Prevent the app activity from resuming by rotating the [duplicate] screen

To prevent the activity from restarting when changing the orientation, you must put the following line in the declaration of your Activity in the manifest: android:configChanges="orientation" remaining as follows:

<activity android:name=".MyActivity"
          android:configChanges="orientation|keyboardHidden|screenSize"
          android:label="@string/app_name">

For more information you can check the official Android documentation