SurfaceView.getHolder()

onCreate（）方法中时，
无法保持有效值。它还没有在那个运行时初始化。



活动有其他方法

can not hold a valid value while you are still in the onCreate() method. It''s not yet initialized at that runtime.

Activity has other methods

protected void onResume(); // before Activity run
protected void onPause(); // after Activity run

这是与 SurfaceView 互动的更好地方。



请同时阅读有关这些生命周期控制方法的文档：



活动 [ ^ ] @Android Documentation

That''s a better place to interact with the SurfaceView.

Please also read in the documentation about these lifecycle controling methods:

Activity[^] @ Android Documentation