android麦克风自录自放demo

extends：http://blog.csdn.net/trbbadboy/article/details/7865530

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"/>