.MainActivity}: java.lang.IllegalStateException: You need to use a Theme.AppCompat theme (or descendant) with this activity. code example

Example 1: how to solve Caused by: java.lang.IllegalStateException: You need to use a Theme.AppCompat theme (or descendant) with this activity.

<application
    android:theme="@style/AppTheme">

Example 2: how to solve Caused by: java.lang.IllegalStateException: You need to use a Theme.AppCompat theme (or descendant) with this activity.

<activity android:name=".MainActivity"
    android:theme="@style/AppFullScreenTheme" >