| /* |
| * Copyright (C) 2021 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 com.android.settingslib.collapsingtoolbar; |
| |
| import androidx.fragment.app.FragmentActivity; |
| import androidx.preference.PreferenceFragmentCompat; |
| |
| import com.android.settingslib.utils.BuildCompatUtils; |
| import com.android.settingslib.widget.R; |
| |
| import com.google.android.material.appbar.AppBarLayout; |
| |
| /** |
| * A base fragment that supports multi-fragments in one activity. The activity likes to switch the |
| * different fragments which extend this base fragment and must use the following code to add the |
| * fragment to stack. |
| * |
| * protected void onCreate(Bundle savedState) { |
| * // omitted… |
| * getFragmentManager() |
| * .beginTransaction() |
| * .add(R.id.content_frame, new Your_Fragment()) |
| * // Add root page to back-history |
| * .addToBackStack( null) |
| * .commit(); |
| * // omitted |
| * } |
| */ |
| public abstract class BasePreferencesFragment extends PreferenceFragmentCompat { |
| |
| /** |
| * Gets the title which the fragment likes to show on app bar. The child class must implement |
| * this |
| * function. |
| * |
| * @return The title of the fragment will show on app bar. |
| */ |
| public abstract CharSequence getTitle(); |
| |
| @Override |
| public void onResume() { |
| super.onResume(); |
| |
| FragmentActivity activity = getActivity(); |
| if (activity != null) { |
| activity.setTitle(getTitle()); |
| |
| if (BuildCompatUtils.isAtLeastS()) { |
| AppBarLayout appBarLayout = (AppBarLayout) activity.findViewById(R.id.app_bar); |
| |
| if (appBarLayout != null) { |
| appBarLayout.setExpanded(/* expanded= */ true); |
| } |
| } |
| } |
| } |
| } |