How to get Activity's content view?

Question

What method should I call to know if an Activity has its contentView (once the method setContentView() has been called)?

Answer 1

this.getWindow().getDecorView().findViewById(android.R.id.content)

or

this.findViewById(android.R.id.content)

or

this.findViewById(android.R.id.content).getRootView()

Answer 2

You can also override onContentChanged() which is among others fired when setContentView() has been called.