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 */ 14package android.support.v17.leanback.app; 15 16import android.app.Fragment; 17 18/** 19 * Fragment used by the background manager. 20 * @hide 21 */ 22public final class BackgroundFragment extends Fragment implements 23 BackgroundManager.FragmentStateQueriable { 24 private BackgroundManager mBackgroundManager; 25 26 void setBackgroundManager(BackgroundManager backgroundManager) { 27 mBackgroundManager = backgroundManager; 28 } 29 30 BackgroundManager getBackgroundManager() { 31 return mBackgroundManager; 32 } 33 34 @Override 35 public void onStart() { 36 super.onStart(); 37 // mBackgroundManager might be null: 38 // if BackgroundFragment is just restored by FragmentManager, 39 // and user does not call BackgroundManager.getInstance() yet. 40 if (mBackgroundManager != null) { 41 mBackgroundManager.onActivityStart(); 42 } 43 } 44 45 @Override 46 public void onResume() { 47 super.onResume(); 48 // mBackgroundManager might be null: 49 // if BackgroundFragment is just restored by FragmentManager, 50 // and user does not call BackgroundManager.getInstance() yet. 51 if (mBackgroundManager != null) { 52 mBackgroundManager.onResume(); 53 } 54 } 55 56 @Override 57 public void onDestroy() { 58 super.onDestroy(); 59 // mBackgroundManager might be null: 60 // if BackgroundFragment is just restored by FragmentManager, 61 // and user does not call BackgroundManager.getInstance() yet. 62 if (mBackgroundManager != null) { 63 mBackgroundManager.detach(); 64 } 65 } 66} 67