//本地app中的assets文件夹有music_1.mp3的文件，那么怎么获取文件引用，并直接播放这个文件呢     private void playMusic(boolean play) {         try {             if (mMediaPlayer == null) {                 mMediaPlayer = new MediaPlayer();                 AssetFileDescriptor mAssetFD = getAssets().openFd("music_1.mp3");//打开音乐文件                 mMediaPlayer.setDataSource(mAssetFD.getFileDescriptor(), mAssetFD.getStartOffset(), mAssetFD.getLength());//设置音源                 mMediaPlayer.setAudioStreamType(AudioManager.STREAM_VOICE_CALL);//输出类型为通话             }             if (play) {                 mMediaPlayer.prepare();                 mMediaPlayer.setLooping(true);//循环播放                 //mMediaPlayer.setVolume(maxVolume,maxVolume);                 mMediaPlayer.start();//开始播放             } else {                 mMediaPlayer.release();//停止播放             }

        } catch (Exception e) {             Log.d(TAG, "receiver mMediaPlayer Exception:");             e.printStackTrace();         }     }