准备错误后，Android 4.3 VideoView上的java.lang.NullPointerException

Question

我的活动基本上是一个“媒体”播放器，可以播放某些内容（例如图像，视频，RSS提要等），我使用不同的布局文件。我有一个播放列表，硬件或模拟器编解码器不支持某些视频。因此，当我在尝试加载视频时遇到错误时，我只需移动到下一个并尝试播放它。

问题是我收到加载错误后开始播放下一个媒体。我的videoPlayer布局上的VideoView会抛出一个NPE并崩溃应用程序：S

我使用版本4.1.2,4.2.2,4.3和2.3.3在模拟器上进行了测试。所有4.x.x版本都显示了问题...

以下是试图播放视频的片段。

...
    videoView = (VideoView) getActivity().findViewById(R.id.videoview);

    videoView.setVideoPath(currentMediaPath);

    videoView.setOnErrorListener(new OnErrorListener()
    {
        @Override
        public boolean onError(MediaPlayer player, int what, int extra)
        {
            String message = "error: [" + currentIndex + "] " + currentMediaPath + " what: " + what + " extra: "
                    + extra;
            L.error(getLogger(), "onError: " + player + " - " + message);

            boolean delegated = false;

            try
            {
                if (isPreparing() && delegateOnError)
                {
                    delegatePlayback();
                    delegated = true;
                }
            }
            catch (Exception e)
            {
                L.error(getLogger(), "onError: error delegating playback -> " + player, e);
            }

            if (!delegated)
            {
                notifyError(new Exception(message));
            }

            return true;
        }
    });
...

这是崩溃......

java.lang.NullPointerException
    at android.view.SurfaceView.updateWindow(SurfaceView.java:574)
    at android.view.SurfaceView.access$000(SurfaceView.java:81)
    at android.view.SurfaceView$3.onPreDraw(SurfaceView.java:169)
    at android.view.ViewTreeObserver.dispatchOnPreDraw(ViewTreeObserver.java:671)
    at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1820)
    at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1000)
    at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:4214)
    at android.view.Choreographer$CallbackRecord.run(Choreographer.java:725)
    at android.view.Choreographer.doCallbacks(Choreographer.java:555)
    at android.view.Choreographer.doFrame(Choreographer.java:525)
    at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:711)
    at android.os.Handler.handleCallback(Handler.java:615)
    at android.os.Handler.dispatchMessage(Handler.java:92)
    at android.os.Looper.loop(Looper.java:137)
    at android.app.ActivityThread.main(ActivityThread.java:4745)
    at java.lang.reflect.Method.invokeNative(Native Method)
    at java.lang.reflect.Method.invoke(Method.java:511)
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
    at dalvik.system.NativeStart.main(Native Method)