我目前有一些代碼，該代碼使用AudioRecord類從設備麥克風中讀取錄音，然后使用AudioTrack類將其回放。我的問題是，當我播放時，它是通過揚聲器播放的。我希望它通過設備上的聽筒播放。這是我的代碼：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);      }   } }如您所見，如果我嘗試使用AudioManager類及其方法（包括不贊成使用的setRouting方法）嘗試的代碼沒有任何效果，則setSpeakerphoneOn方法似乎完全無效，路由方法也無效。有沒有人知道如何通過聽筒而不是Spaker電話播放它？