Do I have to study all libraries of java to be a professional programmer for android studio?

Question

Do I have to study all libraries of java to be a professional programmer for android studio?

Answer 1

No. Android Studio needs a slightly modified Java. So, knowing how something can be done in Java is enough.

Answer 2

There is no need for that. you only use a particular library only when it is needed. Knowledge about the common ones wouldn't hurt though