Define an Interface

In this exercise, you'll be defining an interface in the MasterListFragment class, and have it "callback" or communicate up to it's host activity.

Exercise Code

Exercise: TFragments.05-Exercise-InterfaceCommunication

Why interfaces?

To keep fragments modular and reusable, you cannot have them communicate directly with one another or directly tied to a host activity. An interface gives you a way to communicate but also stay modular because it can be implemented by any host activity -- this way the fragment is not tied directly to an activity.