AppCompatActivity is a class that goes about as the super class for exercises that need to exploit the help library activity bar highlights.
The prerequisite to utilize the android.support.v7.app.ActionBar inside you movement are:
To run API level 7 or higher.
At that point broaden this class.
Set you movement topic to android.support.v7.appcompat.R.style#Theme_AppCompat Theme.AppCompat or comparative subject.
Topics do get set in the AndroidManifest.xml e.g