实现类似微信中说话功能的录音处理代码实例

package com.example.testaudio;       import java.io.File;       import android.app.Activity;  import android.media.MediaPlayer;  import android.media.MediaPlayer.OnCompletionListener;  import android.media.MediaRecorder;  import android.os.Bundle;  import android.os.Environment;  import android.os.Handler;  import android.os.Message;  import android.util.Log;  import android.view.Menu;  import android.view.MotionEvent;  import android.view.View;  import android.view.View.OnClickListener;  import android.view.View.OnTouchListener;  import android.widget.Button;  import android.widget.TextView;       public class MainActivity extends Activity {               private MediaRecorder recoder = null;      private MediaPlayer player = null;      private String theMediaPath;               TextView tv = null;      TextView tvRecord = null;      Button testBtn = null;      Button testBtn2 = null;      Button stopBtn = null;      Button playBtn = null;               @Override      protected void onCreate(Bundle savedInstanceState) {          super.onCreate(savedInstanceState);          setContentView(R.layout.activity_main);          tv = (TextView)findViewById(R.id.textView1);          tvRecord = (TextView)findViewById(R.id.tvRecord);          testBtn = (Button)findViewById(R.id.button1);          testBtn2 = (Button)findViewById(R.id.button2);          stopBtn = (Button)findViewById(R.id.buttonStop);          playBtn = (Button)findViewById(R.id.buttonPlay);                       testBtn2.setOnTouchListener(new OnTouchListener() {              @Override              public boolean onTouch(View v, MotionEvent event) {                  Log.i("testactivity", "setOnTouchListener:"+event.getAction());                  switch(event.getAction()) {                      case MotionEvent.ACTION_UP: {                          Log.i("testactivity", "停止录音");                          stopRecording();                          break;                      }                      case MotionEvent.ACTION_DOWN: {                          Log.i("testactivity", "开始录音");                          startRecording();                          break;                      }                      default: break;                  }                  return false;              }          });                                    testBtn.setOnClickListener(new OnClickListener() {              public void onClick(View arg0) {                  startRecording();                  testBtn.setEnabled(false);                  stopBtn.setEnabled(true);              }          });                       stopBtn.setEnabled(false);                       stopBtn.setOnClickListener(new OnClickListener() {              public void onClick(View arg0) {                  stopRecording();                  testBtn.setEnabled(true);                  playBtn.setEnabled(true);                  stopBtn.setEnabled(false);              }          });                                    playBtn.setOnClickListener(new OnClickListener() {              public void onClick(View arg0) {                  playRecordFile(theMediaPath);                  stopBtn.setEnabled(true);              }          });      }           protected void playRecordFile(String _file) {          try {              File f = new File(_file);              if(!f.exists()) {                  tv.setText("文件不存在:" + _file);                  return;              }          } catch(Exception e) {              Log.i("testactivity", e.getMessage());          }          try {              player = new MediaPlayer();              player.setDataSource(_file);              player.prepare();              player.setOnCompletionListener(new OnCompletionListener() {                  public void onCompletion(MediaPlayer arg0) {                      tv.setText("播放完毕");                      stopBtn.setEnabled(false);                  }              });                               player.start();          } catch(Exception e) {              Log.e("testactivity", "play failed:" + e.getMessage());          }      }               /**       * 停止录音处理       */      protected void stopRecording() {                       if(recoder != null) {              Log.i("testactivity", "停止录音");              recoder.stop();              recoder.release();              recoder = null;              endtime = System.currentTimeMillis();              _handleRecordComplete();          }          if(player != null) {              Log.i("testactivity", "停止播放");              player.stop();              player.release();              player = null;          }      }                        /**       * 开始录音处理       */      protected void startRecording() {                       theMediaPath = Environment.getExternalStorageDirectory().getAbsolutePath();          theMediaPath += "/audiotest.3gp";                       recoder = new MediaRecorder();          recoder.setAudioSource(MediaRecorder.AudioSource.MIC);          recoder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);          recoder.setOutputFile(theMediaPath);          recoder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);                       starttime = System.currentTimeMillis();          updateMicStatus();                       try {              recoder.prepare();              recoder.start();              _handleRecordStart();          } catch (Exception e) {              Log.e("testactivity", "prepared failed:" + e.getMessage());              _handleRecordStartError(e);          }                   }               //定时器      private static long maxtime = 30*1000; //30秒      private long starttime = 0l;      private long endtime = 0l;      private final Handler mHandler = new Handler();       private Runnable mUpdateMicStatusTimer = new Runnable() {           public void run() {               //判断是否超时              if(starttime > 0 && System.currentTimeMillis() - starttime > maxtime) {                  Log.e("testactivity", "超时的录音时间，直接停止");                  stopRecording();                  return;              }                               //更新分贝状态              updateMicStatus();           }       };              /**       * 更新话筒状态 分贝是也就是相对响度 分贝的计算公式K=20lg(Vo/Vi) Vo当前振幅值 Vi基准值为600：我是怎么制定基准值的呢？ 当20       * * Math.log10(mMediaRecorder.getMaxAmplitude() / Vi)==0的时候vi就是我所需要的基准值       * 当我不对着麦克风说任何话的时候，测试获得的mMediaRecorder.getMaxAmplitude()值即为基准值。       * Log.i("mic_", "麦克风的基准值：" + mMediaRecorder.getMaxAmplitude());前提时不对麦克风说任何话       */      private int BASE = 600;       private int SPACE = 300;// 间隔取样时间               private void updateMicStatus() {           if (recoder != null) {               // int vuSize = 10 * mMediaRecorder.getMaxAmplitude() / 32768;               int ratio = recoder.getMaxAmplitude() / BASE;               int db = 0;// 分贝               if (ratio > 1)                   db = (int) (20 * Math.log10(ratio));                                                 _handleRecordVoice(db);                               mHandler.postDelayed(mUpdateMicStatusTimer, SPACE);               /*               * if (db > 1) { vuSize = (int) (20 * Math.log10(db)); Log.i("mic_",               * "麦克风的音量的大小：" + vuSize); } else Log.i("mic_", "麦克风的音量的大小：" + 0);               */          }       }                    private void _handleRecordStart() {          //开始录音的接收函数          tv.setText("开始录音...");          //starttime 开始时间      }               private void _handleRecordStartError(Exception e) {          //开始录音的接收函数失败          tv.setText("开始录音失败:" + e.getMessage());      }               private void _handleRecordComplete() {          //结束录音          tv.setText("停止录音:" + theMediaPath);      }               private void _handleRecordVoice(int _db) {          //声音事件侦听，转换成分贝          tvRecord.setText(""+_db);      }               @Override      public boolean onCreateOptionsMenu(Menu menu) {          // Inflate the menu; this adds items to the action bar if it is present.          getMenuInflater().inflate(R.menu.main, menu);          return true;      }       }

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