FragmentHostCallback

Kotlin |Java

abstract class FragmentHostCallback<E : Any!> : FragmentContainer

kotlin.Any
↳	androidx.fragment.app.FragmentContainer
	↳	androidx.fragment.app.FragmentHostCallback

Integration points with the Fragment host.

Fragments may be hosted by any object; such as an Activity. In order to host fragments, implement FragmentHostCallback, overriding the methods applicable to the host.

FragmentManager changes its behavior based on what optional interfaces your FragmentHostCallback implements. This includes the following:

• ActivityResultRegistryOwner: Removes the need to override onStartIntentSenderFromFragment or onRequestPermissionsFromFragment.
• FragmentOnAttachListener: Removes the need to manually call FragmentManager#addFragmentOnAttachListener from your host in order to receive FragmentOnAttachListener#onAttachFragment callbacks for the FragmentController#getSupportFragmentManager().
• androidx.activity.OnBackPressedDispatcherOwner: Removes the need to manually call FragmentManager#popBackStackImmediate() when handling the system back button.
• androidx.lifecycle.ViewModelStoreOwner: Removes the need for your FragmentController to call FragmentController#retainNestedNonConfig() or FragmentController#restoreAllState(Parcelable, FragmentManagerNonConfig).

Summary

Public constructors
<init>(@NonNull context: Context, @NonNull handler: Handler, windowAnimations: Int)

Public methods
open Unit	onDump(@NonNull prefix: String, @Nullable fd: FileDescriptor?, @NonNull writer: PrintWriter, @Nullable args: Array<String!>?) Print internal state into the given stream.
open View?	onFindViewById(id: Int)
abstract E?	onGetHost() Return the object that's currently hosting the fragment.
open LayoutInflater	onGetLayoutInflater() Return a LayoutInflater.
open Int	onGetWindowAnimations() Return the window animations.
open Boolean	onHasView()
open Boolean	onHasWindowAnimations() Return true if there are window animations.
open Unit	onRequestPermissionsFromFragment(@NonNull fragment: Fragment, @NonNull permissions: Array<String!>, requestCode: Int) Requests permissions from the given fragment.
open Boolean	onShouldSaveFragmentState(@NonNull fragment: Fragment) Return true if the fragment's state needs to be saved.
open Boolean	onShouldShowRequestPermissionRationale(@NonNull permission: String) Checks whether to show permission rationale UI from a fragment.
open Unit	onStartActivityFromFragment(@NonNull fragment: Fragment, intent: Intent!, requestCode: Int) Starts a new Activity from the given fragment.
open Unit	onStartActivityFromFragment(@NonNull fragment: Fragment, intent: Intent!, requestCode: Int, @Nullable options: Bundle?) Starts a new Activity from the given fragment.
open Unit	onStartIntentSenderFromFragment(@NonNull fragment: Fragment, intent: IntentSender!, requestCode: Int, @Nullable fillInIntent: Intent?, flagsMask: Int, flagsValues: Int, extraFlags: Int, @Nullable options: Bundle?) Starts a new IntentSender from the given fragment.
open Unit	onSupportInvalidateOptionsMenu() Invalidates the activity's options menu.

Inherited functions
From class FragmentContainer Fragment instantiate(@NonNull context: Context, @NonNull className: String, @Nullable arguments: Bundle?) Creates an instance of the specified fragment, can be overridden to construct fragments with dependencies, or change the fragment being constructed. By default just calls Fragment#instantiate(Context, String, Bundle).

Public constructors

<init>

FragmentHostCallback(
    @NonNull context: Context, 
    @NonNull handler: Handler, 
    windowAnimations: Int)

Public methods

onDump

open fun onDump(
    @NonNull prefix: String, 
    @Nullable fd: FileDescriptor?, 
    @NonNull writer: PrintWriter, 
    @Nullable args: Array<String!>?
): Unit

Print internal state into the given stream.

Parameters
prefix	String: Desired prefix to prepend at each line of output.
fd	FileDescriptor?: The raw file descriptor that the dump is being sent to.
writer	PrintWriter: The PrintWriter to which you should dump your state. This will be closed for you after you return.
args	Array<String!>?: additional arguments to the dump request.

onFindViewById

@Nullable open fun onFindViewById(id: Int): View?

onGetHost

@Nullable abstract fun onGetHost(): E?

Return the object that's currently hosting the fragment. If a Fragment is hosted by a FragmentActivity, the object returned here should be the same object returned from Fragment#getActivity().

onGetLayoutInflater

@NonNull open fun onGetLayoutInflater(): LayoutInflater

Return a LayoutInflater. See Activity#getLayoutInflater().

onGetWindowAnimations

open fun onGetWindowAnimations(): Int

Return the window animations.

onHasView

open fun onHasView(): Boolean

onHasWindowAnimations

open fun onHasWindowAnimations(): Boolean

Return true if there are window animations.

onRequestPermissionsFromFragment

open fun onRequestPermissionsFromFragment(
    @NonNull fragment: Fragment, 
    @NonNull permissions: Array<String!>, 
    requestCode: Int
): Unit

Deprecated: Have your FragmentHostCallback implement ActivityResultRegistryOwner to allow Fragments to use Fragment#registerForActivityResult(ActivityResultContract, ActivityResultCallback) with RequestMultiplePermissions. This method will still be called when Fragments call the deprecated requestPermissions() method.

Requests permissions from the given fragment. See FragmentActivity#requestPermissions(String[], int)