Methods
public View	onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) Called to have the fragment instantiate its user interface view.
public void	onViewCreated(View view, Bundle savedInstanceState) Called immediately after Fragment.onCreateView(LayoutInflater, ViewGroup, Bundle) has returned, but before any saved state has been restored in to the view.
public void	setTitle(java.lang.CharSequence title) Set the title to be shown above the preference list
from BaseLeanbackPreferenceFragmentCompat	getCallbackFragment, getContext, onCreateRecyclerView
from PreferenceFragmentCompat	addPreferencesFromResource, findPreference, getListView, getPreferenceManager, getPreferenceScreen, onBindPreferences, onCreate, onCreateAdapter, onCreateLayoutManager, onCreatePreferences, onDestroyView, onDisplayPreferenceDialog, onNavigateToScreen, onPreferenceTreeClick, onSaveInstanceState, onStart, onStop, onUnbindPreferences, scrollToPreference, scrollToPreference, setDivider, setDividerHeight, setPreferenceScreen, setPreferencesFromResource
from Fragment	dump, equals, getActivity, getAllowEnterTransitionOverlap, getAllowReturnTransitionOverlap, getArguments, getChildFragmentManager, getDefaultViewModelCreationExtras, getDefaultViewModelProviderFactory, getEnterTransition, getExitTransition, getFragmentManager, getHost, getId, getLayoutInflater, getLayoutInflater, getLifecycle, getLoaderManager, getParentFragment, getParentFragmentManager, getReenterTransition, getResources, getRetainInstance, getReturnTransition, getSavedStateRegistry, getSharedElementEnterTransition, getSharedElementReturnTransition, getString, getString, getTag, getTargetFragment, getTargetRequestCode, getText, getUserVisibleHint, getView, getViewLifecycleOwner, getViewLifecycleOwnerLiveData, getViewModelStore, hashCode, hasOptionsMenu, instantiate, instantiate, isAdded, isDetached, isHidden, isInLayout, isMenuVisible, isRemoving, isResumed, isStateSaved, isVisible, onActivityCreated, onActivityResult, onAttach, onAttach, onAttachFragment, onConfigurationChanged, onContextItemSelected, onCreateAnimation, onCreateAnimator, onCreateContextMenu, onCreateOptionsMenu, onDestroy, onDestroyOptionsMenu, onDetach, onGetLayoutInflater, onHiddenChanged, onInflate, onInflate, onLowMemory, onMultiWindowModeChanged, onOptionsItemSelected, onOptionsMenuClosed, onPause, onPictureInPictureModeChanged, onPrepareOptionsMenu, onPrimaryNavigationFragmentChanged, onRequestPermissionsResult, onResume, onViewStateRestored, postponeEnterTransition, postponeEnterTransition, registerForActivityResult, registerForActivityResult, registerForContextMenu, requestPermissions, requireActivity, requireArguments, requireContext, requireFragmentManager, requireHost, requireParentFragment, requireView, setAllowEnterTransitionOverlap, setAllowReturnTransitionOverlap, setArguments, setEnterSharedElementCallback, setEnterTransition, setExitSharedElementCallback, setExitTransition, setHasOptionsMenu, setInitialSavedState, setMenuVisibility, setReenterTransition, setRetainInstance, setReturnTransition, setSharedElementEnterTransition, setSharedElementReturnTransition, setTargetFragment, setUserVisibleHint, shouldShowRequestPermissionRationale, startActivity, startActivity, startActivityForResult, startActivityForResult, startIntentSenderForResult, startPostponedEnterTransition, toString, unregisterForContextMenu
from java.lang.Object	clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructors

public LeanbackPreferenceFragmentCompat()

Methods

public View onCreateView(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 Fragment.onCreate(Bundle) and Fragment.onViewCreated(View, Bundle).

A default View can be returned by calling Fragment.Fragment(int) 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 Fragment.onViewCreated(View, Bundle).

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

Parameters:

inflater: The LayoutInflater object that can be used to inflate any views in the fragment,
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.
savedInstanceState: If non-null, this fragment is being re-constructed from a previous saved state as given here.

Returns:

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

public void onViewCreated(View view, Bundle savedInstanceState)

Called immediately after Fragment.onCreateView(LayoutInflater, ViewGroup, Bundle) 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: The View returned by Fragment.onCreateView(LayoutInflater, ViewGroup, Bundle).
savedInstanceState: If non-null, this fragment is being re-constructed from a previous saved state as given here.

public void setTitle(java.lang.CharSequence title)

Set the title to be shown above the preference list

Parameters:

title: Title text to be shown

Source

/*
 * Copyright 2018 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package androidx.leanback.preference;

import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

import androidx.annotation.NonNull;

/**
 * This fragment provides a fully decorated leanback-style preference fragment, including a
 * list background and header.
 *
 * <p>The following sample code shows a simple leanback preference fragment that is
 * populated from a resource.  The resource it loads is:</p>
 *
 * {@sample frameworks/support/samples/SupportPreferenceDemos/src/main/res/xml/preferences.xml preferences}
 *
 * <p>The fragment needs only to implement {@link #onCreatePreferences(Bundle, String)} to populate
 * the list of preference objects:</p>
 *
 * {@sample frameworks/support/samples/SupportPreferenceDemos/src/main/java/com/example/androidx/preference/LeanbackPreferences.java leanback_preferences}
 */
public abstract class LeanbackPreferenceFragmentCompat extends
        BaseLeanbackPreferenceFragmentCompat {

    public LeanbackPreferenceFragmentCompat() {
        LeanbackPreferenceFragmentTransitionHelperApi21.addTransitions(this);
    }

    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        final View innerView = super.onCreateView(inflater, container, savedInstanceState);
        // parent class would create a themed context based the preferenceTheme attr.
        LayoutInflater themedInflater = LayoutInflater.from(innerView.getContext());
        final View view = themedInflater.inflate(R.layout.leanback_preference_fragment, container,
                false);
        final ViewGroup innerContainer = (ViewGroup) view.findViewById(R.id.main_frame);
        if (innerView != null) {
            innerContainer.addView(innerView);
        }
        return view;
    }

    @Override
    public void onViewCreated(@NonNull View view, Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);
        setTitle(getPreferenceScreen().getTitle());
    }

    /**
     * Set the title to be shown above the preference list
     *
     * @param title Title text to be shown
     */
    public void setTitle(CharSequence title) {
        final View view = getView();
        final TextView decorTitle = view == null
                ? null : (TextView) view.findViewById(R.id.decor_title);
        if (decorTitle != null) {
            decorTitle.setText(title);
        }
    }
}