Android直接播放麦克风采集到的声音

这是一个直接播放麦克风采集到的声音线程类：

   class RecordThread extends Thread{
     static final int frequency = 44100;
     static final int channelConfiguration = AudioFormat.CHANNEL_CONFIGURATION_MONO;
     static final int audioEncoding = AudioFormat.ENCODING_PCM_16BIT;
 @Override
 public void run() {
     // TODO Auto-generated method stub
     int recBufSize = AudioRecord.getMinBufferSize(frequency,
             channelConfiguration, audioEncoding)*2;
     int plyBufSize = AudioTrack.getMinBufferSize(frequency,
             channelConfiguration, audioEncoding)*2;

     AudioRecord audioRecord = new AudioRecord(MediaRecorder.AudioSource.MIC, frequency,
             channelConfiguration, audioEncoding, recBufSize);

     AudioTrack audioTrack = new AudioTrack(AudioManager.STREAM_MUSIC, frequency,
             channelConfiguration, audioEncoding, plyBufSize, AudioTrack.MODE_STREAM);

     byte[] recBuf = new byte[recBufSize];
     audioRecord.startRecording();
     audioTrack.play();
     while(true){
         int readLen = audioRecord.read(recBuf, 0, recBufSize);
         audioTrack.write(recBuf, 0, readLen);
     }
     audioTrack.stop();
     audioRecord.stop();
 }
   }

使用的时候，这样就行：

 RecordThread rec = new RecordThread();
 rec.start();

需要在AndroidManifest.xml文件中添加路由权限：

 <uses-permission android:name="android.permission.RECORD_AUDIO"/>