AudioRecord和AudioTrack是Android平台上录制和播放PCM音频数据两个重要类，与MediaRecorder和MediaPlayer类不同，

后者是在前者的基础上新增了部分编解码库，例如：amr、3GP等，如果想对Android的音频进行操纵掌握这两个类的使用至关重要；

具体使用方法可参考以下代码

注：在同一个机器上边录边播可能会有啸叫，所以本程序是先将录制的声音放在一个buffer中，录完后再播

添加权限

audio_act.xml

IAudioRecCallback

package com.example.audio;/** * @project SampleAndroid.workspace    * @class IAudioRecCallback  * @description        * @author yxmsw2007 * @version    * @email yxmsw2007@gmail.com   * @data 2015-7-9 下午10:41:55     */public interface IAudioRecCallback {	public void read(byte[] data);	}

AudioAct

package com.example.audio;import java.util.LinkedList;import com.example.app.R;import android.app.Activity;import android.os.Bundle;import android.util.Log;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.TextView;/** * @project SampleAndroid.workspace    * @class AudioAct  * @description        * @author yxmsw2007 * @version    * @email yxmsw2007@gmail.com   * @data 2015-7-7 下午11:48:21     */public class AudioAct extends Activity implements IAudioRecCallback, OnClickListener {	private static final String TAG = AudioAct.class.getSimpleName();	private LinkedList
    
      mAudioBuffer = new LinkedList
     
      ();		private AudioPlay mAudioPlay = new AudioPlay();		private AudioRec mAudioRec = new AudioRec(this);		private Button audio_act_record;	private Button audio_act_play;	private Button audio_act_read_buffer;	private TextView audio_act_info;		@Override	protected void onCreate(Bundle savedInstanceState) {		super.onCreate(savedInstanceState);		setContentView(R.layout.audio_act);		audio_act_record = (Button) findViewById(R.id.audio_act_record);		audio_act_play = (Button) findViewById(R.id.audio_act_play);		audio_act_read_buffer = (Button) findViewById(R.id.audio_act_read_buffer);		audio_act_info = (TextView) findViewById(R.id.audio_act_info);				audio_act_record.setOnClickListener(this);		audio_act_play.setOnClickListener(this);		audio_act_read_buffer.setOnClickListener(this);			}	@Override	public void read(byte[] data) {		Log.d(TAG, "" + data.length);		mAudioBuffer.add(data);	}		@Override	public void onClick(View v) {		switch (v.getId()) {		case R.id.audio_act_record:			if (mAudioRec.isRecording()) {				mAudioRec.stopRecord();			} else {				mAudioRec.startRecord();			}			break;		case R.id.audio_act_play:			if (mAudioPlay.isPlaying()) {				mAudioPlay.stopPlay();			} else {				mAudioPlay.startPlay();			}			break;		case R.id.audio_act_read_buffer:			if (!mAudioPlay.isPlaying()) {				mAudioPlay.startPlay();			}			readBuffer();			break;		default:			break;		}		updateView();	}		private void updateView() {		audio_act_record.setText(mAudioRec.isRecording() ? "Record(On)" : "Record(Off)");		audio_act_play.setText(mAudioPlay.isPlaying() ? "Play(On)" : "Play(Off)");	}		public void readBuffer() {		for (int i = 0; i < mAudioBuffer.size(); i++) {			mAudioPlay.playAudio(mAudioBuffer.remove(0));		}	}	}
     
    

AudioPlay

package com.example.audio;import android.media.AudioFormat;import android.media.AudioManager;import android.media.AudioRecord;import android.media.AudioTrack;import java.util.LinkedList;/** * @project SampleAndroid.workspace    * @class AudioPlay  * @description        * @author yxmsw2007 * @version    * @email yxmsw2007@gmail.com   * @data 2015-7-6 下午10:04:49     */public class AudioPlay {		public final static int PCM16_FRAME_SIZE = 320;	public final static int DELAY_FRAMES = 50 * 10;	//	public final static int STREAM_TYPE = AudioManager.STREAM_MUSIC;	public final static int STREAM_TYPE = AudioManager.STREAM_VOICE_CALL;	public final static int SAMPLE_RATE_IN_HZ = 8000;	public final static int CHANNEL_CONFIG = AudioFormat.CHANNEL_OUT_MONO;	public final static int AUDIO_FORMAT = AudioFormat.ENCODING_PCM_16BIT;		private static final String TAG = AudioPlay.class.getSimpleName();	private LinkedList
    
      mAudioBuffer = new LinkedList
     
      ();	private boolean mIsRunning;	public AudioPlay() {		mIsRunning = false;	}	private class PlayThread extends Thread {				public PlayThread() {			super("PlayThread");		}				public void run() {			android.os.Process.setThreadPriority(android.os.Process.THREAD_PRIORITY_URGENT_AUDIO);			int minBufferSize = android.media.AudioTrack.getMinBufferSize(SAMPLE_RATE_IN_HZ, CHANNEL_CONFIG, AUDIO_FORMAT);			AudioTrack audioTrack = null;			// 有极小的概率会初始化失败			while (mIsRunning					&& (audioTrack == null 					|| (audioTrack.getState() != AudioRecord.STATE_INITIALIZED))) {				if (audioTrack != null) {					audioTrack.release();				}				audioTrack = new AudioTrack(STREAM_TYPE,						SAMPLE_RATE_IN_HZ, CHANNEL_CONFIG, AUDIO_FORMAT, minBufferSize, AudioTrack.MODE_STREAM);				yield();			}			audioTrack.setStereoVolume(AudioTrack.getMaxVolume(), AudioTrack.getMaxVolume());			audioTrack.play();			while (mIsRunning) {				synchronized (mAudioBuffer) {					if (!mAudioBuffer.isEmpty()) {						byte[] data = mAudioBuffer.remove(0);						audioTrack.write(data, 0, data.length);					}				}			}			audioTrack.stop();			audioTrack.release();		}	};	public void startPlay() {		if (mIsRunning) {			return;		}		mIsRunning = true;		synchronized (mAudioBuffer) {			mAudioBuffer.clear();		}		PlayThread playThread = new PlayThread();		playThread.start();	}	// 停止播放	public void stopPlay() {		mIsRunning = false;	}	public void playAudio(byte[] data) {		if (!mIsRunning) {			return;		}		mAudioBuffer.add(data);	}		public boolean isPlaying() {		return mIsRunning;	}	}
     
    

AudioRec <br>

package com.example.audio;import android.media.AudioFormat;import android.media.AudioManager;import android.media.AudioRecord;import android.media.MediaRecorder;import android.util.Log;import java.util.LinkedList;/** * @project SampleAndroid.workspace    * @class AudioRec  * @description        * @author yxmsw2007 * @version    * @email yxmsw2007@gmail.com   * @data 2015-7-6 下午11:10:13     */public class AudioRec {		private static final String TAG = AudioRec.class.getSimpleName();		private final static int PCM16_FRAME_SIZE = 320;	public final static int STREAM_TYPE = MediaRecorder.AudioSource.MIC;	public final static int SAMPLE_RATE_IN_HZ = 8000;	public final static int CHANNEL_CONFIG = AudioFormat.CHANNEL_IN_MONO;	public final static int AUDIO_FORMAT = AudioFormat.ENCODING_PCM_16BIT;		private boolean mIsRunning;	private boolean mIsMute;		private IAudioRecCallback mCallback;		public AudioRec(IAudioRecCallback callback) {		this.mCallback = callback;	}		public AudioRec() {		super();		mIsRunning = false;		mIsMute = false;	}	private class RecordThread extends Thread {		public RecordThread() {			super("RecordThread");		}		public void run() {			android.os.Process.setThreadPriority(android.os.Process.THREAD_PRIORITY_URGENT_AUDIO);			int minBufferSize = android.media.AudioRecord.getMinBufferSize(					SAMPLE_RATE_IN_HZ, CHANNEL_CONFIG, AUDIO_FORMAT);			AudioRecord audioRecord = null;			// 当手机有程序正在使用麦克风时，会初始化失败			while (mIsRunning					&& (audioRecord == null 					|| (audioRecord.getState() != AudioRecord.STATE_INITIALIZED))) {				if (audioRecord != null) {					audioRecord.release();				}				audioRecord = new AudioRecord(						STREAM_TYPE, SAMPLE_RATE_IN_HZ,						CHANNEL_CONFIG, AUDIO_FORMAT, minBufferSize);				yield();			}			audioRecord.startRecording();			byte[] buffer = new byte[minBufferSize];			while (mIsRunning) {				int len = audioRecord.read(buffer, 0, buffer.length);				if (len > 0 && !mIsMute) {					byte[] data = new byte[len];					System.arraycopy(buffer, 0, data, 0, len);					mCallback.read(data);				}			}			if (audioRecord.getState() == AudioRecord.STATE_INITIALIZED) {				audioRecord.stop();				audioRecord.release();			}					}	};	public void startRecord() {		if (mIsRunning) {			return;		}		mIsRunning = true;		RecordThread recordThread = new RecordThread();		recordThread.start();	}	// 停止录音	public void stopRecord() {		mIsRunning = false;		mIsMute = false;	}	public boolean ismIsMute() {		return mIsMute;	}	public void setmIsMute(boolean mIsMute) {		this.mIsMute = mIsMute;	}	public boolean isRecording() {		return mIsRunning;	}	}

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参考资料