This Activity already has an action bar supplied by the window decor

Question

Trying to move over my stuff to use Toolbar instead of action bar but I keep getting an error saying

java.lang.RuntimeException: Unable to start         


        

Answer 1

If you get the error on this line:

setSupportActionBar(...);

You need to check if your activity is referring to a theme that contains a toolbar. Your application's AppTheme might already contain a toolbar, such as