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 registerRemoteControlClient(AudioManager audioManager, RemoteControlClientCompat remoteControlClient)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 unregisterRemoteControlClient(AudioManager audioManager, RemoteControlClientCompat remoteControlClient)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