1 /* 2 * Copyright (C) 2016 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 package com.android.settings.core.lifecycle; 17 18 import android.annotation.UiThread; 19 import android.content.Context; 20 import android.os.Bundle; 21 import android.support.annotation.Nullable; 22 import android.support.v7.preference.PreferenceScreen; 23 import android.view.Menu; 24 import android.view.MenuInflater; 25 import android.view.MenuItem; 26 27 import com.android.settings.core.lifecycle.events.OnAttach; 28 import com.android.settings.core.lifecycle.events.OnCreate; 29 import com.android.settings.core.lifecycle.events.OnCreateOptionsMenu; 30 import com.android.settings.core.lifecycle.events.OnDestroy; 31 import com.android.settings.core.lifecycle.events.OnOptionsItemSelected; 32 import com.android.settings.core.lifecycle.events.OnPause; 33 import com.android.settings.core.lifecycle.events.OnPrepareOptionsMenu; 34 import com.android.settings.core.lifecycle.events.OnResume; 35 import com.android.settings.core.lifecycle.events.OnSaveInstanceState; 36 import com.android.settings.core.lifecycle.events.OnStart; 37 import com.android.settings.core.lifecycle.events.OnStop; 38 import com.android.settings.core.lifecycle.events.SetPreferenceScreen; 39 import com.android.settings.utils.ThreadUtils; 40 41 import java.util.ArrayList; 42 import java.util.List; 43 44 /** 45 * Dispatcher for lifecycle events. 46 */ 47 public class Lifecycle { 48 49 protected final List<LifecycleObserver> mObservers = new ArrayList<>(); 50 51 /** 52 * Registers a new observer of lifecycle events. 53 */ 54 @UiThread addObserver(T observer)55 public <T extends LifecycleObserver> T addObserver(T observer) { 56 ThreadUtils.ensureMainThread(); 57 mObservers.add(observer); 58 return observer; 59 } 60 onAttach(Context context)61 public void onAttach(Context context) { 62 for (LifecycleObserver observer : mObservers) { 63 if (observer instanceof OnAttach) { 64 ((OnAttach) observer).onAttach(context); 65 } 66 } 67 } 68 onCreate(Bundle savedInstanceState)69 public void onCreate(Bundle savedInstanceState) { 70 for (LifecycleObserver observer : mObservers) { 71 if (observer instanceof OnCreate) { 72 ((OnCreate) observer).onCreate(savedInstanceState); 73 } 74 } 75 } 76 onStart()77 public void onStart() { 78 for (LifecycleObserver observer : mObservers) { 79 if (observer instanceof OnStart) { 80 ((OnStart) observer).onStart(); 81 } 82 } 83 } 84 setPreferenceScreen(PreferenceScreen preferenceScreen)85 public void setPreferenceScreen(PreferenceScreen preferenceScreen) { 86 for (LifecycleObserver observer : mObservers) { 87 if (observer instanceof SetPreferenceScreen) { 88 ((SetPreferenceScreen) observer).setPreferenceScreen(preferenceScreen); 89 } 90 } 91 } 92 onResume()93 public void onResume() { 94 for (LifecycleObserver observer : mObservers) { 95 if (observer instanceof OnResume) { 96 ((OnResume) observer).onResume(); 97 } 98 } 99 } 100 onPause()101 public void onPause() { 102 for (LifecycleObserver observer : mObservers) { 103 if (observer instanceof OnPause) { 104 ((OnPause) observer).onPause(); 105 } 106 } 107 } 108 onSaveInstanceState(Bundle outState)109 public void onSaveInstanceState(Bundle outState) { 110 for (LifecycleObserver observer : mObservers) { 111 if (observer instanceof OnSaveInstanceState) { 112 ((OnSaveInstanceState) observer).onSaveInstanceState(outState); 113 } 114 } 115 } 116 onStop()117 public void onStop() { 118 for (LifecycleObserver observer : mObservers) { 119 if (observer instanceof OnStop) { 120 ((OnStop) observer).onStop(); 121 } 122 } 123 } 124 onDestroy()125 public void onDestroy() { 126 for (LifecycleObserver observer : mObservers) { 127 if (observer instanceof OnDestroy) { 128 ((OnDestroy) observer).onDestroy(); 129 } 130 } 131 } 132 onCreateOptionsMenu(final Menu menu, final @Nullable MenuInflater inflater)133 public void onCreateOptionsMenu(final Menu menu, final @Nullable MenuInflater inflater) { 134 for (LifecycleObserver observer : mObservers) { 135 if (observer instanceof OnCreateOptionsMenu) { 136 ((OnCreateOptionsMenu) observer).onCreateOptionsMenu(menu, inflater); 137 } 138 } 139 } 140 onPrepareOptionsMenu(final Menu menu)141 public void onPrepareOptionsMenu(final Menu menu) { 142 for (LifecycleObserver observer : mObservers) { 143 if (observer instanceof OnPrepareOptionsMenu) { 144 ((OnPrepareOptionsMenu) observer).onPrepareOptionsMenu(menu); 145 } 146 } 147 } 148 onOptionsItemSelected(final MenuItem menuItem)149 public boolean onOptionsItemSelected(final MenuItem menuItem) { 150 for (LifecycleObserver observer : mObservers) { 151 if (observer instanceof OnOptionsItemSelected) { 152 if (((OnOptionsItemSelected) observer).onOptionsItemSelected(menuItem)) { 153 return true; 154 } 155 } 156 } 157 return false; 158 } 159 } 160