PreferenceHeaderFragmentCompat


abstract class PreferenceHeaderFragmentCompat : Fragment, PreferenceFragmentCompat.OnPreferenceStartFragmentCallback


PreferenceHeaderFragmentCompat implements a two-pane fragment for preferences. The list pane is a container of preference headers. Tapping on a preference header swaps out the fragment shown in the detail pane. Subclasses are expected to implement onCreatePreferenceHeader to provide your own PreferenceFragmentCompat in the list pane. The preference header hierarchy is defined by either providing an XML resource or build in code through PreferenceFragmentCompat. In both cases, users need to use a PreferenceScreen as the root component in the hierarchy.

Usage:

class TwoPanePreference : PreferenceHeaderFragmentCompat() {
override fun onCreatePreferenceHeader(): PreferenceFragmentCompat {
return PreferenceHeader()
}
}

PreferenceHeaderFragmentCompat handles the fragment transaction when users defines a fragment or intent associated with the preference header. By default, the initial state fragment for the detail pane is set to the associated fragment that first found in preference headers. You can override onCreateInitialDetailFragment to provide the custom empty state fragment for the detail pane.

Summary

Public constructors

Public functions

open Unit

Called when a fragment is first attached to its context.

open Fragment?

Override this method to set initial detail fragment that to be shown.

abstract PreferenceFragmentCompat

Called to supply the preference header for this fragment.

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

Called to have the fragment instantiate its user interface view.

open Boolean

Called when the user has clicked on a preference that has a fragment class name associated with it.

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

Called immediately after onCreateView has returned, but before any saved state has been restored in to the view.

open Unit
onViewStateRestored(savedInstanceState: Bundle?)

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

Public properties

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

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
@UiThread
@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
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 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.

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

PreferenceHeaderFragmentCompat

Added in 1.2.0
PreferenceHeaderFragmentCompat()

Public functions

onAttach

@CallSuper
open fun onAttach(context: Context): Unit

Called when a fragment is first attached to its context. onCreate will be called after this.

onCreateInitialDetailFragment

Added in 1.2.0
open fun onCreateInitialDetailFragment(): Fragment?

Override this method to set initial detail fragment that to be shown. The default implementation returns the first preference that has a fragment defined on it.

Returns
Fragment?

Fragment The first fragment that found in the list of preference headers.

onCreatePreferenceHeader

Added in 1.2.0
abstract fun onCreatePreferenceHeader(): PreferenceFragmentCompat

Called to supply the preference header for this fragment. The subclasses are expected to call setPreferenceScreen(PreferenceScreen) either directly or via helper methods such as setPreferenceFromResource(int) to set headers.

onCreateView

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

Called to have the fragment instantiate its user interface view. This is optional, and non-graphical fragments can return null. This will be called between onCreate and onViewCreated.

A default View can be returned by calling Fragment in your constructor. Otherwise, this method returns null.

It is recommended to only inflate the layout in this method and move logic that operates on the returned View to onViewCreated.

If you return a View from here, you will later be called in onDestroyView when the view is being released.

Parameters
inflater: LayoutInflater

The LayoutInflater object that can be used to inflate any views in the fragment,

container: ViewGroup?

If non-null, this is the parent view that the fragment's UI should be attached to. The fragment should not add the view itself, but this can be used to generate the LayoutParams of the view.

savedInstanceState: Bundle?

If non-null, this fragment is being re-constructed from a previous saved state as given here.

Returns
View

Return the View for the fragment's UI, or null.

onPreferenceStartFragment

Added in 1.3.0-alpha01
@CallSuper
open fun onPreferenceStartFragment(
    caller: PreferenceFragmentCompat,
    pref: Preference
): Boolean

Called when the user has clicked on a preference that has a fragment class name associated with it. The implementation should instantiate and switch to an instance of the given fragment.

Parameters
caller: PreferenceFragmentCompat

The fragment requesting navigation

pref: Preference

The preference requesting the fragment

Returns
Boolean

true if the fragment creation has been handled

onViewCreated

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

Called immediately after onCreateView has returned, but before any saved state has been restored in to the view. This gives subclasses a chance to initialize themselves once they know their view hierarchy has been completely created. The fragment's view hierarchy is not however attached to its parent at this point.

Parameters
view: View

The View returned by onCreateView.

savedInstanceState: Bundle?

If non-null, this fragment is being re-constructed from a previous saved state as given here.

onViewStateRestored

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

slidingPaneLayout

Added in 1.2.0
val slidingPaneLayoutSlidingPaneLayout

Return the SlidingPaneLayout this fragment is currently controlling.

Throws
kotlin.IllegalStateException

if the SlidingPaneLayout has not been created by onCreateView