android 实时麦克风变化

package com.coolsoft.app.oklight;import java.io.File;import java.io.IOException;import android.media.MediaRecorder;import android.os.Handler;import android.util.Log;import android.widget.ImageView;/** * amr音频处理 *  * @author hongfa.yy * @version 创建时间2012-11-21 下午4:33:28 */public class RecordManager { private final String TAG = "RecordManager"; private MediaRecorder mMediaRecorder; public static final int MAX_LENGTH = 1000 * 60 * 10;// 最大录音时长1000*60*10; private File file; public RecordManager(File file,ImageView view) {  this.file = file;  this.view=view; } public RecordManager(File file) {  this.file = file; } private long startTime; private long endTime; /**  * 开始录音 使用amr格式  *   * @param mRecAudioFile  *            录音文件  * @return  */ public void startRecord() {  // 开始录音  /* ①Initial：实例化MediaRecorder对象 */  if (mMediaRecorder == null)   mMediaRecorder = new MediaRecorder();  try {   /* ②setAudioSource/setVedioSource */   mMediaRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);// 设置麦克风   /*    * ②设置输出文件的格式：THREE_GPP/MPEG-4/RAW_AMR/Default THREE_GPP(3gp格式    * ，H263视频/ARM音频编码)、MPEG-4、RAW_AMR(只支持音频且音频编码要求为AMR_NB)    */   mMediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.AMR_NB);   /* ②设置音频文件的编码：AAC/AMR_NB/AMR_MB/Default 声音的（波形）的采样 */   mMediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.DEFAULT);   /* ③准备 */   mMediaRecorder.setOutputFile(file.getAbsolutePath());   mMediaRecorder.setMaxDuration(MAX_LENGTH);   mMediaRecorder.prepare();   /* ④开始 */   mMediaRecorder.start();   // AudioRecord audioRecord.   /* 获取开始时间* */   startTime = System.currentTimeMillis();   // pre=mMediaRecorder.getMaxAmplitude();   updateMicStatus();   Log.i("ACTION_START", "startTime" + startTime);  } catch (IllegalStateException e) {   Log.i(TAG,     "call startAmr(File mRecAudioFile) failed!"       + e.getMessage());  } catch (IOException e) {   Log.i(TAG,     "call startAmr(File mRecAudioFile) failed!"       + e.getMessage());  } } /**  * 停止录音  *   * @param mMediaRecorder  */ public long stopRecord() {  if (mMediaRecorder == null)   return 0L;  endTime = System.currentTimeMillis();  Log.i("ACTION_END", "endTime" + endTime);  mMediaRecorder.stop();  mMediaRecorder.reset();  mMediaRecorder.release();  mMediaRecorder = null;  Log.i("ACTION_LENGTH", "Time" + (endTime - startTime));  return endTime - startTime; } private final Handler mHandler = new Handler(); private Runnable mUpdateMicStatusTimer = new Runnable() {  public void run() {   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 = 200;// 间隔取样时间 private ImageView view; private void updateMicStatus() {  if (mMediaRecorder != null && view != null) {   // int vuSize = 10 * mMediaRecorder.getMaxAmplitude() / 32768;   int ratio = mMediaRecorder.getMaxAmplitude() / BASE;   int db = 0;// 分贝   if (ratio > 1)    db = (int) (20 * Math.log10(ratio));   System.out.println("分贝值："+db+"     "+Math.log10(ratio));   switch (db / 4) {   case 0:    view.setImageBitmap(null);    break;   case 1:    view.setImageResource(R.drawable.logo64);    break;   case 2:    view.setImageResource(R.drawable.logo96);    break;   case 3:    view.setImageResource(R.drawable.logo124);    break;   case 4:    view.setImageResource(R.drawable.logo135);    break;   case 5:    view.setImageResource(R.drawable.logo512);    break;   default:    view.setImageResource(R.drawable.ic_launcher);    break;   }   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);    */  } }}
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