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      1 /*
      2  * Copyright (C) 2017 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.googlecode.android_scripting;
     18 
     19 import android.app.Notification;
     20 import android.app.NotificationManager;
     21 import android.app.Service;
     22 
     23 import java.lang.reflect.Method;
     24 
     25 public abstract class ForegroundService extends Service {
     26   private static final Class<?>[] mStartForegroundSignature =
     27       new Class[] { int.class, Notification.class };
     28   private static final Class<?>[] mStopForegroundSignature = new Class[] { boolean.class };
     29 
     30   private final int mNotificationId;
     31 
     32   private NotificationManager mNotificationManager;
     33   private Method mStartForeground;
     34   private Method mStopForeground;
     35   private Object[] mStartForegroundArgs = new Object[2];
     36   private Object[] mStopForegroundArgs = new Object[1];
     37 
     38   public ForegroundService(int id) {
     39     mNotificationId = id;
     40   }
     41 
     42   protected abstract Notification createNotification();
     43 
     44   /**
     45    * @return The NotificationManager for this Context.
     46    */
     47   protected NotificationManager getNotificationManager() {
     48     if (mNotificationManager == null) {
     49       mNotificationManager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
     50     }
     51     return mNotificationManager;
     52   }
     53 
     54   /**
     55    * This is a wrapper around the new startForeground method, using the older APIs if it is not
     56    * available.
     57    */
     58   private void startForegroundCompat(Notification notification) {
     59     // If we have the new startForeground API, then use it.
     60     if (mStartForeground != null) {
     61       mStartForegroundArgs[0] = Integer.valueOf(mNotificationId);
     62       mStartForegroundArgs[1] = notification;
     63       try {
     64         mStartForeground.invoke(this, mStartForegroundArgs);
     65       } catch (Exception e) {
     66         Log.e(e);
     67       }
     68       return;
     69     }
     70 
     71     // Fall back on the old API.
     72     setForeground(true);
     73     if (notification != null) {
     74       getNotificationManager().notify(mNotificationId, notification);
     75     }
     76   }
     77 
     78   /**
     79    * This is a wrapper around the new stopForeground method, using the older APIs if it is not
     80    * available.
     81    */
     82   private void stopForegroundCompat() {
     83     // If we have the new stopForeground API, then use it.
     84     if (mStopForeground != null) {
     85       mStopForegroundArgs[0] = Boolean.TRUE;
     86       try {
     87         mStopForeground.invoke(this, mStopForegroundArgs);
     88       } catch (Exception e) {
     89         Log.e(e);
     90       }
     91       return;
     92     }
     93 
     94     // Fall back on the old API. Note to cancel BEFORE changing the
     95     // foreground state, since we could be killed at that point.
     96     getNotificationManager().cancel(mNotificationId);
     97     setForeground(false);
     98   }
     99 
    100   @Override
    101   public void onCreate() {
    102     try {
    103       mStartForeground = getClass().getMethod("startForeground", mStartForegroundSignature);
    104       mStopForeground = getClass().getMethod("stopForeground", mStopForegroundSignature);
    105     } catch (NoSuchMethodException e) {
    106       // Running on an older platform.
    107       mStartForeground = mStopForeground = null;
    108     }
    109     startForegroundCompat(createNotification());
    110   }
    111 
    112   @Override
    113   public void onDestroy() {
    114     // Make sure our notification is gone.
    115     stopForegroundCompat();
    116   }
    117 }
    118