android - 播放视频时应用程序崩溃

Question

我正在全屏模式下播放视频。我使用 videoview 播放了一个视频，它播放得很好，但不幸的是，当它处于播放状态时点击视频时它会崩溃。而且播放视频后，如果我们单击后退按钮，应用程序就会崩溃。以上两个条件我得到相同的异常 android.view.WindowManager$BadTokenException。下面是我的代码。

public void previewVideo(Uri mediaUri) {         

            videoPreview.setVideoURI(mediaUri);
            MediaController mediaController = new MediaController(getApplicationContext());
            mediaController.setAnchorView(videoPreview);
            videoPreview.setMediaController(mediaController);
            videoPreview.requestFocus();
            videoPreview.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {
                // Close the progress bar and play the video
                public void onPrepared(MediaPlayer mp) {

                    videoPreview.start();
                }
            });

异常

11-07 19:22:26.524    1229-1229/com.ontometrics.parent E/InputEventReceiver﹕ Exception dispatching input event.
11-07 19:22:26.524    1229-1229/com.ontometrics.parent E/MessageQueue-JNI﹕ Exception in MessageQueue callback: handleReceiveCallback
11-07 19:22:26.534    1229-1229/com.ontometrics.parent E/MessageQueue-JNI﹕ android.view.WindowManager$BadTokenException: Unable to add window -- token null is not valid; is your activity running?
            at android.view.ViewRootImpl.setView(ViewRootImpl.java:771)
            at android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java:278)
            at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:69)
            at android.widget.MediaController.show(MediaController.java:346)
            at android.widget.MediaController.show(MediaController.java:306)
            at 
            at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2434)
            at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2123)

Answer 1

使用

MediaController mediaController = new MediaController(MyActivity.this);

代替

MediaController mediaController = new MediaController(getApplicationContext());