AbstractListDetailFragment


abstract class AbstractListDetailFragment : Fragment


A fragment supports adaptive two-pane layout. The first child is a list pane, which could be a content list or browser, and the second child is NavHostFragment which controls to navigate between different detail views.

Implementation of the fragment should override this class and implement AbstractListDetailFragment.onCreateListPaneView to supply custom view for the list pane. The fragment provides default NavHostFragment with a NavGraph ID passed in the fragment, and it can be overridden by AbstractListDetailFragment.onCreateDetailPaneNavHostFragment and provide custom NavHostFragment.

Summary

Public constructors

Public functions

open NavHostFragment

Return an alternative NavHostFragment to swap the default NavHostFragment in the fragment.

abstract View
onCreateListPaneView(
    inflater: LayoutInflater,
    container: ViewGroup?,
    savedInstanceState: Bundle?
)

Provide a list pane view for the fragment.

final View
@CallSuper
onCreateView(
    inflater: LayoutInflater,
    container: ViewGroup?,
    savedInstanceState: Bundle?
)

Create the view for the fragment.

open Unit
@CallSuper
onInflate(
    context: Context,
    attrs: AttributeSet,
    savedInstanceState: Bundle?
)

Called when a fragment is being created as part of a view layout inflation, typically from setting the content view of an activity.

open Unit
onListPaneViewCreated(view: View, savedInstanceState: Bundle?)

Provides list pane view created in the fragment.

open Unit

Called to ask the fragment to save its current dynamic state, so it can later be reconstructed in a new instance if its process is restarted.

final Unit
@CallSuper
onViewCreated(view: View, savedInstanceState: Bundle?)

This method provides a callback onListPaneViewCreated after the view hierarchy has been completely created.

open Unit
@CallSuper
onViewStateRestored(savedInstanceState: Bundle?)

Called when all saved state has been restored into the view hierarchy of the fragment.

Public properties

NavHostFragment

Return the NavHostFragment this fragment uses

SlidingPaneLayout

Return the SlidingPaneLayout this fragment is currently controlling.

Inherited functions

From androidx.fragment.app.Fragment
open Unit
dump(
    prefix: String,
    fd: FileDescriptor?,
    writer: PrintWriter,
    args: Array<String>?
)

Print the Fragments's state into the given stream.

final operator Boolean
equals(other: Any?)

Subclasses can not override equals().

FragmentActivity?

Return the FragmentActivity this fragment is currently associated with.

open Boolean

Returns whether the the exit transition and enter transition overlap or not.

open Boolean

Returns whether the the return transition and reenter transition overlap or not.

Bundle?

Return the arguments supplied when the fragment was instantiated, if any.

FragmentManager

Return a private FragmentManager for placing and managing Fragments inside of this Fragment.

open Context?

Return the Context this fragment is currently associated with.

open Any?

Returns the Transition that will be used to move Views into the initial scene.

open Any?

Returns the Transition that will be used to move Views out of the scene when the fragment is removed, hidden, or detached when not popping the back stack.

FragmentManager?

This function is deprecated.

This has been removed in favor of getParentFragmentManager() which throws an IllegalStateException if the FragmentManager is null.

Any?

Return the host object of this fragment.

Int

Return the identifier this fragment is known by.

LayoutInflater

Returns the cached LayoutInflater used to inflate Views of this Fragment.

open LoaderManager

This function is deprecated.

Use LoaderManager.getInstance(this).

Fragment?

Returns the parent Fragment containing this Fragment.

FragmentManager

Return the FragmentManager for interacting with fragments associated with this fragment's activity.

open Any?

Returns the Transition that will be used to move Views in to the scene when returning due to popping a back stack.

Resources

Return requireActivity().getResources().

Boolean

This function is deprecated.

Instead of retaining the Fragment itself, use a non-retained Fragment and keep retained state in a ViewModel attached to that Fragment.

open Any?

Returns the Transition that will be used to move Views out of the scene when the Fragment is preparing to be removed, hidden, or detached because of popping the back stack.

open Any?

Returns the Transition that will be used for shared elements transferred into the content Scene.

open Any?

Return the Transition that will be used for shared elements transferred back during a pop of the back stack.

String

Return a localized string from the application's package's default string table.

String
getString(resId: @StringRes Int, vararg formatArgs: Any?)

Return a localized formatted string from the application's package's default string table, substituting the format arguments as defined in java.util.Formatter and format.

String?

Get the tag name of the fragment, if specified.

Fragment?

This function is deprecated.

Instead of using a target fragment to pass results, use setFragmentResult to deliver results to FragmentResultListener instances registered by other fragments via setFragmentResultListener.

Int

This function is deprecated.

When using the target fragment replacement of setFragmentResultListener and setFragmentResult, consider using setArguments to pass a requestKey if you need to support dynamic request keys.

CharSequence

Return a localized, styled CharSequence from the application's package's default string table.

open Boolean

This function is deprecated.

Use setMaxLifecycle instead.

open View?

Get the root view for the fragment's layout (the one returned by onCreateView), if provided.

open LifecycleOwner

Get a LifecycleOwner that represents the Fragment's View lifecycle.

open LiveData<LifecycleOwner>

Retrieve a LiveData which allows you to observe the lifecycle of the Fragment's View.

final Int

Subclasses can not override hashCode().

Boolean

Return true if the fragment is currently added to its activity.

Boolean

Return true if the fragment has been explicitly detached from the UI.

Boolean

Return true if the fragment has been hidden.

Boolean

Return true if the layout is included as part of an activity view hierarchy via the tag.

Boolean

Return true if this fragment is currently being removed from its activity.

Boolean

Return true if the fragment is in the resumed state.

Boolean

Returns true if this fragment is added and its state has already been saved by its host.

Boolean

Return true if the fragment is currently visible to the user.

open Unit

This function is deprecated.

use onViewCreated for code touching the view created by onCreateView and onCreate for other initialization.

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

This function is deprecated.

This method has been deprecated in favor of using the Activity Result API which brings increased type safety via an ActivityResultContract and the prebuilt contracts for common intents available in androidx.activity.result.contract.ActivityResultContracts, provides hooks for testing, and allow receiving results in separate, testable classes independent from your fragment.

open Unit

This function is deprecated.

See onAttach.

open Unit

Called when a fragment is first attached to its context.

open Unit

This function is deprecated.

The responsibility for listening for fragments being attached has been moved to FragmentManager.

open Unit
open Boolean

This hook is called whenever an item in a context menu is selected.

open Unit
@MainThread
@CallSuper
onCreate(savedInstanceState: Bundle?)

Called to do initial creation of a fragment.

open Animation?
@MainThread
onCreateAnimation(transit: Int, enter: Boolean, nextAnim: Int)

Called when a fragment loads an animation.

open Animator?
@MainThread
onCreateAnimator(transit: Int, enter: Boolean, nextAnim: Int)

Called when a fragment loads an animator.

open Unit
@MainThread
onCreateContextMenu(
    menu: ContextMenu,
    v: View,
    menuInfo: ContextMenu.ContextMenuInfo?
)

Called when a context menu for the view is about to be shown.

open Unit

This function is deprecated.

androidx.activity.ComponentActivity now implements MenuHost, an interface that allows any component, including your activity itself, to add menu items by calling addMenuProvider without forcing all components through this single method override.

open Unit

Called when the fragment is no longer in use.

open Unit

This function is deprecated.

androidx.activity.ComponentActivity now implements MenuHost, an interface that allows any component, including your activity itself, to add menu items by calling addMenuProvider without forcing all components through this single method override.

open Unit

Called when the view previously created by onCreateView has been detached from the fragment.

open Unit

Called when the fragment is no longer attached to its activity.

open LayoutInflater
onGetLayoutInflater(savedInstanceState: Bundle?)

Returns the LayoutInflater used to inflate Views of this Fragment.

open Unit

Called when the hidden state (as returned by isHidden of the fragment or another fragment in its hierarchy has changed.

open Unit
@UiThread
@CallSuper
onInflate(
    activity: Activity,
    attrs: AttributeSet,
    savedInstanceState: Bundle?
)

This function is deprecated.

See onInflate.

open Unit
open Unit
onMultiWindowModeChanged(isInMultiWindowMode: Boolean)

Called when the Fragment's activity changes from fullscreen mode to multi-window mode and visa-versa.

open Boolean

This function is deprecated.

androidx.activity.ComponentActivity now implements MenuHost, an interface that allows any component, including your activity itself, to add menu items by calling addMenuProvider without forcing all components through this single method override.

open Unit

This function is deprecated.

androidx.activity.ComponentActivity now implements MenuHost, an interface that allows any component, including your activity itself, to add menu items by calling addMenuProvider without forcing all components through this single method override.

open Unit

Called when the Fragment is no longer resumed.

open Unit
onPictureInPictureModeChanged(isInPictureInPictureMode: Boolean)

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

open Unit

This function is deprecated.

androidx.activity.ComponentActivity now implements MenuHost, an interface that allows any component, including your activity itself, to add menu items by calling addMenuProvider without forcing all components through this single method override.

open Unit
@MainThread
onPrimaryNavigationFragmentChanged(
    isPrimaryNavigationFragment: Boolean
)

Callback for when the primary navigation state of this Fragment has changed.

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

This function is deprecated.

This method has been deprecated in favor of using the Activity Result API which brings increased type safety via an ActivityResultContract and the prebuilt contracts for common intents available in androidx.activity.result.contract.ActivityResultContracts, provides hooks for testing, and allow receiving results in separate, testable classes independent from your fragment.

open Unit

Called when the fragment is visible to the user and actively running.

open Unit

Called when the Fragment is visible to the user.

open Unit

Called when the Fragment is no longer started.

open Unit

Postpone the entering Fragment transition until startPostponedEnterTransition or executePendingTransactions has been called.

Unit
postponeEnterTransition(duration: Long, timeUnit: TimeUnit)

Postpone the entering Fragment transition for a given amount of time and then call startPostponedEnterTransition.

final ActivityResultLauncher<I>
@MainThread
<I : Any, O : Any> registerForActivityResult(
    contract: ActivityResultContract<I, O>,
    callback: ActivityResultCallback<O>
)

Register a request to start an activity for result, designated by the given contract.

final ActivityResultLauncher<I>
@MainThread
<I : Any, O : Any> registerForActivityResult(
    contract: ActivityResultContract<I, O>,
    registry: ActivityResultRegistry,
    callback: ActivityResultCallback<O>
)

Register a request to start an activity for result, designated by the given contract.

open Unit

Registers a context menu to be shown for the given view (multiple views can show the context menu).

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

This function is deprecated.

This method has been deprecated in favor of using the Activity Result API which brings increased type safety via an ActivityResultContract and the prebuilt contracts for common intents available in androidx.activity.result.contract.ActivityResultContracts, provides hooks for testing, and allow receiving results in separate, testable classes independent from your fragment.

FragmentActivity

Return the FragmentActivity this fragment is currently associated with.

Bundle

Return the arguments supplied when the fragment was instantiated.

Context

Return the Context this fragment is currently associated with.

FragmentManager

This function is deprecated.

This has been renamed to getParentFragmentManager() to make it clear that you are accessing the FragmentManager that contains this Fragment and not the FragmentManager associated with child Fragments.

Any

Return the host object of this fragment.

Fragment

Returns the parent Fragment containing this Fragment.

View

Get the root view for the fragment's layout (the one returned by onCreateView).

open Unit

Sets whether the the exit transition and enter transition overlap or not.

open Unit

Sets whether the the return transition and reenter transition overlap or not.

open Unit

Supply the construction arguments for this fragment.

open Unit

When custom transitions are used with Fragments, the enter transition callback is called when this Fragment is attached or detached when not popping the back stack.

open Unit
setEnterTransition(transition: Any?)

Sets the Transition that will be used to move Views into the initial scene.

open Unit

When custom transitions are used with Fragments, the exit transition callback is called when this Fragment is attached or detached when popping the back stack.

open Unit
setExitTransition(transition: Any?)

Sets the Transition that will be used to move Views out of the scene when the fragment is removed, hidden, or detached when not popping the back stack.

open Unit

This function is deprecated.

This method is no longer needed when using a MenuProvider to provide a Menu to your activity, which replaces onCreateOptionsMenu as the recommended way to provide a consistent, optionally Lifecycle-aware, and modular way to handle menu creation and item selection.

open Unit

Set the initial saved state that this Fragment should restore itself from when first being constructed, as returned by FragmentManager.saveFragmentInstanceState.

open Unit
setMenuVisibility(menuVisible: Boolean)

Set a hint for whether this fragment's menu should be visible.

open Unit
setReenterTransition(transition: Any?)

Sets the Transition that will be used to move Views in to the scene when returning due to popping a back stack.

open Unit

This function is deprecated.

Instead of retaining the Fragment itself, use a non-retained Fragment and keep retained state in a ViewModel attached to that Fragment.

open Unit
setReturnTransition(transition: Any?)

Sets the Transition that will be used to move Views out of the scene when the Fragment is preparing to be removed, hidden, or detached because of popping the back stack.

open Unit

Sets the Transition that will be used for shared elements transferred into the content Scene.

open Unit

Sets the Transition that will be used for shared elements transferred back during a pop of the back stack.

open Unit
setTargetFragment(fragment: Fragment?, requestCode: Int)

This function is deprecated.

Instead of using a target fragment to pass results, the fragment requesting a result should use setFragmentResultListener to register a FragmentResultListener with a requestKey using its parent fragment manager.

open Unit
setUserVisibleHint(isVisibleToUser: Boolean)

This function is deprecated.

If you are manually calling this method, use setMaxLifecycle instead.

open Boolean

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

open Unit

Call startActivity from the fragment's containing Activity.

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

Call startActivity from the fragment's containing Activity.

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

This function is deprecated.

This method has been deprecated in favor of using the Activity Result API which brings increased type safety via an ActivityResultContract and the prebuilt contracts for common intents available in androidx.activity.result.contract.ActivityResultContracts, provides hooks for testing, and allow receiving results in separate, testable classes independent from your fragment.

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

This function is deprecated.

This method has been deprecated in favor of using the Activity Result API which brings increased type safety via an ActivityResultContract and the prebuilt contracts for common intents available in androidx.activity.result.contract.ActivityResultContracts, provides hooks for testing, and allow receiving results in separate, testable classes independent from your fragment.

open Unit
startIntentSenderForResult(
    intent: IntentSender,
    requestCode: Int,
    fillInIntent: Intent?,
    flagsMask: Int,
    flagsValues: Int,
    extraFlags: Int,
    options: Bundle?
)

This function is deprecated.

This method has been deprecated in favor of using the Activity Result API which brings increased type safety via an ActivityResultContract and the prebuilt contracts for common intents available in androidx.activity.result.contract.ActivityResultContracts, provides hooks for testing, and allow receiving results in separate, testable classes independent from your fragment.

open Unit

Begin postponed transitions after postponeEnterTransition was called.

open String
open Unit

Prevents a context menu to be shown for the given view.

Inherited properties

From androidx.fragment.app.Fragment
open CreationExtras

The Fragment's arguments when this is first called will be used as the defaults to any androidx.lifecycle.SavedStateHandle passed to a view model created using this extra.

open ViewModelProvider.Factory
open Lifecycle

Overriding this method is no longer supported and this method will be made final in a future version of Fragment.

final SavedStateRegistry
open ViewModelStore

Returns the ViewModelStore associated with this Fragment

Public constructors

AbstractListDetailFragment

Added in 2.4.0
AbstractListDetailFragment()

Public functions

onCreateDetailPaneNavHostFragment

Added in 2.4.0
open fun onCreateDetailPaneNavHostFragment(): NavHostFragment

Return an alternative NavHostFragment to swap the default NavHostFragment in the fragment. This method get called when creating the view of the fragment.

onCreateListPaneView

Added in 2.4.0
abstract fun onCreateListPaneView(
    inflater: LayoutInflater,
    container: ViewGroup?,
    savedInstanceState: Bundle?
): View

Provide a list pane view for the fragment. Called when creating the view of the fragment.

Parameters
inflater: LayoutInflater

The LayoutInflater that used to inflate the list pane view.

container: ViewGroup?

The parent view of the list pane view. The parent view can be used to generate the LayoutParams of the view.

savedInstanceState: Bundle?

The previous saved state of the fragment.

Returns
View

Return the list pane view for the fragment.

onCreateView

Added in 2.4.0
@CallSuper
final fun onCreateView(
    inflater: LayoutInflater,
    container: ViewGroup?,
    savedInstanceState: Bundle?
): View

Create the view for the fragment. This method provides two callbacks to instantiate a list pane view and a NavHostFragment to control navigation between different detail views.

Parameters
inflater: LayoutInflater

The LayoutInflater that used to inflate the fragment's views.

container: ViewGroup?

The parent view that the fragment's UI should be attached to.

savedInstanceState: Bundle?

The previous saved state of the fragment.

Returns
View

Return the view for the fragment's UI

onInflate

@CallSuper
open fun onInflate(
    context: Context,
    attrs: AttributeSet,
    savedInstanceState: Bundle?
): Unit

Called when a fragment is being created as part of a view layout inflation, typically from setting the content view of an activity. This may be called immediately after the fragment is created from a FragmentContainerView in a layout file. Note this is before the fragment's onAttach has been called; all you should do here is parse the attributes and save them away.

This is called the first time the fragment is inflated. If it is being inflated into a new instance with saved state, this method will not be called a second time for the restored state fragment.

Here is a typical implementation of a fragment that can take parameters both through attributes supplied here as well from getArguments:

public static class MyFragment extends Fragment {
    CharSequence mLabel;

    /**
     * Create a new instance of MyFragment that will be initialized
     * with the given arguments.
     */
    static MyFragment newInstance(CharSequence label) {
        MyFragment f = new MyFragment();
        Bundle b = new Bundle();
        b.putCharSequence("label", label);
        f.setArguments(b);
        return f;
    }

    /**
     * Parse attributes during inflation from a view hierarchy into the
     * arguments we handle.
     */
    @Override
    public void onInflate(@NonNull Context context, @NonNull AttributeSet attrs,
            @Nullable Bundle savedInstanceState) {
        super.onInflate(context, attrs, savedInstanceState);

        TypedArray a = context.obtainStyledAttributes(attrs,
                R.styleable.FragmentArguments);
        mLabel = a.getText(R.styleable.FragmentArguments_android_label);
        a.recycle();
    }

    /**
     * During creation, if arguments have been supplied to the fragment
     * then parse those out.
     */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        Bundle args = getArguments();
        if (args != null) {
            CharSequence label = args.getCharSequence("label");
            if (label != null) {
                mLabel = label;
            }
        }
    }

    /**
     * Create the view for this fragment, using the arguments given to it.
     */
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        View v = inflater.inflate(R.layout.hello_world, container, false);
        View tv = v.findViewById(R.id.text);
        ((TextView)tv).setText(mLabel != null ? mLabel : "(no label)");
        ViewCompat.setBackground(
                tv, ContextCompat.getDrawable(getContext(), android.R.drawable.gallery_thumb));
        return v;
    }
}

Note that parsing the XML attributes uses a "styleable" resource. The declaration for the styleable used here is:

<declare-styleable name="FragmentArguments">
    <attr name="android:label" />
</declare-styleable>

The fragment can then be declared within its activity's content layout through a tag like this:

<androidx.fragment.app.FragmentContainerView
        class="com.example.android.supportv4.app.FragmentArgumentsSupport$MyFragment"
        android:id="@+id/embedded"
        android:layout_width="0px" android:layout_height="wrap_content"
        android:layout_weight="1"
        android:label="@string/fragment_arguments_embedded" />

This fragment can also be created dynamically from arguments given at runtime in the arguments Bundle; here is an example of doing so at creation of the containing activity:

@Override protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.fragment_arguments_support);

    if (savedInstanceState == null) {
        // First-time init; create fragment to embed in activity.
        FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
        Fragment newFragment = MyFragment.newInstance("From Arguments");
        ft.add(R.id.created, newFragment);
        ft.commit();
    }
}
Parameters
context: Context

The Activity that is inflating this fragment.

attrs: AttributeSet

The attributes at the tag where the fragment is being created.

savedInstanceState: Bundle?

If the fragment is being re-created from a previous saved state, this is the state.

onListPaneViewCreated

Added in 2.4.0
open fun onListPaneViewCreated(view: View, savedInstanceState: Bundle?): Unit

Provides list pane view created in the fragment. Called when the fragment's onViewCreated get called.

Parameters
view: View

The list pane view created by onCreateListPaneView and added to view hierarchy

savedInstanceState: Bundle?

The previous saved state of the fragment.

onSaveInstanceState

@CallSuper
open fun onSaveInstanceState(outState: Bundle): Unit

Called to ask the fragment to save its current dynamic state, so it can later be reconstructed in a new instance if its process is restarted. If a new instance of the fragment later needs to be created, the data you place in the Bundle here will be available in the Bundle given to onCreate, onCreateView, and onViewCreated.

This corresponds to Activity.onSaveInstanceState(Bundle) and most of the discussion there applies here as well. Note however: this method may be called at any time before onDestroy. There are many situations where a fragment may be mostly torn down (such as when placed on the back stack with no UI showing), but its state will not be saved until its owning activity actually needs to save its state.

Parameters
outState: Bundle

Bundle in which to place your saved state.

onViewCreated

Added in 2.4.0
@CallSuper
final fun onViewCreated(view: View, savedInstanceState: Bundle?): Unit

This method provides a callback onListPaneViewCreated after the view hierarchy has been completely created.

Parameters
view: View

The view returned by onCreateView

savedInstanceState: Bundle?

The previous saved state of the fragment.

onViewStateRestored

@CallSuper
open fun onViewStateRestored(savedInstanceState: Bundle?): Unit

Called when all saved state has been restored into the view hierarchy of the fragment. This can be used to do initialization based on saved state that you are letting the view hierarchy track itself, such as whether check box widgets are currently checked. This is called after onViewCreated and before onStart.

Parameters
savedInstanceState: Bundle?

If the fragment is being re-created from a previous saved state, this is the state.

Public properties

detailPaneNavHostFragment

Added in 2.4.0
val detailPaneNavHostFragmentNavHostFragment

Return the NavHostFragment this fragment uses

Throws
kotlin.IllegalStateException

if the NavHostFragment has not been created by {@link #onCreateView}.

slidingPaneLayout

Added in 2.4.0
val slidingPaneLayoutSlidingPaneLayout

Return the SlidingPaneLayout this fragment is currently controlling.

Throws
kotlin.IllegalStateException

if the SlidingPaneLayout has not been created by onCreateView