1 /* 2 * Copyright (C) 2015 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 17 package com.android.mtp; 18 19 import android.app.Notification; 20 import android.app.Service; 21 import android.app.NotificationManager; 22 import android.content.ComponentName; 23 import android.content.Context; 24 import android.content.Intent; 25 import android.os.IBinder; 26 import android.util.Log; 27 28 import java.io.IOException; 29 30 /** 31 * Service to manage lifetime of DocumentsProvider's process. 32 * The service prevents the system from killing the process that holds USB connections. The service 33 * starts to run when the first MTP device is opened, and stops when the last MTP device is closed. 34 */ 35 public class MtpDocumentsService extends Service { 36 static final String ACTION_OPEN_DEVICE = "com.android.mtp.OPEN_DEVICE"; 37 static final String ACTION_CLOSE_DEVICE = "com.android.mtp.CLOSE_DEVICE"; 38 static final String ACTION_UPDATE_NOTIFICATION = "com.android.mtp.UPDATE_NOTIFICATION"; 39 static final String EXTRA_DEVICE = "device"; 40 41 NotificationManager mNotificationManager; 42 43 @Override onBind(Intent intent)44 public IBinder onBind(Intent intent) { 45 // The service is used via intents. 46 return null; 47 } 48 49 @Override onCreate()50 public void onCreate() { 51 super.onCreate(); 52 mNotificationManager = getSystemService(NotificationManager.class); 53 } 54 55 @Override onStartCommand(Intent intent, int flags, int startId)56 public int onStartCommand(Intent intent, int flags, int startId) { 57 // If intent is null, the service was restarted. 58 if (intent == null || ACTION_UPDATE_NOTIFICATION.equals(intent.getAction())) { 59 return updateForegroundState() ? START_STICKY : START_NOT_STICKY; 60 } 61 return START_NOT_STICKY; 62 } 63 64 /** 65 * Updates the foreground state of the service. 66 * @return Whether the service is foreground or not. 67 */ updateForegroundState()68 private boolean updateForegroundState() { 69 final MtpDocumentsProvider provider = MtpDocumentsProvider.getInstance(); 70 int notificationId = 0; 71 Notification notification = null; 72 // TODO: Hide notification if the device has already been removed. 73 for (final MtpDeviceRecord record : provider.getOpenedDeviceRecordsCache()) { 74 final String title = getResources().getString( 75 R.string.accessing_notification_title, 76 record.name); 77 notificationId = record.deviceId; 78 notification = new Notification.Builder(this) 79 .setLocalOnly(true) 80 .setContentTitle(title) 81 .setSmallIcon(com.android.internal.R.drawable.stat_sys_data_usb) 82 .setCategory(Notification.CATEGORY_SYSTEM) 83 .setPriority(Notification.PRIORITY_LOW) 84 .build(); 85 mNotificationManager.notify(record.deviceId, notification); 86 } 87 88 if (notification != null) { 89 startForeground(notificationId, notification); 90 return true; 91 } else { 92 stopForeground(true /* removeNotification */); 93 stopSelf(); 94 return false; 95 } 96 } 97 logErrorMessage(Exception exp)98 private static void logErrorMessage(Exception exp) { 99 if (exp.getMessage() != null) { 100 Log.e(MtpDocumentsProvider.TAG, exp.getMessage()); 101 } else { 102 Log.e(MtpDocumentsProvider.TAG, exp.toString()); 103 } 104 } 105 } 106