Android - VideoView 需要按 BACK 两次才能退出

我有一个显示不同视频文件的活动。当我单击视频文件时，我会进入另一个 Activity，其中 VideoView 会播放视频。

我的问题是，当我想退出此活动并返回到上一个活动时，我应该单击两次后退按钮才能返回。如果我只单击一次，视频会再次开始播放，并且只有在第二次尝试时我才可以退出屏幕。

然后我尝试了这个：

@Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {
        if (keyCode == KeyEvent.KEYCODE_BACK) {
            Log.d(Constants.LOG_TAG, "back pressed in videoplayer");
            finish();
            return true;
        }
        return super.onKeyDown(keyCode, event);
    }

而且，尽管我在 logcat 中看到“在视频播放器中按下回键”，但该活动不会退出。我还是应该按两次后退按钮。

EDIT:这是最相关的（我认为）源代码。但请注意，视频是从互联网播放的，我没有使用媒体控制器，而是定义自己的布局并链接到视频视图控件。

public class VideoPlayer extends Activity implements OnClickListener, OnCompletionListener,
        OnSeekBarChangeListener, OnPreparedListener, OnTouchListener {


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.video_view);

        // Gets the position of clicked video, from an ArrayList of video urls.
        selectedVideo = getPosition();

        // the play button
        play = (ImageButton) findViewById(R.id.play);
        play.setOnClickListener(this);

        videoView = (VideoView) findViewById(R.id.videoView);
        videoView.setOnCompletionListener(this);
        videoView.setOnPreparedListener(this);
        videoView.setOnTouchListener(this);

        // the url to play
        String path = videoUris.get(selectedVideo);
        videoView.setVideoPath(getPath(path));
    }


    /**
     * Play or Pause the current video file.
     * 
     * If the video is paused, then invoking this method should start it. If the video is already playing, then the
     * video should pause.
     */
    private void play() {
        if (!isVideoStarted) {
            isVideoStarted = true;
            videoView.start();
            play.setImageResource(R.drawable.video_pause);
            videoSeekBar.post(updateSeekBarRunnable);
        } else if (isVideoStarted) {
            isVideoStarted = false;
            pause();
        }
    }

    /**
     * Start playing back a video file with the specified Uri.
     */
    private void startPlayback() {
        String path = videoUris.get(selectedVideo);
        videoView.setVideoPath(getPath(path));
        videoView.start();
    }

    /**
     * Stops the currently playing video. (The SeekBar position is reset to beginning, 0.)
     */
    private void stopPlayback() {
        videoView.stopPlayback();
    }

    /**
     * Pause the currently playing video. (The SeekBar remains in its position.)
     */
    private void pause() {
        videoView.pause();


    @Override
    public void onPrepared(MediaPlayer mp) {        
        play();
    }
}

下面的代码对我来说效果很好：

            try
            {
            MediaController mc = new MediaController(YourActivity.this);
            mc.setAnchorView(vd);
            Uri uri = Uri.parse(YourURL);
            vd.setMediaController(mc);
            vd.setVideoURI(uri);
            //vd.start();
            }catch(Exception e)
            {
                Log.e("Error", e.getMessage());
                e.printStackTrace();
            }
            vd.requestFocus();
            vd.start();

@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
    // TODO Auto-generated method stub
    if(keyCode == KeyEvent.KEYCODE_BACK)
    {
        finish();
        return true;
    }
    return super.onKeyDown(keyCode, event);
}