实现控制第三方音乐播放器思路：
1.参考方法：可能实现第三方音乐播放器暂停/播放/下一曲/上一曲
思路：android模拟发送键值，就像蓝牙耳机等远程设备切换歌曲操作，但是行不通。原因是现在Android系统中，InputManager中的injectInputEvent方法有/*@hide/标记，个人建议做产品，为了安全起见，还是不要费大力气用这个方法了。
这是以前见到过的做法：
import android.hardware.input.InputManager; /*** 通过模拟KeyEvent触控事件来控制媒体音乐的播放*/private long mKeyRemappingSendFakeKeyDownTime; private void keyRemappingSendFakeKeyEvent(int action, int keyCode) { long eventTime = SystemClock.uptimeMillis(); if (action == KeyEvent.ACTION_DOWN) { mKeyRemappingSendFakeKeyDownTime = eventTime; } KeyEvent keyEvent = new KeyEvent(mKeyRemappingSendFakeKeyDownTime, eventTime, action, keyCode, 0); InputManager inputManager = (InputManager) mContext.getSystemService(Context.INPUT_SERVICE); inputManager.injectInputEvent(keyEvent, InputManager.INJECT_INPUT_EVENT_MODE_ASYNC); }
2.验证过方法：能够实现第三方音乐播放器暂停/播放功能
思路：写一个服务，当第三方播放器打开时 ，开启这个服务，音乐暂停；关闭服务，音乐继续
// 实现原理：打开服务，第三方音乐暂停；关闭服务，第三音乐继续播放// 关闭音乐播放服务stopService(new Intent(MainActivity.this,MusicService.class));// 开启音乐播放服务startService(new Intent(MainActivity.this,MusicService.class));
音乐服务工具类：
public class MusicService extends Service {private final String TAG = "MusicService";/*** 音频管理类*/private AudioManager mAudioManager;/*** 是否播放音乐*/private static boolean vIsActive=false;/*** 音乐监听器*/private MyOnAudioFocusChangeListener mListener;public int onStartCommand(Intent intent, int flags, int startId) {Log.d(TAG, "onStartCommand");// 获取系统音乐服务mAudioManager = (AudioManager) getApplicationContext().getSystemService(Context.AUDIO_SERVICE);// 获取系统音乐服务状态vIsActive=mAudioManager.isMusicActive();mListener = new MyOnAudioFocusChangeListener();if(vIsActive) {//播放状态int result = mAudioManager.requestAudioFocus(mListener,AudioManager.STREAM_MUSIC,AudioManager.AUDIOFOCUS_GAIN_TRANSIENT);if (result == AudioManager.AUDIOFOCUS_REQUEST_GRANTED){Log.d(TAG, "requestAudioFocus successfully.");}else{Log.d(TAG, "requestAudioFocus failed.");}}return super.onStartCommand(intent, flags, startId);}@Nullable@Overridepublic IBinder onBind(Intent intent) {return null;}@Overridepublic void onDestroy() {// TODO Auto-generated method stubsuper.onDestroy();if(vIsActive){mAudioManager.abandonAudioFocus(mListener);}Log.d(TAG, "onDestroy");}/*** 内部类：音乐监听器*/public class MyOnAudioFocusChangeListener implements AudioManager.OnAudioFocusChangeListener {@Overridepublic void onAudioFocusChange(int focusChange) {// TODO Auto-generated method stub}}}
