| /* |
| * Copyright (C) 2015 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package com.android.mtp; |
| |
| import android.app.Notification; |
| import android.app.Service; |
| import android.app.NotificationManager; |
| import android.content.Context; |
| import android.content.Intent; |
| import android.os.IBinder; |
| import android.service.notification.StatusBarNotification; |
| import java.util.HashSet; |
| import java.util.Set; |
| |
| /** |
| * Service to manage lifetime of DocumentsProvider's process. |
| * The service prevents the system from killing the process that holds USB connections. The service |
| * starts to run when the first MTP device is opened, and stops when the last MTP device is closed. |
| */ |
| public class MtpDocumentsService extends Service { |
| static final String ACTION_UPDATE_NOTIFICATION = "com.android.mtp.UPDATE_NOTIFICATION"; |
| static final String EXTRA_DEVICE = "device"; |
| |
| private NotificationManager mNotificationManager; |
| |
| @Override |
| public IBinder onBind(Intent intent) { |
| // The service is used via intents. |
| return null; |
| } |
| |
| @Override |
| public void onCreate() { |
| super.onCreate(); |
| mNotificationManager = getSystemService(NotificationManager.class); |
| } |
| |
| @Override |
| public int onStartCommand(Intent intent, int flags, int startId) { |
| // If intent is null, the service was restarted. |
| if (intent == null || ACTION_UPDATE_NOTIFICATION.equals(intent.getAction())) { |
| return updateForegroundState() ? START_STICKY : START_NOT_STICKY; |
| } |
| return START_NOT_STICKY; |
| } |
| |
| /** |
| * Updates the foreground state of the service. |
| * @return Whether the service is foreground or not. |
| */ |
| private boolean updateForegroundState() { |
| final MtpDocumentsProvider provider = MtpDocumentsProvider.getInstance(); |
| final Set<Integer> openedNotification = new HashSet<>(); |
| boolean hasForegroundNotification = false; |
| |
| final StatusBarNotification[] activeNotifications = |
| mNotificationManager.getActiveNotifications(); |
| |
| for (final MtpDeviceRecord record : provider.getOpenedDeviceRecordsCache()) { |
| openedNotification.add(record.deviceId); |
| if (!hasForegroundNotification) { |
| // Mark this service as foreground with the notification so that the process is not |
| // killed by the system while a MTP device is opened. |
| startForeground(record.deviceId, createNotification(this, record)); |
| hasForegroundNotification = true; |
| } else { |
| // Only one notification can be shown as a foreground notification. We need to show |
| // the rest as normal notification. |
| mNotificationManager.notify(record.deviceId, createNotification(this, record)); |
| } |
| } |
| |
| for (final StatusBarNotification notification : activeNotifications) { |
| if (!openedNotification.contains(notification.getId())) { |
| mNotificationManager.cancel(notification.getId()); |
| } |
| } |
| |
| if (!hasForegroundNotification) { |
| // There is no opened device. |
| stopForeground(true /* removeNotification */); |
| stopSelf(); |
| return false; |
| } |
| |
| return true; |
| } |
| |
| public static Notification createNotification(Context context, MtpDeviceRecord device) { |
| final String title = context.getResources().getString( |
| R.string.accessing_notification_title, |
| device.name); |
| return new Notification.Builder(context) |
| .setLocalOnly(true) |
| .setContentTitle(title) |
| .setSmallIcon(com.android.internal.R.drawable.stat_sys_data_usb) |
| .setCategory(Notification.CATEGORY_SYSTEM) |
| .setPriority(Notification.PRIORITY_LOW) |
| .setFlag(Notification.FLAG_NO_CLEAR, true) |
| .build(); |
| } |
| } |