1 /* 2 * Copyright (C) 2014 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except 5 * in compliance with the License. You may obtain a copy of the License at 6 * 7 * http://www.apache.org/licenses/LICENSE-2.0 8 * 9 * Unless required by applicable law or agreed to in writing, software distributed under the License 10 * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express 11 * or implied. See the License for the specific language governing permissions and limitations under 12 * the License. 13 */ 14 package androidx.leanback.app; 15 16 import static androidx.annotation.RestrictTo.Scope.LIBRARY_GROUP; 17 18 import android.app.Fragment; 19 20 import androidx.annotation.RestrictTo; 21 22 /** 23 * Fragment used by the background manager. 24 * @hide 25 */ 26 @RestrictTo(LIBRARY_GROUP) 27 public final class BackgroundFragment extends Fragment { 28 private BackgroundManager mBackgroundManager; 29 setBackgroundManager(BackgroundManager backgroundManager)30 void setBackgroundManager(BackgroundManager backgroundManager) { 31 mBackgroundManager = backgroundManager; 32 } 33 getBackgroundManager()34 BackgroundManager getBackgroundManager() { 35 return mBackgroundManager; 36 } 37 38 @Override onStart()39 public void onStart() { 40 super.onStart(); 41 // mBackgroundManager might be null: 42 // if BackgroundFragment is just restored by FragmentManager, 43 // and user does not call BackgroundManager.getInstance() yet. 44 if (mBackgroundManager != null) { 45 mBackgroundManager.onActivityStart(); 46 } 47 } 48 49 @Override onResume()50 public void onResume() { 51 super.onResume(); 52 // mBackgroundManager might be null: 53 // if BackgroundFragment is just restored by FragmentManager, 54 // and user does not call BackgroundManager.getInstance() yet. 55 if (mBackgroundManager != null) { 56 mBackgroundManager.onResume(); 57 } 58 } 59 60 @Override onStop()61 public void onStop() { 62 if (mBackgroundManager != null) { 63 mBackgroundManager.onStop(); 64 } 65 super.onStop(); 66 } 67 68 @Override onDestroy()69 public void onDestroy() { 70 super.onDestroy(); 71 // mBackgroundManager might be null: 72 // if BackgroundFragment is just restored by FragmentManager, 73 // and user does not call BackgroundManager.getInstance() yet. 74 if (mBackgroundManager != null) { 75 mBackgroundManager.detach(); 76 } 77 } 78 } 79