Why AppCompat does not support the current theme features windowActionBar: false

Question

Why AppCompat does not support the current theme features { windowActionBar: false, windowActionBarOverlay: false, android:windowIsFloating: false, windowActionModeOverlay:

Answer 1

You need to check both styles files styles.xml and styles.xml(v21) in case you have it in your code.

Both styles files must have a parent theme based on the Theme.AppCompat theme, or a child of it.