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      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
     44     public IBinder onBind(Intent intent) {
     45         // The service is used via intents.
     46         return null;
     47     }
     48 
     49     @Override
     50     public void onCreate() {
     51         super.onCreate();
     52         mNotificationManager = getSystemService(NotificationManager.class);
     53     }
     54 
     55     @Override
     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      */
     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 
     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