LeanbackSettingsFragmentCompat


public abstract class LeanbackSettingsFragmentCompat extends Fragment implements PreferenceFragmentCompat.OnPreferenceStartFragmentCallback, PreferenceFragmentCompat.OnPreferenceStartScreenCallback, PreferenceFragmentCompat.OnPreferenceDisplayDialogCallback


This fragment provides a container for displaying a LeanbackPreferenceFragmentCompat

The following sample code shows a simple leanback preference fragment that is populated from a resource. The resource it loads is:

<PreferenceScreen
        xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:app="http://schemas.android.com/apk/res-auto">

    <PreferenceCategory
            android:title="@string/basic_preferences">

        <Preference
                android:key="preference"
                android:title="@string/title_basic_preference"
                android:summary="@string/summary_basic_preference"/>

        <Preference
                android:key="stylized"
                android:title="@string/title_stylish_preference"
                android:summary="@string/summary_stylish_preference"/>

        <Preference
                android:key="icon"
                android:title="@string/title_icon_preference"
                android:summary="@string/summary_icon_preference"
                android:icon="@android:drawable/ic_menu_camera"/>

        <Preference
                android:key="single_line_title"
                android:title="@string/title_single_line_title_preference"
                android:summary="@string/summary_single_line_title_preference"
                app:singleLineTitle="true"/>
    </PreferenceCategory>

    <PreferenceCategory
            android:title="@string/widgets">

        <CheckBoxPreference
                android:key="checkbox"
                android:title="@string/title_checkbox_preference"
                android:summary="@string/summary_checkbox_preference"/>

        <SwitchPreferenceCompat
                android:key="switch"
                android:title="@string/title_switch_preference"
                android:summary="@string/summary_switch_preference"/>

        <DropDownPreference
                android:key="dropdown"
                android:title="@string/title_dropdown_preference"
                android:entries="@array/entries"
                app:useSimpleSummaryProvider="true"
                android:entryValues="@array/entry_values"/>

        <SeekBarPreference
                android:key="seekbar"
                android:title="@string/title_seekbar_preference"
                android:max="10"
                android:defaultValue="5"/>
    </PreferenceCategory>

    <PreferenceCategory
            android:title="@string/dialogs">

        <EditTextPreference
                android:key="edittext"
                android:title="@string/title_edittext_preference"
                app:useSimpleSummaryProvider="true"
                android:dialogTitle="@string/dialog_title_edittext_preference"/>

        <ListPreference
                android:key="list"
                android:title="@string/title_list_preference"
                app:useSimpleSummaryProvider="true"
                android:entries="@array/entries"
                android:entryValues="@array/entry_values"
                android:dialogTitle="@string/dialog_title_list_preference"/>

        <MultiSelectListPreference
                android:key="multi_select_list"
                android:title="@string/title_multi_list_preference"
                android:summary="@string/summary_multi_list_preference"
                android:entries="@array/entries"
                android:entryValues="@array/entry_values"
                android:dialogTitle="@string/dialog_title_multi_list_preference"/>
    </PreferenceCategory>

    <PreferenceCategory
            android:key="advanced"
            android:title="@string/advanced_attributes"
            app:initialExpandedChildrenCount="1">

        <Preference
                android:key="expandable"
                android:title="@string/title_expandable_preference"
                android:summary="@string/summary_expandable_preference"/>

        <Preference
                android:title="@string/title_intent_preference"
                android:summary="@string/summary_intent_preference">

            <intent android:action="android.intent.action.VIEW"
                    android:data="http://www.android.com"/>

        </Preference>

        <SwitchPreferenceCompat
                android:key="parent"
                android:title="@string/title_parent_preference"
                android:summary="@string/summary_parent_preference"/>

        <SwitchPreferenceCompat
                android:key="child"
                android:dependency="parent"
                android:title="@string/title_child_preference"
                android:summary="@string/summary_child_preference"/>

        <SwitchPreferenceCompat
                android:key="toggle_summary"
                android:title="@string/title_toggle_summary_preference"
                android:summaryOn="@string/summary_on_toggle_summary_preference"
                android:summaryOff="@string/summary_off_toggle_summary_preference"/>

        <Preference
                android:key="copyable"
                android:title="@string/title_copyable_preference"
                android:summary="@string/summary_copyable_preference"
                android:selectable="false"
                app:enableCopying="true"/>
    </PreferenceCategory>

</PreferenceScreen>

The sample implements onPreferenceStartFragment, onPreferenceStartScreen, and onPreferenceStartInitialScreen:

public static class SettingsFragment extends LeanbackSettingsFragmentCompat {
    @Override
    public void onPreferenceStartInitialScreen() {
        startPreferenceFragment(new DemoFragment());
    }

    @Override
    public boolean onPreferenceStartFragment(PreferenceFragmentCompat caller, Preference pref) {
        final Bundle args = pref.getExtras();
        final Fragment f = getChildFragmentManager().getFragmentFactory().instantiate(
                requireActivity().getClassLoader(), pref.getFragment());
        f.setArguments(args);
        f.setTargetFragment(caller, 0);
        if (f instanceof PreferenceFragmentCompat
                || f instanceof PreferenceDialogFragmentCompat) {
            startPreferenceFragment(f);
        } else {
            startImmersiveFragment(f);
        }
        return true;
    }

    @Override
    public boolean onPreferenceStartScreen(PreferenceFragmentCompat caller,
            PreferenceScreen pref) {
        final Fragment fragment = new DemoFragment();
        final Bundle args = new Bundle(1);
        args.putString(PreferenceFragmentCompat.ARG_PREFERENCE_ROOT, pref.getKey());
        fragment.setArguments(args);
        startPreferenceFragment(fragment);
        return true;
    }
}

/**
 * The fragment that is embedded in SettingsFragment
 */
public static class DemoFragment extends LeanbackPreferenceFragmentCompat {

    @Override
    public void onCreatePreferences(Bundle savedInstanceState, String rootKey) {
        // Load the preferences from an XML resource
        setPreferencesFromResource(R.xml.preferences, rootKey);
    }
}

Summary

Public constructors

Public methods

View
onCreateView(
    @NonNull LayoutInflater inflater,
    ViewGroup container,
    Bundle savedInstanceState
)

Called to have the fragment instantiate its user interface view.

void

Called when the Fragment is no longer resumed.

boolean
abstract void

Called to instantiate the initial PreferenceFragment to be shown in this fragment.

void

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

void
onViewCreated(@NonNull View view, Bundle savedInstanceState)

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

void

Displays a fragment to the user, temporarily replacing the contents of this fragment.

void

Displays a preference fragment to the user.

Inherited methods

From androidx.activity.result.ActivityResultCaller
abstract ActivityResultLauncher<I>
<I, O> registerForActivityResult(
    ActivityResultContract<I, O> contract,
    ActivityResultCallback<O> callback
)

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

From android.content.ComponentCallbacks
abstract void
abstract void
From androidx.fragment.app.Fragment
void
dump(
    @NonNull String prefix,
    @Nullable FileDescriptor fd,
    @NonNull PrintWriter writer,
    @Nullable String[] args
)

Print the Fragments's state into the given stream.

final boolean

Subclasses can not override equals().

final @Nullable FragmentActivity

Return the FragmentActivity this fragment is currently associated with.

boolean

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

boolean

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

final @Nullable Bundle

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

final @NonNull FragmentManager

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

@Nullable Context

Return the Context this fragment is currently associated with.

@NonNull 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.

@NonNull ViewModelProvider.Factory
@Nullable Object

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

@Nullable Object

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.

final @Nullable FragmentManager

This method is deprecated.

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

final @Nullable Object

Return the host object of this fragment.

final int

Return the identifier this fragment is known by.

final @NonNull LayoutInflater

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

@NonNull Lifecycle

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

@NonNull LoaderManager

This method is deprecated.

Use LoaderManager.getInstance(this).

final @Nullable Fragment

Returns the parent Fragment containing this Fragment.

final @NonNull FragmentManager

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

@Nullable Object

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

final @NonNull Resources

Return requireActivity().getResources().

final boolean

This method is deprecated.

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

@Nullable Object

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.

final @NonNull SavedStateRegistry
@Nullable Object

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

@Nullable Object

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

final @NonNull String
getString(@StringRes int resId)

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

final @NonNull String
getString(@StringRes int resId, @Nullable Object[] formatArgs)

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.

final @Nullable String

Get the tag name of the fragment, if specified.

final @Nullable Fragment

This method 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.

final int

This method 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.

final @NonNull CharSequence
getText(@StringRes int resId)

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

boolean

This method is deprecated.

Use setMaxLifecycle instead.

@Nullable View

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

@NonNull LifecycleOwner

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

@NonNull LiveData<LifecycleOwner>

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

@NonNull ViewModelStore

Returns the ViewModelStore associated with this Fragment

final int

Subclasses can not override hashCode().

static @NonNull Fragment

This method is deprecated.

Use getFragmentFactory and instantiate

static @NonNull Fragment
instantiate(
    @NonNull Context context,
    @NonNull String fname,
    @Nullable Bundle args
)

This method is deprecated.

Use getFragmentFactory and instantiate, manually calling setArguments on the returned Fragment.

final boolean

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

final boolean

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

final boolean

Return true if the fragment has been hidden.

final boolean

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

final boolean

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

final boolean

Return true if the fragment is in the resumed state.

final boolean

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

final boolean

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

void

This method is deprecated.

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

void
onActivityResult(int requestCode, int resultCode, @Nullable Intent data)

This method 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.

void

This method is deprecated.

See onAttach.

void

Called when a fragment is first attached to its context.

void

This method is deprecated.

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

void
boolean

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

void

Called to do initial creation of a fragment.

@Nullable Animation
@MainThread
onCreateAnimation(int transit, boolean enter, int nextAnim)

Called when a fragment loads an animation.

@Nullable Animator
@MainThread
onCreateAnimator(int transit, boolean enter, int nextAnim)

Called when a fragment loads an animator.

void

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

void

This method 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.

void

Called when the fragment is no longer in use.

void

This method 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.

void

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

void

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

@NonNull LayoutInflater
onGetLayoutInflater(@Nullable Bundle savedInstanceState)

Returns the LayoutInflater used to inflate Views of this Fragment.

void
@MainThread
onHiddenChanged(boolean hidden)

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

void
@UiThread
@CallSuper
onInflate(
    @NonNull Activity activity,
    @NonNull AttributeSet attrs,
    @Nullable Bundle savedInstanceState
)

This method is deprecated.

See onInflate.

void
@UiThread
@CallSuper
onInflate(
    @NonNull Context context,
    @NonNull AttributeSet attrs,
    @Nullable Bundle savedInstanceState
)

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

void
void
onMultiWindowModeChanged(boolean isInMultiWindowMode)

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

boolean

This method 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.

void

This method 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.

void
onPictureInPictureModeChanged(boolean isInPictureInPictureMode)

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

void

This method 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.

void
@MainThread
onPrimaryNavigationFragmentChanged(
    boolean isPrimaryNavigationFragment
)

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

void
onRequestPermissionsResult(
    int requestCode,
    @NonNull String[] permissions,
    @NonNull int[] grantResults
)

This method 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.

void

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.

void

Called when the Fragment is visible to the user.

void

Called when the Fragment is no longer started.

void

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

void

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

final void
postponeEnterTransition(long duration, @NonNull TimeUnit timeUnit)

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

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

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

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

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

void

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

final void
requestPermissions(@NonNull String[] permissions, int requestCode)

This method 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.

final @NonNull FragmentActivity

Return the FragmentActivity this fragment is currently associated with.

final @NonNull Bundle

Return the arguments supplied when the fragment was instantiated.

final @NonNull Context

Return the Context this fragment is currently associated with.

final @NonNull FragmentManager

This method 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.

final @NonNull Object

Return the host object of this fragment.

final @NonNull Fragment

Returns the parent Fragment containing this Fragment.

final @NonNull View

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

void

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

void

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

void

Supply the construction arguments for this fragment.

void

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.

void

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

void

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.

void

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.

void
setHasOptionsMenu(boolean hasMenu)

This method 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.

void

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

void
setMenuVisibility(boolean menuVisible)

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

void

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

void
setRetainInstance(boolean retain)

This method is deprecated.

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

void

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.

void

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

void

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

void
setTargetFragment(@Nullable Fragment fragment, int requestCode)

This method 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.

void
setUserVisibleHint(boolean isVisibleToUser)

This method is deprecated.

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

boolean

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

void

Call startActivity from the fragment's containing Activity.

void

Call startActivity from the fragment's containing Activity.

void
startActivityForResult(@NonNull Intent intent, int requestCode)

This method 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.

void
startActivityForResult(
    @NonNull Intent intent,
    int requestCode,
    @Nullable Bundle options
)

This method 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.

void
startIntentSenderForResult(
    @NonNull IntentSender intent,
    int requestCode,
    @Nullable Intent fillInIntent,
    int flagsMask,
    int flagsValues,
    int extraFlags,
    @Nullable Bundle options
)

This method 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.

void

Begin postponed transitions after postponeEnterTransition was called.

@NonNull String
void

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

From androidx.lifecycle.HasDefaultViewModelProviderFactory
From androidx.lifecycle.LifecycleOwner
abstract Lifecycle
From androidx.preference.PreferenceFragmentCompat.OnPreferenceStartFragmentCallback
abstract boolean

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

From androidx.preference.PreferenceFragmentCompat.OnPreferenceStartScreenCallback
abstract boolean

Called when the user has clicked on a PreferenceScreen in order to navigate to a new screen of preferences.

From androidx.savedstate.SavedStateRegistryOwner
From android.view.View.OnCreateContextMenuListener
abstract void
From androidx.lifecycle.ViewModelStoreOwner

Public constructors

LeanbackSettingsFragmentCompat

Added in 1.1.0
public LeanbackSettingsFragmentCompat()

Public methods

onCreateView

public View onCreateView(
    @NonNull LayoutInflater inflater,
    ViewGroup container,
    Bundle savedInstanceState
)

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
@NonNull LayoutInflater inflater

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

ViewGroup container

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.

Bundle savedInstanceState

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.

onPause

public void onPause()

Called when the Fragment is no longer resumed. This is generally tied to Activity.onPause of the containing Activity's lifecycle.

onPreferenceDisplayDialog

Added in 1.1.0
public boolean onPreferenceDisplayDialog(
    @NonNull PreferenceFragmentCompat caller,
    Preference pref
)
Parameters
@NonNull PreferenceFragmentCompat caller

The fragment containing the preference requesting the dialog

Preference pref

The preference requesting the dialog

Returns
boolean

true if the dialog creation has been handled

onPreferenceStartInitialScreen

Added in 1.1.0
public abstract void onPreferenceStartInitialScreen()

Called to instantiate the initial PreferenceFragment to be shown in this fragment. Implementations are expected to call startPreferenceFragment.

onResume

public void onResume()

Called when the fragment is visible to the user and actively running. This is generally tied to Activity.onResume of the containing Activity's lifecycle.

onViewCreated

public void onViewCreated(@NonNull View view, Bundle savedInstanceState)

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
@NonNull View view

The View returned by onCreateView.

Bundle savedInstanceState

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

startImmersiveFragment

Added in 1.1.0
public void startImmersiveFragment(@NonNull Fragment fragment)

Displays a fragment to the user, temporarily replacing the contents of this fragment.

Parameters
@NonNull Fragment fragment

Fragment instance to be added.

startPreferenceFragment

Added in 1.1.0
public void startPreferenceFragment(@NonNull Fragment fragment)

Displays a preference fragment to the user. This method can also be used to display list-style fragments on top of the stack of preference fragments.

Parameters
@NonNull Fragment fragment

Fragment instance to be added.