无法在模拟器中播放视频

Question

public class VideoViewActivity extends Activity {
    private String vSource;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
              super.onCreate(savedInstanceState);

              setContentView(R.layout.videoviewacti);
              VideoView vView = (VideoView)findViewById(R.id.videovw);
              vView.requestFocus();
              String LINK = ConstantData.urlVideo;
              Log.i("path of video",""+LINK);
              vView.setVideoURI(Uri.parse(LINK));

              //vView.setVideoPath("sdcard/test30fps.mp4");
              MediaController mediacontroller = new MediaController(this);
              vView.setMediaController(mediacontroller);
              vView.start();
    }
}

此处视频无法在模拟器中播放。它显示错误，如“无法播放视频” 视频格式是web服务上的mp4。 当它打开视频文件时，媒体播放器的控件将被禁用。