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      1 /*
      2  * Copyright (C) 2011 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.example.android.musicplayer;
     18 
     19 import android.media.AudioManager;
     20 import android.util.Log;
     21 
     22 import java.lang.reflect.Method;
     23 
     24 /**
     25  * Contains methods to handle registering/unregistering remote control clients.  These methods only
     26  * run on ICS devices.  On previous devices, all methods are no-ops.
     27  */
     28 @SuppressWarnings({"unchecked", "rawtypes"})
     29 public class RemoteControlHelper {
     30     private static final String TAG = "RemoteControlHelper";
     31 
     32     private static boolean sHasRemoteControlAPIs = false;
     33 
     34     private static Method sRegisterRemoteControlClientMethod;
     35     private static Method sUnregisterRemoteControlClientMethod;
     36 
     37     static {
     38         try {
     39             ClassLoader classLoader = RemoteControlHelper.class.getClassLoader();
     40             Class sRemoteControlClientClass =
     41                     RemoteControlClientCompat.getActualRemoteControlClientClass(classLoader);
     42             sRegisterRemoteControlClientMethod = AudioManager.class.getMethod(
     43                     "registerRemoteControlClient", new Class[]{sRemoteControlClientClass});
     44             sUnregisterRemoteControlClientMethod = AudioManager.class.getMethod(
     45                     "unregisterRemoteControlClient", new Class[]{sRemoteControlClientClass});
     46             sHasRemoteControlAPIs = true;
     47         } catch (ClassNotFoundException e) {
     48             // Silently fail when running on an OS before ICS.
     49         } catch (NoSuchMethodException e) {
     50             // Silently fail when running on an OS before ICS.
     51         } catch (IllegalArgumentException e) {
     52             // Silently fail when running on an OS before ICS.
     53         } catch (SecurityException e) {
     54             // Silently fail when running on an OS before ICS.
     55         }
     56     }
     57 
     58     public static void registerRemoteControlClient(AudioManager audioManager,
     59             RemoteControlClientCompat remoteControlClient) {
     60         if (!sHasRemoteControlAPIs) {
     61             return;
     62         }
     63 
     64         try {
     65             sRegisterRemoteControlClientMethod.invoke(audioManager,
     66                     remoteControlClient.getActualRemoteControlClientObject());
     67         } catch (Exception e) {
     68             Log.e(TAG, e.getMessage(), e);
     69         }
     70     }
     71 
     72 
     73     public static void unregisterRemoteControlClient(AudioManager audioManager,
     74             RemoteControlClientCompat remoteControlClient) {
     75         if (!sHasRemoteControlAPIs) {
     76             return;
     77         }
     78 
     79         try {
     80             sUnregisterRemoteControlClientMethod.invoke(audioManager,
     81                     remoteControlClient.getActualRemoteControlClientObject());
     82         } catch (Exception e) {
     83             Log.e(TAG, e.getMessage(), e);
     84         }
     85     }
     86 }
     87 
     88