NotificationListenerService.java revision c4aee98a62f400dd9f6f964d26d739d409212775
1/* 2 * Copyright (C) 2013 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 17package android.service.notification; 18 19import android.annotation.SdkConstant; 20import android.app.INotificationManager; 21import android.app.Service; 22import android.content.Context; 23import android.content.Intent; 24import android.os.IBinder; 25import android.os.ServiceManager; 26import android.util.Log; 27 28/** 29 * A service that receives calls from the system when new notifications are posted or removed. 30 * <p>To extend this class, you must declare the service in your manifest file with 31 * the {@link android.Manifest.permission#BIND_NOTIFICATION_LISTENER_SERVICE} permission 32 * and include an intent filter with the {@link #SERVICE_INTERFACE} action. For example:</p> 33 * <pre> 34 * <service android:name=".NotificationListener" 35 * android:label="@string/service_name" 36 * android:permission="android.permission.BIND_NOTIFICATION_LISTENER_SERVICE"> 37 * <intent-filter> 38 * <action android:name="android.service.notification.NotificationListenerService" /> 39 * </intent-filter> 40 * </service></pre> 41 */ 42public abstract class NotificationListenerService extends Service { 43 // TAG = "NotificationListenerService[MySubclass]" 44 private final String TAG = NotificationListenerService.class.getSimpleName() 45 + "[" + getClass().getSimpleName() + "]"; 46 47 private INotificationListenerWrapper mWrapper = null; 48 49 private INotificationManager mNoMan; 50 51 /** 52 * The {@link Intent} that must be declared as handled by the service. 53 */ 54 @SdkConstant(SdkConstant.SdkConstantType.SERVICE_ACTION) 55 public static final String SERVICE_INTERFACE 56 = "android.service.notification.NotificationListenerService"; 57 58 /** 59 * Implement this method to learn about new notifications as they are posted by apps. 60 * 61 * @param sbn A data structure encapsulating the original {@link android.app.Notification} 62 * object as well as its identifying information (tag and id) and source 63 * (package name). 64 */ 65 public abstract void onNotificationPosted(StatusBarNotification sbn); 66 67 /** 68 * Implement this method to learn when notifications are removed. 69 * <P> 70 * This might occur because the user has dismissed the notification using system UI (or another 71 * notification listener) or because the app has withdrawn the notification. 72 * <P> 73 * NOTE: The {@link StatusBarNotification} object you receive will be "light"; that is, the 74 * result from {@link StatusBarNotification#getNotification} may be missing some heavyweight 75 * fields such as {@link android.app.Notification#contentView} and 76 * {@link android.app.Notification#largeIcon}. However, all other fields on 77 * {@link StatusBarNotification}, sufficient to match this call with a prior call to 78 * {@link #onNotificationPosted(StatusBarNotification)}, will be intact. 79 * 80 * @param sbn A data structure encapsulating at least the original information (tag and id) 81 * and source (package name) used to post the {@link android.app.Notification} that 82 * was just removed. 83 */ 84 public abstract void onNotificationRemoved(StatusBarNotification sbn); 85 86 private final INotificationManager getNotificationInterface() { 87 if (mNoMan == null) { 88 mNoMan = INotificationManager.Stub.asInterface( 89 ServiceManager.getService(Context.NOTIFICATION_SERVICE)); 90 } 91 return mNoMan; 92 } 93 94 /** 95 * Inform the notification manager about dismissal of a single notification. 96 * <p> 97 * Use this if your listener has a user interface that allows the user to dismiss individual 98 * notifications, similar to the behavior of Android's status bar and notification panel. 99 * It should be called after the user dismisses a single notification using your UI; 100 * upon being informed, the notification manager will actually remove the notification 101 * and you will get an {@link #onNotificationRemoved(StatusBarNotification)} callback. 102 * <P> 103 * <b>Note:</b> If your listener allows the user to fire a notification's 104 * {@link android.app.Notification#contentIntent} by tapping/clicking/etc., you should call 105 * this method at that time <i>if</i> the Notification in question has the 106 * {@link android.app.Notification#FLAG_AUTO_CANCEL} flag set. 107 * 108 * @param pkg Package of the notifying app. 109 * @param tag Tag of the notification as specified by the notifying app in 110 * {@link android.app.NotificationManager#notify(String, int, android.app.Notification)}. 111 * @param id ID of the notification as specified by the notifying app in 112 * {@link android.app.NotificationManager#notify(String, int, android.app.Notification)}. 113 */ 114 public final void cancelNotification(String pkg, String tag, int id) { 115 if (!isBound()) return; 116 try { 117 getNotificationInterface().cancelNotificationFromListener(mWrapper, pkg, tag, id); 118 } catch (android.os.RemoteException ex) { 119 Log.v(TAG, "Unable to contact notification manager", ex); 120 } 121 } 122 123 /** 124 * Inform the notification manager about dismissal of all notifications. 125 * <p> 126 * Use this if your listener has a user interface that allows the user to dismiss all 127 * notifications, similar to the behavior of Android's status bar and notification panel. 128 * It should be called after the user invokes the "dismiss all" function of your UI; 129 * upon being informed, the notification manager will actually remove all active notifications 130 * and you will get multiple {@link #onNotificationRemoved(StatusBarNotification)} callbacks. 131 * 132 * {@see #cancelNotification(String, String, int)} 133 */ 134 public final void cancelAllNotifications() { 135 if (!isBound()) return; 136 try { 137 getNotificationInterface().cancelAllNotificationsFromListener(mWrapper); 138 } catch (android.os.RemoteException ex) { 139 Log.v(TAG, "Unable to contact notification manager", ex); 140 } 141 } 142 143 /** 144 * Request the list of outstanding notifications (that is, those that are visible to the 145 * current user). Useful when starting up and you don't know what's already been posted. 146 * 147 * @return An array of active notifications. 148 */ 149 public StatusBarNotification[] getActiveNotifications() { 150 if (!isBound()) return null; 151 try { 152 return getNotificationInterface().getActiveNotificationsFromListener(mWrapper); 153 } catch (android.os.RemoteException ex) { 154 Log.v(TAG, "Unable to contact notification manager", ex); 155 } 156 return null; 157 } 158 159 @Override 160 public IBinder onBind(Intent intent) { 161 if (mWrapper == null) { 162 mWrapper = new INotificationListenerWrapper(); 163 } 164 return mWrapper; 165 } 166 167 private boolean isBound() { 168 if (mWrapper == null) { 169 Log.w(TAG, "Notification listener service not yet bound."); 170 return false; 171 } 172 return true; 173 } 174 175 private class INotificationListenerWrapper extends INotificationListener.Stub { 176 @Override 177 public void onNotificationPosted(StatusBarNotification sbn) { 178 try { 179 NotificationListenerService.this.onNotificationPosted(sbn); 180 } catch (Throwable t) { 181 Log.w(TAG, "Error running onNotificationPosted", t); 182 } 183 } 184 @Override 185 public void onNotificationRemoved(StatusBarNotification sbn) { 186 try { 187 NotificationListenerService.this.onNotificationRemoved(sbn); 188 } catch (Throwable t) { 189 Log.w(TAG, "Error running onNotificationRemoved", t); 190 } 191 } 192 } 193} 194