Android利用AudioRecord类实现音频录制程序

AudioRecord类相对于MediaRecorder来说，更加接近底层，为我们封装的方法也更少。然而实现一个AudioRecord的音频录制程序也很简单。本实例代码如下：

package demo.camera; 
import java.io.BufferedInputStream; 
import java.io.BufferedOutputStream; 
import java.io.DataInputStream; 
import java.io.DataOutputStream; 
import java.io.File; 
import java.io.FileInputStream; 
import java.io.FileOutputStream; 
import java.io.IOException; 
import android.app.Activity; 
import android.content.ContentValues; 
import android.content.Intent; 
import android.hardware.Camera.AutoFocusCallback; 
import android.media.AudioFormat; 
import android.media.AudioManager; 
import android.media.AudioRecord; 
import android.media.AudioTrack; 
import android.media.MediaPlayer; 
import android.media.MediaRecorder; 
import android.net.Uri; 
import android.os.AsyncTask; 
import android.os.Bundle; 
import android.os.Environment; 
import android.provider.MediaStore; 
import android.util.Log; 
import android.view.View; 
import android.widget.Button; 
import android.widget.TextView; 
 
public class MyAudioRecord2 extends Activity{ 
   
  private TextView stateView; 
   
  private Button btnStart,btnStop,btnPlay,btnFinish; 
   
  private RecordTask recorder; 
  private PlayTask player; 
   
  private File audioFile; 
   
  private boolean isRecording=true, isPlaying=false; //标记 
   
  private int frequence = 8000; //录制频率，单位hz.这里的值注意了，写的不好，可能实例化AudioRecord对象的时候，会出错。我开始写成11025就不行。这取决于硬件设备 
  private int channelConfig = AudioFormat.CHANNEL_CONFIGURATION_MONO; 
  private int audioEncoding = AudioFormat.ENCODING_PCM_16BIT; 
   
   
  public void onCreate(Bundle savedInstanceState){ 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.my_audio_record); 
     
    stateView = (TextView)this.findViewById(R.id.view_state); 
    stateView.setText("准备开始"); 
    btnStart = (Button)this.findViewById(R.id.btn_start); 
    btnStop = (Button)this.findViewById(R.id.btn_stop); 
    btnPlay = (Button)this.findViewById(R.id.btn_play); 
    btnFinish = (Button)this.findViewById(R.id.btn_finish); 
    btnFinish.setText("停止播放"); 
    btnStop.setEnabled(false); 
    btnPlay.setEnabled(false); 
    btnFinish.setEnabled(false); 
     
    //在这里我们创建一个文件，用于保存录制内容 
    File fpath = new File(Environment.getExternalStorageDirectory().getAbsolutePath()+"/data/files/"); 
    fpath.mkdirs();//创建文件夹 
    try { 
      //创建临时文件,注意这里的格式为.pcm 
      audioFile = File.createTempFile("recording", ".pcm", fpath); 
    } catch (IOException e) { 
      // TODO Auto-generated catch block 
      e.printStackTrace(); 
    }     
  } 
   
   
  public void onClick(View v){ 
    int id = v.getId(); 
    switch(id){ 
    case R.id.btn_start: 
      //开始录制 

      //这里启动录制任务 
      recorder = new RecordTask(); 
      recorder.execute(); 

      break; 
    case R.id.btn_stop: 
      //停止录制 
      this.isRecording = false; 
      //更新状态 
      //在录制完成时设置，在RecordTask的onPostExecute中完成 
      break; 
    case R.id.btn_play: 

      player = new PlayTask(); 
      player.execute(); 
      break; 
    case R.id.btn_finish: 
      //完成播放 
      this.isPlaying = false; 
      break; 

    } 
  } 
   
  class RecordTask extends AsyncTask{ 
    @Override 
    protected Void doInBackground(Void... arg0) { 
      isRecording = true; 
      try { 
 //开通输出流到指定的文件 
 DataOutputStream dos = new DataOutputStream(new BufferedOutputStream(new FileOutputStream(audioFile))); 
 //根据定义好的几个配置，来获取合适的缓冲大小 
 int bufferSize = AudioRecord.getMinBufferSize(frequence, channelConfig, audioEncoding); 
 //实例化AudioRecord 
 AudioRecord record = new AudioRecord(MediaRecorder.AudioSource.MIC, frequence, channelConfig, audioEncoding, bufferSize); 
 //定义缓冲 
 short[] buffer = new short[bufferSize]; 
  
 //开始录制 
 record.startRecording(); 
  
 int r = 0; //存储录制进度 
 //定义循环，根据isRecording的值来判断是否继续录制 
 while(isRecording){ 
   //从bufferSize中读取字节，返回读取的short个数 
   //这里老是出现buffer overflow，不知道是什么原因，试了好几个值，都没用，TODO：待解决 
   int bufferReadResult = record.read(buffer, 0, buffer.length); 
   //循环将buffer中的音频数据写入到OutputStream中 
   for(int i=0; i{ 
    @Override 
    protected Void doInBackground(Void... arg0) { 
      isPlaying = true; 
      int bufferSize = AudioTrack.getMinBufferSize(frequence, channelConfig, audioEncoding); 
      short[] buffer = new short[bufferSize/4]; 
      try { 
 //定义输入流，将音频写入到AudioTrack类中，实现播放 
 DataInputStream dis = new DataInputStream(new BufferedInputStream(new FileInputStream(audioFile))); 
 //实例AudioTrack 
 AudioTrack track = new AudioTrack(AudioManager.STREAM_MUSIC, frequence, channelConfig, audioEncoding, bufferSize, AudioTrack.MODE_STREAM); 
 //开始播放 
 track.play(); 
 //由于AudioTrack播放的是流，所以，我们需要一边播放一边读取 
 while(isPlaying && dis.available()>0){ 
   int i = 0; 
   while(dis.available()>0 && i

可惜，本实例测试时有个问题，在录制的时候，会出现buffer over。缓存泄露，待解决。
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