NullPointerException with android.support.v7.widget.Toolbar

Question

I am currently trying to implement a navigation drawer in my app. I am having an issue with the Toolbar being null. I have done many searches online and tried many different

Answer 1

I had an issue with Toolbar that wasn't of support.v7 I mean that you must add android.support.v7.widget. before the cast you realize when finding Toolbar with ID...