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"/>
原文：http://www.cnblogs.com/niray/p/4251409.html