What method you should override to use Android menu system?
To specify the options menu for an activity, override onCreateOptionsMenu() (fragments provide their own onCreateOptionsMenu() callback).
What Activity method you use to retrieve a reference to an Android view by using the id attribute of a resource XML?
The findViewById(int id) method looks for a child view with the given id.
Which of the following is not an Android component (i.e. a point from which the system can enter your application)?
Here are the four types of app components: Activities, Services, Content providers, and Broadcast receivers.