java - Android-Android4.0中的MediaPlayer异常

我在Android应用程序中使用视频录制。它在Android2.2和Android2.3设备中正常工作，但应用程序在Android4.0中崩溃。

这是我的代码：

  class VideoPreview extends SurfaceView implements SurfaceHolder.Callback
  {
  MediaRecorder recorder;
  SurfaceHolder holder = null;
  FileOutputStream fileout;
 public VideoPreview(Context context,MediaRecorder temprecorder) {
 super(context);
    recorder= temprecorder;
    holder= getHolder();
    holder.addCallback(this);
    holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
   }
  public void surfaceCreated(SurfaceHolder holder){
    }
  public void surfaceDestroyed(SurfaceHolder holder)
  {
      if(recorder!=null)
      {
    recorder.release();
    Log.d("Video Preview", "Exception1");
    recorder = null;
      }
  }

  //surfaceChanged : This method is called after the surface is created.
  public void surfaceChanged(SurfaceHolder holder, int format, int w, int h)
  {
  }
  public void  stop(){

      if(recorder!=null)
      {
      recorder.release();
      recorder = null;
      }
  }
    @Override
    public boolean onKeyDown (int keyCode, KeyEvent event){

         return false;

    }

  public boolean start()  {
      String state = android.os.Environment.getExternalStorageState();
      String path = Environment.getExternalStorageDirectory().getAbsolutePath() +"/myvideo.mp4";
      File fname = new File(path);
      if (!state.equals(Environment.MEDIA_MOUNTED)) return false;
      File directory = new File(path).getParentFile();
      if(!directory.exists() && !directory.mkdirs())   return false;

          if (recorder == null)
            recorder = new MediaRecorder();

           int out_format = MediaRecorder.OutputFormat.MPEG_4;
           //THREE_GPP;
          recorder.setVideoSource(MediaRecorder.VideoSource.CAMERA);
          recorder.setAudioSource(MediaRecorder.AudioSource.MIC);
            recorder.setOutputFormat(out_format);
            recorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
            recorder.setVideoEncoder(MediaRecorder.VideoEncoder.MPEG_4_SP);
            //recorder.setMaxDuration(20000);
            //recorder.setVideoSize(352,288);   // 352, 288 m_recorder.setVideoSize(320, 240); 176,144
            recorder.setVideoFrameRate(15);
            recorder.setOutputFile(fname.getPath());
           /* videoview = (VideoView) findViewById(R.id.videosurface);
            SurfaceHolder holder = videoview.getHolder();
            mediarecorder.setPreviewDisplay(holder.getSurface());*/
            recorder.setPreviewDisplay(holder.getSurface());
            try {
                Thread.sleep(6000);
            } catch (InterruptedException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
            if (!Recorder_Prepare())
            return false;
            else
            return true;
      }

private boolean Recorder_Prepare()
    {

        try {
            if (recorder != null){
            recorder.prepare();
            Log.d("Video Preview", "Exception2");
            recorder.start();
            Log.d("Video Preview", "Exception3");
            }
        }
            catch (IllegalStateException e) {
                return false;
            }
            catch (IOException e) {
                return false;
            }
            return true;
    }
  }

这是我的logcat在recorder.start();处引发异常，如下所示：

      06-11 13:54:54.926: E/MediaRecorder(22582): start failed: -19
      06-11 13:54:54.961: E/AndroidRuntime(22582): FATAL EXCEPTION: Thread-2201
      06-11 13:54:54.961: E/AndroidRuntime(22582): java.lang.RuntimeException: start failed.
      06-11 13:54:54.961: E/AndroidRuntime(22582):  at android.media.MediaRecorder.start(Native Method)
      06-11 13:54:54.961: E/AndroidRuntime(22582):  at  com.Myapp.VideoPreview.Recorder_Prepare(VideoPreview.java:106)
      06-11 13:54:54.961: E/AndroidRuntime(22582):  at com.Myapp.VideoPreview.start(VideoPreview.java:94)
      06-11 13:54:54.961: E/AndroidRuntime(22582):  at com.Myapp.videoRecord$1.run(videoRecord.java:94)
      06-11 13:54:54.961: E/AndroidRuntime(22582):  at java.lang.Thread.run(Thread.java:856)

我在Samsung Nexus S中验证了该应用程序，但它没有SDCard支持。我用谷歌搜索了4小时，但找不到解决方案。上面的程序中有不推荐使用的方法吗？请帮助我解决问题。

最佳答案

Android 4.0引入了新的运行时检查，以确保您不会像访问主线程上的网络那样做傻事。

您是否在做一些愚蠢的事情，例如访问主线程上的网络？您的媒体是否正在通过网络流式传输，您从哪里调用VideoPreview.start()方法？