Android-通过听筒播放音频

Question

我目前有一些代码，该代码使用AudioRecord类从设备麦克风中读取录音，然后使用AudioTrack类将其回放。我的问题是，当我播放时，它是通过扬声器播放的。我希望它通过设备上的听筒播放。这是我的代码：public class LoopProg extends Activity { boolean isRecording; //currently not used AudioManager am; int count = 0; /** Called when the activity is first created. */ @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);        am = (AudioManager) getSystemService(Context.AUDIO_SERVICE);        am.setMicrophoneMute(true);        while(count <= 1000000){        Record record = new Record();          record.run();        count ++;        Log.d("COUNT", "Count is : " + count);        }    }    public class Record extends Thread{      static final int bufferSize = 200000;      final short[] buffer = new short[bufferSize];      short[] readBuffer = new short[bufferSize];      public void run() {        isRecording = true;      android.os.Process.setThreadPriority(android.os.Process.THREAD_PRIORITY_URGENT_AUDIO);      int buffersize = AudioRecord.getMinBufferSize(11025, AudioFormat.CHANNEL_CONFIGURATION_MONO, AudioFormat.ENCODING_PCM_16BIT);      AudioRecord arec = new AudioRecord(MediaRecorder.AudioSource.MIC, 11025, AudioFormat.CHANNEL_CONFIGURATION_MONO, AudioFormat.ENCODING_PCM_16BIT, buffersize);      AudioTrack atrack = new AudioTrack(AudioManager.STREAM_MUSIC, 11025, AudioFormat.CHANNEL_CONFIGURATION_MONO, AudioFormat.ENCODING_PCM_16BIT, buffersize, AudioTrack.MODE_STREAM);      am.setRouting(AudioManager.MODE_NORMAL,1, AudioManager.STREAM_MUSIC);      int ok = am.getRouting(AudioManager.ROUTE_EARPIECE);      Log.d("ROUTING", "getRouting = " + ok);      setVolumeControlStream(AudioManager.STREAM_VOICE_CALL);      //am.setSpeakerphoneOn(true);      }   } }如您所见，如果我尝试使用AudioManager类及其方法（包括不赞成使用的setRouting方法）尝试的代码没有任何效果，则setSpeakerphoneOn方法似乎完全无效，路由方法也无效。有没有人知道如何通过听筒而不是Spaker电话播放它？

Answer 1

请使用此代码，效果很好：

    //PLAY ON EARPIECE

    mPlayer.setAudioStreamType(AudioManager.STREAM_VOICE_CALL);

    audioManager.setMode(AudioManager.MODE_IN_CALL);

    audioManager.setSpeakerphoneOn(false);

    //PLAY ON SPEAKER

    mPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);

    audioManager.setMode(AudioManager.MODE_IN_CALL);

    audioManager.setSpeakerphoneOn(true);