android mediaRecorder详细讲解及使用

 public class mediarecorder1 extends ListActivity   {      private Button mAudioStartBtn;      private Button mAudioStopBtn;       private File mRecAudioFile;        // 录制的音频文件       private File mRecAudioPath;        // 录制的音频文件路徑       private MediaRecorder mMediaRecorder;// MediaRecorder对象       private List<String> mMusicList = new ArrayList<String>();// 录音文件列表       private String strTempFile = "recaudio_";// 零时文件的前缀        @Override      protected void onCreate(Bundle savedInstanceState)      {          // TODO Auto-generated method stub          super.onCreate(savedInstanceState);          setContentView(R.layout.mymultimedia_mediarecorder1);            mAudioStartBtn = (Button) findViewById(R.id.mediarecorder1_AudioStartBtn);          mAudioStopBtn = (Button) findViewById(R.id.mediarecorder1_AudioStopBtn);                    /*按钮状态*/          mAudioStartBtn.setEnabled(true);          mAudioStopBtn.setEnabled(false);                    /* 检测是否存在SD卡 */          if (Environment.getExternalStorageState().equals(android.os.Environment.MEDIA_MOUNTED))          {              mRecAudioPath = Environment.getExternalStorageDirectory();// 得到SD卡得路径              musicList();// 更新所有录音文件到List中          } else          {              Toast.makeText(mediarecorder1.this, "没有SD卡", Toast.LENGTH_LONG).show();          }                    /* 开始按钮事件监听 */          mAudioStartBtn.setOnClickListener(new Button.OnClickListener()              {             @Override              public void onClick(View arg0)              {                  try                  {                                          /* ①Initial：实例化MediaRecorder对象 */                      mMediaRecorder = new MediaRecorder();                      /* 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.DEFAULT);                      /* ②设置音频文件的编码：AAC/AMR_NB/AMR_MB/Default */                      mMediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.DEFAULT);                     /* ②设置输出文件的路径 */                                          try                      {                          mRecAudioFile = File.createTempFile(strTempFile, ".amr", mRecAudioPath);                                                } catch (Exception e)                      {                          e.printStackTrace();                       }                      mMediaRecorder.setOutputFile(mRecAudioFile.getAbsolutePath());                      /* ③准备 */                      mMediaRecorder.prepare();                      /* ④开始 */                      mMediaRecorder.start();                      /*按钮状态*/                      mAudioStartBtn.setEnabled(false);                      mAudioStopBtn.setEnabled(true);                  } catch (IOException e)                  {                     e.printStackTrace();                  }              }          });          /* 停止按钮事件监听 */          mAudioStopBtn.setOnClickListener(new Button.OnClickListener()          {              @Override              public void onClick(View arg0)              {                  // TODO Auto-generated method stub                  if (mRecAudioFile != null)                  {                      /* ⑤停止录音 */                      mMediaRecorder.stop();                      /* 将录音文件添加到List中 */                      mMusicList.add(mRecAudioFile.getName());                      ArrayAdapter<String> musicList = new ArrayAdapter<String>(mediarecorder1.this,                              R.layout.list, mMusicList);                      setListAdapter(musicList);                      /* ⑥释放MediaRecorder */                      mMediaRecorder.release();                      mMediaRecorder = null;                      /* 按钮状态 */                      mAudioStartBtn.setEnabled(true);                      mAudioStopBtn.setEnabled(false);                  }              }         });     }      /* 播放录音文件 */     private void playMusic(File file)     {         Intent intent = new Intent();         intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);         intent.setAction(android.content.Intent.ACTION_VIEW);         /* 设置文件类型 */         intent.setDataAndType(Uri.fromFile(file), "audio");         startActivity(intent);     }      @Override     /* 当我们点击列表时，播放被点击的音乐 */     protected void onListItemClick(ListView l, View v, int position, long id)     {         /* 得到被点击的文件 */         File playfile = new File(mRecAudioPath.getAbsolutePath() + File.separator                 + mMusicList.get(position));         /* 播放 */         playMusic(playfile);     }      /* 播放列表 */     public void musicList()     {         // 取得指定位置的文件设置显示到播放列表         File home = mRecAudioPath;         if (home.listFiles(new MusicFilter()).length > 0)         {             for (File file : home.listFiles(new MusicFilter()))             {                 mMusicList.add(file.getName());             }             ArrayAdapter<String> musicList = new ArrayAdapter<String>(mediarecorder1.this,                     R.layout.list, mMusicList);             setListAdapter(musicList);         }     } }  /* 过滤文件类型 */ class MusicFilter implements FilenameFilter {     public boolean accept(File dir, String name)     {         return (name.endsWith(".amr"));     } }
 //布局文件
<?xml version="1.0" encoding="utf-8"?>
<AbsoluteLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >    
     
    <ListView
android:id="@id/android:list"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:layout_weight="1"
        android:drawSelectorOnTop="false" />

    <Button
android:id="@+id/mediarecorder1_AudioStartBtn"
        android:layout_width="170px"
        android:layout_height="wrap_content"
        android:layout_x="30px"
        android:layout_y="100px"
        android:text="开始录制音频" />

    <Button
android:id="@+id/mediarecorder1_AudioStopBtn"
        android:layout_width="170px"
        android:layout_height="wrap_content"
        android:layout_x="210px"
        android:layout_y="100px"
        android:text="停止音频录制" /> 
    
</AbsoluteLayout>