How to fix: “You need to use a Theme.AppCompat theme (or descendant) with this activity”

Question

I am having trouble running my Android app in a fullscreen mode per instructions of a video. When it tries to run, the app crashes with the error.

\"You need t

Answer 1

If you add the android:theme="@style/Theme.AppCompat.Light" to in AndroidManifest.xml file, problem is solving.