. String DEVICE_POLICY_SERVICE Use with getSystemService(java.lang.String) to retrieve a android.app.admin.DevicePolicyManager for working with global device policy management. String DISPLAY_HASH_SERVICE Use with getSystemService(java.lang.String) to access android.view.displayhash.DisplayHashManager to handle display hashes. String DISPLAY_SERVICE Use with getSystemService(java.lang.String) to retrieve a android.hardware.display.DisplayManager for interacting with display devices. String DOMAIN_VERIFICATION_SERVICE Use with getSystemService(java.lang.String) to access android.content.pm.verify.domain.DomainVerificationManager to retrieve approval and user state for declared web domains. String DOWNLOAD_SERVICE Use with getSystemService(java.lang.String) to retrieve a android.app.DownloadManager for requesting HTTP downloads. String DROPBOX_SERVICE Use with getSystemService(java.lang.String) to retrieve a android.os.DropBoxManager instance for recording diagnostic logs. String EUICC_SERVICE Use with getSystemService(java.lang.String) to retrieve a android.telephony.euicc.EuiccManager to manage the device eUICC (embedded SIM). String FILE_INTEGRITY_SERVICE Use with getSystemService(java.lang.String) to retrieve an android.security.FileIntegrityManager. String FINGERPRINT_SERVICE Use with getSystemService(java.lang.String) to retrieve a android.hardware.fingerprint.FingerprintManager for handling management of fingerprints. String GAME_SERVICE Use with getSystemService(java.lang.String) to retrieve a GameManager. String GRAMMATICAL_INFLECTION_SERVICE Use with getSystemService(java.lang.String) to retrieve a GrammaticalInflectionManager. String HARDWARE_PROPERTIES_SERVICE Use with getSystemService(java.lang.String) to retrieve a android.os.HardwarePropertiesManager for accessing the hardware properties service. String HEALTHCONNECT_SERVICE Use with getSystemService(java.lang.String) to retrieve a android.health.connect.HealthConnectManager. String INPUT_METHOD_SERVICE Use with getSystemService(java.lang.String) to retrieve a android.view.inputmethod.InputMethodManager for accessing input methods. String INPUT_SERVICE Use with getSystemService(java.lang.String) to retrieve a android.hardware.input.InputManager for interacting with input devices. String IPSEC_SERVICE Use with getSystemService(java.lang.String) to retrieve a android.net.IpSecManager for encrypting Sockets or Networks with IPSec. String JOB_SCHEDULER_SERVICE Use with getSystemService(java.lang.String) to retrieve a instance for managing occasional background tasks. String KEYGUARD_SERVICE Use with getSystemService(java.lang.String) to retrieve a android.app.KeyguardManager for controlling keyguard. String LAUNCHER_APPS_SERVICE Use with getSystemService(java.lang.String) to retrieve a android.content.pm.LauncherApps for querying and monitoring launchable apps across profiles of a user. String LAYOUT_INFLATER_SERVICE Use with getSystemService(java.lang.String) to retrieve a android.view.LayoutInflater for inflating layout resources in this context. String LOCALE_SERVICE Use with getSystemService(java.lang.String) to retrieve a android.app.LocaleManager. String LOCATION_SERVICE Use with getSystemService(java.lang.String) to retrieve a for controlling location updates. String MEDIA_COMMUNICATION_SERVICE Use with getSystemService(java.lang.String) to retrieve a android.media.MediaCommunicationManager for managing android.media.MediaSession2. String MEDIA_METRICS_SERVICE Use with getSystemService(java.lang.String) to retrieve a android.media.metrics.MediaMetricsManager for interacting with media metrics on the device. String MEDIA_PROJECTION_SERVICE Use with getSystemService(java.lang.String) to retrieve a instance for managing media projection sessions. String MEDIA_ROUTER_SERVICE Use with #getSystemService to retrieve a android.media.MediaRouter for controlling and managing routing of media. String MEDIA_SESSION_SERVICE Use with getSystemService(java.lang.String) to retrieve a android.media.session.MediaSessionManager for managing media Sessions. String MIDI_SERVICE Use with getSystemService(java.lang.String) to retrieve a android.media.midi.MidiManager for accessing the MIDI service. Int MODE_APPEND File creation mode: for use with openFileOutput, if the file already exists then write data to the end of the existing file instead of erasing it. Int MODE_ENABLE_WRITE_AHEAD_LOGGING Database open flag: when set, the database is opened with write-ahead logging enabled by default. Int MODE_MULTI_PROCESS SharedPreference loading flag: when set, the file on disk will be checked for modification even if the shared preferences instance is already loaded in this process. This behavior is sometimes desired in cases where the application has multiple processes, all writing to the same SharedPreferences file. Generally there are better forms of communication between processes, though. This was the legacy (but undocumented) behavior in and before Gingerbread (Android 2.3) and this flag is implied when targeting such releases. For applications targeting SDK versions greater than Android 2.3, this flag must be explicitly set if desired. Int MODE_NO_LOCALIZED_COLLATORS Database open flag: when set, the database is opened without support for localized collators. Int MODE_PRIVATE File creation mode: the default mode, where the created file can only be accessed by the calling application (or all applications sharing the same user ID). Int MODE_WORLD_READABLE File creation mode: allow all other applications to have read access to the created file. Starting from android.os.Build.VERSION_CODES#N, attempting to use this mode throws a SecurityException. Int MODE_WORLD_WRITEABLE File creation mode: allow all other applications to have write access to the created file. Starting from android.os.Build.VERSION_CODES#N, attempting to use this mode will throw a SecurityException. String NETWORK_STATS_SERVICE Use with getSystemService(java.lang.String) to retrieve a for querying network usage stats. String NFC_SERVICE Use with getSystemService(java.lang.String) to retrieve a android.nfc.NfcManager for using NFC. String NOTIFICATION_SERVICE Use with getSystemService(java.lang.String) to retrieve a android.app.NotificationManager for informing the user of background events. String NSD_SERVICE Use with getSystemService(java.lang.String) to retrieve a for handling management of network service discovery String OVERLAY_SERVICE Use with getSystemService(java.lang.String) to retrieve a for managing overlay packages. String PEOPLE_SERVICE Use with getSystemService(java.lang.String) to access a PeopleManager to interact with your published conversations. String PERFORMANCE_HINT_SERVICE Use with getSystemService(java.lang.String) to retrieve a android.os.PerformanceHintManager for accessing the performance hinting service. String PERSISTENT_DATA_BLOCK_SERVICE Use with getSystemService(java.lang.String) to retrieve a instance for interacting with a storage device that lives across factory resets. String POWER_SERVICE Use with getSystemService(java.lang.String) to retrieve a android.os.PowerManager for controlling power management, including "wake locks," which let you keep the device on while you're running long tasks. String PRINT_SERVICE android.print.PrintManager for printing and managing printers and print tasks. String PROFILING_SERVICE Use with getSystemService(java.lang.String) to retrieve an android.os.ProfilingManager. Int RECEIVER_EXPORTED Flag for #registerReceiver: The receiver can receive broadcasts from other Apps. Has the same behavior as marking a statically registered receiver with "exported=true" Int RECEIVER_NOT_EXPORTED Flag for #registerReceiver: The receiver cannot receive broadcasts from other Apps. Has the same behavior as marking a statically registered receiver with "exported=false" Int RECEIVER_VISIBLE_TO_INSTANT_APPS Flag for #registerReceiver: The receiver can receive broadcasts from Instant Apps. String RESTRICTIONS_SERVICE Use with getSystemService(java.lang.String) to retrieve a android.content.RestrictionsManager for retrieving application restrictions and requesting permissions for restricted operations. String ROLE_SERVICE Use with getSystemService(java.lang.String) to retrieve a android.app.role.RoleManager for managing roles. String SEARCH_SERVICE Use with getSystemService(java.lang.String) to retrieve a for handling searches. Configuration#UI_MODE_TYPE_WATCH does not support android.app.SearchManager. String SECURITY_STATE_SERVICE Use with getSystemService(java.lang.String) to retrieve a android.os.SecurityStateManager for accessing the security state manager service. String SENSOR_SERVICE Use with getSystemService(java.lang.String) to retrieve a for accessing sensors. String SHORTCUT_SERVICE Use with getSystemService(java.lang.String) to retrieve a android.content.pm.ShortcutManager for accessing the launcher shortcut service. String STATUS_BAR_SERVICE Use with getSystemService(java.lang.String) to retrieve a for interacting with the status bar and quick settings. String STORAGE_SERVICE Use with getSystemService(java.lang.String) to retrieve a for accessing system storage functions. String STORAGE_STATS_SERVICE Use with getSystemService(java.lang.String) to retrieve a for accessing system storage statistics. String SYSTEM_HEALTH_SERVICE Use with getSystemService(java.lang.String) to retrieve a android.os.health.SystemHealthManager for accessing system health (battery, power, memory, etc) metrics. String TELECOM_SERVICE Use with getSystemService(java.lang.String) to retrieve a android.telecom.TelecomManager to manage telecom-related features of the device. String TELEPHONY_IMS_SERVICE Use with getSystemService(java.lang.String) to retrieve an android.telephony.ims.ImsManager. String TELEPHONY_SERVICE Use with getSystemService(java.lang.String) to retrieve a android.telephony.TelephonyManager for handling management the telephony features of the device. String TELEPHONY_SUBSCRIPTION_SERVICE Use with getSystemService(java.lang.String) to retrieve a android.telephony.SubscriptionManager for handling management the telephony subscriptions of the device. String TEXT_CLASSIFICATION_SERVICE Use with getSystemService(java.lang.String) to retrieve a TextClassificationManager for text classification services. String TEXT_SERVICES_MANAGER_SERVICE Use with getSystemService(java.lang.String) to retrieve a android.view.textservice.TextServicesManager for accessing text services. String TV_INPUT_SERVICE Use with getSystemService(java.lang.String) to retrieve a android.media.tv.TvInputManager for interacting with TV inputs on the device. String TV_INTERACTIVE_APP_SERVICE Use with getSystemService(java.lang.String) to retrieve a android.media.tv.interactive.TvInteractiveAppManager for interacting with TV interactive applications on the device. String UI_MODE_SERVICE Use with getSystemService(java.lang.String) to retrieve a android.app.UiModeManager for controlling UI modes. String USAGE_STATS_SERVICE Use with getSystemService(java.lang.String) to retrieve a for querying device usage stats. String USB_SERVICE Use with getSystemService(java.lang.String) to retrieve a for access to USB devices (as a USB host) and for controlling this device's behavior as a USB device. String USER_SERVICE Use with getSystemService(java.lang.String) to retrieve a android.os.UserManager for managing users on devices that support multiple users. String VIBRATOR_MANAGER_SERVICE Use with getSystemService(java.lang.String) to retrieve a android.os.VibratorManager for accessing the device vibrators, interacting with individual ones and playing synchronized effects on multiple vibrators. String VIBRATOR_SERVICE Use with getSystemService(java.lang.String) to retrieve a android.os.Vibrator for interacting with the vibration hardware. String VIRTUAL_DEVICE_SERVICE Use with getSystemService(java.lang.String) to retrieve a android.companion.virtual.VirtualDeviceManager for managing virtual devices. On devices without PackageManager#FEATURE_COMPANION_DEVICE_SETUP system feature the getSystemService(java.lang.String) will return null. String VPN_MANAGEMENT_SERVICE Use with getSystemService(java.lang.String) to retrieve a android.net.VpnManager to manage profiles for the platform built-in VPN. String WALLPAPER_SERVICE Use with getSystemService(java.lang.String) to retrieve a com.android.server.WallpaperService for accessing wallpapers. String WIFI_AWARE_SERVICE Use with getSystemService(java.lang.String) to retrieve a android.net.wifi.aware.WifiAwareManager for handling management of Wi-Fi Aware. String WIFI_P2P_SERVICE Use with getSystemService(java.lang.String) to retrieve a for handling management of Wi-Fi peer-to-peer connections. String WIFI_RTT_RANGING_SERVICE Use with getSystemService(java.lang.String) to retrieve a for ranging devices with wifi. String WIFI_SERVICE Use with getSystemService(java.lang.String) to retrieve a for handling management of Wi-Fi access. String WINDOW_SERVICE Use with getSystemService(java.lang.String) to retrieve a android.view.WindowManager for accessing the system's window manager.
From class ComponentCallbacks2 Int TRIM_MEMORY_BACKGROUND Level for onTrimMemory(int): the process has gone on to the LRU list. This is a good opportunity to clean up resources that can efficiently and quickly be re-built if the user returns to the app. Int TRIM_MEMORY_COMPLETE Level for onTrimMemory(int): the process is nearing the end of the background LRU list, and if more memory isn't found soon it will be killed. Int TRIM_MEMORY_MODERATE Level for onTrimMemory(int): the process is around the middle of the background LRU list; freeing memory can help the system keep other processes running later in the list for better overall performance. Int TRIM_MEMORY_RUNNING_CRITICAL Level for onTrimMemory(int): the process is not an expendable background process, but the device is running extremely low on memory and is about to not be able to keep any background processes running. Your running process should free up as many non-critical resources as it can to allow that memory to be used elsewhere. The next thing that will happen after this is onLowMemory() called to report that nothing at all can be kept in the background, a situation that can start to notably impact the user. Int TRIM_MEMORY_RUNNING_LOW Level for onTrimMemory(int): the process is not an expendable background process, but the device is running low on memory. Your running process should free up unneeded resources to allow that memory to be used elsewhere. Int TRIM_MEMORY_RUNNING_MODERATE Level for onTrimMemory(int): the process is not an expendable background process, but the device is running moderately low on memory. Your running process may want to release some unneeded resources for use elsewhere. Int TRIM_MEMORY_UI_HIDDEN Level for onTrimMemory(int): the process had been showing a user interface, and is no longer doing so. Large allocations with the UI should be released at this point to allow memory to be better managed.

Public constructors
Activity()

Public methods
open Unit	addContentView(view: View!, params: ViewGroup.LayoutParams!) Add an additional content view to the activity.
open Unit	clearOverrideActivityTransition(overrideType: Int) Clears the animations which are set from #overrideActivityTransition.
open Unit	closeContextMenu() Programmatically closes the most recently opened context menu, if showing.
open Unit	closeOptionsMenu() Progammatically closes the options menu.
open PendingIntent!	createPendingResult(requestCode: Int, data: Intent, flags: Int) Create a new PendingIntent object which you can hand to others for them to use to send result data back to your #onActivityResult callback.
Unit	dismissDialog(id: Int) Dismiss a dialog that was previously shown via showDialog(int).
Unit	dismissKeyboardShortcutsHelper() Dismiss the Keyboard Shortcuts screen.
open Boolean	dispatchGenericMotionEvent(ev: MotionEvent!) Called to process generic motion events.
open Boolean	dispatchKeyEvent(event: KeyEvent!) Called to process key events.
open Boolean	dispatchKeyShortcutEvent(event: KeyEvent!) Called to process a key shortcut event.
open Boolean	dispatchPopulateAccessibilityEvent(event: AccessibilityEvent!)
open Boolean	dispatchTouchEvent(ev: MotionEvent!) Called to process touch screen events.
open Boolean	dispatchTrackballEvent(ev: MotionEvent!) Called to process trackball events.
open Unit	dump(prefix: String, fd: FileDescriptor?, writer: PrintWriter, args: Array<String!>?) Print the Activity's state into the given stream.
open Unit	enterPictureInPictureMode() Puts the activity in picture-in-picture mode if possible in the current system state.
open Boolean	enterPictureInPictureMode(params: PictureInPictureParams) Puts the activity in picture-in-picture mode if possible in the current system state.
open T	findViewById(id: Int) Finds a view that was identified by the android:id XML attribute that was processed in #onCreate.
open Unit	finish() Call this when your activity is done and should be closed.
open Unit	finishActivity(requestCode: Int) Force finish another activity that you had previously started with #startActivityForResult.
open Unit	finishActivityFromChild(child: Activity, requestCode: Int) This is called when a child activity of this one calls its finishActivity().
open Unit	finishAffinity() Finish this activity as well as all activities immediately below it in the current task that have the same affinity.
open Unit	finishAfterTransition() Reverses the Activity Scene entry Transition and triggers the calling Activity to reverse its exit Transition.
open Unit	finishAndRemoveTask() Call this when your activity is done and should be closed and the task should be completely removed as a part of finishing the root activity of the task.
open Unit	finishFromChild(child: Activity!) This is called when a child activity of this one calls its finish method.
open ActionBar?	getActionBar() Retrieve a reference to this activity's ActionBar.
Application!	getApplication() Return the application that owns this activity.
open ComponentCaller?	getCaller() Returns the ComponentCaller instance of the app that started this activity.
open ComponentName?	getCallingActivity() Return the name of the activity that invoked this activity.
open String?	getCallingPackage() Return the name of the package that invoked this activity.
open Int	getChangingConfigurations() If this activity is being destroyed because it can not handle a configuration parameter being changed (and thus its onConfigurationChanged(android.content.res.Configuration) method is not being called), then you can use this method to discover the set of changes that have occurred while in the process of being destroyed.
open ComponentName!	getComponentName() Returns the complete component name of this activity.
open Scene!	getContentScene() Retrieve the Scene representing this window's current content.
open TransitionManager!	getContentTransitionManager() Retrieve the TransitionManager responsible for default transitions in this window.
open ComponentCaller	getCurrentCaller() Returns the ComponentCaller instance of the app that re-launched this activity with a new intent via #onNewIntent or #onActivityResult.
open View?	getCurrentFocus() Calls android.view.Window#getCurrentFocus on the Window of this Activity to return the currently focused view.
open FragmentManager!	getFragmentManager() Return the FragmentManager for interacting with fragments associated with this activity.
open ComponentCaller	getInitialCaller() Returns the ComponentCaller instance of the app that initially launched this activity.
open Intent!	getIntent() Returns the intent that started this activity.
open Any?	getLastNonConfigurationInstance() Retrieve the non-configuration instance data that was previously returned by onRetainNonConfigurationInstance().
open String?	getLaunchedFromPackage() Returns the package name of the app that initially launched this activity.
open Int	getLaunchedFromUid() Returns the uid of the app that initially launched this activity.
open LayoutInflater	getLayoutInflater() Convenience for calling android.view.Window#getLayoutInflater.
open LoaderManager!	getLoaderManager() Return the LoaderManager for this activity, creating it if needed.
open String	getLocalClassName() Returns class name for this activity with the package prefix removed.
open Int	getMaxNumPictureInPictureActions() Return the number of actions that will be displayed in the picture-in-picture UI when the user interacts with the activity currently in picture-in-picture mode.
MediaController!	getMediaController() Gets the controller which should be receiving media key and volume events while this activity is in the foreground.
open MenuInflater	getMenuInflater() Returns a MenuInflater with this context.
open OnBackInvokedDispatcher	getOnBackInvokedDispatcher() Returns the OnBackInvokedDispatcher instance associated with the window that this activity is attached to.
Activity!	getParent() Returns the parent Activity if this is a child Activity of an ActivityGroup.
open Intent?	getParentActivityIntent() Obtain an Intent that will launch an explicit target activity specified by this activity's logical parent.
open SharedPreferences!	getPreferences(mode: Int) Retrieve a SharedPreferences object for accessing preferences that are private to this activity.
open Uri?	getReferrer() Return information about who launched this activity.
open Int	getRequestedOrientation() Return the current requested orientation of the activity.
SearchEvent!	getSearchEvent() During the onSearchRequested() callbacks, this function will return the SearchEvent that triggered the callback, if it exists.
SplashScreen	getSplashScreen() Get the interface that activity use to talk to the splash screen.
open Any!	getSystemService(name: String) Return the handle to a system-level service by name.
open Int	getTaskId() Return the identifier of the task this activity is in.
CharSequence!	getTitle()
Int	getTitleColor()
open VoiceInteractor!	getVoiceInteractor() Retrieve the active VoiceInteractor that the user is going through to interact with this activity.
Int	getVolumeControlStream() Gets the suggested audio stream whose volume should be changed by the hardware volume controls.
open Window!	getWindow() Retrieve the current android.view.Window for the activity.
open WindowManager!	getWindowManager() Retrieve the window manager for showing custom windows.
open Boolean	hasWindowFocus() Returns true if this activity's main window currently has window focus.
open Unit	invalidateOptionsMenu() Declare that the options menu has changed, so should be recreated.
open Boolean	isActivityTransitionRunning() Returns whether there are any activity transitions currently running on this activity.
open Boolean	isChangingConfigurations() Check to see whether this activity is in the process of being destroyed in order to be recreated with a new configuration.
Boolean	isChild() Whether this is a child Activity of an ActivityGroup.
open Boolean	isDestroyed() Returns true if the final onDestroy() call has been made on the Activity, so this instance is now dead.
open Boolean	isFinishing() Check to see whether this activity is in the process of finishing, either because you called finish on it or someone else has requested that it finished.
open Boolean	isImmersive() Bit indicating that this activity is "immersive" and should not be interrupted by notifications if possible.
open Boolean	isInMultiWindowMode() Returns true if the activity is currently in multi-window mode.
open Boolean	isInPictureInPictureMode() Returns true if the activity is currently in picture-in-picture mode.
open Boolean	isLaunchedFromBubble() Indicates whether this activity is launched from a bubble.
open Boolean	isLocalVoiceInteractionSupported() Queries whether the currently enabled voice interaction service supports returning a voice interactor for use by the activity.
open Boolean	isTaskRoot() Return whether this activity is the root of a task.
open Boolean	isVoiceInteraction() Check whether this activity is running as part of a voice interaction with the user.
open Boolean	isVoiceInteractionRoot() Like isVoiceInteraction, but only returns true if this is also the root of a voice interaction.
Cursor!	managedQuery(uri: Uri!, projection: Array<String!>!, selection: String!, selectionArgs: Array<String!>!, sortOrder: String!) Wrapper around ContentResolver#query(android.net.Uri , String[], String, String[], String) that gives the resulting Cursor to call startManagingCursor so that the activity will manage its lifecycle for you.
open Boolean	moveTaskToBack(nonRoot: Boolean) Move the task containing this activity to the back of the activity stack.
open Boolean	navigateUpTo(upIntent: Intent!) Navigate from this activity to the activity specified by upIntent, finishing this activity in the process.
open Boolean	navigateUpToFromChild(child: Activity!, upIntent: Intent!) This is called when a child activity of this one calls its navigateUpTo method.
open Unit	onActionModeFinished(mode: ActionMode!) Notifies the activity that an action mode has finished.
open Unit	onActionModeStarted(mode: ActionMode!) Notifies the Activity that an action mode has been started.
open Unit	onActivityReenter(resultCode: Int, data: Intent!) Called when an activity you launched with an activity transition exposes this Activity through a returning activity transition, giving you the resultCode and any additional data from it.
open Unit	onActivityResult(requestCode: Int, resultCode: Int, data: Intent?, caller: ComponentCaller) Same as onActivityResult(int,int,android.content.Intent), but with an extra parameter for the ComponentCaller instance associated with the app that sent the result.
open Unit	onAttachFragment(fragment: Fragment!) Called when a Fragment is being attached to this activity, immediately after the call to its android.
open Unit	onAttachedToWindow() Called when the main window associated with the activity has been attached to the window manager.
open Unit	onBackPressed() Called when the activity has detected the user's press of the back key.
open Unit	onConfigurationChanged(newConfig: Configuration) Called by the system when the device configuration changes while your activity is running.
open Unit	onContentChanged()
open Boolean	onContextItemSelected(item: MenuItem) This hook is called whenever an item in a context menu is selected.
open Unit	onContextMenuClosed(menu: Menu) This hook is called whenever the context menu is being closed (either by the user canceling the menu with the back/menu button, or when an item is selected).
open Unit	onCreate(savedInstanceState: Bundle?, persistentState: PersistableBundle?) Same as onCreate(android.os.Bundle) but called for those activities created with the attribute android.R.attr#persistableMode set to persistAcrossReboots.
open Unit	onCreateContextMenu(menu: ContextMenu!, v: View!, menuInfo: ContextMenu.ContextMenuInfo!) Called when a context menu for the view is about to be shown.
open CharSequence?	onCreateDescription() Generate a new description for this activity.
open Unit	onCreateNavigateUpTaskStack(builder: TaskStackBuilder!) Define the synthetic task stack that will be generated during Up navigation from a different task.
open Boolean	onCreateOptionsMenu(menu: Menu!) Initialize the contents of the Activity's standard options menu.
open Boolean	onCreatePanelMenu(featureId: Int, menu: Menu) Default implementation of android.view.Window.Callback#onCreatePanelMenu for activities.
open View?	onCreatePanelView(featureId: Int) Default implementation of android.view.Window.Callback#onCreatePanelView for activities.
open Boolean	onCreateThumbnail(outBitmap: Bitmap!, canvas: Canvas!)
open View?	onCreateView(name: String, context: Context, attrs: AttributeSet) Standard implementation of android.view.LayoutInflater.Factory#onCreateView used when inflating with the LayoutInflater returned by #getSystemService.
open View?	onCreateView(parent: View?, name: String, context: Context, attrs: AttributeSet) Standard implementation of android.view.LayoutInflater.Factory2#onCreateView(View, String, Context, AttributeSet) used when inflating with the LayoutInflater returned by #getSystemService.
open Unit	onDetachedFromWindow() Called when the main window associated with the activity has been detached from the window manager.
open Unit	onEnterAnimationComplete() Activities cannot draw during the period that their windows are animating in.
open Boolean	onGenericMotionEvent(event: MotionEvent!) Called when a generic motion event was not handled by any of the views inside of the activity.
open Unit	onGetDirectActions(cancellationSignal: CancellationSignal, callback: Consumer<MutableList<DirectAction!>!>) Returns the list of direct actions supported by the app.
open Boolean	onKeyDown(keyCode: Int, event: KeyEvent!) Called when a key was pressed down and not handled by any of the views inside of the activity.
open Boolean	onKeyLongPress(keyCode: Int, event: KeyEvent!) Default implementation of KeyEvent.Callback.onKeyLongPress(): always returns false (doesn't handle the event).
open Boolean	onKeyMultiple(keyCode: Int, repeatCount: Int, event: KeyEvent!) Default implementation of KeyEvent.Callback.onKeyMultiple(): always returns false (doesn't handle the event).
open Boolean	onKeyShortcut(keyCode: Int, event: KeyEvent!) Called when a key shortcut event is not handled by any of the views in the Activity.
open Boolean	onKeyUp(keyCode: Int, event: KeyEvent!) Called when a key was released and not handled by any of the views inside of the activity.
open Unit	onLocalVoiceInteractionStarted() Callback to indicate that startLocalVoiceInteraction(android.os.Bundle) has resulted in a voice interaction session being started.
open Unit	onLocalVoiceInteractionStopped() Callback to indicate that the local voice interaction has stopped either because it was requested through a call to stopLocalVoiceInteraction() or because it was canceled by the user.
open Unit	onLowMemory()
open Boolean	onMenuItemSelected(featureId: Int, item: MenuItem) Default implementation of android.view.Window.Callback#onMenuItemSelected for activities.
open Boolean	onMenuOpened(featureId: Int, menu: Menu) Called when a panel's menu is opened by the user.
open Unit	onMultiWindowModeChanged(isInMultiWindowMode: Boolean, newConfig: Configuration!) Called by the system when the activity changes from fullscreen mode to multi-window mode and visa-versa.
open Unit	onMultiWindowModeChanged(isInMultiWindowMode: Boolean) Called by the system when the activity changes from fullscreen mode to multi-window mode and visa-versa.
open Boolean	onNavigateUp() This method is called whenever the user chooses to navigate Up within your application's activity hierarchy from the action bar.
open Boolean	onNavigateUpFromChild(child: Activity!) This is called when a child activity of this one attempts to navigate up.
open Unit	onNewIntent(intent: Intent, caller: ComponentCaller) Same as onNewIntent(android.content.Intent), but with an extra parameter for the ComponentCaller instance associated with the app that sent the intent.
open Boolean	onOptionsItemSelected(item: MenuItem) This hook is called whenever an item in your options menu is selected.
open Unit	onOptionsMenuClosed(menu: Menu!) This hook is called whenever the options menu is being closed (either by the user canceling the menu with the back/menu button, or when an item is selected).
open Unit	onPanelClosed(featureId: Int, menu: Menu) Default implementation of android.view.Window.Callback#onPanelClosed(int, Menu) for activities.
open Unit	onPerformDirectAction(actionId: String, arguments: Bundle, cancellationSignal: CancellationSignal, resultListener: Consumer<Bundle!>) This is called to perform an action previously defined by the app.
open Unit	onPictureInPictureModeChanged(isInPictureInPictureMode: Boolean, newConfig: Configuration!) Called by the system when the activity changes to and from picture-in-picture mode.
open Unit	onPictureInPictureModeChanged(isInPictureInPictureMode: Boolean) Called by the system when the activity changes to and from picture-in-picture mode.
open Boolean	onPictureInPictureRequested() This method is called by the system in various cases where picture in picture mode should be entered if supported.
open Unit	onPictureInPictureUiStateChanged(pipState: PictureInPictureUiState) Called by the system when the activity is in PiP and has state changes.
open Unit	onPostCreate(savedInstanceState: Bundle?, persistentState: PersistableBundle?) This is the same as onPostCreate(android.os.Bundle) but is called for activities created with the attribute android.R.attr#persistableMode set to persistAcrossReboots.
open Unit	onPrepareNavigateUpTaskStack(builder: TaskStackBuilder!) Prepare the synthetic task stack that will be generated during Up navigation from a different task.
open Boolean	onPrepareOptionsMenu(menu: Menu!) Prepare the Screen's standard options menu to be displayed.
open Boolean	onPreparePanel(featureId: Int, view: View?, menu: Menu) Default implementation of android.view.Window.Callback#onPreparePanel for activities.
open Unit	onProvideAssistContent(outContent: AssistContent!) This is called when the user is requesting an assist, to provide references to content related to the current activity.
open Unit	onProvideAssistData(data: Bundle!) This is called when the user is requesting an assist, to build a full Intent#ACTION_ASSIST Intent with all of the context of the current application.
open Unit	onProvideKeyboardShortcuts(data: MutableList<KeyboardShortcutGroup!>!, menu: Menu?, deviceId: Int)
open Uri!	onProvideReferrer() Override to generate the desired referrer for the content currently being shown by the app.
open Unit	onRequestPermissionsResult(requestCode: Int, permissions: Array<String!>, grantResults: IntArray) Callback for the result from requesting permissions.
open Unit	onRequestPermissionsResult(requestCode: Int, permissions: Array<String!>, grantResults: IntArray, deviceId: Int) Callback for the result from requesting permissions.
open Unit	onRestoreInstanceState(savedInstanceState: Bundle?, persistentState: PersistableBundle?) This is the same as onRestoreInstanceState(android.os.Bundle) but is called for activities created with the attribute android.R.attr#persistableMode set to persistAcrossReboots.
open Any!	onRetainNonConfigurationInstance() Called by the system, as part of destroying an activity due to a configuration change, when it is known that a new instance will immediately be created for the new configuration.
open Unit	onSaveInstanceState(outState: Bundle, outPersistentState: PersistableBundle) This is the same as #onSaveInstanceState but is called for activities created with the attribute android.R.attr#persistableMode set to persistAcrossReboots.
open Boolean	onSearchRequested(searchEvent: SearchEvent?) This hook is called when the user signals the desire to start a search.
open Boolean	onSearchRequested()
open Unit	onStateNotSaved() Called when an onResume is coming up, prior to other pre-resume callbacks such as #onNewIntent and #onActivityResult.
open Unit	onTopResumedActivityChanged(isTopResumedActivity: Boolean) Called when activity gets or loses the top resumed position in the system.
open Boolean	onTouchEvent(event: MotionEvent!) Called when a touch screen event was not handled by any of the views inside of the activity.
open Boolean	onTrackballEvent(event: MotionEvent!) Called when the trackball was moved and not handled by any of the views inside of the activity.
open Unit	onTrimMemory(level: Int)
open Unit	onUserInteraction() Called whenever a key, touch, or trackball event is dispatched to the activity.
open Unit	onVisibleBehindCanceled() Called when a translucent activity over this activity is becoming opaque or another activity is being launched.
open Unit	onWindowAttributesChanged(params: WindowManager.LayoutParams!)
open Unit	onWindowFocusChanged(hasFocus: Boolean) Called when the current Window of the activity gains or loses focus.
open ActionMode?	onWindowStartingActionMode(callback: ActionMode.Callback!) Give the Activity a chance to control the UI for an action mode requested by the system.
open ActionMode?	onWindowStartingActionMode(callback: ActionMode.Callback!, type: Int) Called when an action mode is being started for this window.
open Unit	openContextMenu(view: View!) Programmatically opens the context menu for a particular view.
open Unit	openOptionsMenu() Programmatically opens the options menu.
open Unit	overrideActivityTransition(overrideType: Int, enterAnim: Int, exitAnim: Int) Customizes the animation for the activity transition with this activity.
open Unit	overrideActivityTransition(overrideType: Int, enterAnim: Int, exitAnim: Int, backgroundColor: Int) Customizes the animation for the activity transition with this activity.
open Unit	overridePendingTransition(enterAnim: Int, exitAnim: Int) Call immediately after one of the flavors of #startActivity(android.content.Intent) or
open Unit	overridePendingTransition(enterAnim: Int, exitAnim: Int, backgroundColor: Int) Call immediately after one of the flavors of #startActivity(android.content.Intent) or
open Unit	postponeEnterTransition() Postpone the entering activity transition when Activity was started with android.app.ActivityOptions#makeSceneTransitionAnimation(Activity, * android.util.Pair[]).
open Unit	recreate() Cause this Activity to be recreated with a new instance.
open Unit	registerActivityLifecycleCallbacks(callback: Application.ActivityLifecycleCallbacks) Register an Application.ActivityLifecycleCallbacks instance that receives lifecycle callbacks for only this Activity.
open Unit	registerComponentCallbacks(callback: ComponentCallbacks!)
open Unit	registerForContextMenu(view: View!) Registers a context menu to be shown for the given view (multiple views can show the context menu).
open Unit	registerScreenCaptureCallback(executor: Executor, callback: Activity.ScreenCaptureCallback) Registers a screen capture callback for this activity.
open Boolean	releaseInstance() Ask that the local app instance of this activity be released to free up its memory.
Unit	removeDialog(id: Int) Removes any internal references to a dialog managed by this Activity.
open Unit	reportFullyDrawn() Report to the system that your app is now fully drawn, for diagnostic and optimization purposes.
open DragAndDropPermissions!	requestDragAndDropPermissions(event: DragEvent!) Create DragAndDropPermissions object bound to this activity and controlling the access permissions for content URIs associated with the DragEvent.
open Unit	requestFullscreenMode(request: Int, approvalCallback: OutcomeReceiver<Void!, Throwable!>?) Request to put the activity into fullscreen.
Unit	requestPermissions(permissions: Array<String!>, requestCode: Int) Requests permissions to be granted to this application.
Unit	requestPermissions(permissions: Array<String!>, requestCode: Int, deviceId: Int) Requests permissions to be granted to this application.
Unit	requestShowKeyboardShortcuts() Request the Keyboard Shortcuts screen to show up.
open Boolean	requestVisibleBehind(visible: Boolean) Activities that want to remain visible behind a translucent activity above them must call this method anytime between the start of onResume() and the return from onPause().
Boolean	requestWindowFeature(featureId: Int) Enable extended window features.
T	requireViewById(id: Int) Finds a view that was identified by the android:id XML attribute that was processed in #onCreate, or throws an IllegalArgumentException if the ID is invalid, or there is no matching view in the hierarchy.
Unit	runOnUiThread(action: Runnable!) Runs the specified action on the UI thread.
open Unit	setActionBar(toolbar: Toolbar?) Set a Toolbar to act as the ActionBar for this Activity window.
open Unit	setAllowCrossUidActivitySwitchFromBelow(allowed: Boolean) Specifies whether the activities below this one in the task can also start other activities or finish the task.
open Unit	setContentTransitionManager(tm: TransitionManager!) Set the TransitionManager to use for default transitions in this window.
open Unit	setContentView(layoutResID: Int) Set the activity content from a layout resource.
open Unit	setContentView(view: View!) Set the activity content to an explicit view.
open Unit	setContentView(view: View!, params: ViewGroup.LayoutParams!) Set the activity content to an explicit view.
Unit	setDefaultKeyMode(mode: Int) Select the default key handling for this activity.
open Unit	setEnterSharedElementCallback(callback: SharedElementCallback!) When android.app.ActivityOptions#makeSceneTransitionAnimation(Activity, * android.view.View, String) was used to start an Activity, callback will be called to handle shared elements on the launched Activity.
open Unit	setExitSharedElementCallback(callback: SharedElementCallback!) When android.app.ActivityOptions#makeSceneTransitionAnimation(Activity, * android.view.View, String) was used to start an Activity, callback will be called to handle shared elements on the launching Activity.
Unit	setFeatureDrawable(featureId: Int, drawable: Drawable!) Convenience for calling android.view.Window#setFeatureDrawable(int, Drawable).
Unit	setFeatureDrawableAlpha(featureId: Int, alpha: Int) Convenience for calling android.view.Window#setFeatureDrawableAlpha.
Unit	setFeatureDrawableResource(featureId: Int, resId: Int) Convenience for calling android.view.Window#setFeatureDrawableResource.
Unit	setFeatureDrawableUri(featureId: Int, uri: Uri!) Convenience for calling android.view.Window#setFeatureDrawableUri.
open Unit	setFinishOnTouchOutside(finish: Boolean) Sets whether this activity is finished when touched outside its window's bounds.
open Unit	setImmersive(i: Boolean) Adjust the current immersive mode setting.
open Unit	setInheritShowWhenLocked(inheritShowWhenLocked: Boolean) Specifies whether this Activity should be shown on top of the lock screen whenever the lockscreen is up and this activity has another activity behind it with the showWhenLock attribute set.
open Unit	setIntent(newIntent: Intent!) Changes the intent returned by getIntent.
open Unit	setIntent(newIntent: Intent?, newCaller: ComponentCaller?) Changes the intent returned by getIntent, and ComponentCaller returned by getCaller.
open Unit	setLocusContext(locusId: LocusId?, bundle: Bundle?) Sets the android.content.LocusId for this activity.
Unit	setMediaController(controller: MediaController!) Sets a MediaController to send media keys and volume changes to.
open Unit	setPictureInPictureParams(params: PictureInPictureParams) Updates the properties of the picture-in-picture activity, or sets it to be used later when enterPictureInPictureMode() is called.
Unit	setProgress(progress: Int) Sets the progress for the progress bars in the title.
Unit	setProgressBarIndeterminate(indeterminate: Boolean) Sets whether the horizontal progress bar in the title should be indeterminate (the circular is always indeterminate).
Unit	setProgressBarIndeterminateVisibility(visible: Boolean) Sets the visibility of the indeterminate progress bar in the title.
Unit	setProgressBarVisibility(visible: Boolean) Sets the visibility of the progress bar in the title.
open Unit	setRecentsScreenshotEnabled(enabled: Boolean) If set to false, this indicates to the system that it should never take a screenshot of the activity to be used as a representation in recents screen.
open Unit	setRequestedOrientation(requestedOrientation: Int) Change the desired orientation of this activity.
Unit	setResult(resultCode: Int) Call this to set the result that your activity will return to its caller.
Unit	setResult(resultCode: Int, data: Intent!) Call this to set the result that your activity will return to its caller.
Unit	setSecondaryProgress(secondaryProgress: Int) Sets the secondary progress for the progress bar in the title.
open Unit	setShouldDockBigOverlays(shouldDockBigOverlays: Boolean) Specifies a preference to dock big overlays like the expanded picture-in-picture on TV (see PictureInPictureParams.Builder#setExpandedAspectRatio).
open Unit	setShowWhenLocked(showWhenLocked: Boolean) Specifies whether an Activity should be shown on top of the lock screen whenever the lockscreen is up and the activity is resumed.
open Unit	setTaskDescription(taskDescription: ActivityManager.TaskDescription!) Sets information describing the task with this activity for presentation inside the Recents System UI.
open Unit	setTheme(resid: Int)
open Unit	setTitle(title: CharSequence!) Change the title associated with this activity.
open Unit	setTitle(titleId: Int) Change the title associated with this activity.
open Unit	setTitleColor(textColor: Int) Change the color of the title associated with this activity.
open Boolean	setTranslucent(translucent: Boolean) Convert an activity, which particularly with android.R.attr#windowIsTranslucent or android.R.attr#windowIsFloating attribute, to a fullscreen opaque activity, or convert it from opaque back to translucent.
open Unit	setTurnScreenOn(turnScreenOn: Boolean) Specifies whether the screen should be turned on when the Activity is resumed.
open Unit	setVisible(visible: Boolean) Control whether this activity's main window is visible.
Unit	setVolumeControlStream(streamType: Int) Suggests an audio stream whose volume should be changed by the hardware volume controls.
open Unit	setVrModeEnabled(enabled: Boolean, requestedComponent: ComponentName) Enable or disable virtual reality (VR) mode for this Activity.
open Boolean	shouldDockBigOverlays() Returns whether big overlays should be docked next to the activity as set by setShouldDockBigOverlays.
open Boolean	shouldShowRequestPermissionRationale(permission: String) Gets whether you should show UI with rationale before requesting a permission.
open Boolean	shouldShowRequestPermissionRationale(permission: String, deviceId: Int) Gets whether you should show UI with rationale before requesting a permission.
open Boolean	shouldUpRecreateTask(targetIntent: Intent!) Returns true if the app should recreate the task when navigating 'up' from this activity by using targetIntent.
open Boolean	showAssist(args: Bundle!) Ask to have the current assistant shown to the user.
Unit	showDialog(id: Int) Simple version of showDialog(int,android.os.Bundle) that does not take any arguments.
Boolean	showDialog(id: Int, args: Bundle!) Show a dialog managed by this activity.
open Unit	showLockTaskEscapeMessage() Shows the user the system defined message for telling the user how to exit lock task mode.
open ActionMode?	startActionMode(callback: ActionMode.Callback!) Start an action mode of the default type ActionMode#TYPE_PRIMARY.
open ActionMode?	startActionMode(callback: ActionMode.Callback!, type: Int) Start an action mode of the given type.
open Unit	startActivities(intents: Array<Intent!>!) Same as #startActivities(android.content.Intent[],android.os.Bundle) with no options specified.
open Unit	startActivities(intents: Array<Intent!>!, options: Bundle?) Launch a new activity.
open Unit	startActivity(intent: Intent!) Same as #startActivity(android.content.Intent,android.os.Bundle) with no options specified.
open Unit	startActivity(intent: Intent!, options: Bundle?) Launch a new activity.
open Unit	startActivityForResult(intent: Intent!, requestCode: Int) Same as calling startActivityForResult(android.content.Intent,int,android.os.Bundle) with no options.
open Unit	startActivityForResult(intent: Intent!, requestCode: Int, options: Bundle?) Launch an activity for which you would like a result when it finished.
open Unit	startActivityFromChild(child: Activity, intent: Intent!, requestCode: Int) Same as calling startActivityFromChild(android.app.Activity,android.content.Intent,int,android.os.Bundle) with no options.
open Unit	startActivityFromChild(child: Activity, intent: Intent!, requestCode: Int, options: Bundle?) This is called when a child activity of this one calls its #startActivity or #startActivityForResult method.
open Unit	startActivityFromFragment(fragment: Fragment, intent: Intent!, requestCode: Int) Same as calling startActivityFromFragment(android.app.Fragment,android.content.Intent,int,android.os.Bundle) with no options.
open Unit	startActivityFromFragment(fragment: Fragment, intent: Intent!, requestCode: Int, options: Bundle?) This is called when a Fragment in this activity calls its android.
open Boolean	startActivityIfNeeded(intent: Intent, requestCode: Int) Same as calling startActivityIfNeeded(android.content.Intent,int,android.os.Bundle) with no options.
open Boolean	startActivityIfNeeded(intent: Intent, requestCode: Int, options: Bundle?) A special variation to launch an activity only if a new activity instance is needed to handle the given Intent.
open Unit	startIntentSender(intent: IntentSender!, fillInIntent: Intent?, flagsMask: Int, flagsValues: Int, extraFlags: Int) Same as calling #startIntentSender(android.content.IntentSender,android.content.Intent,int,int,int,android.os.Bundle) with no options.
open Unit	startIntentSender(intent: IntentSender!, fillInIntent: Intent?, flagsMask: Int, flagsValues: Int, extraFlags: Int, options: Bundle?) Like #startActivity(android.content.Intent,android.os.Bundle), but taking a IntentSender to start; see
open Unit	startIntentSenderForResult(intent: IntentSender!, requestCode: Int, fillInIntent: Intent?, flagsMask: Int, flagsValues: Int, extraFlags: Int) Same as calling startIntentSenderForResult(android.content.IntentSender,int,android.content.Intent,int,int,int,android.os.Bundle) with no options.
open Unit	startIntentSenderForResult(intent: IntentSender!, requestCode: Int, fillInIntent: Intent?, flagsMask: Int, flagsValues: Int, extraFlags: Int, options: Bundle?) Like startActivityForResult(android.content.Intent,int), but allowing you to use a IntentSender to describe the activity to be started.
open Unit	startIntentSenderFromChild(child: Activity!, intent: IntentSender!, requestCode: Int, fillInIntent: Intent!, flagsMask: Int, flagsValues: Int, extraFlags: Int) Same as calling startIntentSenderFromChild(android.app.Activity,android.content.IntentSender,int,android.content.Intent,int,int,int,android.os.Bundle) with no options.
open Unit	startIntentSenderFromChild(child: Activity!, intent: IntentSender!, requestCode: Int, fillInIntent: Intent!, flagsMask: Int, flagsValues: Int, extraFlags: Int, options: Bundle?) Like startActivityFromChild(android.app.Activity,android.content.Intent,int), but taking a IntentSender; see startIntentSenderForResult(android.content.IntentSender,int,android.content.Intent,int,int,int) for more information.
open Unit	startLocalVoiceInteraction(privateOptions: Bundle!) Starts a local voice interaction session.
open Unit	startLockTask() Request to put this activity in a mode where the user is locked to a restricted set of applications.
open Unit	startManagingCursor(c: Cursor!) This method allows the activity to take care of managing the given Cursor's lifecycle for you based on the activity's lifecycle.
open Boolean	startNextMatchingActivity(intent: Intent) Same as calling startNextMatchingActivity(android.content.Intent,android.os.Bundle) with no options.
open Boolean	startNextMatchingActivity(intent: Intent, options: Bundle?) Special version of starting an activity, for use when you are replacing other activity components.
open Unit	startPostponedEnterTransition() Begin postponed transitions after postponeEnterTransition() was called.
open Unit	startSearch(initialQuery: String?, selectInitialQuery: Boolean, appSearchData: Bundle?, globalSearch: Boolean) This hook is called to launch the search UI.
open Unit	stopLocalVoiceInteraction() Request to terminate the current voice interaction that was previously started using startLocalVoiceInteraction(android.os.Bundle).
open Unit	stopLockTask() Stop the current task from being locked.
open Unit	stopManagingCursor(c: Cursor!) Given a Cursor that was previously given to startManagingCursor, stop the activity's management of that cursor.
open Unit	takeKeyEvents(get: Boolean) Request that key events come to this activity.
open Unit	triggerSearch(query: String!, appSearchData: Bundle?) Similar to startSearch, but actually fires off the search query after invoking the search dialog.
open Unit	unregisterActivityLifecycleCallbacks(callback: Application.ActivityLifecycleCallbacks) Unregister an Application.ActivityLifecycleCallbacks previously registered with registerActivityLifecycleCallbacks.
open Unit	unregisterComponentCallbacks(callback: ComponentCallbacks!)
open Unit	unregisterForContextMenu(view: View!) Prevents a context menu to be shown for the given view.
open Unit	unregisterScreenCaptureCallback(callback: Activity.ScreenCaptureCallback) Unregisters a screen capture callback for this surface.

Protected methods
open Unit	attachBaseContext(newBase: Context!)
open Unit	onActivityResult(requestCode: Int, resultCode: Int, data: Intent!) Called when an activity you launched exits, giving you the requestCode you started it with, the resultCode it returned, and any additional data from it.
open Unit	onApplyThemeResource(theme: Resources.Theme!, resid: Int, first: Boolean)
open Unit	onChildTitleChanged(childActivity: Activity!, title: CharSequence!)
open Unit	onCreate(savedInstanceState: Bundle?) Called when the activity is starting.
open Dialog!	onCreateDialog(id: Int)
open Dialog?	onCreateDialog(id: Int, args: Bundle!) Callback for creating dialogs that are managed (saved and restored) for you by the activity.
open Unit	onDestroy() Perform any final cleanup before an activity is destroyed.
open Unit	onNewIntent(intent: Intent!) This is called for activities that set launchMode to "singleTop" in their package, or if a client used the Intent#FLAG_ACTIVITY_SINGLE_TOP flag when calling #startActivity.
open Unit	onPause() Called as part of the activity lifecycle when the user no longer actively interacts with the activity, but it is still visible on screen.
open Unit	onPostCreate(savedInstanceState: Bundle?) Called when activity start-up is complete (after onStart and #onRestoreInstanceState have been called).
open Unit	onPostResume() Called when activity resume is complete (after onResume has been called).
open Unit	onPrepareDialog(id: Int, dialog: Dialog!)
open Unit	onPrepareDialog(id: Int, dialog: Dialog!, args: Bundle!) Provides an opportunity to prepare a managed dialog before it is being shown.
open Unit	onRestart() Called after onStop when the current activity is being re-displayed to the user (the user has navigated back to it).
open Unit	onRestoreInstanceState(savedInstanceState: Bundle) This method is called after onStart when the activity is being re-initialized from a previously saved state, given here in savedInstanceState.
open Unit	onResume() Called after #onRestoreInstanceState, onRestart, or onPause.
open Unit	onSaveInstanceState(outState: Bundle) Called to retrieve per-instance state from an activity before being killed so that the state can be restored in #onCreate or #onRestoreInstanceState (the Bundle populated by this method will be passed to both).
open Unit	onStart() Called after #onCreate — or after onRestart when the activity had been stopped, but is now again being displayed to the user.
open Unit	onStop() Called when you are no longer visible to the user.
open Unit	onTitleChanged(title: CharSequence!, color: Int)
open Unit	onUserLeaveHint() Called as part of the activity lifecycle when an activity is about to go into the background as the result of user choice.

Inherited functions
From class ContextThemeWrapper Unit applyOverrideConfiguration(overrideConfiguration: Configuration!) Call to set an "override configuration" on this context -- this is a configuration that replies one or more values of the standard configuration that is applied to the context. See Context#createConfigurationContext(Configuration) for more information. This method can only be called once, and must be called before any calls to #getResources() or #getAssets() are made. AssetManager! getAssets() Resources! getResources() Resources.Theme! getTheme() Unit setTheme(theme: Resources.Theme?) Set the configure the current theme. If null is provided then the default Theme is returned on the next call to #getTheme()
From class ContextWrapper Boolean bindIsolatedService(service: Intent, flags: Int, instanceName: String, executor: Executor, conn: ServiceConnection) Boolean bindService(service: Intent, conn: ServiceConnection, flags: Int) Boolean bindService(service: Intent, conn: ServiceConnection, flags: Context.BindServiceFlags) See bindService(android.content.Intent,android.content.ServiceConnection,int) Call BindServiceFlags#of(long) to obtain a BindServiceFlags object. Boolean bindService(service: Intent, flags: Int, executor: Executor, conn: ServiceConnection) Boolean bindService(service: Intent, flags: Context.BindServiceFlags, executor: Executor, conn: ServiceConnection) See bindService(android.content.Intent,int,java.util.concurrent.Executor,android.content.ServiceConnection) Call BindServiceFlags#of(long) to obtain a BindServiceFlags object. Int checkCallingOrSelfPermission(permission: String) Int checkCallingOrSelfUriPermission(uri: Uri!, modeFlags: Int) IntArray checkCallingOrSelfUriPermissions(uris: MutableList<Uri!>, modeFlags: Int) Determine whether the calling process of an IPC or you has been granted permission to access a list of URIs. This is the same as checkCallingUriPermission, except it grants your own permissions if you are not currently processing an IPC. Use with care! Int checkCallingPermission(permission: String) Int checkCallingUriPermission(uri: Uri!, modeFlags: Int) IntArray checkCallingUriPermissions(uris: MutableList<Uri!>, modeFlags: Int) Determine whether the calling process and uid has been granted permission to access a list of URIs. This is basically the same as calling checkUriPermissions(java.util.List,int,int,int) with the pid and uid returned by android.os.Binder#getCallingPid and android.os.Binder#getCallingUid. One important difference is that if you are not currently processing an IPC, this function will always fail. Int checkContentUriPermissionFull(uri: Uri, pid: Int, uid: Int, modeFlags: Int) Determine whether a particular process and uid has been granted permission to access a specific content URI. Unlike checkUriPermission(android.net.Uri,int,int,int), this method checks for general access to the URI's content provider, as well as explicitly granted permissions. Note, this check will throw an IllegalArgumentException for non-content URIs. Int checkPermission(permission: String, pid: Int, uid: Int) Int checkSelfPermission(permission: String) Int checkUriPermission(uri: Uri!, pid: Int, uid: Int, modeFlags: Int) Int checkUriPermission(uri: Uri?, readPermission: String?, writePermission: String?, pid: Int, uid: Int, modeFlags: Int) Check both a Uri and normal permission. This allows you to perform both checkPermission and #checkUriPermission in one call. IntArray checkUriPermissions(uris: MutableList<Uri!>, pid: Int, uid: Int, modeFlags: Int) Determine whether a particular process and uid has been granted permission to access a list of URIs. This only checks for permissions that have been explicitly granted -- if the given process/uid has more general access to the URI's content provider then this check will always fail. Note: On SDK Version android.os.Build.VERSION_CODES#S, calling this method from a secondary-user's context will incorrectly return PackageManager#PERMISSION_DENIED for all {code uris}. Unit clearWallpaper() Context createAttributionContext(attributionTag: String?) Return a new Context object for the current Context but attribute to a different tag. In complex apps attribution tagging can be used to distinguish between separate logical parts. Context! createConfigurationContext(overrideConfiguration: Configuration) Context createContext(contextParams: ContextParams) Creates a context with specific properties and behaviors. Context createDeviceContext(deviceId: Int) Returns a new Context object from the current context but with device association given by the deviceId. Each call to this method returns a new instance of a context object. Context objects are not shared; however, common state (such as the ClassLoader and other resources for the same configuration) can be shared, so the Context itself is lightweight. Applications that run on virtual devices may use this method to access the default device capabilities and functionality (by passing Context#DEVICE_ID_DEFAULT. Similarly, applications running on the default device may access the functionality of virtual devices. Note that the newly created instance will be associated with the same display as the parent Context, regardless of the device ID passed here. Context! createDeviceProtectedStorageContext() Context! createDisplayContext(display: Display) Context! createPackageContext(packageName: String!, flags: Int) Context createWindowContext(type: Int, options: Bundle?) Creates a Context for a non-activity window. A window context is a context that can be used to add non-activity windows, such as android.view.WindowManager.LayoutParams#TYPE_APPLICATION_OVERLAY. A window context must be created from a context that has an associated Display, such as Activity or a context created with createDisplayContext(android.view.Display). The window context is created with the appropriate Configuration for the area of the display that the windows created with it can occupy; it must be used when inflating views, such that they can be inflated with proper Resources. Below is a sample code to add an application overlay window on the primary display: ... final DisplayManager dm = anyContext.getSystemService(DisplayManager.class); final Display primaryDisplay = dm.getDisplay(DEFAULT_DISPLAY); final Context windowContext = anyContext.createDisplayContext(primaryDisplay) .createWindowContext(TYPE_APPLICATION_OVERLAY, null); final View overlayView = Inflater.from(windowContext).inflate(someLayoutXml, null); // WindowManager.LayoutParams initialization ... // The types used in addView and createWindowContext must match. mParams.type = TYPE_APPLICATION_OVERLAY; ... windowContext.getSystemService(WindowManager.class).addView(overlayView, mParams); This context's configuration and resources are adjusted to an area of the display where the windows with provided type will be added. Note that all windows associated with the same context will have an affinity and can only be moved together between different displays or areas on a display. If there is a need to add different window types, or non-associated windows, separate Contexts should be used. Creating a window context is an expensive operation. Misuse of this API may lead to a huge performance drop. The best practice is to use the same window context when possible. An approach is to create one window context with specific window type and display and use it everywhere it's needed. After Build.VERSION_CODES#S, window context provides the capability to receive configuration changes for existing token by overriding the token of the android.view.WindowManager.LayoutParams passed in WindowManager#addView(View, LayoutParams). This is useful when an application needs to attach its window to an existing activity for window token sharing use-case. Note that the window context in Build.VERSION_CODES#R didn't have this capability. This is a no-op for the window context in Build.VERSION_CODES#R. Below is sample code to attach an existing token to a window context: final DisplayManager dm = anyContext.getSystemService(DisplayManager.class); final Display primaryDisplay = dm.getDisplay(DEFAULT_DISPLAY); final Context windowContext = anyContext.createWindowContext(primaryDisplay, TYPE_APPLICATION, null); // Get an existing token. final IBinder existingToken = activity.getWindow().getAttributes().token; // The types used in addView() and createWindowContext() must match. final WindowManager.LayoutParams params = new WindowManager.LayoutParams(TYPE_APPLICATION); params.token = existingToken; // After WindowManager#addView(), the server side will extract the provided token from // LayoutParams#token (existingToken in the sample code), and switch to propagate // configuration changes from the node associated with the provided token. windowContext.getSystemService(WindowManager.class).addView(overlayView, mParams); After Build.VERSION_CODES#S, window context provides the capability to listen to its Configuration changes by calling registerComponentCallbacks(android.content.ComponentCallbacks), while other kinds of Context will register the ComponentCallbacks to its. Note that window context only propagate ComponentCallbacks#onConfigurationChanged(Configuration) callback. ComponentCallbacks#onLowMemory() or other callbacks in ComponentCallbacks2 won't be invoked. Note that using android.app.Application or android.app.Service context for UI-related queries may result in layout or continuity issues on devices with variable screen sizes (e.g. foldables) or in multi-window modes, since these non-UI contexts may not reflect the Configuration changes for the visual container. Context createWindowContext(display: Display, type: Int, options: Bundle?) Creates a Context for a non-activity window on the given Display. Similar to createWindowContext(int,android.os.Bundle), but the display is passed in, instead of implicitly using the original Context's Display. Array<String!>! databaseList() Boolean deleteDatabase(name: String!) Boolean deleteFile(name: String!) Boolean deleteSharedPreferences(name: String!) Unit enforceCallingOrSelfPermission(permission: String, message: String?) If neither you nor the calling process of an IPC you are handling has been granted a particular permission, throw a SecurityException. This is the same as enforceCallingPermission, except it grants your own permissions if you are not currently processing an IPC. Use with care! Unit enforceCallingOrSelfUriPermission(uri: Uri!, modeFlags: Int, message: String!) Unit enforceCallingPermission(permission: String, message: String?) If the calling process of an IPC you are handling has not been granted a particular permission, throw a SecurityException. This is basically the same as calling enforcePermission(java.lang.String,int,int,java.lang.String) with the pid and uid returned by android.os.Binder#getCallingPid and android.os.Binder#getCallingUid. One important difference is that if you are not currently processing an IPC, this function will always throw the SecurityException. This is done to protect against accidentally leaking permissions; you can use enforceCallingOrSelfPermission to avoid this protection. Unit enforceCallingUriPermission(uri: Uri!, modeFlags: Int, message: String!) Unit enforcePermission(permission: String, pid: Int, uid: Int, message: String?) If the given permission is not allowed for a particular process and user ID running in the system, throw a SecurityException. Unit enforceUriPermission(uri: Uri!, pid: Int, uid: Int, modeFlags: Int, message: String!) Unit enforceUriPermission(uri: Uri?, readPermission: String?, writePermission: String?, pid: Int, uid: Int, modeFlags: Int, message: String?) Enforce both a Uri and normal permission. This allows you to perform both enforcePermission and #enforceUriPermission in one call. Array<String!>! fileList() Context! getApplicationContext() ApplicationInfo! getApplicationInfo() AttributionSource getAttributionSource() Context! getBaseContext() File! getCacheDir() ClassLoader! getClassLoader() File! getCodeCacheDir() ContentResolver! getContentResolver() File! getDataDir() File! getDatabasePath(name: String!) Int getDeviceId() File! getDir(name: String!, mode: Int) Display! getDisplay() Get the display this context is associated with. Applications should use this method with android.app.Activity or a context associated with a Display via createDisplayContext(android.view.Display) to get a display object associated with a Context, or android.hardware.display.DisplayManager#getDisplay to get a display object by id. File? getExternalCacheDir() Returns absolute path to application-specific directory on the primary shared/external storage device where the application can place cache files it owns. These files are internal to the application, and not typically visible to the user as media. This is like getCacheDir() in that these files will be deleted when the application is uninstalled, however there are some important differences: The platform does not always monitor the space available in shared storage, and thus may not automatically delete these files. Apps should always manage the maximum space used in this location. Currently the only time files here will be deleted by the platform is when running on android.os.Build.VERSION_CODES#JELLY_BEAN_MR1 or later and Environment#isExternalStorageEmulated(File) returns true. Shared storage may not always be available, since removable media can be ejected by the user. Media state can be checked using Environment#getExternalStorageState(File). There is no security enforced with these files. For example, any application holding android.Manifest.permission#WRITE_EXTERNAL_STORAGE can write to these files. If a shared storage device is emulated (as determined by Environment#isExternalStorageEmulated(File)), its contents are backed by a private user data partition, which means there is little benefit to storing data here instead of the private directory returned by getCacheDir(). Starting in android.os.Build.VERSION_CODES#KITKAT, no permissions are required to read or write to the returned path; it's always accessible to the calling app. This only applies to paths generated for package name of the calling application. To access paths belonging to other packages, android.Manifest.permission#WRITE_EXTERNAL_STORAGE and/or android.Manifest.permission#READ_EXTERNAL_STORAGE are required. On devices with multiple users (as described by UserManager), each user has their own isolated shared storage. Applications only have access to the shared storage for the user they're running as. The returned path may change over time if different shared storage media is inserted, so only relative paths should be persisted. Array<File!>! getExternalCacheDirs() File? getExternalFilesDir(type: String?) Returns the absolute path to the directory on the primary shared/external storage device where the application can place persistent files it owns. These files are internal to the applications, and not typically visible to the user as media. This is like getFilesDir() in that these files will be deleted when the application is uninstalled, however there are some important differences: Shared storage may not always be available, since removable media can be ejected by the user. Media state can be checked using Environment#getExternalStorageState(File). There is no security enforced with these files. For example, any application holding android.Manifest.permission#WRITE_EXTERNAL_STORAGE can write to these files. If a shared storage device is emulated (as determined by Environment#isExternalStorageEmulated(File)), its contents are backed by a private user data partition, which means there is little benefit to storing data here instead of the private directories returned by getFilesDir(), etc. Starting in android.os.Build.VERSION_CODES#KITKAT, no permissions are required to read or write to the returned path; it's always accessible to the calling app. This only applies to paths generated for package name of the calling application. To access paths belonging to other packages, android.Manifest.permission#WRITE_EXTERNAL_STORAGE and/or android.Manifest.permission#READ_EXTERNAL_STORAGE are required. On devices with multiple users (as described by UserManager), each user has their own isolated shared storage. Applications only have access to the shared storage for the user they're running as. The returned path may change over time if different shared storage media is inserted, so only relative paths should be persisted. Here is an example of typical code to manipulate a file in an application's shared storage: If you supply a non-null type to this function, the returned file will be a path to a sub-directory of the given type. Though these files are not automatically scanned by the media scanner, you can explicitly add them to the media database with MediaScannerConnection.scanFile. Note that this is not the same as Environment.getExternalStoragePublicDirectory(), which provides directories of media shared by all applications. The directories returned here are owned by the application, and their contents will be removed when the application is uninstalled. Unlike Environment.getExternalStoragePublicDirectory(), the directory returned here will be automatically created for you. Here is an example of typical code to manipulate a picture in an application's shared storage and add it to the media database: Array<File!>! getExternalFilesDirs(type: String!) Array<File!>! getExternalMediaDirs() File! getFileStreamPath(name: String!) File! getFilesDir() Executor! getMainExecutor() Looper! getMainLooper() File! getNoBackupFilesDir() File! getObbDir() Array<File!>! getObbDirs() String! getPackageCodePath() PackageManager! getPackageManager() String! getPackageName() String! getPackageResourcePath() ContextParams? getParams() Return the set of parameters which this Context was created with, if it was created via createContext(android.content.ContextParams). SharedPreferences! getSharedPreferences(name: String!, mode: Int) String? getSystemServiceName(serviceClass: Class<*>) Drawable! getWallpaper() Int getWallpaperDesiredMinimumHeight() Int getWallpaperDesiredMinimumWidth() Unit grantUriPermission(toPackage: String!, uri: Uri!, modeFlags: Int) Boolean isDeviceProtectedStorage() Boolean isRestricted() Boolean moveDatabaseFrom(sourceContext: Context!, name: String!) Boolean moveSharedPreferencesFrom(sourceContext: Context!, name: String!) FileInputStream! openFileInput(name: String!) FileOutputStream! openFileOutput(name: String!, mode: Int) SQLiteDatabase! openOrCreateDatabase(name: String!, mode: Int, factory: SQLiteDatabase.CursorFactory!) SQLiteDatabase! openOrCreateDatabase(name: String!, mode: Int, factory: SQLiteDatabase.CursorFactory!, errorHandler: DatabaseErrorHandler?) Open a new private SQLiteDatabase associated with this Context's application package. Creates the database file if it doesn't exist. Accepts input param: a concrete instance of DatabaseErrorHandler to be used to handle corruption when sqlite reports database corruption. Drawable! peekWallpaper() Unit registerComponentCallbacks(callback: ComponentCallbacks!) Add a new ComponentCallbacks to the base application of the Context, which will be called at the same times as the ComponentCallbacks methods of activities and other components are called. Note that you must be sure to use unregisterComponentCallbacks when appropriate in the future; this will not be removed for you. After Build.VERSION_CODES#TIRAMISU, the ComponentCallbacks will be registered to the base Context, and can be only used after attachBaseContext(android.content.Context). Users can still call to getApplicationContext().registerComponentCallbacks(ComponentCallbacks) to add ComponentCallbacks to the base application. Unit registerDeviceIdChangeListener(executor: Executor, listener: IntConsumer) Adds a new device ID changed listener to the Context, which will be called when the device association is changed by the system. The callback can be called when an app is moved to a different device and the Context is not explicitly associated with a specific device. When an application receives a device id update callback, this Context is guaranteed to also have an updated display ID(if any) and Configuration. Intent? registerReceiver(receiver: BroadcastReceiver?, filter: IntentFilter!) Register a BroadcastReceiver to be run in the main activity thread. The receiver will be called with any broadcast Intent that matches filter, in the main application thread. The system may broadcast Intents that are "sticky" -- these stay around after the broadcast has finished, to be sent to any later registrations. If your IntentFilter matches one of these sticky Intents, that Intent will be returned by this function and sent to your receiver as if it had just been broadcast. There may be multiple sticky Intents that match filter, in which case each of these will be sent to receiver. In this case, only one of these can be returned directly by the function; which of these that is returned is arbitrarily decided by the system. If you know the Intent your are registering for is sticky, you can supply null for your receiver. In this case, no receiver is registered -- the function simply returns the sticky Intent that matches filter. In the case of multiple matches, the same rules as described above apply. See BroadcastReceiver for more information on Intent broadcasts. As of android.os.Build.VERSION_CODES#UPSIDE_DOWN_CAKE, the system can place context-registered broadcasts in a queue while the app is in the cached state. When the app leaves the cached state, such as returning to the foreground, the system delivers any queued broadcasts. Multiple instances of certain broadcasts might be merged into one broadcast. As of android.os.Build.VERSION_CODES#ICE_CREAM_SANDWICH, receivers registered with this method will correctly respect the Intent#setPackage(String) specified for an Intent being broadcast. Prior to that, it would be ignored and delivered to all matching registered receivers. Be careful if using this for security. For apps targeting android.os.Build.VERSION_CODES#UPSIDE_DOWN_CAKE, either RECEIVER_EXPORTED or RECEIVER_NOT_EXPORTED must be specified if the receiver is not being registered for system broadcasts or a SecurityException will be thrown. See registerReceiver(android.content.BroadcastReceiver,android.content.IntentFilter,int) to register a receiver with flags. Note: this method cannot be called from a BroadcastReceiver component; that is, from a BroadcastReceiver that is declared in an application's manifest. It is okay, however, to call this method from another BroadcastReceiver that has itself been registered at run time with #registerReceiver, since the lifetime of such a registered BroadcastReceiver is tied to the object that registered it. Intent? registerReceiver(receiver: BroadcastReceiver?, filter: IntentFilter!, flags: Int) Register to receive intent broadcasts, with the receiver optionally being exposed to Instant Apps. See registerReceiver(android.content.BroadcastReceiver,android.content.IntentFilter) for more information. By default Instant Apps cannot interact with receivers in other applications, this allows you to expose a receiver that Instant Apps can interact with. See BroadcastReceiver for more information on Intent broadcasts. As of android.os.Build.VERSION_CODES#UPSIDE_DOWN_CAKE, the system can place context-registered broadcasts in a queue while the app is in the cached state. When the app leaves the cached state, such as returning to the foreground, the system delivers any queued broadcasts. Multiple instances of certain broadcasts might be merged into one broadcast. As of android.os.Build.VERSION_CODES#ICE_CREAM_SANDWICH, receivers registered with this method will correctly respect the Intent#setPackage(String) specified for an Intent being broadcast. Prior to that, it would be ignored and delivered to all matching registered receivers. Be careful if using this for security. Intent? registerReceiver(receiver: BroadcastReceiver?, filter: IntentFilter!, broadcastPermission: String?, scheduler: Handler?) Register to receive intent broadcasts, to run in the context of scheduler. See registerReceiver(android.content.BroadcastReceiver,android.content.IntentFilter) for more information. This allows you to enforce permissions on who can broadcast intents to your receiver, or have the receiver run in a different thread than the main application thread. See BroadcastReceiver for more information on Intent broadcasts. As of android.os.Build.VERSION_CODES#UPSIDE_DOWN_CAKE, the system can place context-registered broadcasts in a queue while the app is in the cached state. When the app leaves the cached state, such as returning to the foreground, the system delivers any queued broadcasts. Multiple instances of certain broadcasts might be merged into one broadcast. As of android.os.Build.VERSION_CODES#ICE_CREAM_SANDWICH, receivers registered with this method will correctly respect the Intent#setPackage(String) specified for an Intent being broadcast. Prior to that, it would be ignored and delivered to all matching registered receivers. Be careful if using this for security. For apps targeting android.os.Build.VERSION_CODES#UPSIDE_DOWN_CAKE, either RECEIVER_EXPORTED or RECEIVER_NOT_EXPORTED must be specified if the receiver is not being registered for system broadcasts or a SecurityException will be thrown. See registerReceiver(android.content.BroadcastReceiver,android.content.IntentFilter,java.lang.String,android.os.Handler,int) to register a receiver with flags. Intent? registerReceiver(receiver: BroadcastReceiver?, filter: IntentFilter!, broadcastPermission: String?, scheduler: Handler?, flags: Int) Register to receive intent broadcasts, to run in the context of scheduler. See registerReceiver(android.content.BroadcastReceiver,android.content.IntentFilter,int) and registerReceiver(android.content.BroadcastReceiver,android.content.IntentFilter,java.lang.String,android.os.Handler) for more information. See BroadcastReceiver for more information on Intent broadcasts. As of android.os.Build.VERSION_CODES#UPSIDE_DOWN_CAKE, the system can place context-registered broadcasts in a queue while the app is in the cached state. When the app leaves the cached state, such as returning to the foreground, the system delivers any queued broadcasts. Multiple instances of certain broadcasts might be merged into one broadcast. As of android.os.Build.VERSION_CODES#ICE_CREAM_SANDWICH, receivers registered with this method will correctly respect the Intent#setPackage(String) specified for an Intent being broadcast. Prior to that, it would be ignored and delivered to all matching registered receivers. Be careful if using this for security. Unit removeStickyBroadcast(intent: Intent!) Unit removeStickyBroadcastAsUser(intent: Intent!, user: UserHandle!) Unit revokeSelfPermissionsOnKill(permissions: MutableCollection<String!>) Triggers the revocation of one or more permissions for the calling package. A package is only able to revoke runtime permissions. If a permission is not currently granted, it is ignored and will not get revoked (even if later granted by the user). Ultimately, you should never make assumptions about a permission status as users may grant or revoke them at any time. Background permissions which have no corresponding foreground permission still granted once the revocation is effective will also be revoked. The revocation happens asynchronously and kills all processes running in the calling UID. It will be triggered once it is safe to do so. In particular, it will not be triggered as long as the package remains in the foreground, or has any active manifest components (e.g. when another app is accessing a content provider in the package). If you want to revoke the permissions right away, you could call System.exit() in Handler.postDelayed with a delay to allow completion of async IPC, But System.exit() could affect other apps that are accessing your app at the moment. For example, apps accessing a content provider in your app will all crash. Note that the settings UI shows a permission group as granted as long as at least one permission in the group is granted. If you want the user to observe the revocation in the settings, you should revoke every permission in the target group. To learn the current list of permissions in a group, you may use PackageManager#getGroupOfPlatformPermission(String, Executor, Consumer) and PackageManager#getPlatformPermissionsForGroup(String, Executor, Consumer). This list of permissions may evolve over time, so it is recommended to check whether it contains any permission you wish to retain before trying to revoke an entire group. Unit revokeUriPermission(uri: Uri!, modeFlags: Int) Unit revokeUriPermission(targetPackage: String!, uri: Uri!, modeFlags: Int) Unit sendBroadcast(intent: Intent!) Unit sendBroadcast(intent: Intent!, receiverPermission: String?) Broadcast the given intent to all interested BroadcastReceivers, allowing an optional required permission to be enforced. This call is asynchronous; it returns immediately, and you will continue executing while the receivers are run. No results are propagated from receivers and receivers can not abort the broadcast. If you want to allow receivers to propagate results or abort the broadcast, you must send an ordered broadcast using sendOrderedBroadcast(android.content.Intent,java.lang.String). See BroadcastReceiver for more information on Intent broadcasts. Unit sendBroadcast(intent: Intent, receiverPermission: String?, options: Bundle?) Broadcast the given intent to all interested BroadcastReceivers, allowing an optional required permission to be enforced. This call is asynchronous; it returns immediately, and you will continue executing while the receivers are run. No results are propagated from receivers and receivers can not abort the broadcast. If you want to allow receivers to propagate results or abort the broadcast, you must send an ordered broadcast using sendOrderedBroadcast(android.content.Intent,java.lang.String). See BroadcastReceiver for more information on Intent broadcasts. Unit sendBroadcastAsUser(intent: Intent!, user: UserHandle!) Unit sendBroadcastAsUser(intent: Intent!, user: UserHandle!, receiverPermission: String?) Unit sendOrderedBroadcast(intent: Intent!, receiverPermission: String?) Broadcast the given intent to all interested BroadcastReceivers, delivering them one at a time to allow more preferred receivers to consume the broadcast before it is delivered to less preferred receivers. This call is asynchronous; it returns immediately, and you will continue executing while the receivers are run. See BroadcastReceiver for more information on Intent broadcasts. Unit sendOrderedBroadcast(intent: Intent, receiverPermission: String?, options: Bundle?) Broadcast the given intent to all interested BroadcastReceivers, delivering them one at a time to allow more preferred receivers to consume the broadcast before it is delivered to less preferred receivers. This call is asynchronous; it returns immediately, and you will continue executing while the receivers are run. See BroadcastReceiver for more information on Intent broadcasts. Unit sendOrderedBroadcast(intent: Intent, receiverPermission: String?, resultReceiver: BroadcastReceiver?, scheduler: Handler?, initialCode: Int, initialData: String?, initialExtras: Bundle?) Version of sendBroadcast(android.content.Intent) that allows you to receive data back from the broadcast. This is accomplished by supplying your own BroadcastReceiver when calling, which will be treated as a final receiver at the end of the broadcast -- its BroadcastReceiver#onReceive method will be called with the result values collected from the other receivers. The broadcast will be serialized in the same way as calling sendOrderedBroadcast(android.content.Intent,java.lang.String). Like sendBroadcast(android.content.Intent), this method is asynchronous; it will return before resultReceiver.onReceive() is called. See BroadcastReceiver for more information on Intent broadcasts. Unit sendOrderedBroadcast(intent: Intent, receiverPermission: String?, options: Bundle?, resultReceiver: BroadcastReceiver?, scheduler: Handler?, initialCode: Int, initialData: String?, initialExtras: Bundle?) Version of sendBroadcast(android.content.Intent) that allows you to receive data back from the broadcast. This is accomplished by supplying your own BroadcastReceiver when calling, which will be treated as a final receiver at the end of the broadcast -- its BroadcastReceiver#onReceive method will be called with the result values collected from the other receivers. The broadcast will be serialized in the same way as calling sendOrderedBroadcast(android.content.Intent,java.lang.String). Like sendBroadcast(android.content.Intent), this method is asynchronous; it will return before resultReceiver.onReceive() is called. See BroadcastReceiver for more information on Intent broadcasts. Unit sendOrderedBroadcast(intent: Intent, receiverPermission: String?, receiverAppOp: String?, resultReceiver: BroadcastReceiver?, scheduler: Handler?, initialCode: Int, initialData: String?, initialExtras: Bundle?) Version of sendOrderedBroadcast(android.content.Intent,java.lang.String,android.content.BroadcastReceiver,android.os.Handler,int,java.lang.String,android.os.Bundle) that allows you to specify the App Op to enforce restrictions on which receivers the broadcast will be sent to. See BroadcastReceiver for more information on Intent broadcasts. Unit sendOrderedBroadcast(intent: Intent, initialCode: Int, receiverPermission: String?, receiverAppOp: String?, resultReceiver: BroadcastReceiver?, scheduler: Handler?, initialData: String?, initialExtras: Bundle?, options: Bundle?) Unit sendOrderedBroadcastAsUser(intent: Intent!, user: UserHandle!, receiverPermission: String?, resultReceiver: BroadcastReceiver?, scheduler: Handler?, initialCode: Int, initialData: String?, initialExtras: Bundle?) Version of sendOrderedBroadcast(android.content.Intent,java.lang.String,android.content.BroadcastReceiver,android.os.Handler,int,java.lang.String,android.os.Bundle) that allows you to specify the user the broadcast will be sent to. This is not available to applications that are not pre-installed on the system image. See BroadcastReceiver for more information on Intent broadcasts. Requires android.Manifest.permission.INTERACT_ACROSS_USERS Unit sendStickyBroadcast(intent: Intent!) Unit sendStickyBroadcast(intent: Intent, options: Bundle?) Perform a sendBroadcast(android.content.Intent) that is "sticky," meaning the Intent you are sending stays around after the broadcast is complete, so that others can quickly retrieve that data through the return value of registerReceiver(android.content.BroadcastReceiver,android.content.IntentFilter). In all other ways, this behaves the same as sendBroadcast(android.content.Intent). Unit sendStickyBroadcastAsUser(intent: Intent!, user: UserHandle!) Unit sendStickyOrderedBroadcast(intent: Intent!, resultReceiver: BroadcastReceiver?, scheduler: Handler?, initialCode: Int, initialData: String?, initialExtras: Bundle?) Version of #sendStickyBroadcast that allows you to receive data back from the broadcast. This is accomplished by supplying your own BroadcastReceiver when calling, which will be treated as a final receiver at the end of the broadcast -- its BroadcastReceiver#onReceive method will be called with the result values collected from the other receivers. The broadcast will be serialized in the same way as calling sendOrderedBroadcast(android.content.Intent,java.lang.String). Like sendBroadcast(android.content.Intent), this method is asynchronous; it will return before resultReceiver.onReceive() is called. Note that the sticky data stored is only the data you initially supply to the broadcast, not the result of any changes made by the receivers. See BroadcastReceiver for more information on Intent broadcasts. Requires android.Manifest.permission#BROADCAST_STICKY Unit sendStickyOrderedBroadcastAsUser(intent: Intent!, user: UserHandle!, resultReceiver: BroadcastReceiver?, scheduler: Handler?, initialCode: Int, initialData: String?, initialExtras: Bundle?) Version of sendStickyOrderedBroadcast(android.content.Intent,android.content.BroadcastReceiver,android.os.Handler,int,java.lang.String,android.os.Bundle) that allows you to specify the user the broadcast will be sent to. This is not available to applications that are not pre-installed on the system image. See BroadcastReceiver for more information on Intent broadcasts. Requires android.Manifest.permission.INTERACT_ACROSS_USERS and android.Manifest.permission#BROADCAST_STICKY Unit setWallpaper(bitmap: Bitmap!) Unit setWallpaper(data: InputStream!) Unit startActivities(intents: Array<Intent!>!) Unit startActivities(intents: Array<Intent!>!, options: Bundle?) Launch multiple new activities. This is generally the same as calling startActivity(android.content.Intent) for the first Intent in the array, that activity during its creation calling startActivity(android.content.Intent) for the second entry, etc. Note that unlike that approach, generally none of the activities except the last in the array will be created at this point, but rather will be created when the user first visits them (due to pressing back from the activity on top). This method throws ActivityNotFoundException if there was no Activity found for any given Intent. In this case the state of the activity stack is undefined (some Intents in the list may be on it, some not), so you probably want to avoid such situations. Unit startActivity(intent: Intent!) Unit startActivity(intent: Intent!, options: Bundle?) Launch a new activity. You will not receive any information about when the activity exits. Note that if this method is being called from outside of an android.app.Activity Context, then the Intent must include the Intent#FLAG_ACTIVITY_NEW_TASK launch flag. This is because, without being started from an existing Activity, there is no existing task in which to place the new activity and thus it needs to be placed in its own separate task. This method throws ActivityNotFoundException if there was no Activity found to run the given Intent. ComponentName? startForegroundService(service: Intent!) Similar to startService(android.content.Intent), but with an implicit promise that the Service will call startForeground(int, android.app.Notification) once it begins running. The service is given an amount of time comparable to the ANR interval to do this, otherwise the system will automatically crash the process, in which case an internal exception ForegroundServiceDidNotStartInTimeException is logged on logcat on devices running SDK Version android.os.Build.VERSION_CODES#S or later. On older Android versions, an internal exception RemoteServiceException is logged instead, with a corresponding message. Unlike the ordinary startService(android.content.Intent), this method can be used at any time, regardless of whether the app hosting the service is in a foreground state. Note: Beginning with SDK Version android.os.Build.VERSION_CODES#S, apps targeting SDK Version android.os.Build.VERSION_CODES#S or higher are not allowed to start foreground services from the background. See Behavior changes: Apps targeting Android 12 for more details. Boolean startInstrumentation(className: ComponentName, profileFile: String?, arguments: Bundle?) Start executing an android.app.Instrumentation class. The given Instrumentation component will be run by killing its target application (if currently running), starting the target process, instantiating the instrumentation component, and then letting it drive the application. This function is not synchronous -- it returns as soon as the instrumentation has started and while it is running. Instrumentation is normally only allowed to run against a package that is either unsigned or signed with a signature that the the instrumentation package is also signed with (ensuring the target trusts the instrumentation). Unit startIntentSender(intent: IntentSender!, fillInIntent: Intent?, flagsMask: Int, flagsValues: Int, extraFlags: Int) Same as startIntentSender(android.content.IntentSender,android.content.Intent,int,int,int,android.os.Bundle) with no options specified. Unit startIntentSender(intent: IntentSender!, fillInIntent: Intent?, flagsMask: Int, flagsValues: Int, extraFlags: Int, options: Bundle?) Like startActivity(android.content.Intent,android.os.Bundle), but taking a IntentSender to start. If the IntentSender is for an activity, that activity will be started as if you had called the regular startActivity(android.content.Intent) here; otherwise, its associated action will be executed (such as sending a broadcast) as if you had called android.content.IntentSender#sendIntent on it. ComponentName? startService(service: Intent!) Request that a given application service be started. The Intent should either contain the complete class name of a specific service implementation to start, or a specific package name to target. If the Intent is less specified, it logs a warning about this. In this case any of the multiple matching services may be used. If this service is not already running, it will be instantiated and started (creating a process for it if needed); if it is running then it remains running. Every call to this method will result in a corresponding call to the target service's android.app.Service#onStartCommand method, with the intent given here. This provides a convenient way to submit jobs to a service without having to bind and call on to its interface. Using startService() overrides the default service lifetime that is managed by #bindService: it requires the service to remain running until stopService is called, regardless of whether any clients are connected to it. Note that calls to startService() do not nest: no matter how many times you call startService(), a single call to stopService will stop it. The system attempts to keep running services around as much as possible. The only time they should be stopped is if the current foreground application is using so many resources that the service needs to be killed. If any errors happen in the service's process, it will automatically be restarted. This function will throw SecurityException if you do not have permission to start the given service. Note: Each call to startService() results in significant work done by the system to manage service lifecycle surrounding the processing of the intent, which can take multiple milliseconds of CPU time. Due to this cost, startService() should not be used for frequent intent delivery to a service, and only for scheduling significant work. Use #bindService for high frequency calls. Beginning with SDK Version android.os.Build.VERSION_CODES#O, apps targeting SDK Version android.os.Build.VERSION_CODES#O or higher are not allowed to start background services from the background. See Background Execution Limits for more details. Note: Beginning with SDK Version android.os.Build.VERSION_CODES#S, apps targeting SDK Version android.os.Build.VERSION_CODES#S or higher are not allowed to start foreground services from the background. See Behavior changes: Apps targeting Android 12 for more details. Boolean stopService(name: Intent!) Unit unbindService(conn: ServiceConnection) Unit unregisterComponentCallbacks(callback: ComponentCallbacks!) Remove a ComponentCallbacks object that was previously registered with registerComponentCallbacks(android.content.ComponentCallbacks). After Build.VERSION_CODES#TIRAMISU, the ComponentCallbacks will be unregistered to the base Context, and can be only used after attachBaseContext(android.content.Context) Unit unregisterDeviceIdChangeListener(listener: IntConsumer) Removes a device ID changed listener from the Context. It's a no-op if the listener is not already registered. Unit unregisterReceiver(receiver: BroadcastReceiver!) Unit updateServiceGroup(conn: ServiceConnection, group: Int, importance: Int)
From class Context Boolean bindIsolatedService(service: Intent, flags: Context.BindServiceFlags, instanceName: String, executor: Executor, conn: ServiceConnection) See bindIsolatedService(android.content.Intent,int,java.lang.String,java.util.concurrent.Executor,android.content.ServiceConnection) Call BindServiceFlags#of(long) to obtain a BindServiceFlags object. Int getColor(id: Int) Returns a color associated with a particular resource ID and styled for the current theme. ColorStateList getColorStateList(id: Int) Returns a color state list associated with a particular resource ID and styled for the current theme. Drawable? getDrawable(id: Int) Returns a drawable object associated with a particular resource ID and styled for the current theme. String getString(resId: Int) Returns a localized string from the application's package's default string table. String getString(resId: Int, vararg formatArgs: Any!) Returns a localized formatted string from the application's package's default string table, substituting the format arguments as defined in java.util.Formatter and java.lang.String#format. T getSystemService(serviceClass: Class<T>) Return the handle to a system-level service by class. Currently available classes are: android.view.WindowManager, android.view.LayoutInflater, android.app.ActivityManager, android.os.PowerManager, android.app.AlarmManager, android.app.NotificationManager, android.app.KeyguardManager, android.location.LocationManager, android.app.SearchManager, android.os.Vibrator, android.net.ConnectivityManager, android.net.wifi.WifiManager, android.media.AudioManager, android.media.MediaRouter, android.telephony.TelephonyManager, android.telephony.SubscriptionManager, android.view.inputmethod.InputMethodManager, android.app.UiModeManager, android.app.DownloadManager, android.os.BatteryManager, android.app.job.JobScheduler, android.app.usage.NetworkStatsManager, android.content.pm.verify.domain.DomainVerificationManager, android.view.displayhash.DisplayHashManager. Note: System services obtained via this API may be closely associated with the Context in which they are obtained from. In general, do not share the service objects between various different contexts (Activities, Applications, Services, Providers, etc.) Note: Instant apps, for which PackageManager#isInstantApp() returns true, don't have access to the following system services: DEVICE_POLICY_SERVICE, FINGERPRINT_SERVICE, KEYGUARD_SERVICE, SHORTCUT_SERVICE, USB_SERVICE, WALLPAPER_SERVICE, WIFI_P2P_SERVICE, WIFI_SERVICE, WIFI_AWARE_SERVICE. For these services this method will return null. Generally, if you are running as an instant app you should always check whether the result of this method is null. CharSequence getText(resId: Int) Return a localized, styled CharSequence from the application's package's default string table. TypedArray obtainStyledAttributes(attrs: IntArray) Retrieve styled attribute information in this Context's theme. See android.content.res.Resources.Theme#obtainStyledAttributes(int[]) for more information. TypedArray obtainStyledAttributes(resid: Int, attrs: IntArray) Retrieve styled attribute information in this Context's theme. See android.content.res.Resources.Theme#obtainStyledAttributes(int, int[]) for more information. TypedArray obtainStyledAttributes(set: AttributeSet?, attrs: IntArray) Retrieve styled attribute information in this Context's theme. See android.content.res.Resources.Theme#obtainStyledAttributes(AttributeSet, int[], int, int) for more information. TypedArray obtainStyledAttributes(set: AttributeSet?, attrs: IntArray, defStyleAttr: Int, defStyleRes: Int) Retrieve styled attribute information in this Context's theme. See android.content.res.Resources.Theme#obtainStyledAttributes(AttributeSet, int[], int, int) for more information. Unit revokeSelfPermissionOnKill(permName: String) Triggers the asynchronous revocation of a runtime permission. If the permission is not currently granted, nothing happens (even if later granted by the user). Unit sendBroadcastWithMultiplePermissions(intent: Intent, receiverPermissions: Array<String!>) Broadcast the given intent to all interested BroadcastReceivers, allowing an array of required permissions to be enforced. This call is asynchronous; it returns immediately, and you will continue executing while the receivers are run. No results are propagated from receivers and receivers can not abort the broadcast. If you want to allow receivers to propagate results or abort the broadcast, you must send an ordered broadcast using sendOrderedBroadcast(android.content.Intent,java.lang.String). See BroadcastReceiver for more information on Intent broadcasts.
From class ComponentCallbacks Unit onConfigurationChanged(newConfig: Configuration) Called by the system when the device configuration changes while your component is running. Note that, unlike activities, other components are never restarted when a configuration changes: they must always deal with the results of the change, such as by re-retrieving resources. At the time that this function has been called, your Resources object will have been updated to return resource values matching the new configuration. For more information, read Handling Runtime Changes. Unit onLowMemory() This is called when the overall system is running low on memory, and actively running processes should trim their memory usage. While the exact point at which this will be called is not defined, generally it will happen when all background process have been killed. That is, before reaching the point of killing processes hosting service and foreground UI that we would like to avoid killing.
From class Callback Unit onPointerCaptureChanged(hasCapture: Boolean) Called when pointer capture is enabled or disabled for the current window.

Properties
static IntArray!	FOCUSED_STATE_SET

Constants

DEFAULT_KEYS_DIALER

Added in API level 1

static val DEFAULT_KEYS_DIALER: Int

Use with setDefaultKeyMode to launch the dialer during default key handling.

Value: 1

See Also

• #setDefaultKeyMode

DEFAULT_KEYS_DISABLE

Added in API level 1

static val DEFAULT_KEYS_DISABLE: Int

Use with setDefaultKeyMode to turn off default handling of keys.

Value: 0

See Also

• #setDefaultKeyMode

DEFAULT_KEYS_SEARCH_GLOBAL

Added in API level 1

static val DEFAULT_KEYS_SEARCH_GLOBAL: Int

Use with setDefaultKeyMode to specify that unhandled keystrokes will start a global search (typically web search, but some platforms may define alternate methods for global search)

See android.app.SearchManager for more details.

Value: 4

See Also

• #setDefaultKeyMode

DEFAULT_KEYS_SEARCH_LOCAL

Added in API level 1

static val DEFAULT_KEYS_SEARCH_LOCAL: Int

Use with setDefaultKeyMode to specify that unhandled keystrokes will start an application-defined search. (If the application or activity does not actually define a search, the keys will be ignored.)

See android.app.SearchManager for more details.

Value: 3

See Also

• #setDefaultKeyMode

DEFAULT_KEYS_SHORTCUT

Added in API level 1

static val DEFAULT_KEYS_SHORTCUT: Int

Use with setDefaultKeyMode to execute a menu shortcut in default key handling.

That is, the user does not need to hold down the menu key to execute menu shortcuts.

Value: 2

See Also

• #setDefaultKeyMode

FULLSCREEN_MODE_REQUEST_ENTER

Added in API level 34

static val FULLSCREEN_MODE_REQUEST_ENTER: Int

Request type of requestFullscreenMode(int,android.os.OutcomeReceiver), to request enter fullscreen mode from multi-window mode.

Value: 1

FULLSCREEN_MODE_REQUEST_EXIT

Added in API level 34

static val FULLSCREEN_MODE_REQUEST_EXIT: Int

Request type of requestFullscreenMode(int,android.os.OutcomeReceiver), to request exiting the requested fullscreen mode and restore to the previous multi-window mode.

Value: 0

OVERRIDE_TRANSITION_CLOSE

Added in API level 34

static val OVERRIDE_TRANSITION_CLOSE: Int

Request type of overrideActivityTransition(int,int,int) or overrideActivityTransition(int,int,int,int), to override the closing transition.

Value: 1

OVERRIDE_TRANSITION_OPEN

Added in API level 34

static val OVERRIDE_TRANSITION_OPEN: Int

Request type of overrideActivityTransition(int,int,int) or overrideActivityTransition(int,int,int,int), to override the opening transition.

Value: 0

RESULT_CANCELED

Added in API level 1

static val RESULT_CANCELED: Int

Standard activity result: operation canceled.

Value: 0

RESULT_FIRST_USER

Added in API level 1

static val RESULT_FIRST_USER: Int

Start of user-defined activity results.

Value: 1

RESULT_OK

Added in API level 1

static val RESULT_OK: Int

Standard activity result: operation succeeded.

Value: -1

Public constructors

Activity

Activity()

Public methods

addContentView

Added in API level 1

open fun addContentView(
    view: View!, 
    params: ViewGroup.LayoutParams!
): Unit

Add an additional content view to the activity. Added after any existing ones in the activity -- existing views are NOT removed.

Parameters
view	View!: The desired content to display.
params	ViewGroup.LayoutParams!: Layout parameters for the view.

clearOverrideActivityTransition

Added in API level 34

open fun clearOverrideActivityTransition(overrideType: Int): Unit

Clears the animations which are set from #overrideActivityTransition.

Parameters
overrideType	Int: OVERRIDE_TRANSITION_OPEN clear the animation set for starting a new activity. OVERRIDE_TRANSITION_CLOSE clear the animation set for finishing an activity. Value is android.app.Activity#OVERRIDE_TRANSITION_OPEN, or android.app.Activity#OVERRIDE_TRANSITION_CLOSE

See Also

• #overrideActivityTransition(int, int, int)
• #overrideActivityTransition(int, int, int, int)

closeContextMenu

Added in API level 3

open fun closeContextMenu(): Unit

Programmatically closes the most recently opened context menu, if showing.

closeOptionsMenu

Added in API level 1

open fun closeOptionsMenu(): Unit

Progammatically closes the options menu. If the options menu is already closed, this method does nothing.

createPendingResult

Added in API level 1

open fun createPendingResult(
    requestCode: Int, 
    data: Intent, 
    flags: Int
): PendingIntent!

Create a new PendingIntent object which you can hand to others for them to use to send result data back to your #onActivityResult callback. The created object will be either one-shot (becoming invalid after a result is sent back) or multiple (allowing any number of results to be sent through it).

Parameters
requestCode	Int: Private request code for the sender that will be associated with the result data when it is returned. The sender can not modify this value, allowing you to identify incoming results.
data	Intent: Default data to supply in the result, which may be modified by the sender. This value cannot be null.
flags	Int: May be PendingIntent.FLAG_ONE_SHOT, PendingIntent.FLAG_NO_CREATE, PendingIntent.FLAG_CANCEL_CURRENT, PendingIntent.FLAG_UPDATE_CURRENT, or any of the flags as supported by Intent.fillIn() to control which unspecified parts of the intent that can be supplied when the actual send happens. Value is either 0 or a combination of android.app.PendingIntent#FLAG_ONE_SHOT, android.app.PendingIntent#FLAG_NO_CREATE, android.app.PendingIntent#FLAG_CANCEL_CURRENT, android.app.PendingIntent#FLAG_UPDATE_CURRENT, android.app.PendingIntent#FLAG_IMMUTABLE, android.app.PendingIntent#FLAG_MUTABLE, android.app.PendingIntent.FLAG_MUTABLE_UNAUDITED, android.app.PendingIntent#FLAG_ALLOW_UNSAFE_IMPLICIT_INTENT, android.content.Intent#FILL_IN_ACTION, android.content.Intent#FILL_IN_DATA, android.content.Intent#FILL_IN_CATEGORIES, android.content.Intent#FILL_IN_COMPONENT, android.content.Intent#FILL_IN_PACKAGE, android.content.Intent#FILL_IN_SOURCE_BOUNDS, android.content.Intent#FILL_IN_SELECTOR, and android.content.Intent#FILL_IN_CLIP_DATA

Return
PendingIntent!	Returns an existing or new PendingIntent matching the given parameters. May return null only if PendingIntent.FLAG_NO_CREATE has been supplied.

See Also

• android.app.PendingIntent

dismissDialog

Added in API level 1
Deprecated in API level 15

fun dismissDialog(id: Int): Unit

Deprecated: Use the new DialogFragment class with FragmentManager instead; this is also available on older platforms through the Android compatibility package.

Dismiss a dialog that was previously shown via showDialog(int).

Parameters
id	Int: The id of the managed dialog.

Exceptions
java.lang.IllegalArgumentException	if the id was not previously shown via showDialog(int).

See Also

• #onCreateDialog(int, Bundle)
• #onPrepareDialog(int, Dialog, Bundle)
• #showDialog(int)
• #removeDialog(int)

dismissKeyboardShortcutsHelper

Added in API level 24

fun dismissKeyboardShortcutsHelper(): Unit

Dismiss the Keyboard Shortcuts screen.

dispatchGenericMotionEvent

Added in API level 12

open fun dispatchGenericMotionEvent(ev: MotionEvent!): Boolean

Called to process generic motion events. You can override this to intercept all generic motion events before they are dispatched to the window. Be sure to call this implementation for generic motion events that should be handled normally.

Parameters
event	The generic motion event.
ev	MotionEvent!: The generic motion event.

Return
Boolean	boolean Return true if this event was consumed.

See Also

• #onGenericMotionEvent(MotionEvent)

dispatchKeyEvent

Added in API level 1

open fun dispatchKeyEvent(event: KeyEvent!): Boolean

Called to process key events. You can override this to intercept all key events before they are dispatched to the window. Be sure to call this implementation for key events that should be handled normally.

Parameters
event	KeyEvent!: The key event.

Return
Boolean	boolean Return true if this event was consumed.

dispatchKeyShortcutEvent

Added in API level 11

open fun dispatchKeyShortcutEvent(event: KeyEvent!): Boolean

Called to process a key shortcut event. You can override this to intercept all key shortcut events before they are dispatched to the window. Be sure to call this implementation for key shortcut events that should be handled normally.

Parameters
event	KeyEvent!: The key shortcut event.

Return
Boolean	True if this event was consumed.

dispatchPopulateAccessibilityEvent

Added in API level 4

open fun dispatchPopulateAccessibilityEvent(event: AccessibilityEvent!): Boolean

Parameters
event	AccessibilityEvent!: The event.

Return
Boolean	boolean Return true if event population was completed.

dispatchTouchEvent

Added in API level 1

open fun dispatchTouchEvent(ev: MotionEvent!): Boolean

Called to process touch screen events. You can override this to intercept all touch screen events before they are dispatched to the window. Be sure to call this implementation for touch screen events that should be handled normally.

Parameters
event	The touch screen event.
ev	MotionEvent!: The touch screen event.

Return
Boolean	boolean Return true if this event was consumed.

See Also

• #onTouchEvent(MotionEvent)

dispatchTrackballEvent

Added in API level 1

open fun dispatchTrackballEvent(ev: MotionEvent!): Boolean

Called to process trackball events. You can override this to intercept all trackball events before they are dispatched to the window. Be sure to call this implementation for trackball events that should be handled normally.

Parameters
event	The trackball event.
ev	MotionEvent!: The trackball event.

Return
Boolean	boolean Return true if this event was consumed.

See Also

• #onTrackballEvent(MotionEvent)

dump

Added in API level 11

open fun dump(
    prefix: String, 
    fd: FileDescriptor?, 
    writer: PrintWriter, 
    args: Array<String!>?
): Unit

Print the Activity's state into the given stream. This gets invoked if you run adb shell dumpsys activity <activity_component_name>.

This method won't be called if the app targets android.os.Build.VERSION_CODES#TIRAMISU or later if the dump request starts with one of the following arguments:

• --autofill
• --contentcapture
• --translation
• --list-dumpables
• --dump-dumpable

Parameters
prefix	String: Desired prefix to prepend at each line of output. This value cannot be null.
fd	FileDescriptor?: The raw file descriptor that the dump is being sent to. This value may be null.
writer	PrintWriter: The PrintWriter to which you should dump your state. This will be closed for you after you return. This value cannot be null.
args	Array<String!>?: additional arguments to the dump request. This value may be null.

enterPictureInPictureMode

Added in API level 24
Deprecated in API level 26

open fun enterPictureInPictureMode(): Unit

Deprecated: Deprecated in Java.

Puts the activity in picture-in-picture mode if possible in the current system state. Any prior calls to setPictureInPictureParams(android.app.PictureInPictureParams) will still apply when entering picture-in-picture through this call.

See Also

• #enterPictureInPictureMode(PictureInPictureParams)
• android.R.attr#supportsPictureInPicture

enterPictureInPictureMode

Added in API level 26

open fun enterPictureInPictureMode(params: PictureInPictureParams): Boolean

Puts the activity in picture-in-picture mode if possible in the current system state. The set parameters in {@param params} will be combined with the parameters from prior calls to setPictureInPictureParams(android.app.PictureInPictureParams). The system may disallow entering picture-in-picture in various cases, including when the activity is not visible, if the screen is locked or if the user has an activity pinned.

By default, system calculates the dimension of picture-in-picture window based on the given {@param params}. See Picture-in-picture Support on how to override this behavior.

Parameters
params	PictureInPictureParams: non-null parameters to be combined with previously set parameters when entering picture-in-picture.

Return
Boolean	true if the system successfully put this activity into picture-in-picture mode or was already in picture-in-picture mode (see isInPictureInPictureMode()). If the device does not support picture-in-picture, return false.

See Also

• android.R.attr#supportsPictureInPicture
• android.app.PictureInPictureParams

findViewById

Added in API level 1

open fun <T : View!> findViewById(id: Int): T

Finds a view that was identified by the android:id XML attribute that was processed in #onCreate.

Note: In most cases -- depending on compiler support -- the resulting view is automatically cast to the target class type. If the target class type is unconstrained, an explicit cast may be necessary.

Parameters
id	Int: the ID to search for

Return
T	a view with given ID if found, or null otherwise

See Also

• android.view.View#findViewById(int)
• android.app.Activity#requireViewById(int)

finish

Added in API level 1

open fun finish(): Unit

Call this when your activity is done and should be closed. The ActivityResult is propagated back to whoever launched you via onActivityResult().

finishActivity

Added in API level 1

open fun finishActivity(requestCode: Int): Unit

Force finish another activity that you had previously started with #startActivityForResult.

Parameters
requestCode	Int: The request code of the activity that you had given to startActivityForResult(). If there are multiple activities started with this request code, they will all be finished.

finishActivityFromChild

Added in API level 1
Deprecated in API level 30

open fun finishActivityFromChild(
    child: Activity, 
    requestCode: Int
): Unit

Deprecated: Use finishActivity(int) instead.

This is called when a child activity of this one calls its finishActivity().

Parameters
child	Activity: The activity making the call. This value cannot be null.
requestCode	Int: Request code that had been used to start the activity.

finishAffinity

Added in API level 16

open fun finishAffinity(): Unit

Finish this activity as well as all activities immediately below it in the current task that have the same affinity. This is typically used when an application can be launched on to another task (such as from an ACTION_VIEW of a content type it understands) and the user has used the up navigation to switch out of the current task and in to its own task. In this case, if the user has navigated down into any other activities of the second application, all of those should be removed from the original task as part of the task switch.

Note that this finish does not allow you to deliver results to the previous activity, and an exception will be thrown if you are trying to do so.

finishAfterTransition

Added in API level 21

open fun finishAfterTransition(): Unit

Reverses the Activity Scene entry Transition and triggers the calling Activity to reverse its exit Transition. When the exit Transition completes, finish() is called. If no entry Transition was used, finish() is called immediately and the Activity exit Transition is run.

See Also

• android.app.ActivityOptions#makeSceneTransitionAnimation(Activity, android.util.Pair[])

finishAndRemoveTask

Added in API level 21

open fun finishAndRemoveTask(): Unit

Call this when your activity is done and should be closed and the task should be completely removed as a part of finishing the root activity of the task.

finishFromChild

Added in API level 1
Deprecated in API level 30

open fun finishFromChild(child: Activity!): Unit

Deprecated: Use finish() instead.

This is called when a child activity of this one calls its finish method. The default implementation simply calls finish() on this activity (the parent), finishing the entire group.

Parameters
child	Activity!: The activity making the call.

See Also

• #finish

getActionBar

Added in API level 11

open fun getActionBar(): ActionBar?

Retrieve a reference to this activity's ActionBar.

Return
ActionBar?	The Activity's ActionBar, or null if it does not have one.

getApplication

Added in API level 1

fun getApplication(): Application!

Return the application that owns this activity.

getCaller

Added in API level 35

open fun getCaller(): ComponentCaller?

Returns the ComponentCaller instance of the app that started this activity.

To keep the ComponentCaller instance for future use, call setIntent(android.content.Intent,android.app.ComponentCaller), and use this method to retrieve it.

Note that in #onNewIntent, this method will return the original ComponentCaller. You can use setIntent(android.content.Intent,android.app.ComponentCaller) to update it to the new ComponentCaller.

Return
ComponentCaller?	ComponentCaller instance corresponding to the intent from getIntent(), or null if the activity was not launched with that intent

See Also

• android.app.ComponentCaller
• #getIntent
• #setIntent(Intent, ComponentCaller)

getCallingActivity

Added in API level 1

open fun getCallingActivity(): ComponentName?

Return the name of the activity that invoked this activity. This is who the data in #setResult will be sent to. You can use this information to validate that the recipient is allowed to receive the data.

Note: if the calling activity is not expecting a result (that is it did not use the #startActivityForResult form that includes a request code), then the calling package will be null.

Return
ComponentName?	The ComponentName of the activity that will receive your reply, or null if none.

getCallingPackage

Added in API level 1

open fun getCallingPackage(): String?

Return the name of the package that invoked this activity. This is who the data in #setResult will be sent to. You can use this information to validate that the recipient is allowed to receive the data.

Note: if the calling activity is not expecting a result (that is it did not use the #startActivityForResult form that includes a request code), then the calling package will be null.

Note: prior to android.os.Build.VERSION_CODES#JELLY_BEAN_MR2, the result from this method was unstable. If the process hosting the calling package was no longer running, it would return null instead of the proper package name. You can use getCallingActivity() and retrieve the package name from that instead.

Return
String?	The package of the activity that will receive your reply, or null if none.

getChangingConfigurations

Added in API level 1

open fun getChangingConfigurations(): Int

If this activity is being destroyed because it can not handle a configuration parameter being changed (and thus its onConfigurationChanged(android.content.res.Configuration) method is not being called), then you can use this method to discover the set of changes that have occurred while in the process of being destroyed. Note that there is no guarantee that these will be accurate (other changes could have happened at any time), so you should only use this as an optimization hint.

Return
Int	Returns a bit field of the configuration parameters that are changing, as defined by the android.content.res.Configuration class.

getComponentName

Added in API level 1

open fun getComponentName(): ComponentName!

Returns the complete component name of this activity.

Return
ComponentName!	Returns the complete component name for this activity

getContentScene

Added in API level 21

open fun getContentScene(): Scene!

Retrieve the Scene representing this window's current content. Requires Window#FEATURE_CONTENT_TRANSITIONS.

This method will return null if the current content is not represented by a Scene.

Return
Scene!	Current Scene being shown or null

getContentTransitionManager

Added in API level 21

open fun getContentTransitionManager(): TransitionManager!

Retrieve the TransitionManager responsible for default transitions in this window. Requires Window#FEATURE_CONTENT_TRANSITIONS.

This method will return non-null after content has been initialized (e.g. by using #setContentView) if Window#FEATURE_CONTENT_TRANSITIONS has been granted.

Return
TransitionManager!	This window's content TransitionManager or null if none is set.

getCurrentCaller

Added in API level 35

open fun getCurrentCaller(): ComponentCaller

Returns the ComponentCaller instance of the app that re-launched this activity with a new intent via #onNewIntent or #onActivityResult.

Note that this method only works within the #onNewIntent and #onActivityResult methods. If you call this method outside #onNewIntent and #onActivityResult, it will throw an IllegalStateException.

You can also retrieve the caller if you override onNewIntent(android.content.Intent,android.app.ComponentCaller) or onActivityResult(int,int,android.content.Intent,android.app.ComponentCaller).

To keep the ComponentCaller instance for future use, call setIntent(android.content.Intent,android.app.ComponentCaller), and use getCaller to retrieve it.

Return
ComponentCaller	ComponentCaller instance This value cannot be null.

Exceptions
java.lang.IllegalStateException	if the caller is null, indicating the method was called outside #onNewIntent

See Also

• android.app.ComponentCaller
• #setIntent(Intent, ComponentCaller)
• #getCaller

getCurrentFocus

Added in API level 1

open fun getCurrentFocus(): View?

Calls android.view.Window#getCurrentFocus on the Window of this Activity to return the currently focused view.

Return
View?	View The current View with focus or null.

See Also

• #getWindow
• android.view.Window#getCurrentFocus

getFragmentManager

Added in API level 11
Deprecated in API level 28

open fun getFragmentManager(): FragmentManager!

Deprecated: Use androidx.fragment.app.FragmentActivity#getSupportFragmentManager()

Return the FragmentManager for interacting with fragments associated with this activity.

getInitialCaller

Added in API level 35

open fun getInitialCaller(): ComponentCaller

Returns the ComponentCaller instance of the app that initially launched this activity.

Note that calls to #onNewIntent and #setIntent have no effect on the returned value of this method.

Return
ComponentCaller	ComponentCaller instance This value cannot be null.

See Also

• android.app.ComponentCaller

getIntent

Added in API level 1

open fun getIntent(): Intent!

Returns the intent that started this activity.

To keep the Intent instance for future use, call setIntent(android.content.Intent), and use this method to retrieve it.

Note that in #onNewIntent, this method will return the original Intent. You can use setIntent(android.content.Intent) to update it to the new Intent.

Return
Intent!	Intent instance that started this activity, or that was kept for future use

getLastNonConfigurationInstance

Added in API level 1

open fun getLastNonConfigurationInstance(): Any?

Retrieve the non-configuration instance data that was previously returned by onRetainNonConfigurationInstance(). This will be available from the initial #onCreate and onStart calls to the new instance, allowing you to extract any useful dynamic state from the previous instance.

Note that the data you retrieve here should only be used as an optimization for handling configuration changes. You should always be able to handle getting a null pointer back, and an activity must still be able to restore itself to its previous state (through the normal onSaveInstanceState(android.os.Bundle) mechanism) even if this function returns null.

Note: For most cases you should use the Fragment API Fragment#setRetainInstance(boolean) instead; this is also available on older platforms through the Android support libraries.

Return
Any?	the object previously returned by onRetainNonConfigurationInstance()

getLaunchedFromPackage

Added in API level 34

open fun getLaunchedFromPackage(): String?

Returns the package name of the app that initially launched this activity.

In order to receive the launching app's package name, at least one of the following has to be met:

• The app must call ActivityOptions#setShareIdentityEnabled(boolean) with a value of true and launch this activity with the resulting ActivityOptions.
• The launched activity has the same uid as the launching app.
• The launched activity is running in a package that is signed with the same key used to sign the platform (typically only system packages such as Settings will meet this requirement).

. These are the same requirements for getLaunchedFromUid(); if any of these are met, then these methods can be used to obtain the uid and package name of the launching app. If none are met, then null is returned.

Note, even if the above conditions are not met, the launching app's identity may still be available from getCallingPackage() if this activity was started with Activity#startActivityForResult to allow validation of the result's recipient.

Return
String?	the package name of the launching app or null if the current activity cannot access the identity of the launching app

See Also

• android.app.ActivityOptions#setShareIdentityEnabled(boolean)
• #getLaunchedFromUid()

getLaunchedFromUid

Added in API level 34

open fun getLaunchedFromUid(): Int

Returns the uid of the app that initially launched this activity.

In order to receive the launching app's uid, at least one of the following has to be met:

• The app must call ActivityOptions#setShareIdentityEnabled(boolean) with a value of true and launch this activity with the resulting ActivityOptions.
• The launched activity has the same uid as the launching app.
• The launched activity is running in a package that is signed with the same key used to sign the platform (typically only system packages such as Settings will meet this requirement).

. These are the same requirements for getLaunchedFromPackage(); if any of these are met, then these methods can be used to obtain the uid and package name of the launching app. If none are met, then Process#INVALID_UID is returned.

Note, even if the above conditions are not met, the launching app's identity may still be available from getCallingPackage() if this activity was started with Activity#startActivityForResult to allow validation of the result's recipient.

Return
Int	the uid of the launching app or Process#INVALID_UID if the current activity cannot access the identity of the launching app

See Also

• android.app.ActivityOptions#setShareIdentityEnabled(boolean)
• #getLaunchedFromPackage()

getLayoutInflater

Added in API level 1

open fun getLayoutInflater(): LayoutInflater

Convenience for calling android.view.Window#getLayoutInflater.

Return
LayoutInflater	This value cannot be null.

getLoaderManager

Added in API level 11
Deprecated in API level 28

open fun getLoaderManager(): LoaderManager!

Deprecated: Use androidx.fragment.app.FragmentActivity#getSupportLoaderManager()

Return the LoaderManager for this activity, creating it if needed.

getLocalClassName

Added in API level 1

open fun getLocalClassName(): String

Returns class name for this activity with the package prefix removed. This is the default name used to read and write settings.

Return
String	The local class name. This value cannot be null.

getMaxNumPictureInPictureActions

Added in API level 26

open fun getMaxNumPictureInPictureActions(): Int

Return the number of actions that will be displayed in the picture-in-picture UI when the user interacts with the activity currently in picture-in-picture mode. This number may change if the global configuration changes (ie. if the device is plugged into an external display), but will always be at least three.

getMediaController

Added in API level 21

fun getMediaController(): MediaController!

Gets the controller which should be receiving media key and volume events while this activity is in the foreground.

Return
MediaController!	The controller which should receive events.

See Also

• #setMediaController(android.media.session.MediaController)

getMenuInflater

Added in API level 1

open fun getMenuInflater(): MenuInflater

Returns a MenuInflater with this context.

Return
MenuInflater	This value cannot be null.

getOnBackInvokedDispatcher

Added in API level 33

open fun getOnBackInvokedDispatcher(): OnBackInvokedDispatcher

Returns the OnBackInvokedDispatcher instance associated with the window that this activity is attached to.

Return
OnBackInvokedDispatcher	This value cannot be null.

Exceptions
java.lang.IllegalStateException	if this Activity is not visual.

getParent

Added in API level 1
Deprecated in API level 35

fun getParent(): Activity!

Deprecated: ActivityGroup is deprecated.

Returns the parent Activity if this is a child Activity of an ActivityGroup.

getParentActivityIntent

Added in API level 16

open fun getParentActivityIntent(): Intent?

Obtain an Intent that will launch an explicit target activity specified by this activity's logical parent. The logical parent is named in the application's manifest by the parentActivityName attribute. Activity subclasses may override this method to modify the Intent returned by super.getParentActivityIntent() or to implement a different mechanism of retrieving the parent intent entirely.

Return
Intent?	a new Intent targeting the defined parent of this activity or null if there is no valid parent.

getPreferences

Added in API level 1

open fun getPreferences(mode: Int): SharedPreferences!

Retrieve a SharedPreferences object for accessing preferences that are private to this activity. This simply calls the underlying getSharedPreferences(java.lang.String,int) method by passing in this activity's class name as the preferences name.

Parameters
mode	Int: Operating mode. Use MODE_PRIVATE for the default operation. Value is either 0 or a combination of android.content.Context#MODE_PRIVATE, android.content.Context#MODE_WORLD_READABLE, android.content.Context#MODE_WORLD_WRITEABLE, and android.content.Context#MODE_MULTI_PROCESS

Return
SharedPreferences!	Returns the single SharedPreferences instance that can be used to retrieve and modify the preference values.

getReferrer

Added in API level 22

open fun getReferrer(): Uri?

Return information about who launched this activity. If the launching Intent contains an Intent.EXTRA_REFERRER, that will be returned as-is; otherwise, if known, an android-app: referrer URI containing the package name that started the Intent will be returned. This may return null if no referrer can be identified -- it is neither explicitly specified, nor is it known which application package was involved.

If called while inside the handling of #onNewIntent, this function will return the referrer that submitted that new intent to the activity only after setIntent(android.content.Intent) is called with the provided intent.

Note that this is not a security feature -- you can not trust the referrer information, applications can spoof it.

getRequestedOrientation

Added in API level 1

open fun getRequestedOrientation(): Int

Return the current requested orientation of the activity. This will either be the orientation requested in its component's manifest, or the last requested orientation given to setRequestedOrientation(int).

Return

Int

Returns an orientation constant as used in ActivityInfo.screenOrientation. Value is android.content.pm.ActivityInfo.SCREEN_ORIENTATION_UNSET, android.content.pm.ActivityInfo#SCREEN_ORIENTATION_UNSPECIFIED, android.content.pm.ActivityInfo#SCREEN_ORIENTATION_LANDSCAPE, android.content.pm.ActivityInfo#SCREEN_ORIENTATION_PORTRAIT, android.content.pm.ActivityInfo#SCREEN_ORIENTATION_USER, android.content.pm.ActivityInfo#SCREEN_ORIENTATION_BEHIND, android.content.pm.ActivityInfo#SCREEN_ORIENTATION_SENSOR, android.content.pm.ActivityInfo#SCREEN_ORIENTATION_NOSENSOR, android.content.pm.ActivityInfo#SCREEN_ORIENTATION_SENSOR_LANDSCAPE, android.content.pm.ActivityInfo#SCREEN_ORIENTATION_SENSOR_PORTRAIT, android.content.pm.ActivityInfo#SCREEN_ORIENTATION_REVERSE_LANDSCAPE, android.content.pm.ActivityInfo#SCREEN_ORIENTATION_REVERSE_PORTRAIT, android.content.pm.ActivityInfo#SCREEN_ORIENTATION_FULL_SENSOR, android.content.pm.ActivityInfo#SCREEN_ORIENTATION_USER_LANDSCAPE, android.content.pm.ActivityInfo#SCREEN_ORIENTATION_USER_PORTRAIT, android.content.pm.ActivityInfo#SCREEN_ORIENTATION_FULL_USER, or android.content.pm.ActivityInfo#SCREEN_ORIENTATION_LOCKED

getSearchEvent

Added in API level 23

fun getSearchEvent(): SearchEvent!

During the onSearchRequested() callbacks, this function will return the SearchEvent that triggered the callback, if it exists.

Return
SearchEvent!	SearchEvent The SearchEvent that triggered the #onSearchRequested callback.

getSplashScreen

Added in API level 31

fun getSplashScreen(): SplashScreen

Get the interface that activity use to talk to the splash screen.

Return
SplashScreen	This value cannot be null.

See Also

• android.window.SplashScreen

getSystemService

Added in API level 1

open fun getSystemService(name: String): Any!

Return the handle to a system-level service by name. The class of the returned object varies by the requested name. Currently available names are:

WINDOW_SERVICE ("window")

The top-level window manager in which you can place custom windows. The returned object is a android.view.WindowManager. Must only be obtained from a visual context such as Activity or a Context created with createWindowContext(int,android.os.Bundle), which are adjusted to the configuration and visual bounds of an area on screen.

LAYOUT_INFLATER_SERVICE ("layout_inflater")

A android.view.LayoutInflater for inflating layout resources in this context. Must only be obtained from a visual context such as Activity or a Context created with createWindowContext(int,android.os.Bundle), which are adjusted to the configuration and visual bounds of an area on screen.

ACTIVITY_SERVICE ("activity")

A android.app.ActivityManager for interacting with the global activity state of the system.

WALLPAPER_SERVICE ("wallpaper")

A android.service.wallpaper.WallpaperService for accessing wallpapers in this context. Must only be obtained from a visual context such as Activity or a Context created with createWindowContext(int,android.os.Bundle), which are adjusted to the configuration and visual bounds of an area on screen.

POWER_SERVICE ("power")

A android.os.PowerManager for controlling power management.

ALARM_SERVICE ("alarm")

A android.app.AlarmManager for receiving intents at the time of your choosing.

NOTIFICATION_SERVICE ("notification")

A android.app.NotificationManager for informing the user of background events.

KEYGUARD_SERVICE ("keyguard")

A android.app.KeyguardManager for controlling keyguard.

LOCATION_SERVICE ("location")

A android.location.LocationManager for controlling location (e.g., GPS) updates.

SEARCH_SERVICE ("search")

A android.app.SearchManager for handling search.

VIBRATOR_MANAGER_SERVICE ("vibrator_manager")

A android.os.VibratorManager for accessing the device vibrators, interacting with individual ones and playing synchronized effects on multiple vibrators.

VIBRATOR_SERVICE ("vibrator")

A android.os.Vibrator for interacting with the vibrator hardware.

CONNECTIVITY_SERVICE ("connectivity")

A ConnectivityManager for handling management of network connections.

IPSEC_SERVICE ("ipsec")

A IpSecManager for managing IPSec on sockets and networks.

WIFI_SERVICE ("wifi")

A WifiManager for management of Wi-Fi connectivity. On releases before Android 7, it should only be obtained from an application context, and not from any other derived context to avoid memory leaks within the calling process.

WIFI_AWARE_SERVICE ("wifiaware")

A WifiAwareManager for management of Wi-Fi Aware discovery and connectivity.

WIFI_P2P_SERVICE ("wifip2p")

A WifiP2pManager for management of Wi-Fi Direct connectivity.

INPUT_METHOD_SERVICE ("input_method")

An InputMethodManager for management of input methods.

UI_MODE_SERVICE ("uimode")

An android.app.UiModeManager for controlling UI modes.

DOWNLOAD_SERVICE ("download")

A android.app.DownloadManager for requesting HTTP downloads

BATTERY_SERVICE ("batterymanager")

A android.os.BatteryManager for managing battery state

JOB_SCHEDULER_SERVICE ("taskmanager")

A android.app.job.JobScheduler for managing scheduled tasks

NETWORK_STATS_SERVICE ("netstats")

A NetworkStatsManager for querying network usage statistics.

HARDWARE_PROPERTIES_SERVICE ("hardware_properties")

A android.os.HardwarePropertiesManager for accessing hardware properties.

DOMAIN_VERIFICATION_SERVICE ("domain_verification")

A android.content.pm.verify.domain.DomainVerificationManager for accessing web domain approval state.

DISPLAY_HASH_SERVICE ("display_hash")

A android.view.displayhash.DisplayHashManager for management of display hashes.

Note: System services obtained via this API may be closely associated with the Context in which they are obtained from. In general, do not share the service objects between various different contexts (Activities, Applications, Services, Providers, etc.)

Note: Instant apps, for which PackageManager#isInstantApp() returns true, don't have access to the following system services: DEVICE_POLICY_SERVICE, FINGERPRINT_SERVICE, KEYGUARD_SERVICE, SHORTCUT_SERVICE, USB_SERVICE, WALLPAPER_SERVICE, WIFI_P2P_SERVICE, WIFI_SERVICE, WIFI_AWARE_SERVICE. For these services this method will return null. Generally, if you are running as an instant app you should always check whether the result of this method is null.

Note: When implementing this method, keep in mind that new services can be added on newer Android releases, so if you're looking for just the explicit names mentioned above, make sure to return null when you don't recognize the name — if you throw a RuntimeException exception instead, your app might break on new Android releases.

Parameters

name

String: Value is android.content.Context#POWER_SERVICE, android.content.Context#WINDOW_SERVICE, android.content.Context#LAYOUT_INFLATER_SERVICE, android.content.Context#ACCOUNT_SERVICE, android.content.Context#ACTIVITY_SERVICE, android.content.Context#ALARM_SERVICE, android.content.Context#NOTIFICATION_SERVICE, android.content.Context#ACCESSIBILITY_SERVICE, android.content.Context#CAPTIONING_SERVICE, android.content.Context#KEYGUARD_SERVICE, android.content.Context#LOCATION_SERVICE, android.content.Context#HEALTHCONNECT_SERVICE, android.content.Context#SEARCH_SERVICE, android.content.Context#SENSOR_SERVICE, android.content.Context.SENSOR_PRIVACY_SERVICE, android.content.Context#STORAGE_SERVICE, android.content.Context#STORAGE_STATS_SERVICE, android.content.Context#WALLPAPER_SERVICE, android.content.Context#VIBRATOR_MANAGER_SERVICE, android.content.Context#VIBRATOR_SERVICE, android.content.Context.THREAD_NETWORK_SERVICE, android.content.Context#CONNECTIVITY_SERVICE, android.content.Context.PAC_PROXY_SERVICE, android.content.Context.VCN_MANAGEMENT_SERVICE, android.content.Context#IPSEC_SERVICE, android.content.Context#VPN_MANAGEMENT_SERVICE, android.content.Context.TEST_NETWORK_SERVICE, android.content.Context#NETWORK_STATS_SERVICE, android.content.Context#WIFI_SERVICE, android.content.Context#WIFI_AWARE_SERVICE, android.content.Context#WIFI_P2P_SERVICE, android.content.Context.WIFI_SCANNING_SERVICE, android.content.Context#WIFI_RTT_RANGING_SERVICE, android.content.Context#NSD_SERVICE, android.content.Context#AUDIO_SERVICE, android.content.Context.AUDIO_DEVICE_VOLUME_SERVICE, android.content.Context.AUTH_SERVICE, android.content.Context#FINGERPRINT_SERVICE, android.content.Context#BIOMETRIC_SERVICE, android.content.Context#MEDIA_ROUTER_SERVICE, android.content.Context#TELEPHONY_SERVICE, android.content.Context#TELEPHONY_SUBSCRIPTION_SERVICE, android.content.Context#CARRIER_CONFIG_SERVICE, android.content.Context#EUICC_SERVICE, android.content.Context#TELECOM_SERVICE, android.content.Context#CLIPBOARD_SERVICE, android.content.Context#INPUT_METHOD_SERVICE, android.content.Context#TEXT_SERVICES_MANAGER_SERVICE, android.content.Context#TEXT_CLASSIFICATION_SERVICE, android.content.Context#APPWIDGET_SERVICE, android.content.Context.REBOOT_READINESS_SERVICE, android.content.Context.ROLLBACK_SERVICE, android.content.Context#DROPBOX_SERVICE, android.content.Context#DEVICE_POLICY_SERVICE, android.content.Context#UI_MODE_SERVICE, android.content.Context#DOWNLOAD_SERVICE, android.content.Context#NFC_SERVICE, android.content.Context#BLUETOOTH_SERVICE, android.content.Context#USB_SERVICE, android.content.Context#LAUNCHER_APPS_SERVICE, android.content.Context#INPUT_SERVICE, android.content.Context#DISPLAY_SERVICE, android.content.Context#USER_SERVICE, android.content.Context#RESTRICTIONS_SERVICE, android.content.Context#APP_OPS_SERVICE, android.content.Context#ROLE_SERVICE, android.content.Context#CAMERA_SERVICE, android.content.Context#PRINT_SERVICE, android.content.Context#CONSUMER_IR_SERVICE, android.content.Context#TV_INTERACTIVE_APP_SERVICE, android.content.Context#TV_INPUT_SERVICE, android.content.Context#USAGE_STATS_SERVICE, android.content.Context#MEDIA_SESSION_SERVICE, android.content.Context#MEDIA_COMMUNICATION_SERVICE, android.content.Context#BATTERY_SERVICE, android.content.Context#JOB_SCHEDULER_SERVICE, android.content.Context#PERSISTENT_DATA_BLOCK_SERVICE, android.content.Context#MEDIA_PROJECTION_SERVICE, android.content.Context#MIDI_SERVICE, android.content.Context.RADIO_SERVICE, android.content.Context#HARDWARE_PROPERTIES_SERVICE, android.content.Context#SHORTCUT_SERVICE, android.content.Context#SYSTEM_HEALTH_SERVICE, android.content.Context#COMPANION_DEVICE_SERVICE, android.content.Context#VIRTUAL_DEVICE_SERVICE, android.content.Context#CROSS_PROFILE_APPS_SERVICE, android.content.Context.PERMISSION_SERVICE, android.content.Context.LIGHTS_SERVICE, android.content.Context#LOCALE_SERVICE, android.content.Context.UWB_SERVICE, android.content.Context#MEDIA_METRICS_SERVICE, android.content.Context#DISPLAY_HASH_SERVICE, android.content.Context#CREDENTIAL_SERVICE, android.content.Context#DEVICE_LOCK_SERVICE, android.content.Context.VIRTUALIZATION_SERVICE, android.content.Context#GRAMMATICAL_INFLECTION_SERVICE, android.content.Context#SECURITY_STATE_SERVICE, or android.content.Context#CONTACT_KEYS_SERVICE This value cannot be null.

Return
Any!	The service or null if the name does not exist.

getTaskId

Added in API level 1

open fun getTaskId(): Int

Return the identifier of the task this activity is in. This identifier will remain the same for the lifetime of the activity.

Return
Int	Task identifier, an opaque integer.

getTitle

Added in API level 1

fun getTitle(): CharSequence!

getTitleColor

Added in API level 1

fun getTitleColor(): Int

getVoiceInteractor

Added in API level 23

open fun getVoiceInteractor(): VoiceInteractor!

Retrieve the active VoiceInteractor that the user is going through to interact with this activity.

getVolumeControlStream

Added in API level 1

fun getVolumeControlStream(): Int

Gets the suggested audio stream whose volume should be changed by the hardware volume controls.

Return
Int	The suggested audio stream type whose volume should be changed by the hardware volume controls.

See Also

• #setVolumeControlStream(int)

getWindow

Added in API level 1

open fun getWindow(): Window!

Retrieve the current android.view.Window for the activity. This can be used to directly access parts of the Window API that are not available through Activity/Screen.

Return
Window!	Window The current window, or null if the activity is not visual.

getWindowManager

Added in API level 1

open fun getWindowManager(): WindowManager!

Retrieve the window manager for showing custom windows.

hasWindowFocus

Added in API level 3

open fun hasWindowFocus(): Boolean

Returns true if this activity's main window currently has window focus. Note that this is not the same as the view itself having focus.

Return
Boolean	True if this activity's main window currently has window focus.

See Also

• #onWindowAttributesChanged(android.view.WindowManager.LayoutParams)

invalidateOptionsMenu

Added in API level 11

open fun invalidateOptionsMenu(): Unit

Declare that the options menu has changed, so should be recreated. The onCreateOptionsMenu(android.view.Menu) method will be called the next time it needs to be displayed.

isActivityTransitionRunning

Added in API level 26

open fun isActivityTransitionRunning(): Boolean

Returns whether there are any activity transitions currently running on this activity. A return value of true can mean that either an enter or exit transition is running, including whether the background of the activity is animating as a part of that transition.

Return
Boolean	true if a transition is currently running on this activity, false otherwise.

isChangingConfigurations

Added in API level 11

open fun isChangingConfigurations(): Boolean

Check to see whether this activity is in the process of being destroyed in order to be recreated with a new configuration. This is often used in onStop to determine whether the state needs to be cleaned up or will be passed on to the next instance of the activity via onRetainNonConfigurationInstance().

Return
Boolean	If the activity is being torn down in order to be recreated with a new configuration, returns true; else returns false.

isChild

Added in API level 1
Deprecated in API level 35

fun isChild(): Boolean

Deprecated: ActivityGroup is deprecated.

Whether this is a child Activity of an ActivityGroup.

isDestroyed

Added in API level 17

open fun isDestroyed(): Boolean

Returns true if the final onDestroy() call has been made on the Activity, so this instance is now dead.

isFinishing

Added in API level 1

open fun isFinishing(): Boolean

Check to see whether this activity is in the process of finishing, either because you called finish on it or someone else has requested that it finished. This is often used in onPause to determine whether the activity is simply pausing or completely finishing.

Return
Boolean	If the activity is finishing, returns true; else returns false.

See Also

• #finish

isImmersive

Added in API level 18

open fun isImmersive(): Boolean

Bit indicating that this activity is "immersive" and should not be interrupted by notifications if possible. This value is initially set by the manifest property android:immersive but may be changed at runtime by setImmersive.

See Also

• #setImmersive(boolean)
• android.content.pm.ActivityInfo#FLAG_IMMERSIVE

isInMultiWindowMode

Added in API level 24

open fun isInMultiWindowMode(): Boolean

Returns true if the activity is currently in multi-window mode.

Return
Boolean	True if the activity is in multi-window mode.

See Also

• android.R.attr#resizeableActivity

isInPictureInPictureMode

Added in API level 24

open fun isInPictureInPictureMode(): Boolean

Returns true if the activity is currently in picture-in-picture mode.

Return
Boolean	True if the activity is in picture-in-picture mode.

See Also

• android.R.attr#supportsPictureInPicture

isLaunchedFromBubble

Added in API level 31

open fun isLaunchedFromBubble(): Boolean

Indicates whether this activity is launched from a bubble. A bubble is a floating shortcut on the screen that expands to show an activity. If your activity can be used normally or as a bubble, you might use this method to check if the activity is bubbled to modify any behaviour that might be different between the normal activity and the bubbled activity. For example, if you normally cancel the notification associated with the activity when you open the activity, you might not want to do that when you're bubbled as that would remove the bubble.

Return
Boolean	true if the activity is launched from a bubble.

See Also

• android.app.Notification.Builder#setBubbleMetadata(Notification.BubbleMetadata)
• android.app.Notification.BubbleMetadata.Builder#Builder(String)

isLocalVoiceInteractionSupported

Added in API level 24

open fun isLocalVoiceInteractionSupported(): Boolean

Queries whether the currently enabled voice interaction service supports returning a voice interactor for use by the activity. This is valid only for the duration of the activity.

Return
Boolean	whether the current voice interaction service supports local voice interaction

isTaskRoot

Added in API level 1

open fun isTaskRoot(): Boolean

Return whether this activity is the root of a task. The root is the first activity in a task.

Return
Boolean	True if this is the root activity, else false.

isVoiceInteraction

Added in API level 23

open fun isVoiceInteraction(): Boolean

Check whether this activity is running as part of a voice interaction with the user. If true, it should perform its interaction with the user through the VoiceInteractor returned by getVoiceInteractor.

isVoiceInteractionRoot

Added in API level 23

open fun isVoiceInteractionRoot(): Boolean

Like isVoiceInteraction, but only returns true if this is also the root of a voice interaction. That is, returns true if this activity was directly started by the voice interaction service as the initiation of a voice interaction. Otherwise, for example if it was started by another activity while under voice interaction, returns false. If the activity launchMode is singleTask, it forces the activity to launch in a new task, separate from the one that started it. Therefore, there is no longer a relationship between them, and isVoiceInteractionRoot() return false in this case.

managedQuery

Added in API level 1
Deprecated in API level 15

fun managedQuery(
    uri: Uri!, 
    projection: Array<String!>!, 
    selection: String!, 
    selectionArgs: Array<String!>!, 
    sortOrder: String!
): Cursor!

Deprecated: Use CursorLoader instead.

Wrapper around ContentResolver#query(android.net.Uri , String[], String, String[], String) that gives the resulting Cursor to call startManagingCursor so that the activity will manage its lifecycle for you. If you are targeting android.os.Build.VERSION_CODES#HONEYCOMB or later, consider instead using LoaderManager instead, available via getLoaderManager().

Warning: Do not call android.database.Cursor#close() on a cursor obtained using this method, because the activity will do that for you at the appropriate time. However, if you call stopManagingCursor on a cursor from a managed query, the system will not automatically close the cursor and, in that case, you must call android.database.Cursor#close().

Parameters
uri	Uri!: The URI of the content provider to query.
projection	Array<String!>!: List of columns to return.
selection	String!: SQL WHERE clause.
selectionArgs	Array<String!>!: The arguments to selection, if any ?s are pesent
sortOrder	String!: SQL ORDER BY clause.

Return
Cursor!	The Cursor that was returned by query().

See Also

• android.content.ContentResolver#query(android.net.Uri , String[], String, String[], String)
• #startManagingCursor

moveTaskToBack

Added in API level 1

open fun moveTaskToBack(nonRoot: Boolean): Boolean

Move the task containing this activity to the back of the activity stack. The activity's order within the task is unchanged.

Parameters
nonRoot	Boolean: If false then this only works if the activity is the root of a task; if true it will work for any activity in a task.

Return
Boolean	If the task was moved (or it was already at the back) true is returned, else false.

navigateUpTo

Added in API level 16

open fun navigateUpTo(upIntent: Intent!): Boolean

Navigate from this activity to the activity specified by upIntent, finishing this activity in the process. If the activity indicated by upIntent already exists in the task's history, this activity and all others before the indicated activity in the history stack will be finished.

If the indicated activity does not appear in the history stack, this will finish each activity in this task until the root activity of the task is reached, resulting in an "in-app home" behavior. This can be useful in apps with a complex navigation hierarchy when an activity may be reached by a path not passing through a canonical parent activity.

This method should be used when performing up navigation from within the same task as the destination. If up navigation should cross tasks in some cases, see shouldUpRecreateTask(android.content.Intent).

Parameters
upIntent	Intent!: An intent representing the target destination for up navigation

Return
Boolean	true if up navigation successfully reached the activity indicated by upIntent and upIntent was delivered to it. false if an instance of the indicated activity could not be found and this activity was simply finished normally.

navigateUpToFromChild

Added in API level 16
Deprecated in API level 30

open fun navigateUpToFromChild(
    child: Activity!, 
    upIntent: Intent!
): Boolean

Deprecated: Use navigateUpTo(android.content.Intent) instead.

This is called when a child activity of this one calls its navigateUpTo method. The default implementation simply calls navigateUpTo(upIntent) on this activity (the parent).

Parameters
child	Activity!: The activity making the call.
upIntent	Intent!: An intent representing the target destination for up navigation

Return
Boolean	true if up navigation successfully reached the activity indicated by upIntent and upIntent was delivered to it. false if an instance of the indicated activity could not be found and this activity was simply finished normally.

onActionModeFinished

Added in API level 11

open fun onActionModeFinished(mode: ActionMode!): Unit

Notifies the activity that an action mode has finished. Activity subclasses overriding this method should call the superclass implementation.
If you override this method you must call through to the superclass implementation.

Parameters
mode	ActionMode!: The action mode that just finished.

onActionModeStarted

Added in API level 11

open fun onActionModeStarted(mode: ActionMode!): Unit

Notifies the Activity that an action mode has been started. Activity subclasses overriding this method should call the superclass implementation.
If you override this method you must call through to the superclass implementation.

Parameters
mode	ActionMode!: The new action mode.

onActivityReenter

Added in API level 21

open fun onActivityReenter(
    resultCode: Int, 
    data: Intent!
): Unit

Called when an activity you launched with an activity transition exposes this Activity through a returning activity transition, giving you the resultCode and any additional data from it. This method will only be called if the activity set a result code other than RESULT_CANCELED and it supports activity transitions with Window#FEATURE_ACTIVITY_TRANSITIONS.

The purpose of this function is to let the called Activity send a hint about its state so that this underlying Activity can prepare to be exposed. A call to this method does not guarantee that the called Activity has or will be exiting soon. It only indicates that it will expose this Activity's Window and it has some data to pass to prepare it.

Parameters
resultCode	Int: The integer result code returned by the child activity through its setResult().
data	Intent!: An Intent, which can return result data to the caller (various data can be attached to Intent "extras").

onActivityResult

Added in API level 35

open fun onActivityResult(
    requestCode: Int, 
    resultCode: Int, 
    data: Intent?, 
    caller: ComponentCaller
): Unit

Same as onActivityResult(int,int,android.content.Intent), but with an extra parameter for the ComponentCaller instance associated with the app that sent the result.

If you want to retrieve the caller without overriding this method, call getCurrentCaller inside your existing onActivityResult(int,int,android.content.Intent).

Note that you should only override one #onActivityResult method.

Parameters
requestCode	Int: The integer request code originally supplied to startActivityForResult(), allowing you to identify who this result came from.
resultCode	Int: The integer result code returned by the child activity through its setResult().
data	Intent?: An Intent, which can return result data to the caller (various data can be attached to Intent "extras"). This value may be null.
caller	ComponentCaller: The ComponentCaller instance associated with the app that sent the intent. This value cannot be null.

onAttachFragment

Added in API level 11
Deprecated in API level 28

open fun onAttachFragment(fragment: Fragment!): Unit

Deprecated: Use androidx.fragment.app.FragmentActivity#onAttachFragment(androidx.fragment.app.Fragment)

Called when a Fragment is being attached to this activity, immediately after the call to its android.app.Fragment#onAttach method and before Fragment.onCreate().

onAttachedToWindow

Added in API level 5

open fun onAttachedToWindow(): Unit

Called when the main window associated with the activity has been attached to the window manager. See View.onAttachedToWindow() for more information.

See Also

• android.view.View#onAttachedToWindow

onBackPressed

Added in API level 5
Deprecated in API level 33

open fun onBackPressed(): Unit

Deprecated: Use OnBackInvokedCallback or androidx.activity.OnBackPressedCallback to handle back navigation instead.

Starting from Android 13 (API level 33), back event handling is moving to an ahead-of-time model and Activity#onBackPressed() and KeyEvent#KEYCODE_BACK should not be used to handle back events (back gesture or back button click). Instead, an OnBackInvokedCallback should be registered using Activity#getOnBackInvokedDispatcher() .registerOnBackInvokedCallback(priority, callback).

Called when the activity has detected the user's press of the back key. The default implementation depends on the platform version:

• On platform versions prior to android.os.Build.VERSION_CODES#S, it finishes the current activity, but you can override this to do whatever you want.
• Starting with platform version android.os.Build.VERSION_CODES#S, for activities that are the root activity of the task and also declare an android.content.IntentFilter with Intent#ACTION_MAIN and Intent#CATEGORY_LAUNCHER in the manifest, the current activity and its task will be moved to the back of the activity stack instead of being finished. Other activities will simply be finished.
• If you target version android.os.Build.VERSION_CODES#S and override this method, we strongly recommend to call through to the superclass implementation after you finish handling navigation within the app.

• If you target version android.os.Build.VERSION_CODES#TIRAMISU or later, you should not use this method but register an OnBackInvokedCallback on an OnBackInvokedDispatcher that you can retrieve using getOnBackInvokedDispatcher(). You should also set android:enableOnBackInvokedCallback="true" in the application manifest.

  Alternatively, you can use androidx.activity.ComponentActivity#getOnBackPressedDispatcher() for backward compatibility.

See Also

• #moveTaskToBack(boolean)

onConfigurationChanged

Added in API level 1

open fun onConfigurationChanged(newConfig: Configuration): Unit

Called by the system when the device configuration changes while your activity is running. Note that this will only be called if you have selected configurations you would like to handle with the android.R.attr#configChanges attribute in your manifest. If any configuration change occurs that is not selected to be reported by that attribute, then instead of reporting it the system will stop and restart the activity (to have it launched with the new configuration). The only exception is if a size-based configuration is not large enough to be considered significant, in which case the system will not recreate the activity and will instead call this method. For details on this see the documentation on size-based config change.

At the time that this function has been called, your Resources object will have been updated to return resource values matching the new configuration.

Parameters
newConfig	Configuration: The new device configuration. This value cannot be null.

onContentChanged

Added in API level 1

open fun onContentChanged(): Unit

onContextItemSelected

Added in API level 1

open fun onContextItemSelected(item: MenuItem): Boolean

This hook is called whenever an item in a context menu is selected. The default implementation simply returns false to have the normal processing happen (calling the item's Runnable or sending a message to its Handler as appropriate). You can use this method for any items for which you would like to do processing without those other facilities.

Use MenuItem#getMenuInfo() to get extra information set by the View that added this menu item.

Derived classes should call through to the base class for it to perform the default menu handling.

Parameters
item	MenuItem: The context menu item that was selected. This value cannot be null.

Return
Boolean	boolean Return false to allow normal context menu processing to proceed, true to consume it here.

onContextMenuClosed

Added in API level 1

open fun onContextMenuClosed(menu: Menu): Unit

This hook is called whenever the context menu is being closed (either by the user canceling the menu with the back/menu button, or when an item is selected).

Parameters
menu	Menu: The context menu that is being closed. This value cannot be null.

onCreate

Added in API level 21

open fun onCreate(
    savedInstanceState: Bundle?, 
    persistentState: PersistableBundle?
): Unit

Same as onCreate(android.os.Bundle) but called for those activities created with the attribute android.R.attr#persistableMode set to persistAcrossReboots.

Parameters
savedInstanceState	Bundle?: if the activity is being re-initialized after previously being shut down then this Bundle contains the data it most recently supplied in #onSaveInstanceState. Note: Otherwise it is null.
persistentState	PersistableBundle?: if the activity is being re-initialized after previously being shut down or powered off then this Bundle contains the data it most recently supplied to outPersistentState in #onSaveInstanceState. Note: Otherwise it is null.

See Also

• #onCreate(android.os.Bundle)
• #onStart

onCreateContextMenu

Added in API level 1

open fun onCreateContextMenu(
    menu: ContextMenu!, 
    v: View!, 
    menuInfo: ContextMenu.ContextMenuInfo!
): Unit

Called when a context menu for the view is about to be shown. Unlike onCreateOptionsMenu(android.view.Menu), this will be called every time the context menu is about to be shown and should be populated for the view (or item inside the view for AdapterView subclasses, this can be found in the menuInfo)).

Use onContextItemSelected(android.view.MenuItem) to know when an item has been selected.

It is not safe to hold onto the context menu after this method returns.

Parameters
menu	ContextMenu!: The context menu that is being built
v	View!: The view for which the context menu is being built
menuInfo	ContextMenu.ContextMenuInfo!: Extra information about the item for which the context menu should be shown. This information will vary depending on the class of v.

onCreateDescription

Added in API level 1

open fun onCreateDescription(): CharSequence?

Generate a new description for this activity. This method is called before stopping the activity and can, if desired, return some textual description of its current state to be displayed to the user.

The default implementation returns null, which will cause you to inherit the description from the previous activity. If all activities return null, generally the label of the top activity will be used as the description.

Return
CharSequence?	A description of what the user is doing. It should be short and sweet (only a few words).

See Also

• #onStop

onCreateNavigateUpTaskStack

Added in API level 16

open fun onCreateNavigateUpTaskStack(builder: TaskStackBuilder!): Unit

Define the synthetic task stack that will be generated during Up navigation from a different task.

The default implementation of this method adds the parent chain of this activity as specified in the manifest to the supplied TaskStackBuilder. Applications may choose to override this method to construct the desired task stack in a different way.

This method will be invoked by the default implementation of onNavigateUp() if shouldUpRecreateTask(android.content.Intent) returns true when supplied with the intent returned by getParentActivityIntent().

Applications that wish to supply extra Intent parameters to the parent stack defined by the manifest should override onPrepareNavigateUpTaskStack(android.app.TaskStackBuilder).

Parameters
builder	TaskStackBuilder!: An empty TaskStackBuilder - the application should add intents representing the desired task stack

onCreateOptionsMenu

Added in API level 1

open fun onCreateOptionsMenu(menu: Menu!): Boolean

Initialize the contents of the Activity's standard options menu. You should place your menu items in to menu.

This is only called once, the first time the options menu is displayed. To update the menu every time it is displayed, see onPrepareOptionsMenu.

The default implementation populates the menu with standard system menu items. These are placed in the Menu#CATEGORY_SYSTEM group so that they will be correctly ordered with application-defined menu items. Deriving classes should always call through to the base implementation.

You can safely hold on to menu (and any items created from it), making modifications to it as desired, until the next time onCreateOptionsMenu() is called.

When you add items to the menu, you can implement the Activity's onOptionsItemSelected method to handle them there.

Parameters
menu	Menu!: The options menu in which you place your items.

Return
Boolean	You must return true for the menu to be displayed; if you return false it will not be shown.

See Also

• #onPrepareOptionsMenu
• #onOptionsItemSelected

onCreatePanelMenu

Added in API level 1

open fun onCreatePanelMenu(
    featureId: Int, 
    menu: Menu
): Boolean

Default implementation of android.view.Window.Callback#onCreatePanelMenu for activities. This calls through to the new onCreateOptionsMenu method for the android.view.Window#FEATURE_OPTIONS_PANEL panel, so that subclasses of Activity don't need to deal with feature codes.

Parameters
featureId	Int: The panel being created.
menu	Menu: This value cannot be null.

Return
Boolean	boolean You must return true for the panel to be displayed; if you return false it will not be shown.

onCreatePanelView

Added in API level 1

open fun onCreatePanelView(featureId: Int): View?

Default implementation of android.view.Window.Callback#onCreatePanelView for activities. This simply returns null so that all panel sub-windows will have the default menu behavior.

Parameters
featureId	Int: Which panel is being created.

Return
View?	view The top-level view to place in the panel.

onCreateThumbnail

Added in API level 1
Deprecated in API level 28

open fun onCreateThumbnail(
    outBitmap: Bitmap!, 
    canvas: Canvas!
): Boolean

Deprecated: Method doesn't do anything and will be removed in the future.

onCreateView

Added in API level 1

open fun onCreateView(
    name: String, 
    context: Context, 
    attrs: AttributeSet
): View?

Standard implementation of android.view.LayoutInflater.Factory#onCreateView used when inflating with the LayoutInflater returned by #getSystemService. This implementation does nothing and is for pre-android.os.Build.VERSION_CODES#HONEYCOMB apps. Newer apps should use onCreateView(android.view.View,java.lang.String,android.content.Context,android.util.AttributeSet).

Parameters
name	String: This value cannot be null.
context	Context: This value cannot be null.
attrs	AttributeSet: This value cannot be null.

Return
View?	This value may be null.

See Also

• android.view.Window#getLayoutInflater

onCreateView

Added in API level 11

open fun onCreateView(
    parent: View?, 
    name: String, 
    context: Context, 
    attrs: AttributeSet
): View?

Standard implementation of android.view.LayoutInflater.Factory2#onCreateView(View, String, Context, AttributeSet) used when inflating with the LayoutInflater returned by #getSystemService. This implementation handles tags to embed fragments inside of the activity.

Parameters
parent	View?: This value may be null.
name	String: This value cannot be null.
context	Context: This value cannot be null.
attrs	AttributeSet: This value cannot be null.

Return
View?	This value may be null.

See Also

• android.view.Window#getLayoutInflater

onDetachedFromWindow

Added in API level 5

open fun onDetachedFromWindow(): Unit

Called when the main window associated with the activity has been detached from the window manager. See View.onDetachedFromWindow() for more information.

See Also

• android.view.View#onDetachedFromWindow

onEnterAnimationComplete

Added in API level 21

open fun onEnterAnimationComplete(): Unit

Activities cannot draw during the period that their windows are animating in. In order to know when it is safe to begin drawing they can override this method which will be called when the entering animation has completed.

onGenericMotionEvent

Added in API level 12

open fun onGenericMotionEvent(event: MotionEvent!): Boolean

Called when a generic motion event was not handled by any of the views inside of the activity.

Generic motion events describe joystick movements, hover events from mouse or stylus devices, trackpad touches, scroll wheel movements and other motion events not handled by onTouchEvent(android.view.MotionEvent) or onTrackballEvent(android.view.MotionEvent). The source of the motion event specifies the class of input that was received. Implementations of this method must examine the bits in the source before processing the event.

Generic motion events with source class android.view.InputDevice#SOURCE_CLASS_POINTER are delivered to the view under the pointer. All other generic motion events are delivered to the focused view.

See View#onGenericMotionEvent(MotionEvent) for an example of how to handle this event.

Parameters
event	MotionEvent!: The generic motion event being processed.

Return
Boolean	Return true if you have consumed the event, false if you haven't. The default implementation always returns false.

onGetDirectActions

Added in API level 29

open fun onGetDirectActions(
    cancellationSignal: CancellationSignal, 
    callback: Consumer<MutableList<DirectAction!>!>
): Unit

Returns the list of direct actions supported by the app.

You should return the list of actions that could be executed in the current context, which is in the current state of the app. If the actions that could be executed by the app changes you should report that via calling VoiceInteractor#notifyDirectActionsChanged().

To get the voice interactor you need to call getVoiceInteractor() which would return non null only if there is an ongoing voice interaction session. You can also detect when the voice interactor is no longer valid because the voice interaction session that is backing is finished by calling VoiceInteractor#registerOnDestroyedCallback(Executor, Runnable).

This method will be called only after onStart() and before onStop().

You should pass to the callback the currently supported direct actions which cannot be null or contain null elements.

You should return the action list as soon as possible to ensure the consumer, for example the assistant, is as responsive as possible which would improve user experience of your app.

Parameters
cancellationSignal	CancellationSignal: A signal to cancel the operation in progress. This value cannot be null.
callback	Consumer<MutableList<DirectAction!>!>: The callback to send the action list. The actions list cannot contain null elements. You can call this on any thread.

onKeyDown

Added in API level 1

open fun onKeyDown(
    keyCode: Int, 
    event: KeyEvent!
): Boolean

Called when a key was pressed down and not handled by any of the views inside of the activity. So, for example, key presses while the cursor is inside a TextView will not trigger the event (unless it is a navigation to another object) because TextView handles its own key presses.

If the focused view didn't want this event, this method is called.

The default implementation takes care of KeyEvent#KEYCODE_BACK by calling onBackPressed(), though the behavior varies based on the application compatibility mode: for android.os.Build.VERSION_CODES#ECLAIR or later applications, it will set up the dispatch to call onKeyUp where the action will be performed; for earlier applications, it will perform the action immediately in on-down, as those versions of the platform behaved. This implementation will also take care of KeyEvent#KEYCODE_ESCAPE by finishing the activity if it would be closed by touching outside of it.

Other additional default key handling may be performed if configured with setDefaultKeyMode.

Parameters
keyCode	Int: The value in event.getKeyCode().
event	KeyEvent!: Description of the key event.

Return
Boolean	Return true to prevent this event from being propagated further, or false to indicate that you have not handled this event and it should continue to be propagated.

See Also

• #onKeyUp
• android.view.KeyEvent

onKeyLongPress

Added in API level 5

open fun onKeyLongPress(
    keyCode: Int, 
    event: KeyEvent!
): Boolean

Default implementation of KeyEvent.Callback.onKeyLongPress(): always returns false (doesn't handle the event). To receive this callback, you must return true from onKeyDown for the current event stream.

Parameters
keyCode	Int: The value in event.getKeyCode().
event	KeyEvent!: Description of the key event.

Return
Boolean	If you handled the event, return true. If you want to allow the event to be handled by the next receiver, return false.

See Also

• android.view.KeyEvent.Callback#onKeyLongPress(int, KeyEvent)

onKeyMultiple

Added in API level 1

open fun onKeyMultiple(
    keyCode: Int, 
    repeatCount: Int, 
    event: KeyEvent!
): Boolean

Default implementation of KeyEvent.Callback.onKeyMultiple(): always returns false (doesn't handle the event).

Parameters
keyCode	Int: The value in event.getKeyCode().
count	Number of pairs as returned by event.getRepeatCount().
event	KeyEvent!: Description of the key event.

Return
Boolean	If you handled the event, return true. If you want to allow the event to be handled by the next receiver, return false.

onKeyShortcut

Added in API level 11

open fun onKeyShortcut(
    keyCode: Int, 
    event: KeyEvent!
): Boolean

Called when a key shortcut event is not handled by any of the views in the Activity. Override this method to implement global key shortcuts for the Activity. Key shortcuts can also be implemented by setting the shortcut property of menu items.

Parameters
keyCode	Int: The value in event.getKeyCode().
event	KeyEvent!: Description of the key event.

Return
Boolean	True if the key shortcut was handled.

onKeyUp

Added in API level 1

open fun onKeyUp(
    keyCode: Int, 
    event: KeyEvent!
): Boolean

Called when a key was released and not handled by any of the views inside of the activity. So, for example, key presses while the cursor is inside a TextView will not trigger the event (unless it is a navigation to another object) because TextView handles its own key presses.

The default implementation handles KEYCODE_BACK to stop the activity and go back.

Parameters
keyCode	Int: The value in event.getKeyCode().
event	KeyEvent!: Description of the key event.

Return
Boolean	Return true to prevent this event from being propagated further, or false to indicate that you have not handled this event and it should continue to be propagated.

See Also

• #onKeyDown
• android.view.KeyEvent

onLocalVoiceInteractionStarted

Added in API level 24

open fun onLocalVoiceInteractionStarted(): Unit

Callback to indicate that startLocalVoiceInteraction(android.os.Bundle) has resulted in a voice interaction session being started. You can now retrieve a voice interactor using getVoiceInteractor().

onLocalVoiceInteractionStopped

Added in API level 24

open fun onLocalVoiceInteractionStopped(): Unit

Callback to indicate that the local voice interaction has stopped either because it was requested through a call to stopLocalVoiceInteraction() or because it was canceled by the user. The previously acquired VoiceInteractor is no longer valid after this.

onLowMemory

Added in API level 1

open fun onLowMemory(): Unit

onMenuItemSelected

Added in API level 1

open fun onMenuItemSelected(
    featureId: Int, 
    item: MenuItem
): Boolean

Default implementation of android.view.Window.Callback#onMenuItemSelected for activities. This calls through to the new onOptionsItemSelected method for the android.view.Window#FEATURE_OPTIONS_PANEL panel, so that subclasses of Activity don't need to deal with feature codes.

Parameters
featureId	Int: The panel that the menu is in.
item	MenuItem: This value cannot be null.

Return
Boolean	boolean Return true to finish processing of selection, or false to perform the normal menu handling (calling its Runnable or sending a Message to its target Handler).

onMenuOpened

Added in API level 1

open fun onMenuOpened(
    featureId: Int, 
    menu: Menu
): Boolean

Called when a panel's menu is opened by the user. This may also be called when the menu is changing from one type to another (for example, from the icon menu to the expanded menu).

Parameters
featureId	Int: The panel that the menu is in.
menu	Menu: This value cannot be null.

Return
Boolean	The default implementation returns true.

onMultiWindowModeChanged

Added in API level 26

open fun onMultiWindowModeChanged(
    isInMultiWindowMode: Boolean, 
    newConfig: Configuration!
): Unit

Called by the system when the activity changes from fullscreen mode to multi-window mode and visa-versa. This method provides the same configuration that will be sent in the following onConfigurationChanged(android.content.res.Configuration) call after the activity enters this mode.

Parameters
isInMultiWindowMode	Boolean: True if the activity is in multi-window mode.
newConfig	Configuration!: The new configuration of the activity with the state {@param isInMultiWindowMode}.

See Also

• android.R.attr#resizeableActivity

onMultiWindowModeChanged

Added in API level 24
Deprecated in API level 26

open fun onMultiWindowModeChanged(isInMultiWindowMode: Boolean): Unit

Deprecated: Use onMultiWindowModeChanged(boolean,android.content.res.Configuration) instead.

Called by the system when the activity changes from fullscreen mode to multi-window mode and visa-versa.

Parameters
isInMultiWindowMode	Boolean: True if the activity is in multi-window mode.

See Also

• android.R.attr#resizeableActivity

onNavigateUp

Added in API level 16

open fun onNavigateUp(): Boolean

This method is called whenever the user chooses to navigate Up within your application's activity hierarchy from the action bar.

If the attribute parentActivityName was specified in the manifest for this activity or an activity-alias to it, default Up navigation will be handled automatically. If any activity along the parent chain requires extra Intent arguments, the Activity subclass should override the method onPrepareNavigateUpTaskStack(android.app.TaskStackBuilder) to supply those arguments.

See Tasks and Back Stack from the developer guide and Navigation from the design guide for more information about navigating within your app.

See the TaskStackBuilder class and the Activity methods getParentActivityIntent(), shouldUpRecreateTask(android.content.Intent), and navigateUpTo(android.content.Intent) for help implementing custom Up navigation. The AppNavigation sample application in the Android SDK is also available for reference.

Return
Boolean	true if Up navigation completed successfully and this Activity was finished, false otherwise.

onNavigateUpFromChild

Added in API level 16
Deprecated in API level 30

open fun onNavigateUpFromChild(child: Activity!): Boolean

Deprecated: Use onNavigateUp() instead.

This is called when a child activity of this one attempts to navigate up. The default implementation simply calls onNavigateUp() on this activity (the parent).

Parameters
child	Activity!: The activity making the call.

onNewIntent

Added in API level 35

open fun onNewIntent(
    intent: Intent, 
    caller: ComponentCaller
): Unit

Same as onNewIntent(android.content.Intent), but with an extra parameter for the ComponentCaller instance associated with the app that sent the intent.

If you want to retrieve the caller without overriding this method, call getCurrentCaller inside your existing onNewIntent(android.content.Intent).

Note that you should only override one #onNewIntent method.

Parameters
intent	Intent: The new intent that was used to start the activity This value cannot be null.
caller	ComponentCaller: The ComponentCaller instance associated with the app that sent the intent This value cannot be null.

See Also

• android.app.ComponentCaller
• #onNewIntent(Intent)
• #getCurrentCaller
• #setIntent(Intent, ComponentCaller)
• #getCaller

onOptionsItemSelected

Added in API level 1

open fun onOptionsItemSelected(item: MenuItem): Boolean

This hook is called whenever an item in your options menu is selected. The default implementation simply returns false to have the normal processing happen (calling the item's Runnable or sending a message to its Handler as appropriate). You can use this method for any items for which you would like to do processing without those other facilities.

Derived classes should call through to the base class for it to perform the default menu handling.

Parameters
item	MenuItem: The menu item that was selected. This value cannot be null.

Return
Boolean	boolean Return false to allow normal menu processing to proceed, true to consume it here.

See Also

• #onCreateOptionsMenu

onOptionsMenuClosed

Added in API level 1

open fun onOptionsMenuClosed(menu: Menu!): Unit

This hook is called whenever the options menu is being closed (either by the user canceling the menu with the back/menu button, or when an item is selected).

Parameters
menu	Menu!: The options menu as last shown or first initialized by onCreateOptionsMenu().

onPanelClosed

Added in API level 1

open fun onPanelClosed(
    featureId: Int, 
    menu: Menu
): Unit

Default implementation of android.view.Window.Callback#onPanelClosed(int, Menu) for activities. This calls through to onOptionsMenuClosed(android.view.Menu) method for the android.view.Window#FEATURE_OPTIONS_PANEL panel, so that subclasses of Activity don't need to deal with feature codes. For context menus (Window#FEATURE_CONTEXT_MENU), the onContextMenuClosed(android.view.Menu) will be called.

Parameters
featureId	Int: The panel that is being displayed.
menu	Menu: This value cannot be null.

onPerformDirectAction

Added in API level 29

open fun onPerformDirectAction(
    actionId: String, 
    arguments: Bundle, 
    cancellationSignal: CancellationSignal, 
    resultListener: Consumer<Bundle!>
): Unit

This is called to perform an action previously defined by the app. Apps also have access to getVoiceInteractor() to follow up on the action.

Parameters
actionId	String: The ID for the action you previously reported via onGetDirectActions(android.os.CancellationSignal,java.util.function.Consumer). This value cannot be null.
arguments	Bundle: Any additional arguments provided by the caller that are specific to the given action. This value cannot be null.
cancellationSignal	CancellationSignal: A signal to cancel the operation in progress. This value cannot be null.
resultListener	Consumer<Bundle!>: The callback to provide the result back to the caller. You can call this on any thread. The result bundle is action specific. This value cannot be null.

See Also

• #onGetDirectActions(CancellationSignal, Consumer)

onPictureInPictureModeChanged

Added in API level 26

open fun onPictureInPictureModeChanged(
    isInPictureInPictureMode: Boolean, 
    newConfig: Configuration!
): Unit

Called by the system when the activity changes to and from picture-in-picture mode. This method provides the same configuration that will be sent in the following onConfigurationChanged(android.content.res.Configuration) call after the activity enters this mode.

Parameters
isInPictureInPictureMode	Boolean: True if the activity is in picture-in-picture mode.
newConfig	Configuration!: The new configuration of the activity with the state {@param isInPictureInPictureMode}.

See Also

• android.R.attr#supportsPictureInPicture

onPictureInPictureModeChanged

Added in API level 24
Deprecated in API level 26

open fun onPictureInPictureModeChanged(isInPictureInPictureMode: Boolean): Unit

Deprecated: Use onPictureInPictureModeChanged(boolean,android.content.res.Configuration) instead.

Called by the system when the activity changes to and from picture-in-picture mode.

Parameters
isInPictureInPictureMode	Boolean: True if the activity is in picture-in-picture mode.

See Also

• android.R.attr#supportsPictureInPicture

onPictureInPictureRequested

Added in API level 30

open fun onPictureInPictureRequested(): Boolean

This method is called by the system in various cases where picture in picture mode should be entered if supported.

It is up to the app developer to choose whether to call enterPictureInPictureMode(android.app.PictureInPictureParams) at this time. For example, the system will call this method when the activity is being put into the background, so the app developer might want to switch an activity into PIP mode instead.

Return
Boolean	true if the activity received this callback regardless of if it acts on it or not. If false, the framework will assume the app hasn't been updated to leverage this callback and will in turn send a legacy callback of onUserLeaveHint() for the app to enter picture-in-picture mode.

onPictureInPictureUiStateChanged

Added in API level 31

open fun onPictureInPictureUiStateChanged(pipState: PictureInPictureUiState): Unit

Called by the system when the activity is in PiP and has state changes. Compare to onPictureInPictureModeChanged(boolean,android.content.res.Configuration), which is only called when PiP mode changes (meaning, enters or exits PiP), this can be called at any time while the activity is in PiP mode. Therefore, all invocation can only happen after onPictureInPictureModeChanged(boolean,android.content.res.Configuration) is called with true, and before onPictureInPictureModeChanged(boolean,android.content.res.Configuration) is called with false. You would not need to worry about cases where this is called and the activity is not in Picture-In-Picture mode. For managing cases where the activity enters/exits Picture-in-Picture (e.g. resources clean-up on exit), use onPictureInPictureModeChanged(boolean,android.content.res.Configuration). The default state is everything declared in PictureInPictureUiState is false, such as PictureInPictureUiState#isStashed().

Parameters
pipState	PictureInPictureUiState: the new Picture-in-Picture state. This value cannot be null.

onPostCreate

Added in API level 21

open fun onPostCreate(
    savedInstanceState: Bundle?, 
    persistentState: PersistableBundle?
): Unit

This is the same as onPostCreate(android.os.Bundle) but is called for activities created with the attribute android.R.attr#persistableMode set to persistAcrossReboots.

Parameters
savedInstanceState	Bundle?: The data most recently supplied in #onSaveInstanceState This value may be null.
persistentState	PersistableBundle?: The data coming from the PersistableBundle first saved in onSaveInstanceState(android.os.Bundle,android.os.PersistableBundle). This value may be null.

See Also

onPrepareNavigateUpTaskStack

Added in API level 16

open fun onPrepareNavigateUpTaskStack(builder: TaskStackBuilder!): Unit

Prepare the synthetic task stack that will be generated during Up navigation from a different task.

This method receives the TaskStackBuilder with the constructed series of Intents as generated by onCreateNavigateUpTaskStack(android.app.TaskStackBuilder). If any extra data should be added to these intents before launching the new task, the application should override this method and add that data here.

Parameters
builder	TaskStackBuilder!: A TaskStackBuilder that has been populated with Intents by onCreateNavigateUpTaskStack.

onPrepareOptionsMenu

Added in API level 1

open fun onPrepareOptionsMenu(menu: Menu!): Boolean

Prepare the Screen's standard options menu to be displayed. This is called right before the menu is shown, every time it is shown. You can use this method to efficiently enable/disable items or otherwise dynamically modify the contents.

The default implementation updates the system menu items based on the activity's state. Deriving classes should always call through to the base class implementation.

Parameters
menu	Menu!: The options menu as last shown or first initialized by onCreateOptionsMenu().

Return
Boolean	You must return true for the menu to be displayed; if you return false it will not be shown.

See Also

• #onCreateOptionsMenu

onPreparePanel

Added in API level 1

open fun onPreparePanel(
    featureId: Int, 
    view: View?, 
    menu: Menu
): Boolean

Default implementation of android.view.Window.Callback#onPreparePanel for activities. This calls through to the new onPrepareOptionsMenu method for the android.view.Window#FEATURE_OPTIONS_PANEL panel, so that subclasses of Activity don't need to deal with feature codes.

Parameters
featureId	Int: The panel that is being displayed.
view	View?: This value may be null.
menu	Menu: This value cannot be null.

Return
Boolean	boolean You must return true for the panel to be displayed; if you return false it will not be shown.

onProvideAssistContent

Added in API level 23

open fun onProvideAssistContent(outContent: AssistContent!): Unit

This is called when the user is requesting an assist, to provide references to content related to the current activity. Before being called, the outContent Intent is filled with the base Intent of the activity (the Intent returned by getIntent()). The Intent's extras are stripped of any types that are not valid for PersistableBundle or non-framework Parcelables, and the flags Intent#FLAG_GRANT_WRITE_URI_PERMISSION and Intent#FLAG_GRANT_PERSISTABLE_URI_PERMISSION are cleared from the Intent.

Custom implementation may adjust the content intent to better reflect the top-level context of the activity, and fill in its ClipData with additional content of interest that the user is currently viewing. For example, an image gallery application that has launched in to an activity allowing the user to swipe through pictures should modify the intent to reference the current image they are looking it; such an application when showing a list of pictures should add a ClipData that has references to all of the pictures currently visible on screen.

Parameters
outContent	AssistContent!: The assist content to return.

onProvideAssistData

Added in API level 18

open fun onProvideAssistData(data: Bundle!): Unit

This is called when the user is requesting an assist, to build a full Intent#ACTION_ASSIST Intent with all of the context of the current application. You can override this method to place into the bundle anything you would like to appear in the Intent#EXTRA_ASSIST_CONTEXT part of the assist Intent.

This function will be called after any global assist callbacks that had been registered with Application.registerOnProvideAssistDataListener.

onProvideKeyboardShortcuts

Added in API level 24

open fun onProvideKeyboardShortcuts(
    data: MutableList<KeyboardShortcutGroup!>!, 
    menu: Menu?, 
    deviceId: Int
): Unit

Parameters
data	MutableList<KeyboardShortcutGroup!>!: The data list to populate with shortcuts.
menu	Menu?: The current menu, which may be null.
deviceId	Int: The id for the connected device the shortcuts should be provided for.

onProvideReferrer

Added in API level 23

open fun onProvideReferrer(): Uri!

Override to generate the desired referrer for the content currently being shown by the app. The default implementation returns null, meaning the referrer will simply be the android-app: of the package name of this activity. Return a non-null Uri to have that supplied as the Intent#EXTRA_REFERRER of any activities started from it.

onRequestPermissionsResult

Added in API level 23

open fun onRequestPermissionsResult(
    requestCode: Int, 
    permissions: Array<String!>, 
    grantResults: IntArray
): Unit

Callback for the result from requesting permissions. This method is invoked for every call on #requestPermissions

Note: It is possible that the permissions request interaction with the user is interrupted. In this case you will receive empty permissions and results arrays which should be treated as a cancellation.

Parameters
requestCode	Int: The request code passed in #requestPermissions.
permissions	Array<String!>: The requested permissions. Never null.
grantResults	IntArray: The grant results for the corresponding permissions which is either android.content.pm.PackageManager#PERMISSION_GRANTED or android.content.pm.PackageManager#PERMISSION_DENIED. Never null.

See Also

onRequestPermissionsResult

Added in API level 35

open fun onRequestPermissionsResult(
    requestCode: Int, 
    permissions: Array<String!>, 
    grantResults: IntArray, 
    deviceId: Int
): Unit

Callback for the result from requesting permissions. This method is invoked for every call on #requestPermissions.

Note: It is possible that the permissions request interaction with the user is interrupted. In this case you will receive empty permissions and results arrays which should be treated as a cancellation.

Parameters
requestCode	Int: The request code passed in #requestPermissions.
permissions	Array<String!>: The requested permissions. Never null.
grantResults	IntArray: The grant results for the corresponding permissions which is either android.content.pm.PackageManager#PERMISSION_GRANTED or android.content.pm.PackageManager#PERMISSION_DENIED. Never null.
deviceId	Int: The deviceId for which permissions were requested. The primary/physical device is assigned Context#DEVICE_ID_DEFAULT, and virtual devices are assigned unique device Ids.

See Also

onRestoreInstanceState

Added in API level 21

open fun onRestoreInstanceState(
    savedInstanceState: Bundle?, 
    persistentState: PersistableBundle?
): Unit

This is the same as onRestoreInstanceState(android.os.Bundle) but is called for activities created with the attribute android.R.attr#persistableMode set to persistAcrossReboots. The android.os.PersistableBundle passed came from the restored PersistableBundle first saved in onSaveInstanceState(android.os.Bundle,android.os.PersistableBundle).

This method is called between onStart and #onPostCreate.

If this method is called onRestoreInstanceState(android.os.Bundle) will not be called.

At least one of savedInstanceState or persistentState will not be null.

Parameters
savedInstanceState	Bundle?: the data most recently supplied in #onSaveInstanceState or null.
persistentState	PersistableBundle?: the data most recently supplied in #onSaveInstanceState or null.

See Also

• #onRestoreInstanceState(Bundle)
• #onResume

onRetainNonConfigurationInstance

Added in API level 1

open fun onRetainNonConfigurationInstance(): Any!

Called by the system, as part of destroying an activity due to a configuration change, when it is known that a new instance will immediately be created for the new configuration. You can return any object you like here, including the activity instance itself, which can later be retrieved by calling getLastNonConfigurationInstance() in the new activity instance. If you are targeting android.os.Build.VERSION_CODES#HONEYCOMB or later, consider instead using a Fragment with Fragment.setRetainInstance(boolean.

This function is called purely as an optimization, and you must not rely on it being called. When it is called, a number of guarantees will be made to help optimize configuration switching:

• The function will be called between onStop and onDestroy.
• A new instance of the activity will always be immediately created after this one's onDestroy() is called. In particular, no messages will be dispatched during this time (when the returned object does not have an activity to be associated with).
• The object you return here will always be available from the getLastNonConfigurationInstance() method of the following activity instance as described there.

These guarantees are designed so that an activity can use this API to propagate extensive state from the old to new activity instance, from loaded bitmaps, to network connections, to evenly actively running threads. Note that you should not propagate any data that may change based on the configuration, including any data loaded from resources such as strings, layouts, or drawables.

The guarantee of no message handling during the switch to the next activity simplifies use with active objects. For example if your retained state is an android.os.AsyncTask you are guaranteed that its call back functions (like android.os.AsyncTask#onPostExecute) will not be called from the call here until you execute the next instance's onCreate(android.os.Bundle). (Note however that there is of course no such guarantee for android.os.AsyncTask#doInBackground since that is running in a separate thread.)

Note: For most cases you should use the Fragment API Fragment#setRetainInstance(boolean) instead; this is also available on older platforms through the Android support libraries.

Return
Any!	any Object holding the desired state to propagate to the next activity instance

onSaveInstanceState

Added in API level 21

open fun onSaveInstanceState(
    outState: Bundle, 
    outPersistentState: PersistableBundle
): Unit

This is the same as #onSaveInstanceState but is called for activities created with the attribute android.R.attr#persistableMode set to persistAcrossReboots. The android.os.PersistableBundle passed in will be saved and presented in onCreate(android.os.Bundle,android.os.PersistableBundle) the first time that this activity is restarted following the next device reboot.

Parameters
outState	Bundle: Bundle in which to place your saved state. This value cannot be null.
outPersistentState	PersistableBundle: State which will be saved across reboots. This value cannot be null.

See Also

• #onSaveInstanceState(Bundle)
• #onRestoreInstanceState(Bundle, PersistableBundle)
• #onPause

onSearchRequested

Added in API level 23

open fun onSearchRequested(searchEvent: SearchEvent?): Boolean

This hook is called when the user signals the desire to start a search.

You can use this function as a simple way to launch the search UI, in response to a menu item, search button, or other widgets within your activity. Unless overridden, calling this function is the same as calling startSearch(null,false,null,false), which launches search for the current activity as specified in its manifest, see SearchManager.

You can override this function to force global search, e.g. in response to a dedicated search key, or to block search entirely (by simply returning false).

Note: when running in a Configuration#UI_MODE_TYPE_TELEVISION or Configuration#UI_MODE_TYPE_WATCH, the default implementation changes to simply return false and you must supply your own custom implementation if you want to support search.

Parameters
searchEvent	SearchEvent?: The SearchEvent that signaled this search. This value may be null.

Return
Boolean	Returns true if search launched, and false if the activity does not respond to search. The default implementation always returns true, except when in Configuration#UI_MODE_TYPE_TELEVISION mode where it returns false.

See Also

• android.app.SearchManager

onSearchRequested

Added in API level 1

open fun onSearchRequested(): Boolean

Return
Boolean	true if search launched, false if activity refuses (blocks)

See Also

• #onSearchRequested(SearchEvent)

onStateNotSaved

Added in API level 23
Deprecated in API level 29

open fun onStateNotSaved(): Unit

Deprecated: starting with android.os.Build.VERSION_CODES#P onSaveInstanceState is called after onStop, so this hint isn't accurate anymore: you should consider your state not saved in between onStart and onStop callbacks inclusively.

Called when an onResume is coming up, prior to other pre-resume callbacks such as #onNewIntent and #onActivityResult. This is primarily intended to give the activity a hint that its state is no longer saved -- it will generally be called after #onSaveInstanceState and prior to the activity being resumed/started again.

onTopResumedActivityChanged

Added in API level 29

open fun onTopResumedActivityChanged(isTopResumedActivity: Boolean): Unit

Called when activity gets or loses the top resumed position in the system.

Starting with android.os.Build.VERSION_CODES#Q multiple activities can be resumed at the same time in multi-window and multi-display modes. This callback should be used instead of onResume() as an indication that the activity can try to open exclusive-access devices like camera.

It will always be delivered after the activity was resumed and before it is paused. In some cases it might be skipped and activity can go straight from onResume() to onPause() without receiving the top resumed state.

Parameters
isTopResumedActivity	Boolean: true if it's the topmost resumed activity in the system, false otherwise. A call with this as true will always be followed by another one with false.

See Also

• #onResume()
• #onPause()
• #onWindowFocusChanged(boolean)

onTouchEvent

Added in API level 1

open fun onTouchEvent(event: MotionEvent!): Boolean

Called when a touch screen event was not handled by any of the views inside of the activity. This is most useful to process touch events that happen outside of your window bounds, where there is no view to receive it.

Parameters
event	MotionEvent!: The touch screen event being processed.

Return
Boolean	Return true if you have consumed the event, false if you haven't.

onTrackballEvent

Added in API level 1

open fun onTrackballEvent(event: MotionEvent!): Boolean

Called when the trackball was moved and not handled by any of the views inside of the activity. So, for example, if the trackball moves while focus is on a button, you will receive a call here because buttons do not normally do anything with trackball events. The call here happens before trackball movements are converted to DPAD key events, which then get sent back to the view hierarchy, and will be processed at the point for things like focus navigation.

Parameters
event	MotionEvent!: The trackball event being processed.

Return
Boolean	Return true if you have consumed the event, false if you haven't. The default implementation always returns false.

onTrimMemory

Added in API level 14

open fun onTrimMemory(level: Int): Unit

Parameters

level

Int: The context of the trim, giving a hint of the amount of trimming the application may like to perform. Value is android.content.ComponentCallbacks2#TRIM_MEMORY_COMPLETE, android.content.ComponentCallbacks2#TRIM_MEMORY_MODERATE, android.content.ComponentCallbacks2#TRIM_MEMORY_BACKGROUND, android.content.ComponentCallbacks2#TRIM_MEMORY_UI_HIDDEN, android.content.ComponentCallbacks2#TRIM_MEMORY_RUNNING_CRITICAL, android.content.ComponentCallbacks2#TRIM_MEMORY_RUNNING_LOW, or android.content.ComponentCallbacks2#TRIM_MEMORY_RUNNING_MODERATE

onUserInteraction

Added in API level 3

open fun onUserInteraction(): Unit

Called whenever a key, touch, or trackball event is dispatched to the activity. Implement this method if you wish to know that the user has interacted with the device in some way while your activity is running. This callback and onUserLeaveHint are intended to help activities manage status bar notifications intelligently; specifically, for helping activities determine the proper time to cancel a notification.

All calls to your activity's onUserLeaveHint callback will be accompanied by calls to onUserInteraction. This ensures that your activity will be told of relevant user activity such as pulling down the notification pane and touching an item there.

Note that this callback will be invoked for the touch down action that begins a touch gesture, but may not be invoked for the touch-moved and touch-up actions that follow.

See Also

• #onUserLeaveHint()

onVisibleBehindCanceled

Added in API level 21
Deprecated in API level 26

open fun onVisibleBehindCanceled(): Unit

Deprecated: This method's functionality is no longer supported as of android.os.Build.VERSION_CODES#O and will be removed in a future release.

Called when a translucent activity over this activity is becoming opaque or another activity is being launched. Activities that override this method must call super.onVisibleBehindCanceled() or a SuperNotCalledException will be thrown.

When this method is called the activity has 500 msec to release any resources it may be using while visible in the background. If the activity has not returned from this method in 500 msec the system will destroy the activity and kill the process in order to recover the resources for another process. Otherwise onStop() will be called following return.
If you override this method you must call through to the superclass implementation.

See Also

• #requestVisibleBehind(boolean)

onWindowAttributesChanged

Added in API level 1

open fun onWindowAttributesChanged(params: WindowManager.LayoutParams!): Unit

onWindowFocusChanged

Added in API level 1

open fun onWindowFocusChanged(hasFocus: Boolean): Unit

Called when the current Window of the activity gains or loses focus. This is the best indicator of whether this activity is the entity with which the user actively interacts. The default implementation clears the key tracking state, so should always be called.

Note that this provides information about global focus state, which is managed independently of activity lifecycle. As such, while focus changes will generally have some relation to lifecycle changes (an activity that is stopped will not generally get window focus), you should not rely on any particular order between the callbacks here and those in the other lifecycle methods such as onResume.

As a general rule, however, a foreground activity will have window focus... unless it has displayed other dialogs or popups that take input focus, in which case the activity itself will not have focus when the other windows have it. Likewise, the system may display system-level windows (such as the status bar notification panel or a system alert) which will temporarily take window input focus without pausing the foreground activity.

Starting with android.os.Build.VERSION_CODES#Q there can be multiple resumed activities at the same time in multi-window mode, so resumed state does not guarantee window focus even if there are no overlays above.

If the intent is to know when an activity is the topmost active, the one the user interacted with last among all activities but not including non-activity windows like dialogs and popups, then onTopResumedActivityChanged(boolean) should be used. On platform versions prior to android.os.Build.VERSION_CODES#Q, onResume is the best indicator.

Parameters
hasFocus	Boolean: Whether the window of this activity has focus.

See Also

• #hasWindowFocus()
• #onResume
• android.view.View#onWindowFocusChanged(boolean)
• #onTopResumedActivityChanged(boolean)

onWindowStartingActionMode

Added in API level 11

open fun onWindowStartingActionMode(callback: ActionMode.Callback!): ActionMode?

Give the Activity a chance to control the UI for an action mode requested by the system.

Note: If you are looking for a notification callback that an action mode has been started for this activity, see onActionModeStarted(android.view.ActionMode).

Parameters
callback	ActionMode.Callback!: The callback that should control the new action mode

Return
ActionMode?	The new action mode, or null if the activity does not want to provide special handling for this action mode. (It will be handled by the system.)

onWindowStartingActionMode

Added in API level 23

open fun onWindowStartingActionMode(
    callback: ActionMode.Callback!, 
    type: Int
): ActionMode?

Called when an action mode is being started for this window. Gives the callback an opportunity to handle the action mode in its own unique and beautiful way. If this method returns null the system can choose a way to present the mode or choose not to start the mode at all.

Parameters
callback	ActionMode.Callback!: Callback to control the lifecycle of this action mode
type	Int: One of ActionMode#TYPE_PRIMARY or ActionMode#TYPE_FLOATING.

Return
ActionMode?	This value may be null.

openContextMenu

Added in API level 1

open fun openContextMenu(view: View!): Unit

Programmatically opens the context menu for a particular view. The view should have been added via registerForContextMenu(android.view.View).

Parameters
view	View!: The view to show the context menu for.

openOptionsMenu

Added in API level 1

open fun openOptionsMenu(): Unit

Programmatically opens the options menu. If the options menu is already open, this method does nothing.

overrideActivityTransition

Added in API level 34

open fun overrideActivityTransition(
    overrideType: Int, 
    enterAnim: Int, 
    exitAnim: Int
): Unit

Customizes the animation for the activity transition with this activity. This can be called at any time while the activity still alive.

This is a more robust method of overriding the transition animation at runtime without relying on overridePendingTransition(int,int) which doesn't work for predictive back. However, the animation set from overridePendingTransition(int,int) still has higher priority when the system is looking for the next transition animation.

The animations resources set by this method will be chosen if and only if the activity is on top of the task while activity transitions are being played. For example, if we want to customize the opening transition when launching Activity B which gets started from Activity A, we should call this method inside B's onCreate with overrideType = OVERRIDE_TRANSITION_OPEN because the Activity B will on top of the task. And if we want to customize the closing transition when finishing Activity B and back to Activity A, since B is still is above A, we should call this method in Activity B with overrideType = OVERRIDE_TRANSITION_CLOSE.

If an Activity has called this method, and it also set another activity animation by Window#setWindowAnimations(int), the system will choose the animation set from this method.

Note that Window#setWindowAnimations, overridePendingTransition(int,int) and this method will be ignored if the Activity is started with ActivityOptions#makeSceneTransitionAnimation(Activity, Pair[]). Also note that this method can only be used to customize cross-activity transitions but not cross-task transitions which are fully non-customizable as of Android 11.

Parameters
overrideType	Int: OVERRIDE_TRANSITION_OPEN This animation will be used when starting/entering an activity. OVERRIDE_TRANSITION_CLOSE This animation will be used when finishing/closing an activity. Value is android.app.Activity#OVERRIDE_TRANSITION_OPEN, or android.app.Activity#OVERRIDE_TRANSITION_CLOSE
enterAnim	Int: A resource ID of the animation resource to use for the incoming activity. Use 0 for no animation.
exitAnim	Int: A resource ID of the animation resource to use for the outgoing activity. Use 0 for no animation.

See Also

• #overrideActivityTransition(int, int, int, int)
• #clearOverrideActivityTransition(int)
• android.window.OnBackInvokedCallback
• #overridePendingTransition(int, int)
• android.view.Window#setWindowAnimations(int)
• android.app.ActivityOptions#makeSceneTransitionAnimation(Activity, Pair[])

overrideActivityTransition

Added in API level 34

open fun overrideActivityTransition(
    overrideType: Int, 
    enterAnim: Int, 
    exitAnim: Int, 
    backgroundColor: Int
): Unit

Customizes the animation for the activity transition with this activity. This can be called at any time while the activity still alive.

This is a more robust method of overriding the transition animation at runtime without relying on overridePendingTransition(int,int) which doesn't work for predictive back. However, the animation set from overridePendingTransition(int,int) still has higher priority when the system is looking for the next transition animation.

The animations resources set by this method will be chosen if and only if the activity is on top of the task while activity transitions are being played. For example, if we want to customize the opening transition when launching Activity B which gets started from Activity A, we should call this method inside B's onCreate with overrideType = OVERRIDE_TRANSITION_OPEN because the Activity B will on top of the task. And if we want to customize the closing transition when finishing Activity B and back to Activity A, since B is still is above A, we should call this method in Activity B with overrideType = OVERRIDE_TRANSITION_CLOSE.

If an Activity has called this method, and it also set another activity animation by Window#setWindowAnimations(int), the system will choose the animation set from this method.

Note that Window#setWindowAnimations, overridePendingTransition(int,int) and this method will be ignored if the Activity is started with ActivityOptions#makeSceneTransitionAnimation(Activity, Pair[]). Also note that this method can only be used to customize cross-activity transitions but not cross-task transitions which are fully non-customizable as of Android 11.

Parameters
overrideType	Int: OVERRIDE_TRANSITION_OPEN This animation will be used when starting/entering an activity. OVERRIDE_TRANSITION_CLOSE This animation will be used when finishing/closing an activity. Value is android.app.Activity#OVERRIDE_TRANSITION_OPEN, or android.app.Activity#OVERRIDE_TRANSITION_CLOSE
enterAnim	Int: A resource ID of the animation resource to use for the incoming activity. Use 0 for no animation.
exitAnim	Int: A resource ID of the animation resource to use for the outgoing activity. Use 0 for no animation.
backgroundColor	Int: The background color to use for the background during the animation if the animation requires a background. Set to Color#TRANSPARENT to not override the default color.

See Also

• #overrideActivityTransition(int, int, int)
• #clearOverrideActivityTransition(int)
• android.window.OnBackInvokedCallback
• #overridePendingTransition(int, int)
• android.view.Window#setWindowAnimations(int)
• android.app.ActivityOptions#makeSceneTransitionAnimation(Activity, Pair[])

overridePendingTransition

Added in API level 5
Deprecated in API level 34

open fun overridePendingTransition(
    enterAnim: Int, 
    exitAnim: Int
): Unit

Deprecated: Use overrideActivityTransition(int,int,int)} instead.

Call immediately after one of the flavors of #startActivity(android.content.Intent) or finish to specify an explicit transition animation to perform next.

As of android.os.Build.VERSION_CODES#JELLY_BEAN an alternative to using this with starting activities is to supply the desired animation information through a ActivityOptions bundle to #startActivity(android.content.Intent,android.os.Bundle) or a related function. This allows you to specify a custom animation even when starting an activity from outside the context of the current top activity.

Af of android.os.Build.VERSION_CODES#S application can only specify a transition animation when the transition happens within the same task. System default animation is used for cross-task transition animations.

Parameters
enterAnim	Int: A resource ID of the animation resource to use for the incoming activity. Use 0 for no animation.
exitAnim	Int: A resource ID of the animation resource to use for the outgoing activity. Use 0 for no animation.

overridePendingTransition

Added in API level 33
Deprecated in API level 34

open fun overridePendingTransition(
    enterAnim: Int, 
    exitAnim: Int, 
    backgroundColor: Int
): Unit

Deprecated: Use overrideActivityTransition(int,int,int,int)} instead.

Call immediately after one of the flavors of #startActivity(android.content.Intent) or finish to specify an explicit transition animation to perform next.

As of android.os.Build.VERSION_CODES#JELLY_BEAN an alternative to using this with starting activities is to supply the desired animation information through a ActivityOptions bundle to #startActivity(android.content.Intent,android.os.Bundle) or a related function. This allows you to specify a custom animation even when starting an activity from outside the context of the current top activity.

Parameters
enterAnim	Int: A resource ID of the animation resource to use for the incoming activity. Use 0 for no animation.
exitAnim	Int: A resource ID of the animation resource to use for the outgoing activity. Use 0 for no animation.
backgroundColor	Int: The background color to use for the background during the animation if the animation requires a background. Set to 0 to not override the default color.

postponeEnterTransition

Added in API level 21

open fun postponeEnterTransition(): Unit

Postpone the entering activity transition when Activity was started with android.app.ActivityOptions#makeSceneTransitionAnimation(Activity, * android.util.Pair[]).

This method gives the Activity the ability to delay starting the entering and shared element transitions until all data is loaded. Until then, the Activity won't draw into its window, leaving the window transparent. This may also cause the returning animation to be delayed until data is ready. This method should be called in onCreate(android.os.Bundle) or in onActivityReenter(int,android.content.Intent). startPostponedEnterTransition() must be called to allow the Activity to start the transitions. If the Activity did not use android.app.ActivityOptions#makeSceneTransitionAnimation(Activity, * android.util.Pair[]), then this method does nothing.

recreate

Added in API level 11

open fun recreate(): Unit

Cause this Activity to be recreated with a new instance. This results in essentially the same flow as when the Activity is created due to a configuration change -- the current instance will go through its lifecycle to onDestroy and a new instance then created after it.

registerActivityLifecycleCallbacks

Added in API level 29

open fun registerActivityLifecycleCallbacks(callback: Application.ActivityLifecycleCallbacks): Unit

Register an Application.ActivityLifecycleCallbacks instance that receives lifecycle callbacks for only this Activity.

In relation to any Application registered callbacks, the callbacks registered here will always occur nested within those callbacks. This means:

• Pre events will first be sent to Application registered callbacks, then to callbacks registered here.
• Application.ActivityLifecycleCallbacks#onActivityCreated(Activity, Bundle), Application.ActivityLifecycleCallbacks#onActivityStarted(Activity), and Application.ActivityLifecycleCallbacks#onActivityResumed(Activity) will be sent first to Application registered callbacks, then to callbacks registered here. For all other events, callbacks registered here will be sent first.
• Post events will first be sent to callbacks registered here, then to Application registered callbacks.

If multiple callbacks are registered here, they receive events in a first in (up through Application.ActivityLifecycleCallbacks#onActivityPostResumed, last out ordering.

It is strongly recommended to register this in the constructor of your Activity to ensure you get all available callbacks. As this callback is associated with only this Activity, it is not usually necessary to unregister it unless you specifically do not want to receive further lifecycle callbacks.

Parameters
callback	Application.ActivityLifecycleCallbacks: The callback instance to register This value cannot be null.

registerComponentCallbacks

Added in API level 14

open fun registerComponentCallbacks(callback: ComponentCallbacks!): Unit

Parameters
callback	ComponentCallbacks!: The interface to call. This can be either a ComponentCallbacks or ComponentCallbacks2 interface.

Exceptions
java.lang.IllegalStateException	if this method calls before attachBaseContext(android.content.Context)

registerForContextMenu

Added in API level 1

open fun registerForContextMenu(view: View!): Unit

Registers a context menu to be shown for the given view (multiple views can show the context menu). This method will set the OnCreateContextMenuListener on the view to this activity, so onCreateContextMenu(android.view.ContextMenu,android.view.View,android.view.ContextMenu.ContextMenuInfo) will be called when it is time to show the context menu.

Parameters
view	View!: The view that should show a context menu.

See Also

• #unregisterForContextMenu(View)

registerScreenCaptureCallback

Added in API level 34

open fun registerScreenCaptureCallback(
    executor: Executor, 
    callback: Activity.ScreenCaptureCallback
): Unit

Registers a screen capture callback for this activity. The callback will be triggered when a screen capture of this activity is attempted. This callback will be executed on the thread of the passed executor. For details, see ScreenCaptureCallback#onScreenCaptured.
Requires android.Manifest.permission#DETECT_SCREEN_CAPTURE

Parameters
executor	Executor: This value cannot be null. Callback and listener events are dispatched through this Executor, providing an easy way to control which thread is used. To dispatch events through the main thread of your application, you can use Context.getMainExecutor(). Otherwise, provide an Executor that dispatches to an appropriate thread.
callback	Activity.ScreenCaptureCallback: This value cannot be null.

releaseInstance

Added in API level 21

open fun releaseInstance(): Boolean

Ask that the local app instance of this activity be released to free up its memory. This is asking for the activity to be destroyed, but does not finish the activity -- a new instance of the activity will later be re-created if needed due to the user navigating back to it.

Return
Boolean	Returns true if the activity was in a state that it has started the process of destroying its current instance; returns false if for any reason this could not be done: it is currently visible to the user, it is already being destroyed, it is being finished, it hasn't yet saved its state, etc.

removeDialog

Added in API level 1
Deprecated in API level 15

fun removeDialog(id: Int): Unit

Deprecated: Use the new DialogFragment class with FragmentManager instead; this is also available on older platforms through the Android compatibility package.

Removes any internal references to a dialog managed by this Activity. If the dialog is showing, it will dismiss it as part of the clean up.

This can be useful if you know that you will never show a dialog again and want to avoid the overhead of saving and restoring it in the future.

As of android.os.Build.VERSION_CODES#GINGERBREAD, this function will not throw an exception if you try to remove an ID that does not currently have an associated dialog.

Parameters
id	Int: The id of the managed dialog.

See Also

• #onCreateDialog(int, Bundle)
• #onPrepareDialog(int, Dialog, Bundle)
• #showDialog(int)
• #dismissDialog(int)

reportFullyDrawn

Added in API level 19

open fun reportFullyDrawn(): Unit

Report to the system that your app is now fully drawn, for diagnostic and optimization purposes. The system may adjust optimizations to prioritize work that happens before reportFullyDrawn is called, to improve app startup. Misrepresenting the startup window by calling reportFullyDrawn too late or too early may decrease application and startup performance.

This is also used to help instrument application launch times, so that the app can report when it is fully in a usable state; without this, the only thing the system itself can determine is the point at which the activity's window is first drawn and displayed. To participate in app launch time measurement, you should always call this method after first launch (when onCreate(android.os.Bundle) is called), at the point where you have entirely drawn your UI and populated with all of the significant data. You can safely call this method any time after first launch as well, in which case it will simply be ignored.

If this method is called before the activity's window is first drawn and displayed as measured by the system, the reported time here will be shifted to the system measured time.

requestDragAndDropPermissions

Added in API level 24

open fun requestDragAndDropPermissions(event: DragEvent!): DragAndDropPermissions!

Create DragAndDropPermissions object bound to this activity and controlling the access permissions for content URIs associated with the DragEvent.

Parameters
event	DragEvent!: Drag event

Return
DragAndDropPermissions!	The DragAndDropPermissions object used to control access to the content URIs. Null if no content URIs are associated with the event or if permissions could not be granted.

requestFullscreenMode

Added in API level 34

open fun requestFullscreenMode(
    request: Int, 
    approvalCallback: OutcomeReceiver<Void!, Throwable!>?
): Unit

Request to put the activity into fullscreen. The requester must be pinned or the top-most activity of the focused display which can be verified using onTopResumedActivityChanged(boolean). The request should also be a response to a user input. When getting fullscreen and receiving corresponding onConfigurationChanged(android.content.res.Configuration) and onMultiWindowModeChanged(boolean,android.content.res.Configuration), the activity should relayout itself and the system bars' visibilities can be controlled as usual fullscreen apps. Calling it again with the exit request can restore the activity to the previous status. This will only happen when it got into fullscreen through this API.

Parameters
request	Int: Can be FULLSCREEN_MODE_REQUEST_ENTER or FULLSCREEN_MODE_REQUEST_EXIT to indicate this request is to get fullscreen or get restored. Value is android.app.Activity#FULLSCREEN_MODE_REQUEST_EXIT, or android.app.Activity#FULLSCREEN_MODE_REQUEST_ENTER
approvalCallback	OutcomeReceiver<Void!, Throwable!>?: Optional callback, use null when not necessary. When the request is approved or rejected, the callback will be triggered. This will happen before any configuration change. The callback will be dispatched on the main thread. If the request is rejected, the Throwable provided will be an IllegalStateException with a detailed message can be retrieved by Throwable#getMessage().

requestPermissions

Added in API level 23

fun requestPermissions(
    permissions: Array<String!>, 
    requestCode: Int
): Unit

Requests permissions to be granted to this application. These permissions must be requested in your manifest, they should not be granted to your app, and they should have protection level dangerous, regardless whether they are declared by the platform or a third-party app.

Normal permissions android.content.pm.PermissionInfo#PROTECTION_NORMAL are granted at install time if requested in the manifest. Signature permissions android.content.pm.PermissionInfo#PROTECTION_SIGNATURE are granted at install time if requested in the manifest and the signature of your app matches the signature of the app declaring the permissions.

Call #shouldShowRequestPermissionRationale before calling this API to check if the system recommends to show a rationale UI before asking for a permission.

If your app does not have the requested permissions the user will be presented with UI for accepting them. After the user has accepted or rejected the requested permissions you will receive a callback on #onRequestPermissionsResult reporting whether the permissions were granted or not.

Note that requesting a permission does not guarantee it will be granted and your app should be able to run without having this permission.

This method may start an activity allowing the user to choose which permissions to grant and which to reject. Hence, you should be prepared that your activity may be paused and resumed. Further, granting some permissions may require a restart of you application. In such a case, the system will recreate the activity stack before delivering the result to #onRequestPermissionsResult.

When checking whether you have a permission you should use checkSelfPermission(java.lang.String).

You cannot request a permission if your activity sets noHistory to true because in this case the activity would not receive result callbacks including #onRequestPermissionsResult.

The permissions samples repo demonstrates how to use this method to request permissions at run time.

Parameters
permissions	Array<String!>: The requested permissions. Must be non-null and not empty.
requestCode	Int: Application specific request code to match with a result reported to #onRequestPermissionsResult. Should be >= 0.

Exceptions
java.lang.IllegalArgumentException	if requestCode is negative.

See Also

• #checkSelfPermission

requestPermissions

Added in API level 35

fun requestPermissions(
    permissions: Array<String!>, 
    requestCode: Int, 
    deviceId: Int
): Unit

Requests permissions to be granted to this application. These permissions must be requested in your manifest, they should not be granted to your app, and they should have protection level dangerous, regardless whether they are declared by the platform or a third-party app.

Normal permissions android.content.pm.PermissionInfo#PROTECTION_NORMAL are granted at install time if requested in the manifest. Signature permissions android.content.pm.PermissionInfo#PROTECTION_SIGNATURE are granted at install time if requested in the manifest and the signature of your app matches the signature of the app declaring the permissions.

Call #shouldShowRequestPermissionRationale before calling this API to check if the system recommends to show a rationale UI before asking for a permission.

If your app does not have the requested permissions the user will be presented with UI for accepting them. After the user has accepted or rejected the requested permissions you will receive a callback on #onRequestPermissionsResult reporting whether the permissions were granted or not.

Note that requesting a permission does not guarantee it will be granted and your app should be able to run without having this permission.

This method may start an activity allowing the user to choose which permissions to grant and which to reject. Hence, you should be prepared that your activity may be paused and resumed. Further, granting some permissions may require a restart of you application. In such a case, the system will recreate the activity stack before delivering the result to #onRequestPermissionsResult.

When checking whether you have a permission you should use checkSelfPermission(java.lang.String).

You cannot request a permission if your activity sets noHistory to true because in this case the activity would not receive result callbacks including #onRequestPermissionsResult.

The permissions samples repo demonstrates how to use this method to request permissions at run time.

Parameters
permissions	Array<String!>: The requested permissions. Must be non-null and not empty.
requestCode	Int: Application specific request code to match with a result reported to #onRequestPermissionsResult. Should be >= 0.
deviceId	Int: The app is requesting permissions for this device. The primary/physical device is assigned Context#DEVICE_ID_DEFAULT, and virtual devices are assigned unique device Ids.

Exceptions
java.lang.IllegalArgumentException	if requestCode is negative.

See Also

• #checkSelfPermission
• android.content.Context#DEVICE_ID_DEFAULT

requestShowKeyboardShortcuts

Added in API level 24

fun requestShowKeyboardShortcuts(): Unit

Request the Keyboard Shortcuts screen to show up. This will trigger onProvideKeyboardShortcuts to retrieve the shortcuts for the foreground activity.

requestVisibleBehind

Added in API level 21
Deprecated in API level 26

open fun requestVisibleBehind(visible: Boolean): Boolean

Deprecated: This method's functionality is no longer supported as of android.os.Build.VERSION_CODES#O and will be removed in a future release.

Activities that want to remain visible behind a translucent activity above them must call this method anytime between the start of onResume() and the return from onPause(). If this call is successful then the activity will remain visible after onPause() is called, and is allowed to continue playing media in the background.

The actions of this call are reset each time that this activity is brought to the front. That is, every time onResume() is called the activity will be assumed to not have requested visible behind. Therefore, if you want this activity to continue to be visible in the background you must call this method again.

Only fullscreen opaque activities may make this call. I.e. this call is a nop for dialog and translucent activities.

Under all circumstances, the activity must stop playing and release resources prior to or within a call to onVisibleBehindCanceled() or if this call returns false.

False will be returned any time this method is called between the return of onPause and the next call to onResume.

Parameters
visible	Boolean: true to notify the system that the activity wishes to be visible behind other translucent activities, false to indicate otherwise. Resources must be released when passing false to this method.

Return

Boolean

the resulting visibiity state. If true the activity will remain visible beyond onPause() if the next activity is translucent or not fullscreen. If false then the activity may not count on being visible behind other translucent activities, and must stop any media playback and release resources. Returning false may occur in lieu of a call to onVisibleBehindCanceled() so the return value must be checked.

See Also

• #onVisibleBehindCanceled()

requestWindowFeature

Added in API level 1

fun requestWindowFeature(featureId: Int): Boolean

Enable extended window features. This is a convenience for calling getWindow().requestFeature().

Parameters
featureId	Int: The desired feature as defined in android.view.Window.

Return
Boolean	Returns true if the requested feature is supported and now enabled.

See Also

• android.view.Window#requestFeature

requireViewById

Added in API level 28

fun <T : View!> requireViewById(id: Int): T

Finds a view that was identified by the android:id XML attribute that was processed in #onCreate, or throws an IllegalArgumentException if the ID is invalid, or there is no matching view in the hierarchy.

Note: In most cases -- depending on compiler support -- the resulting view is automatically cast to the target class type. If the target class type is unconstrained, an explicit cast may be necessary.

Parameters
id	Int: the ID to search for

Return
T	a view with given ID This value cannot be null.

See Also

• android.view.View#requireViewById(int)
• android.app.Activity#findViewById(int)

runOnUiThread

Added in API level 1

fun runOnUiThread(action: Runnable!): Unit

Runs the specified action on the UI thread. If the current thread is the UI thread, then the action is executed immediately. If the current thread is not the UI thread, the action is posted to the event queue of the UI thread.

Parameters
action	Runnable!: the action to run on the UI thread

setActionBar

Added in API level 21

open fun setActionBar(toolbar: Toolbar?): Unit

Set a Toolbar to act as the ActionBar for this Activity window.

When set to a non-null value the getActionBar() method will return an ActionBar object that can be used to control the given toolbar as if it were a traditional window decor action bar. The toolbar's menu will be populated with the Activity's options menu and the navigation button will be wired through the standard home menu select action.

In order to use a Toolbar within the Activity's window content the application must not request the window feature FEATURE_ACTION_BAR.

Parameters
toolbar	Toolbar?: Toolbar to set as the Activity's action bar, or null to clear it

setAllowCrossUidActivitySwitchFromBelow

Added in API level 35

open fun setAllowCrossUidActivitySwitchFromBelow(allowed: Boolean): Unit

Specifies whether the activities below this one in the task can also start other activities or finish the task.

Starting from Target SDK Level android.os.Build.VERSION_CODES#VANILLA_ICE_CREAM, apps may be blocked from starting new activities or finishing their task unless the top activity of such task belong to the same UID for security reasons.

Setting this flag to true will allow the launching app to ignore the restriction if this activity is on top. Apps matching the UID of this activity are always exempt.

Parameters
allowed	Boolean: true to disable the UID restrictions; false to revert back to the default behaviour

setContentTransitionManager

Added in API level 21

open fun setContentTransitionManager(tm: TransitionManager!): Unit

Set the TransitionManager to use for default transitions in this window. Requires Window#FEATURE_CONTENT_TRANSITIONS.

Parameters
tm	TransitionManager!: The TransitionManager to use for scene changes.

setContentView

Added in API level 1

open fun setContentView(layoutResID: Int): Unit

Set the activity content from a layout resource. The resource will be inflated, adding all top-level views to the activity.

Parameters
layoutResID	Int: Resource ID to be inflated.

See Also

• #setContentView(android.view.View)
• #setContentView(android.view.View, android.view.ViewGroup.LayoutParams)

setContentView

Added in API level 1

open fun setContentView(view: View!): Unit

Set the activity content to an explicit view. This view is placed directly into the activity's view hierarchy. It can itself be a complex view hierarchy. When calling this method, the layout parameters of the specified view are ignored. Both the width and the height of the view are set by default to ViewGroup.LayoutParams#MATCH_PARENT. To use your own layout parameters, invoke setContentView(android.view.View,android.view.ViewGroup.LayoutParams) instead.

Parameters
view	View!: The desired content to display.

See Also

• #setContentView(int)
• #setContentView(android.view.View, android.view.ViewGroup.LayoutParams)

setContentView

Added in API level 1

open fun setContentView(
    view: View!, 
    params: ViewGroup.LayoutParams!
): Unit

Set the activity content to an explicit view. This view is placed directly into the activity's view hierarchy. It can itself be a complex view hierarchy.

Parameters
view	View!: The desired content to display.
params	ViewGroup.LayoutParams!: Layout parameters for the view.

See Also

• #setContentView(android.view.View)
• #setContentView(int)

setDefaultKeyMode

Added in API level 1

fun setDefaultKeyMode(mode: Int): Unit

Select the default key handling for this activity. This controls what will happen to key events that are not otherwise handled. The default mode (DEFAULT_KEYS_DISABLE) will simply drop them on the floor. Other modes allow you to launch the dialer (DEFAULT_KEYS_DIALER), execute a shortcut in your options menu without requiring the menu key be held down (DEFAULT_KEYS_SHORTCUT), or launch a search (DEFAULT_KEYS_SEARCH_LOCAL and DEFAULT_KEYS_SEARCH_GLOBAL).

Note that the mode selected here does not impact the default handling of system keys, such as the "back" and "menu" keys, and your activity and its views always get a first chance to receive and handle all application keys.

Parameters
mode	Int: The desired default key mode constant. Value is android.app.Activity#DEFAULT_KEYS_DISABLE, android.app.Activity#DEFAULT_KEYS_DIALER, android.app.Activity#DEFAULT_KEYS_SHORTCUT, android.app.Activity#DEFAULT_KEYS_SEARCH_LOCAL, or android.app.Activity#DEFAULT_KEYS_SEARCH_GLOBAL

See Also

• #onKeyDown

setEnterSharedElementCallback

Added in API level 21

open fun setEnterSharedElementCallback(callback: SharedElementCallback!): Unit

When android.app.ActivityOptions#makeSceneTransitionAnimation(Activity, * android.view.View, String) was used to start an Activity, callback will be called to handle shared elements on the launched Activity. This requires Window#FEATURE_ACTIVITY_TRANSITIONS.

Parameters
callback	SharedElementCallback!: Used to manipulate shared element transitions on the launched Activity.

setExitSharedElementCallback

Added in API level 21

open fun setExitSharedElementCallback(callback: SharedElementCallback!): Unit

When android.app.ActivityOptions#makeSceneTransitionAnimation(Activity, * android.view.View, String) was used to start an Activity, callback will be called to handle shared elements on the launching Activity. Most calls will only come when returning from the started Activity. This requires Window#FEATURE_ACTIVITY_TRANSITIONS.

Parameters
callback	SharedElementCallback!: Used to manipulate shared element transitions on the launching Activity.

setFeatureDrawable

Added in API level 1

fun setFeatureDrawable(
    featureId: Int, 
    drawable: Drawable!
): Unit

Convenience for calling android.view.Window#setFeatureDrawable(int, Drawable).

setFeatureDrawableAlpha

Added in API level 1

fun setFeatureDrawableAlpha(
    featureId: Int, 
    alpha: Int
): Unit

Convenience for calling android.view.Window#setFeatureDrawableAlpha.

setFeatureDrawableResource

Added in API level 1

fun setFeatureDrawableResource(
    featureId: Int, 
    resId: Int
): Unit

Convenience for calling android.view.Window#setFeatureDrawableResource.

setFeatureDrawableUri

Added in API level 1

fun setFeatureDrawableUri(
    featureId: Int, 
    uri: Uri!
): Unit

Convenience for calling android.view.Window#setFeatureDrawableUri.

setFinishOnTouchOutside

Added in API level 11

open fun setFinishOnTouchOutside(finish: Boolean): Unit

Sets whether this activity is finished when touched outside its window's bounds.

setImmersive

Added in API level 18

open fun setImmersive(i: Boolean): Unit

Adjust the current immersive mode setting. Note that changing this value will have no effect on the activity's android.content.pm.ActivityInfo structure; that is, if android:immersive is set to true in the application's manifest entry for this activity, the ActivityInfo.flags member will always have its FLAG_IMMERSIVE bit set.

See Also

• #isImmersive()
• android.content.pm.ActivityInfo#FLAG_IMMERSIVE

setInheritShowWhenLocked

Added in API level 29

open fun setInheritShowWhenLocked(inheritShowWhenLocked: Boolean): Unit

Specifies whether this Activity should be shown on top of the lock screen whenever the lockscreen is up and this activity has another activity behind it with the showWhenLock attribute set. That is, this activity is only visible on the lock screen if there is another activity with the showWhenLock attribute visible at the same time on the lock screen. A use case for this is permission dialogs, that should only be visible on the lock screen if their requesting activity is also visible. This value can be set as a manifest attribute using android.R.attr#inheritShowWhenLocked.

Parameters
inheritShowWhenLocked	Boolean: true to show the Activity on top of the lock screen when this activity has another activity behind it with the showWhenLock attribute set; false otherwise.

See Also

• #setShowWhenLocked(boolean)
• android.R.attr#inheritShowWhenLocked

setIntent

Added in API level 1

open fun setIntent(newIntent: Intent!): Unit

Changes the intent returned by getIntent. This holds a reference to the given intent; it does not copy it. Often used in conjunction with onNewIntent(android.content.Intent).

Parameters
newIntent	Intent!: The new Intent object to return from getIntent

See Also

• #getIntent
• #onNewIntent(Intent)

setIntent

Added in API level 35

open fun setIntent(
    newIntent: Intent?, 
    newCaller: ComponentCaller?
): Unit

Changes the intent returned by getIntent, and ComponentCaller returned by getCaller. This holds references to the given intent, and ComponentCaller; it does not copy them. Often used in conjunction with onNewIntent(android.content.Intent). To retrieve the caller from onNewIntent(android.content.Intent), use getCurrentCaller, otherwise override onNewIntent(android.content.Intent,android.app.ComponentCaller).

Parameters
newIntent	Intent?: The new Intent object to return from getIntent This value may be null.
newCaller	ComponentCaller?: The new ComponentCaller object to return from getCaller This value may be null.

See Also

• #getIntent
• #onNewIntent(Intent, ComponentCaller)
• #getCaller

setLocusContext

Added in API level 30

open fun setLocusContext(
    locusId: LocusId?, 
    bundle: Bundle?
): Unit

Sets the android.content.LocusId for this activity. The locus id helps identify different instances of the same Activity class.

For example, a locus id based on a specific conversation could be set on a conversation app's chat Activity. The system can then use this locus id along with app's contents to provide ranking signals in various UI surfaces including sharing, notifications, shortcuts and so on.

It is recommended to set the same locus id in the shortcut's locus id using setLocusId so that the system can learn appropriate ranking signals linking the activity's locus id with the matching shortcut.

Parameters
locusId	LocusId?: a unique, stable id that identifies this Activity instance. LocusId is an opaque ID that links this Activity's state to different Android concepts: setLocusId. LocusID is null by default or if you explicitly reset it.
bundle	Bundle?: extras set or updated as part of this locus context. This may help provide additional metadata such as URLs, conversation participants specific to this Activity's context. Bundle can be null if additional metadata is not needed. Bundle should always be null for null locusId.

See Also

• android.view.contentcapture.ContentCaptureManager
• android.view.contentcapture.ContentCaptureContext

setMediaController

Added in API level 21

fun setMediaController(controller: MediaController!): Unit

Sets a MediaController to send media keys and volume changes to.

The controller will be tied to the window of this Activity. Media key and volume events which are received while the Activity is in the foreground will be forwarded to the controller and used to invoke transport controls or adjust the volume. This may be used instead of or in addition to setVolumeControlStream to affect a specific session instead of a specific stream.

It is not guaranteed that the hardware volume controls will always change this session's volume (for example, if a call is in progress, its stream's volume may be changed instead). To reset back to the default use null as the controller.

Parameters
controller	MediaController!: The controller for the session which should receive media keys and volume changes.

setPictureInPictureParams

Added in API level 26

open fun setPictureInPictureParams(params: PictureInPictureParams): Unit

Updates the properties of the picture-in-picture activity, or sets it to be used later when enterPictureInPictureMode() is called.

Parameters
params	PictureInPictureParams: the new parameters for the picture-in-picture. This value cannot be null.

setProgress

Added in API level 1
Deprecated in API level 24

fun setProgress(progress: Int): Unit

Deprecated: No longer supported starting in API 21.

Sets the progress for the progress bars in the title.

In order for the progress bar to be shown, the feature must be requested via requestWindowFeature(int).

Parameters
progress	Int: The progress for the progress bar. Valid ranges are from 0 to 10000 (both inclusive). If 10000 is given, the progress bar will be completely filled and will fade out.

setProgressBarIndeterminate

Added in API level 1
Deprecated in API level 24

fun setProgressBarIndeterminate(indeterminate: Boolean): Unit

Deprecated: No longer supported starting in API 21.

Sets whether the horizontal progress bar in the title should be indeterminate (the circular is always indeterminate).

In order for the progress bar to be shown, the feature must be requested via requestWindowFeature(int).

Parameters
indeterminate	Boolean: Whether the horizontal progress bar should be indeterminate.

setProgressBarIndeterminateVisibility

Added in API level 1
Deprecated in API level 24

fun setProgressBarIndeterminateVisibility(visible: Boolean): Unit

Deprecated: No longer supported starting in API 21.

Sets the visibility of the indeterminate progress bar in the title.

In order for the progress bar to be shown, the feature must be requested via requestWindowFeature(int).

Parameters
visible	Boolean: Whether to show the progress bars in the title.

setProgressBarVisibility

Added in API level 1
Deprecated in API level 24

fun setProgressBarVisibility(visible: Boolean): Unit

Deprecated: No longer supported starting in API 21.

Sets the visibility of the progress bar in the title.

In order for the progress bar to be shown, the feature must be requested via requestWindowFeature(int).

Parameters
visible	Boolean: Whether to show the progress bars in the title.

setRecentsScreenshotEnabled

Added in API level 33

open fun setRecentsScreenshotEnabled(enabled: Boolean): Unit

If set to false, this indicates to the system that it should never take a screenshot of the activity to be used as a representation in recents screen. By default, this value is true.

Note that the system may use the window background of the theme instead to represent the window when it is not running.

Also note that in comparison to android.view.WindowManager.LayoutParams#FLAG_SECURE, this only affects the behavior when the activity's screenshot would be used as a representation when the activity is not in a started state, i.e. in Overview. The system may still take screenshots of the activity in other contexts; for example, when the user takes a screenshot of the entire screen, or when the active android.service.voice.VoiceInteractionService requests a screenshot via android.service.voice.VoiceInteractionSession#SHOW_WITH_SCREENSHOT.

Parameters
enabled	Boolean: true to enable recents screenshots; false otherwise.

setRequestedOrientation

Added in API level 1

open fun setRequestedOrientation(requestedOrientation: Int): Unit

Change the desired orientation of this activity. If the activity is currently in the foreground or otherwise impacting the screen orientation, the screen will immediately be changed (possibly causing the activity to be restarted). Otherwise, this will be used the next time the activity is visible. Note: Device manufacturers can configure devices to override (ignore) calls to this method to improve the layout of orientation-restricted apps. See Device compatibility mode.

Parameters

requestedOrientation

Int: An orientation constant as used in ActivityInfo.screenOrientation. Value is android.content.pm.ActivityInfo.SCREEN_ORIENTATION_UNSET, android.content.pm.ActivityInfo#SCREEN_ORIENTATION_UNSPECIFIED, android.content.pm.ActivityInfo#SCREEN_ORIENTATION_LANDSCAPE, android.content.pm.ActivityInfo#SCREEN_ORIENTATION_PORTRAIT, android.content.pm.ActivityInfo#SCREEN_ORIENTATION_USER, android.content.pm.ActivityInfo#SCREEN_ORIENTATION_BEHIND, android.content.pm.ActivityInfo#SCREEN_ORIENTATION_SENSOR, android.content.pm.ActivityInfo#SCREEN_ORIENTATION_NOSENSOR, android.content.pm.ActivityInfo#SCREEN_ORIENTATION_SENSOR_LANDSCAPE, android.content.pm.ActivityInfo#SCREEN_ORIENTATION_SENSOR_PORTRAIT, android.content.pm.ActivityInfo#SCREEN_ORIENTATION_REVERSE_LANDSCAPE, android.content.pm.ActivityInfo#SCREEN_ORIENTATION_REVERSE_PORTRAIT, android.content.pm.ActivityInfo#SCREEN_ORIENTATION_FULL_SENSOR, android.content.pm.ActivityInfo#SCREEN_ORIENTATION_USER_LANDSCAPE, android.content.pm.ActivityInfo#SCREEN_ORIENTATION_USER_PORTRAIT, android.content.pm.ActivityInfo#SCREEN_ORIENTATION_FULL_USER, or android.content.pm.ActivityInfo#SCREEN_ORIENTATION_LOCKED

setResult

Added in API level 1

fun setResult(resultCode: Int): Unit

Call this to set the result that your activity will return to its caller.

Parameters
resultCode	Int: The result code to propagate back to the originating activity, often RESULT_CANCELED or RESULT_OK

See Also

• #RESULT_CANCELED
• #RESULT_OK
• #RESULT_FIRST_USER
• #setResult(int, Intent)

setResult

Added in API level 1

fun setResult(
    resultCode: Int, 
    data: Intent!
): Unit

Call this to set the result that your activity will return to its caller.

As of android.os.Build.VERSION_CODES#GINGERBREAD, the Intent you supply here can have Intent.FLAG_GRANT_READ_URI_PERMISSION and/or Intent.FLAG_GRANT_WRITE_URI_PERMISSION set. This will grant the Activity receiving the result access to the specific URIs in the Intent. Access will remain until the Activity has finished (it will remain across the hosting process being killed and other temporary destruction) and will be added to any existing set of URI permissions it already holds.

Parameters
resultCode	Int: The result code to propagate back to the originating activity, often RESULT_CANCELED or RESULT_OK
data	Intent!: The data to propagate back to the originating activity.

See Also

• #RESULT_CANCELED
• #RESULT_OK
• #RESULT_FIRST_USER
• #setResult(int)

setSecondaryProgress

Added in API level 1
Deprecated in API level 24

fun setSecondaryProgress(secondaryProgress: Int): Unit

Deprecated: No longer supported starting in API 21.

Sets the secondary progress for the progress bar in the title. This progress is drawn between the primary progress (set via setProgress(int) and the background. It can be ideal for media scenarios such as showing the buffering progress while the default progress shows the play progress.

In order for the progress bar to be shown, the feature must be requested via requestWindowFeature(int).

Parameters
secondaryProgress	Int: The secondary progress for the progress bar. Valid ranges are from 0 to 10000 (both inclusive).

setShouldDockBigOverlays

Added in API level 33

open fun setShouldDockBigOverlays(shouldDockBigOverlays: Boolean): Unit

Specifies a preference to dock big overlays like the expanded picture-in-picture on TV (see PictureInPictureParams.Builder#setExpandedAspectRatio). Docking puts the big overlay side-by-side next to this activity, so that both windows are fully visible to the user.

If unspecified, whether the overlay window will be docked or not, will be defined by the system.

If specified, the system will try to respect the preference, but it may be overridden by a user preference.

Parameters
shouldDockBigOverlays	Boolean: indicates that big overlays should be docked next to the activity instead of overlay its content

See Also

• android.app.PictureInPictureParams.Builder#setExpandedAspectRatio
• #shouldDockBigOverlays

setShowWhenLocked

Added in API level 27

open fun setShowWhenLocked(showWhenLocked: Boolean): Unit

Specifies whether an Activity should be shown on top of the lock screen whenever the lockscreen is up and the activity is resumed. Normally an activity will be transitioned to the stopped state if it is started while the lockscreen is up, but with this flag set the activity will remain in the resumed state visible on-top of the lock screen. This value can be set as a manifest attribute using android.R.attr#showWhenLocked.

Parameters
showWhenLocked	Boolean: true to show the Activity on top of the lock screen; false otherwise.

See Also

• #setTurnScreenOn(boolean)
• android.R.attr#turnScreenOn
• android.R.attr#showWhenLocked

setTaskDescription

Added in API level 21

open fun setTaskDescription(taskDescription: ActivityManager.TaskDescription!): Unit

Sets information describing the task with this activity for presentation inside the Recents System UI. When ActivityManager#getRecentTasks is called, the activities of each task are traversed in order from the topmost activity to the bottommost. The traversal continues for each property until a suitable value is found. For each task the taskDescription will be returned in android.app.ActivityManager.TaskDescription.

Parameters
taskDescription	ActivityManager.TaskDescription!: The TaskDescription properties that describe the task with this activity

See Also

• android.app.ActivityManager#getRecentTasks
• android.app.ActivityManager.TaskDescription

setTheme

Added in API level 1

open fun setTheme(resid: Int): Unit

Parameters
resid	Int: The style resource describing the theme.

setTitle

Added in API level 1

open fun setTitle(title: CharSequence!): Unit

Change the title associated with this activity. If this is a top-level activity, the title for its window will change. If it is an embedded activity, the parent can do whatever it wants with it.

setTitle

Added in API level 1

open fun setTitle(titleId: Int): Unit

Change the title associated with this activity. If this is a top-level activity, the title for its window will change. If it is an embedded activity, the parent can do whatever it wants with it.

setTitleColor

Added in API level 1
Deprecated in API level 21

open fun setTitleColor(textColor: Int): Unit

Deprecated: Use action bar styles instead.

Change the color of the title associated with this activity.

This method is deprecated starting in API Level 11 and replaced by action bar styles. For information on styling the Action Bar, read the Action Bar developer guide.

setTranslucent

Added in API level 30

open fun setTranslucent(translucent: Boolean): Boolean

Convert an activity, which particularly with android.R.attr#windowIsTranslucent or android.R.attr#windowIsFloating attribute, to a fullscreen opaque activity, or convert it from opaque back to translucent.

Parameters
translucent	Boolean: true convert from opaque to translucent. false convert from translucent to opaque.

Return
Boolean	The result of setting translucency. Return true if set successfully, false otherwise.

setTurnScreenOn

Added in API level 27

open fun setTurnScreenOn(turnScreenOn: Boolean): Unit

Specifies whether the screen should be turned on when the Activity is resumed. Normally an activity will be transitioned to the stopped state if it is started while the screen if off, but with this flag set the activity will cause the screen to turn on if the activity will be visible and resumed due to the screen coming on. The screen will not be turned on if the activity won't be visible after the screen is turned on. This flag is normally used in conjunction with the android.R.attr#showWhenLocked flag to make sure the activity is visible after the screen is turned on when the lockscreen is up. In addition, if this flag is set and the activity calls android.app.KeyguardManager#requestDismissKeyguard(android.app.Activity,android.app.KeyguardManager.KeyguardDismissCallback) the screen will turn on.

Parameters
turnScreenOn	Boolean: true to turn on the screen; false otherwise.

See Also

• #setShowWhenLocked(boolean)
• android.R.attr#turnScreenOn
• android.R.attr#showWhenLocked
• android.app.KeyguardManager#isDeviceSecure()

setVisible

Added in API level 3

open fun setVisible(visible: Boolean): Unit

Control whether this activity's main window is visible. This is intended only for the special case of an activity that is not going to show a UI itself, but can't just finish prior to onResume() because it needs to wait for a service binding or such. Setting this to false allows you to prevent your UI from being shown during that time.

The default value for this is taken from the android.R.attr#windowNoDisplay attribute of the activity's theme.

setVolumeControlStream

Added in API level 1

fun setVolumeControlStream(streamType: Int): Unit

Suggests an audio stream whose volume should be changed by the hardware volume controls.

The suggested audio stream will be tied to the window of this Activity. Volume requests which are received while the Activity is in the foreground will affect this stream.

It is not guaranteed that the hardware volume controls will always change this stream's volume (for example, if a call is in progress, its stream's volume may be changed instead). To reset back to the default, use AudioManager#USE_DEFAULT_STREAM_TYPE.

Parameters
streamType	Int: The type of the audio stream whose volume should be changed by the hardware volume controls.

setVrModeEnabled

Added in API level 24

open fun setVrModeEnabled(
    enabled: Boolean, 
    requestedComponent: ComponentName
): Unit

Enable or disable virtual reality (VR) mode for this Activity.

VR mode is a hint to Android system to switch to a mode optimized for VR applications while this Activity has user focus.

It is recommended that applications additionally declare android.R.attr#enableVrMode in their manifest to allow for smooth activity transitions when switching between VR activities.

If the requested android.service.vr.VrListenerService component is not available, VR mode will not be started. Developers can handle this case as follows:

String servicePackage = "com.whatever.app";
  String serviceClass = "com.whatever.app.MyVrListenerService";
 
  // Name of the component of the VrListenerService to start.
  ComponentName serviceComponent = new ComponentName(servicePackage, serviceClass);
 
  try {
     setVrModeEnabled(true, myComponentName);
  } catch (PackageManager.NameNotFoundException e) {
         List<ApplicationInfo> installed = getPackageManager().getInstalledApplications(0);
         boolean isInstalled = false;
         for (ApplicationInfo app : installed) {
             if (app.packageName.equals(servicePackage)) {
                 isInstalled = true;
                 break;
             }
         }
         if (isInstalled) {
             // Package is installed, but not enabled in Settings.  Let user enable it.
             startActivity(new Intent(Settings.ACTION_VR_LISTENER_SETTINGS));
         } else {
             // Package is not installed.  Send an intent to download this.
             sentIntentToLaunchAppStore(servicePackage);
         }
  }
  

Parameters
enabled	Boolean: true to enable this mode.
requestedComponent	ComponentName: the name of the component to use as a android.service.vr.VrListenerService while VR mode is enabled. This value cannot be null.

Exceptions
android.content.pm.PackageManager.NameNotFoundException	if the given component to run as a android.service.vr.VrListenerService is not installed, or has not been enabled in user settings.

See Also

• android.content.pm.PackageManager#FEATURE_VR_MODE_HIGH_PERFORMANCE
• android.service.vr.VrListenerService
• android.provider.Settings#ACTION_VR_LISTENER_SETTINGS
• android.R.attr#enableVrMode

shouldDockBigOverlays

Added in API level 33

open fun shouldDockBigOverlays(): Boolean

Returns whether big overlays should be docked next to the activity as set by setShouldDockBigOverlays.

Return
Boolean	true if big overlays should be docked next to the activity instead of overlay its content

See Also

• #setShouldDockBigOverlays

shouldShowRequestPermissionRationale

Added in API level 23

open fun shouldShowRequestPermissionRationale(permission: String): Boolean

Gets whether you should show UI with rationale before requesting a permission.

Parameters
permission	String: A permission your app wants to request. This value cannot be null.

Return
Boolean	Whether you should show permission rationale UI.

See Also

• #checkSelfPermission

shouldShowRequestPermissionRationale

Added in API level 35

open fun shouldShowRequestPermissionRationale(
    permission: String, 
    deviceId: Int
): Boolean

Gets whether you should show UI with rationale before requesting a permission.

Parameters
permission	String: A permission your app wants to request. This value cannot be null.
deviceId	Int: The app is requesting permissions for this device. The primary/physical device is assigned Context#DEVICE_ID_DEFAULT, and virtual devices are assigned unique device Ids.

Return
Boolean	Whether you should show permission rationale UI.

See Also

• #checkSelfPermission

shouldUpRecreateTask

Added in API level 16

open fun shouldUpRecreateTask(targetIntent: Intent!): Boolean

Returns true if the app should recreate the task when navigating 'up' from this activity by using targetIntent.

If this method returns false the app can trivially call navigateUpTo(android.content.Intent) using the same parameters to correctly perform up navigation. If this method returns false, the app should synthesize a new task stack by using TaskStackBuilder or another similar mechanism to perform up navigation.

Parameters
targetIntent	Intent!: An intent representing the target destination for up navigation

Return
Boolean	true if navigating up should recreate a new task stack, false if the same task should be used for the destination

showAssist

Added in API level 23

open fun showAssist(args: Bundle!): Boolean

Ask to have the current assistant shown to the user. This only works if the calling activity is the current foreground activity. It is the same as calling VoiceInteractionService.showSession and requesting all of the possible context. The receiver will always see android.service.voice.VoiceInteractionSession#SHOW_SOURCE_APPLICATION set.

Return
Boolean	Returns true if the assistant was successfully invoked, else false. For example false will be returned if the caller is not the current top activity.

showDialog

Added in API level 1
Deprecated in API level 15

fun showDialog(id: Int): Unit

Deprecated: Use the new DialogFragment class with FragmentManager instead; this is also available on older platforms through the Android compatibility package.

Simple version of showDialog(int,android.os.Bundle) that does not take any arguments. Simply calls showDialog(int,android.os.Bundle) with null arguments.

showDialog

Added in API level 8
Deprecated in API level 15

fun showDialog(
    id: Int, 
    args: Bundle!
): Boolean

Deprecated: Use the new DialogFragment class with FragmentManager instead; this is also available on older platforms through the Android compatibility package.

Show a dialog managed by this activity. A call to onCreateDialog(int,android.os.Bundle) will be made with the same id the first time this is called for a given id. From thereafter, the dialog will be automatically saved and restored. If you are targeting android.os.Build.VERSION_CODES#HONEYCOMB or later, consider instead using a DialogFragment instead.

Each time a dialog is shown, onPrepareDialog(int,android.app.Dialog,android.os.Bundle) will be made to provide an opportunity to do any timely preparation.

Parameters
id	Int: The id of the managed dialog.
args	Bundle!: Arguments to pass through to the dialog. These will be saved and restored for you. Note that if the dialog is already created, onCreateDialog(int,android.os.Bundle) will not be called with the new arguments but onPrepareDialog(int,android.app.Dialog,android.os.Bundle) will be. If you need to rebuild the dialog, call removeDialog(int) first.

Return
Boolean	Returns true if the Dialog was created; false is returned if it is not created because onCreateDialog(int,android.os.Bundle) returns false.

See Also

• android.app.Dialog
• #onCreateDialog(int, Bundle)
• #onPrepareDialog(int, Dialog, Bundle)
• #dismissDialog(int)
• #removeDialog(int)

showLockTaskEscapeMessage

Added in API level 23

open fun showLockTaskEscapeMessage(): Unit

Shows the user the system defined message for telling the user how to exit lock task mode. The task containing this activity must be in lock task mode at the time of this call for the message to be displayed.

startActionMode

Added in API level 11

open fun startActionMode(callback: ActionMode.Callback!): ActionMode?

Start an action mode of the default type ActionMode#TYPE_PRIMARY.

Parameters
callback	ActionMode.Callback!: Callback that will manage lifecycle events for this action mode

Return
ActionMode?	The ActionMode that was started, or null if it was canceled

See Also

• android.view.ActionMode

startActionMode

Added in API level 23

open fun startActionMode(
    callback: ActionMode.Callback!, 
    type: Int
): ActionMode?

Start an action mode of the given type.

Parameters
callback	ActionMode.Callback!: Callback that will manage lifecycle events for this action mode
type	Int: One of ActionMode#TYPE_PRIMARY or ActionMode#TYPE_FLOATING.

Return
ActionMode?	The ActionMode that was started, or null if it was canceled

See Also

• android.view.ActionMode

startActivities

Added in API level 11

open fun startActivities(intents: Array<Intent!>!): Unit

Same as #startActivities(android.content.Intent[],android.os.Bundle) with no options specified.

Parameters
intents	Array<Intent!>!: The intents to start.

Exceptions
android.content.ActivityNotFoundException

See Also

startActivities

Added in API level 16

open fun startActivities(
    intents: Array<Intent!>!, 
    options: Bundle?
): Unit

Launch a new activity. You will not receive any information about when the activity exits. This implementation overrides the base version, providing information about the activity performing the launch. Because of this additional information, the Intent#FLAG_ACTIVITY_NEW_TASK launch flag is not required; if not specified, the new activity will be added to the task of the caller.

This method throws android.content.ActivityNotFoundException if there was no Activity found to run the given Intent.

Parameters
intents	Array<Intent!>!: The intents to start.
options	Bundle?: Additional options for how the Activity should be started. See android.content.Context#startActivity(Intent, Bundle) Context.startActivity(Intent, Bundle)} for more details. This value may be null.

Exceptions
android.content.ActivityNotFoundException

See Also

startActivity

Added in API level 1

open fun startActivity(intent: Intent!): Unit

Same as #startActivity(android.content.Intent,android.os.Bundle) with no options specified.

Parameters
intent	Intent!: The intent to start.

Exceptions
android.content.ActivityNotFoundException

See Also

startActivity

Added in API level 16

open fun startActivity(
    intent: Intent!, 
    options: Bundle?
): Unit

Launch a new activity. You will not receive any information about when the activity exits. This implementation overrides the base version, providing information about the activity performing the launch. Because of this additional information, the Intent#FLAG_ACTIVITY_NEW_TASK launch flag is not required; if not specified, the new activity will be added to the task of the caller.

This method throws android.content.ActivityNotFoundException if there was no Activity found to run the given Intent.

Parameters
intent	Intent!: The intent to start.
options	Bundle?: Additional options for how the Activity should be started. See android.content.Context#startActivity(Intent, Bundle) Context.startActivity(Intent, Bundle)} for more details. This value may be null.

Exceptions
android.content.ActivityNotFoundException

See Also

startActivityForResult

Added in API level 1

open fun startActivityForResult(
    intent: Intent!, 
    requestCode: Int
): Unit

Same as calling startActivityForResult(android.content.Intent,int,android.os.Bundle) with no options.

Parameters
intent	Intent!: The intent to start.
requestCode	Int: If >= 0, this code will be returned in onActivityResult() when the activity exits.

Exceptions
android.content.ActivityNotFoundException

See Also

startActivityForResult

Added in API level 16

open fun startActivityForResult(
    intent: Intent!, 
    requestCode: Int, 
    options: Bundle?
): Unit

Launch an activity for which you would like a result when it finished. When this activity exits, your onActivityResult() method will be called with the given requestCode. Using a negative requestCode is the same as calling #startActivity (the activity is not launched as a sub-activity).

Note that this method should only be used with Intent protocols that are defined to return a result. In other protocols (such as Intent#ACTION_MAIN or Intent#ACTION_VIEW), you may not get the result when you expect. For example, if the activity you are launching uses Intent#FLAG_ACTIVITY_NEW_TASK, it will not run in your task and thus you will immediately receive a cancel result.

As a special case, if you call startActivityForResult() with a requestCode >= 0 during the initial onCreate(Bundle savedInstanceState)/onResume() of your activity, then your window will not be displayed until a result is returned back from the started activity. This is to avoid visible flickering when redirecting to another activity.

This method throws android.content.ActivityNotFoundException if there was no Activity found to run the given Intent.

Parameters
intent	Intent!: The intent to start.
requestCode	Int: If >= 0, this code will be returned in onActivityResult() when the activity exits.
options	Bundle?: Additional options for how the Activity should be started. See android.content.Context#startActivity(Intent, Bundle) Context.startActivity(Intent, Bundle)} for more details. This value may be null.

Exceptions
android.content.ActivityNotFoundException

See Also

startActivityFromChild

Added in API level 1
Deprecated in API level 30

open fun startActivityFromChild(
    child: Activity, 
    intent: Intent!, 
    requestCode: Int
): Unit

Deprecated: Use androidx.fragment.app.FragmentActivity#startActivityFromFragment( androidx.fragment.app.Fragment,Intent,int)

Same as calling startActivityFromChild(android.app.Activity,android.content.Intent,int,android.os.Bundle) with no options.

Parameters
child	Activity: The activity making the call. This value cannot be null.
intent	Intent!: The intent to start.
requestCode	Int: Reply request code. < 0 if reply is not requested.

Exceptions
android.content.ActivityNotFoundException

See Also

startActivityFromChild

Added in API level 16
Deprecated in API level 30

open fun startActivityFromChild(
    child: Activity, 
    intent: Intent!, 
    requestCode: Int, 
    options: Bundle?
): Unit

Deprecated: Use androidx.fragment.app.FragmentActivity#startActivityFromFragment( androidx.fragment.app.Fragment,Intent,int,Bundle)

This is called when a child activity of this one calls its #startActivity or #startActivityForResult method.

This method throws android.content.ActivityNotFoundException if there was no Activity found to run the given Intent.

Parameters
child	Activity: The activity making the call. This value cannot be null.
intent	Intent!: The intent to start.
requestCode	Int: Reply request code. < 0 if reply is not requested.
options	Bundle?: Additional options for how the Activity should be started. See android.content.Context#startActivity(Intent, Bundle) Context.startActivity(Intent, Bundle)} for more details. This value may be null.

Exceptions
android.content.ActivityNotFoundException

See Also

startActivityFromFragment

Added in API level 11
Deprecated in API level 28

open fun startActivityFromFragment(
    fragment: Fragment, 
    intent: Intent!, 
    requestCode: Int
): Unit

Deprecated: Use androidx.fragment.app.FragmentActivity#startActivityFromFragment( androidx.fragment.app.Fragment,Intent,int)

Same as calling startActivityFromFragment(android.app.Fragment,android.content.Intent,int,android.os.Bundle) with no options.

Parameters
fragment	Fragment: The fragment making the call. This value cannot be null.
intent	Intent!: The intent to start.
requestCode	Int: Reply request code. < 0 if reply is not requested.

Exceptions
android.content.ActivityNotFoundException

See Also

startActivityFromFragment

Added in API level 16
Deprecated in API level 28

open fun startActivityFromFragment(
    fragment: Fragment, 
    intent: Intent!, 
    requestCode: Int, 
    options: Bundle?
): Unit

Deprecated: Use androidx.fragment.app.FragmentActivity#startActivityFromFragment( androidx.fragment.app.Fragment,Intent,int,Bundle)

This is called when a Fragment in this activity calls its android.app.Fragment#startActivity or android.app.Fragment#startActivityForResult method.

This method throws android.content.ActivityNotFoundException if there was no Activity found to run the given Intent.

Parameters
fragment	Fragment: The fragment making the call. This value cannot be null.
intent	Intent!: The intent to start.
requestCode	Int: Reply request code. < 0 if reply is not requested.
options	Bundle?: Additional options for how the Activity should be started. See android.content.Context#startActivity(Intent, Bundle) Context.startActivity(Intent, Bundle)} for more details. This value may be null.

Exceptions
android.content.ActivityNotFoundException

See Also

startActivityIfNeeded

Added in API level 1

open fun startActivityIfNeeded(
    intent: Intent, 
    requestCode: Int
): Boolean

Same as calling startActivityIfNeeded(android.content.Intent,int,android.os.Bundle) with no options.

Parameters
intent	Intent: The intent to start. This value cannot be null.
requestCode	Int: If >= 0, this code will be returned in onActivityResult() when the activity exits, as described in #startActivityForResult.

Return
Boolean	If a new activity was launched then true is returned; otherwise false is returned and you must handle the Intent yourself.

See Also

startActivityIfNeeded

Added in API level 16

open fun startActivityIfNeeded(
    intent: Intent, 
    requestCode: Int, 
    options: Bundle?
): Boolean

A special variation to launch an activity only if a new activity instance is needed to handle the given Intent. In other words, this is just like startActivityForResult(android.content.Intent,int) except: if you are using the Intent#FLAG_ACTIVITY_SINGLE_TOP flag, or singleTask or singleTop launchMode, and the activity that handles intent is the same as your currently running activity, then a new instance is not needed. In this case, instead of the normal behavior of calling #onNewIntent this function will return and you can handle the Intent yourself.

This function can only be called from a top-level activity; if it is called from a child activity, a runtime exception will be thrown.

Parameters
intent	Intent: The intent to start. This value cannot be null.
requestCode	Int: If >= 0, this code will be returned in onActivityResult() when the activity exits, as described in #startActivityForResult.
options	Bundle?: Additional options for how the Activity should be started. See android.content.Context#startActivity(Intent, Bundle) Context.startActivity(Intent, Bundle)} for more details. This value may be null.

Return
Boolean	If a new activity was launched then true is returned; otherwise false is returned and you must handle the Intent yourself.

See Also

startIntentSender

Added in API level 5

open fun startIntentSender(
    intent: IntentSender!, 
    fillInIntent: Intent?, 
    flagsMask: Int, 
    flagsValues: Int, 
    extraFlags: Int
): Unit

Same as calling #startIntentSender(android.content.IntentSender,android.content.Intent,int,int,int,android.os.Bundle) with no options.

Parameters
intent	IntentSender!: The IntentSender to launch.
fillInIntent	Intent?: If non-null, this will be provided as the intent parameter to android.content.IntentSender#sendIntent.
flagsMask	Int: Intent flags in the original IntentSender that you would like to change.
flagsValues	Int: Desired values for any bits set in flagsMask
extraFlags	Int: Always set to 0.

startIntentSender

Added in API level 16

open fun startIntentSender(
    intent: IntentSender!, 
    fillInIntent: Intent?, 
    flagsMask: Int, 
    flagsValues: Int, 
    extraFlags: Int, 
    options: Bundle?
): Unit

Like #startActivity(android.content.Intent,android.os.Bundle), but taking a IntentSender to start; see startIntentSenderForResult(android.content.IntentSender,int,android.content.Intent,int,int,int,android.os.Bundle) for more information.

Parameters
intent	IntentSender!: The IntentSender to launch.
fillInIntent	Intent?: If non-null, this will be provided as the intent parameter to android.content.IntentSender#sendIntent.
flagsMask	Int: Intent flags in the original IntentSender that you would like to change.
flagsValues	Int: Desired values for any bits set in flagsMask
extraFlags	Int: Always set to 0.
options	Bundle?: Additional options for how the Activity should be started. See android.content.Context#startActivity(Intent, Bundle) Context.startActivity(Intent, Bundle)} for more details. If options have also been supplied by the IntentSender, options given here will override any that conflict with those given by the IntentSender. This value may be null.

startIntentSenderForResult

Added in API level 5

open fun startIntentSenderForResult(
    intent: IntentSender!, 
    requestCode: Int, 
    fillInIntent: Intent?, 
    flagsMask: Int, 
    flagsValues: Int, 
    extraFlags: Int
): Unit

Same as calling startIntentSenderForResult(android.content.IntentSender,int,android.content.Intent,int,int,int,android.os.Bundle) with no options.

Parameters
intent	IntentSender!: The IntentSender to launch.
requestCode	Int: If >= 0, this code will be returned in onActivityResult() when the activity exits.
fillInIntent	Intent?: If non-null, this will be provided as the intent parameter to android.content.IntentSender#sendIntent.
flagsMask	Int: Intent flags in the original IntentSender that you would like to change.
flagsValues	Int: Desired values for any bits set in flagsMask
extraFlags	Int: Always set to 0.

startIntentSenderForResult

Added in API level 16

open fun startIntentSenderForResult(
    intent: IntentSender!, 
    requestCode: Int, 
    fillInIntent: Intent?, 
    flagsMask: Int, 
    flagsValues: Int, 
    extraFlags: Int, 
    options: Bundle?
): Unit

Like startActivityForResult(android.content.Intent,int), but allowing you to use a IntentSender to describe the activity to be started. If the IntentSender is for an activity, that activity will be started as if you had called the regular startActivityForResult(android.content.Intent,int) here; otherwise, its associated action will be executed (such as sending a broadcast) as if you had called android.content.IntentSender#sendIntent on it.

Parameters
intent	IntentSender!: The IntentSender to launch.
requestCode	Int: If >= 0, this code will be returned in onActivityResult() when the activity exits.
fillInIntent	Intent?: If non-null, this will be provided as the intent parameter to android.content.IntentSender#sendIntent.
flagsMask	Int: Intent flags in the original IntentSender that you would like to change.
flagsValues	Int: Desired values for any bits set in flagsMask
extraFlags	Int: Always set to 0.
options	Bundle?: Additional options for how the Activity should be started. See android.content.Context#startActivity(Intent, Bundle) Context.startActivity(Intent, Bundle)} for more details. If options have also been supplied by the IntentSender, options given here will override any that conflict with those given by the IntentSender. This value may be null.

startIntentSenderFromChild

Added in API level 5
Deprecated in API level 30

open fun startIntentSenderFromChild(
    child: Activity!, 
    intent: IntentSender!, 
    requestCode: Int, 
    fillInIntent: Intent!, 
    flagsMask: Int, 
    flagsValues: Int, 
    extraFlags: Int
): Unit

Deprecated: Use startIntentSenderForResult(android.content.IntentSender,int,android.content.Intent,int,int,int) instead.

Same as calling startIntentSenderFromChild(android.app.Activity,android.content.IntentSender,int,android.content.Intent,int,int,int,android.os.Bundle) with no options.

startIntentSenderFromChild

Added in API level 16
Deprecated in API level 30

open fun startIntentSenderFromChild(
    child: Activity!, 
    intent: IntentSender!, 
    requestCode: Int, 
    fillInIntent: Intent!, 
    flagsMask: Int, 
    flagsValues: Int, 
    extraFlags: Int, 
    options: Bundle?
): Unit

Deprecated: Use startIntentSenderForResult(android.content.IntentSender,int,android.content.Intent,int,int,int,android.os.Bundle) instead.

Like startActivityFromChild(android.app.Activity,android.content.Intent,int), but taking a IntentSender; see startIntentSenderForResult(android.content.IntentSender,int,android.content.Intent,int,int,int) for more information.

Parameters
options	Bundle?: This value may be null.

startLocalVoiceInteraction

Added in API level 24

open fun startLocalVoiceInteraction(privateOptions: Bundle!): Unit

Starts a local voice interaction session. When ready, onLocalVoiceInteractionStarted() is called. You can pass a bundle of private options to the registered voice interaction service.

Parameters
privateOptions	Bundle!: a Bundle of private arguments to the current voice interaction service

startLockTask

Added in API level 21

open fun startLockTask(): Unit

Request to put this activity in a mode where the user is locked to a restricted set of applications.

If DevicePolicyManager#isLockTaskPermitted(String) returns true for this component, the current task will be launched directly into LockTask mode. Only apps allowlisted by DevicePolicyManager#setLockTaskPackages(ComponentName, String[]) can be launched while LockTask mode is active. The user will not be able to leave this mode until this activity calls stopLockTask(). Calling this method while the device is already in LockTask mode has no effect.

Otherwise, the current task will be launched into screen pinning mode. In this case, the system will prompt the user with a dialog requesting permission to use this mode. The user can exit at any time through instructions shown on the request dialog. Calling stopLockTask() will also terminate this mode.

Note: this method can only be called when the activity is foreground. That is, between onResume() and onPause().

See Also

• #stopLockTask()
• android.R.attr#lockTaskMode

startManagingCursor

Added in API level 1
Deprecated in API level 15

open fun startManagingCursor(c: Cursor!): Unit

Deprecated: Use the new android.content.CursorLoader class with LoaderManager instead; this is also available on older platforms through the Android compatibility package.

This method allows the activity to take care of managing the given Cursor's lifecycle for you based on the activity's lifecycle. That is, when the activity is stopped it will automatically call Cursor#deactivate on the given Cursor, and when it is later restarted it will call Cursor#requery for you. When the activity is destroyed, all managed Cursors will be closed automatically. If you are targeting android.os.Build.VERSION_CODES#HONEYCOMB or later, consider instead using LoaderManager instead, available via getLoaderManager().

Warning: Do not call android.database.Cursor#close() on cursor obtained from managedQuery, because the activity will do that for you at the appropriate time. However, if you call stopManagingCursor on a cursor from a managed query, the system will not automatically close the cursor and, in that case, you must call android.database.Cursor#close().

Parameters
c	Cursor!: The Cursor to be managed.

See Also

• #managedQuery(android.net.Uri , String[], String, String[], String)
• #stopManagingCursor

startNextMatchingActivity

Added in API level 1

open fun startNextMatchingActivity(intent: Intent): Boolean

Same as calling startNextMatchingActivity(android.content.Intent,android.os.Bundle) with no options.

Parameters
intent	Intent: The intent to dispatch to the next activity. For correct behavior, this must be the same as the Intent that started your own activity; the only changes you can make are to the extras inside of it. This value cannot be null.

Return
Boolean	Returns a boolean indicating whether there was another Activity to start: true if there was a next activity to start, false if there wasn't. In general, if true is returned you will then want to call finish() on yourself.

startNextMatchingActivity

Added in API level 16

open fun startNextMatchingActivity(
    intent: Intent, 
    options: Bundle?
): Boolean

Special version of starting an activity, for use when you are replacing other activity components. You can use this to hand the Intent off to the next Activity that can handle it. You typically call this in #onCreate with the Intent returned by getIntent.

Parameters
intent	Intent: The intent to dispatch to the next activity. For correct behavior, this must be the same as the Intent that started your own activity; the only changes you can make are to the extras inside of it. This value cannot be null.
options	Bundle?: Additional options for how the Activity should be started. See android.content.Context#startActivity(Intent, Bundle) Context.startActivity(Intent, Bundle)} for more details. This value may be null.

Return
Boolean	Returns a boolean indicating whether there was another Activity to start: true if there was a next activity to start, false if there wasn't. In general, if true is returned you will then want to call finish() on yourself.

startPostponedEnterTransition

Added in API level 21

open fun startPostponedEnterTransition(): Unit

Begin postponed transitions after postponeEnterTransition() was called. If postponeEnterTransition() was called, you must call startPostponedEnterTransition() to have your Activity start drawing.

startSearch

Added in API level 1

open fun startSearch(
    initialQuery: String?, 
    selectInitialQuery: Boolean, 
    appSearchData: Bundle?, 
    globalSearch: Boolean
): Unit

This hook is called to launch the search UI.

It is typically called from onSearchRequested(), either directly from Activity.onSearchRequested() or from an overridden version in any given Activity. If your goal is simply to activate search, it is preferred to call onSearchRequested(), which may have been overridden elsewhere in your Activity. If your goal is to inject specific data such as context data, it is preferred to override onSearchRequested(), so that any callers to it will benefit from the override.

Note: when running in a Configuration#UI_MODE_TYPE_WATCH, use of this API is not supported.

Parameters
initialQuery	String?: Any non-null non-empty string will be inserted as pre-entered text in the search query box.
selectInitialQuery	Boolean: If true, the initial query will be preselected, which means that any further typing will replace it. This is useful for cases where an entire pre-formed query is being inserted. If false, the selection point will be placed at the end of the inserted query. This is useful when the inserted query is text that the user entered, and the user would expect to be able to keep typing. This parameter is only meaningful if initialQuery is a non-empty string.
appSearchData	Bundle?: An application can insert application-specific context here, in order to improve quality or specificity of its own searches. This data will be returned with SEARCH intent(s). Null if no extra data is required. This value may be null.
globalSearch	Boolean: If false, this will only launch the search that has been specifically defined by the application (which is usually defined as a local search). If no default search is defined in the current application or activity, global search will be launched. If true, this will always launch a platform-global (e.g. web-based) search instead.

See Also

• android.app.SearchManager

stopLocalVoiceInteraction

Added in API level 24

open fun stopLocalVoiceInteraction(): Unit

Request to terminate the current voice interaction that was previously started using startLocalVoiceInteraction(android.os.Bundle). When the interaction is terminated, onLocalVoiceInteractionStopped() will be called.

stopLockTask

Added in API level 21

open fun stopLockTask(): Unit

Stop the current task from being locked.

Called to end the LockTask or screen pinning mode started by startLockTask(). This can only be called by activities that have called startLockTask() previously.

Note: If the device is in LockTask mode that is not initially started by this activity, then calling this method will not terminate the LockTask mode, but only finish its own task. The device will remain in LockTask mode, until the activity which started the LockTask mode calls this method, or until its allowlist authorization is revoked by DevicePolicyManager#setLockTaskPackages(ComponentName, String[]).

See Also

• #startLockTask()
• android.R.attr#lockTaskMode
• android.app.ActivityManager#getLockTaskModeState()

stopManagingCursor

Added in API level 1
Deprecated in API level 15

open fun stopManagingCursor(c: Cursor!): Unit

Deprecated: Use the new android.content.CursorLoader class with LoaderManager instead; this is also available on older platforms through the Android compatibility package.

Given a Cursor that was previously given to startManagingCursor, stop the activity's management of that cursor.

Warning: After calling this method on a cursor from a managed query, the system will not automatically close the cursor and you must call android.database.Cursor#close().

Parameters
c	Cursor!: The Cursor that was being managed.

See Also

• #startManagingCursor

takeKeyEvents

Added in API level 1

open fun takeKeyEvents(get: Boolean): Unit

Request that key events come to this activity. Use this if your activity has no views with focus, but the activity still wants a chance to process key events.

See Also

• android.view.Window#takeKeyEvents

triggerSearch

Added in API level 5

open fun triggerSearch(
    query: String!, 
    appSearchData: Bundle?
): Unit

Similar to startSearch, but actually fires off the search query after invoking the search dialog. Made available for testing purposes.

Parameters
query	String!: The query to trigger. If empty, the request will be ignored.
appSearchData	Bundle?: An application can insert application-specific context here, in order to improve quality or specificity of its own searches. This data will be returned with SEARCH intent(s). Null if no extra data is required. This value may be null.

unregisterActivityLifecycleCallbacks

Added in API level 29

open fun unregisterActivityLifecycleCallbacks(callback: Application.ActivityLifecycleCallbacks): Unit

Unregister an Application.ActivityLifecycleCallbacks previously registered with registerActivityLifecycleCallbacks. It will not receive any further callbacks.

Parameters
callback	Application.ActivityLifecycleCallbacks: The callback instance to unregister This value cannot be null.

See Also

• #registerActivityLifecycleCallbacks

unregisterComponentCallbacks

Added in API level 14

open fun unregisterComponentCallbacks(callback: ComponentCallbacks!): Unit

Parameters
callback	ComponentCallbacks!: The interface to call. This can be either a ComponentCallbacks or ComponentCallbacks2 interface.

Exceptions
java.lang.IllegalStateException	if this method calls before attachBaseContext(android.content.Context)

unregisterForContextMenu

Added in API level 1

open fun unregisterForContextMenu(view: View!): Unit

Prevents a context menu to be shown for the given view. This method will remove the OnCreateContextMenuListener on the view.

Parameters
view	View!: The view that should stop showing a context menu.

See Also

• #registerForContextMenu(View)

unregisterScreenCaptureCallback

Added in API level 34

open fun unregisterScreenCaptureCallback(callback: Activity.ScreenCaptureCallback): Unit

Unregisters a screen capture callback for this surface.
Requires android.Manifest.permission#DETECT_SCREEN_CAPTURE

Parameters
callback	Activity.ScreenCaptureCallback: This value cannot be null.

Protected methods

attachBaseContext

Added in API level 1

protected open fun attachBaseContext(newBase: Context!): Unit

Parameters
base	The new base context for this wrapper.

onActivityResult

Added in API level 1

protected open fun onActivityResult(
    requestCode: Int, 
    resultCode: Int, 
    data: Intent!
): Unit

Called when an activity you launched exits, giving you the requestCode you started it with, the resultCode it returned, and any additional data from it. The resultCode will be RESULT_CANCELED if the activity explicitly returned that, didn't return any result, or crashed during its operation.

An activity can never receive a result in the resumed state. You can count on onResume being called after this method, though not necessarily immediately after. If the activity was resumed, it will be paused and the result will be delivered, followed by onResume. If the activity wasn't in the resumed state, then the result will be delivered, with onResume called sometime later when the activity becomes active again.

This method is never invoked if your activity sets noHistory to true.

Parameters
requestCode	Int: The integer request code originally supplied to startActivityForResult(), allowing you to identify who this result came from.
resultCode	Int: The integer result code returned by the child activity through its setResult().
data	Intent!: An Intent, which can return result data to the caller (various data can be attached to Intent "extras").

See Also

• #createPendingResult
• #setResult(int)

onApplyThemeResource

Added in API level 1

protected open fun onApplyThemeResource(
    theme: Resources.Theme!, 
    resid: Int, 
    first: Boolean
): Unit

Parameters
theme	Resources.Theme!: the theme being modified
resId	the style resource being applied to theme
first	Boolean: true if this is the first time a style is being applied to theme

onChildTitleChanged

Added in API level 1

protected open fun onChildTitleChanged(
    childActivity: Activity!, 
    title: CharSequence!
): Unit

onCreate

Added in API level 1

protected open fun onCreate(savedInstanceState: Bundle?): Unit

Called when the activity is starting. This is where most initialization should go: calling setContentView(int) to inflate the activity's UI, using findViewById to programmatically interact with widgets in the UI, calling managedQuery(android.net.Uri,java.lang.String[],java.lang.String,java.lang.String[],java.lang.String) to retrieve cursors for data being displayed, etc.

You can call finish from within this function, in which case onDestroy() will be immediately called after #onCreate without any of the rest of the activity lifecycle (onStart, onResume, onPause, etc) executing.

Derived classes must call through to the super class's implementation of this method. If they do not, an exception will be thrown.

This method must be called from the main thread of your app.
If you override this method you must call through to the superclass implementation.

Parameters
savedInstanceState	Bundle?: If the activity is being re-initialized after previously being shut down then this Bundle contains the data it most recently supplied in #onSaveInstanceState. Note: Otherwise it is null.

See Also

• #onStart

onCreateDialog

Added in API level 1
Deprecated in API level 15

protected open fun onCreateDialog(id: Int): Dialog!

Deprecated: Old no-arguments version of onCreateDialog(int,android.os.Bundle).

onCreateDialog

Added in API level 8
Deprecated in API level 15

protected open fun onCreateDialog(
    id: Int, 
    args: Bundle!
): Dialog?

Deprecated: Use the new DialogFragment class with FragmentManager instead; this is also available on older platforms through the Android compatibility package.

Callback for creating dialogs that are managed (saved and restored) for you by the activity. The default implementation calls through to onCreateDialog(int) for compatibility. If you are targeting android.os.Build.VERSION_CODES#HONEYCOMB or later, consider instead using a DialogFragment instead.

If you use showDialog(int), the activity will call through to this method the first time, and hang onto it thereafter. Any dialog that is created by this method will automatically be saved and restored for you, including whether it is showing.

If you would like the activity to manage saving and restoring dialogs for you, you should override this method and handle any ids that are passed to #showDialog.

If you would like an opportunity to prepare your dialog before it is shown, override onPrepareDialog(int,android.app.Dialog,android.os.Bundle).

Parameters
id	Int: The id of the dialog.
args	Bundle!: The dialog arguments provided to showDialog(int,android.os.Bundle).

Return
Dialog?	The dialog. If you return null, the dialog will not be created.

See Also

• #onPrepareDialog(int, Dialog, Bundle)
• #showDialog(int, Bundle)
• #dismissDialog(int)
• #removeDialog(int)

onDestroy

Added in API level 1

protected open fun onDestroy(): Unit

Perform any final cleanup before an activity is destroyed. This can happen either because the activity is finishing (someone called finish on it), or because the system is temporarily destroying this instance of the activity to save space. You can distinguish between these two scenarios with the isFinishing method.

Note: do not count on this method being called as a place for saving data! For example, if an activity is editing data in a content provider, those edits should be committed in either onPause or #onSaveInstanceState, not here. This method is usually implemented to free resources like threads that are associated with an activity, so that a destroyed activity does not leave such things around while the rest of its application is still running. There are situations where the system will simply kill the activity's hosting process without calling this method (or any others) in it, so it should not be used to do things that are intended to remain around after the process goes away.

Derived classes must call through to the super class's implementation of this method. If they do not, an exception will be thrown.

If you override this method you must call through to the superclass implementation.

See Also

• #onPause
• #onStop
• #finish
• #isFinishing

onNewIntent

Added in API level 1

protected open fun onNewIntent(intent: Intent!): Unit

This is called for activities that set launchMode to "singleTop" in their package, or if a client used the Intent#FLAG_ACTIVITY_SINGLE_TOP flag when calling #startActivity. In either case, when the activity is re-launched while at the top of the activity stack instead of a new instance of the activity being started, onNewIntent() will be called on the existing instance with the Intent that was used to re-launch it.

An activity can never receive a new intent in the resumed state. You can count on onResume being called after this method, though not necessarily immediately after the completion of this callback. If the activity was resumed, it will be paused and new intent will be delivered, followed by onResume. If the activity wasn't in the resumed state, then new intent can be delivered immediately, with onResume() called sometime later when activity becomes active again.

Note that getIntent still returns the original Intent. You can use setIntent(android.content.Intent) to update it to this new Intent.

Parameters
intent	Intent!: The new intent that was used to start the activity

See Also

• #getIntent
• #setIntent(Intent)
• #onResume

onPause

Added in API level 1

protected open fun onPause(): Unit

Called as part of the activity lifecycle when the user no longer actively interacts with the activity, but it is still visible on screen. The counterpart to onResume.

When activity B is launched in front of activity A, this callback will be invoked on A. B will not be created until A's onPause returns, so be sure to not do anything lengthy here.

This callback is mostly used for saving any persistent state the activity is editing, to present a "edit in place" model to the user and making sure nothing is lost if there are not enough resources to start the new activity without first killing this one. This is also a good place to stop things that consume a noticeable amount of CPU in order to make the switch to the next activity as fast as possible.

On platform versions prior to android.os.Build.VERSION_CODES#Q this is also a good place to try to close exclusive-access devices or to release access to singleton resources. Starting with android.os.Build.VERSION_CODES#Q there can be multiple resumed activities in the system at the same time, so onTopResumedActivityChanged(boolean) should be used for that purpose instead.

If an activity is launched on top, after receiving this call you will usually receive a following call to onStop (after the next activity has been resumed and displayed above). However in some cases there will be a direct call back to onResume without going through the stopped state. An activity can also rest in paused state in some cases when in multi-window mode, still visible to user.

Derived classes must call through to the super class's implementation of this method. If they do not, an exception will be thrown.

If you override this method you must call through to the superclass implementation.

See Also

• #onResume
• #onStop

onPostCreate

Added in API level 1

protected open fun onPostCreate(savedInstanceState: Bundle?): Unit

Called when activity start-up is complete (after onStart and #onRestoreInstanceState have been called). Applications will generally not implement this method; it is intended for system classes to do final initialization after application code has run.

Derived classes must call through to the super class's implementation of this method. If they do not, an exception will be thrown.

If you override this method you must call through to the superclass implementation.

Parameters
savedInstanceState	Bundle?: If the activity is being re-initialized after previously being shut down then this Bundle contains the data it most recently supplied in #onSaveInstanceState. Note: Otherwise it is null.

See Also

onPostResume

Added in API level 1

protected open fun onPostResume(): Unit

Called when activity resume is complete (after onResume has been called). Applications will generally not implement this method; it is intended for system classes to do final setup after application resume code has run.

Derived classes must call through to the super class's implementation of this method. If they do not, an exception will be thrown.

If you override this method you must call through to the superclass implementation.

See Also

• #onResume

onPrepareDialog

Added in API level 1
Deprecated in API level 15

protected open fun onPrepareDialog(
    id: Int, 
    dialog: Dialog!
): Unit

Deprecated: Old no-arguments version of onPrepareDialog(int,android.app.Dialog,android.os.Bundle).

onPrepareDialog

Added in API level 8
Deprecated in API level 15

protected open fun onPrepareDialog(
    id: Int, 
    dialog: Dialog!, 
    args: Bundle!
): Unit

Deprecated: Use the new DialogFragment class with FragmentManager instead; this is also available on older platforms through the Android compatibility package.

Provides an opportunity to prepare a managed dialog before it is being shown. The default implementation calls through to onPrepareDialog(int,android.app.Dialog) for compatibility.

Override this if you need to update a managed dialog based on the state of the application each time it is shown. For example, a time picker dialog might want to be updated with the current time. You should call through to the superclass's implementation. The default implementation will set this Activity as the owner activity on the Dialog.

Parameters
id	Int: The id of the managed dialog.
dialog	Dialog!: The dialog.
args	Bundle!: The dialog arguments provided to showDialog(int,android.os.Bundle).

See Also

• #onCreateDialog(int, Bundle)
• #showDialog(int)
• #dismissDialog(int)
• #removeDialog(int)

onRestart

Added in API level 1

protected open fun onRestart(): Unit

Called after onStop when the current activity is being re-displayed to the user (the user has navigated back to it). It will be followed by onStart and then onResume.

For activities that are using raw Cursor objects (instead of creating them through managedQuery(android.net.Uri,java.lang.String[],java.lang.String,java.lang.String[],java.lang.String), this is usually the place where the cursor should be requeried (because you had deactivated it in onStop.

Derived classes must call through to the super class's implementation of this method. If they do not, an exception will be thrown.

If you override this method you must call through to the superclass implementation.

See Also

• #onStop
• #onStart
• #onResume

onRestoreInstanceState

Added in API level 1

protected open fun onRestoreInstanceState(savedInstanceState: Bundle): Unit

This method is called after onStart when the activity is being re-initialized from a previously saved state, given here in savedInstanceState. Most implementations will simply use #onCreate to restore their state, but it is sometimes convenient to do it here after all of the initialization has been done or to allow subclasses to decide whether to use your default implementation. The default implementation of this method performs a restore of any view state that had previously been frozen by #onSaveInstanceState.

This method is called between onStart and #onPostCreate. This method is called only when recreating an activity; the method isn't invoked if onStart is called for any other reason.

Parameters
savedInstanceState	Bundle: the data most recently supplied in #onSaveInstanceState. This value cannot be null.

See Also

• #onResume

onResume

Added in API level 1

protected open fun onResume(): Unit

Called after #onRestoreInstanceState, onRestart, or onPause. This is usually a hint for your activity to start interacting with the user, which is a good indicator that the activity became active and ready to receive input. This sometimes could also be a transit state toward another resting state. For instance, an activity may be relaunched to onPause due to configuration changes and the activity was visible, but wasn't the top-most activity of an activity task. onResume is guaranteed to be called before onPause in this case which honors the activity lifecycle policy and the activity eventually rests in onPause.

On platform versions prior to android.os.Build.VERSION_CODES#Q this is also a good place to try to open exclusive-access devices or to get access to singleton resources. Starting with android.os.Build.VERSION_CODES#Q there can be multiple resumed activities in the system simultaneously, so onTopResumedActivityChanged(boolean) should be used for that purpose instead.

Derived classes must call through to the super class's implementation of this method. If they do not, an exception will be thrown.

If you override this method you must call through to the superclass implementation.

See Also

• #onRestart
• #onPostResume
• #onPause
• #onTopResumedActivityChanged(boolean)

onSaveInstanceState

Added in API level 1

protected open fun onSaveInstanceState(outState: Bundle): Unit

Called to retrieve per-instance state from an activity before being killed so that the state can be restored in #onCreate or #onRestoreInstanceState (the Bundle populated by this method will be passed to both).

This method is called before an activity may be killed so that when it comes back some time in the future it can restore its state. For example, if activity B is launched in front of activity A, and at some point activity A is killed to reclaim resources, activity A will have a chance to save the current state of its user interface via this method so that when the user returns to activity A, the state of the user interface can be restored via #onCreate or #onRestoreInstanceState.

Do not confuse this method with activity lifecycle callbacks such as onPause, which is always called when the user no longer actively interacts with an activity, or onStop which is called when activity becomes invisible. One example of when onPause and onStop is called and not this method is when a user navigates back from activity B to activity A: there is no need to call #onSaveInstanceState on B because that particular instance will never be restored, so the system avoids calling it. An example when onPause is called and not #onSaveInstanceState is when activity B is launched in front of activity A: the system may avoid calling #onSaveInstanceState on activity A if it isn't killed during the lifetime of B since the state of the user interface of A will stay intact.

The default implementation takes care of most of the UI per-instance state for you by calling android.view.View#onSaveInstanceState() on each view in the hierarchy that has an id, and by saving the id of the currently focused view (all of which is restored by the default implementation of #onRestoreInstanceState). If you override this method to save additional information not captured by each individual view, you will likely want to call through to the default implementation, otherwise be prepared to save all of the state of each view yourself.

If called, this method will occur after onStop for applications targeting platforms starting with android.os.Build.VERSION_CODES#P. For applications targeting earlier platform versions this method will occur before onStop and there are no guarantees about whether it will occur before or after onPause.

Parameters
outState	Bundle: Bundle in which to place your saved state. This value cannot be null.

See Also

• #onPause

onStart

Added in API level 1

protected open fun onStart(): Unit

Called after #onCreate — or after onRestart when the activity had been stopped, but is now again being displayed to the user. It will usually be followed by onResume. This is a good place to begin drawing visual elements, running animations, etc.

You can call finish from within this function, in which case onStop will be immediately called after onStart without the lifecycle transitions in-between (onResume, onPause, etc) executing.

Derived classes must call through to the super class's implementation of this method. If they do not, an exception will be thrown.

If you override this method you must call through to the superclass implementation.

See Also

• #onStop
• #onResume

onStop

Added in API level 1

protected open fun onStop(): Unit

Called when you are no longer visible to the user. You will next receive either onRestart, onDestroy, or nothing, depending on later user activity. This is a good place to stop refreshing UI, running animations and other visual things.

Derived classes must call through to the super class's implementation of this method. If they do not, an exception will be thrown.

If you override this method you must call through to the superclass implementation.

See Also

• #onRestart
• #onResume
• #onDestroy

onTitleChanged

Added in API level 1

protected open fun onTitleChanged(
    title: CharSequence!, 
    color: Int
): Unit

onUserLeaveHint

Added in API level 3

protected open fun onUserLeaveHint(): Unit

Called as part of the activity lifecycle when an activity is about to go into the background as the result of user choice. For example, when the user presses the Home key, onUserLeaveHint will be called, but when an incoming phone call causes the in-call Activity to be automatically brought to the foreground, onUserLeaveHint will not be called on the activity being interrupted. In cases when it is invoked, this method is called right before the activity's onPause callback.

This callback and onUserInteraction are intended to help activities manage status bar notifications intelligently; specifically, for helping activities determine the proper time to cancel a notification.

See Also

• #onUserInteraction()
• android.content.Intent#FLAG_ACTIVITY_NO_USER_ACTION

Properties

FOCUSED_STATE_SET

Added in API level 1

protected static val FOCUSED_STATE_SET: IntArray!