Android - 通过耳机播放音频

Question

我目前有代码使用AudioRecord类从设备mic读取录音,然后使用AudioTrack类播放.

我的问题是,当我播放它时,它通过扬声器电话播放.

我希望它通过设备上的耳机播出.

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);
      Log.d("SPEAKERPHONE", "Is speakerphone on? : " + am.isSpeakerphoneOn());
      am.setSpeakerphoneOn(false);
      Log.d("SPEAKERPHONE", "Is speakerphone on? : " + am.isSpeakerphoneOn());
      atrack.setPlaybackRate(11025);

      byte[] buffer = new byte[buffersize];
      arec.startRecording();
      atrack.play();

      while(isRecording) {
                         arec.read(buffer, 0, buffersize);
                         atrack.write(buffer, 0, buffer.length);
                         }
      arec.stop();
      atrack.stop();
      isRecording = false;
      }
   } 
}

正如您所看到的,我尝试使用AudioManager类及其方法(包括不推荐使用的setRouting方法)并且无效的代码,setSpeakerphoneOn方法似乎完全没有效果,路由方法也没有.

有没有人有任何关于如何通过耳机而不是spaker手机播放它的想法？

Answer 1

刚刚开始研究2.2.我仍然需要我不喜欢的In_Call设置,但我现在要处理它.我能够抛弃现在已弃用的呼叫路由功能.我发现你肯定需要这个Modify_Audio_Settings权限,没有它就没有错误,但是这个setSpeakerPhone方法什么也没做.这是我使用的代码的模拟.

private AudioManager m_amAudioManager;  
m_amAudioManager = (AudioManager)getSystemService(Context.AUDIO_SERVICE);  
m_amAudioManager.setMode(AudioManager.MODE_IN_CALL); 
m_amAudioManager.setSpeakerphoneOn(false); 

Answer 2

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);