Android custom media controller using vidtry

I want to use a custom media controller in my Android app and therefore looking at the vidtry code (http://github.com/commonsguy/vidtry), especially Player.java:

The sample works fine as it comes. But I want the sample to play the fixed video automatically on app startup (so I don't want to enter a URL). I added:

 @Override
 public void onResume() {
  super.onResume(); 
  address.setText("/sdcard/mydata/category/1/video_agkkr6me.mp4");
  go.setEnabled(true);
  onGo.onClick(go);  
 }

Strange thing here is that if I run the app, the audio of the video plays but the image doesn't show. Everything else works fine (progress bar, etc.). I can't figure out the difference between the manual click on the go-button and the programmatic one. I looked at the code and didn't see any difference that might occur between manual and programmatic click.

I checked if any elements (esp. surface) might be hidden, but it's not. I even tried a

surface.setVisibility(View.INVISIBLE);
surface.setVisibility(View.VISIBLE);

in case of some issue with the redrawing, but no difference.

The video image does show when I man开发者_如何学编程ually hit the go button, but just not on start up automatically.

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It seemed that the surface wasn't ready at onResume yet. Implementing SurfaceHolder.Callback and then starting the video from surfaceCreated(SurfaceHolder holder) solves the problem.