Fragment 2 fragment communicating

Question

Why i should use the Communicating with Other Fragments pattern when I could simply use

((MyActivity)getActivity()).doFoo();

In my Fragmen

Answer 1

Because it creates a strong direct coupling of your Fragment and your Activity, thus decreasing the re-usability of your Fragment : you can only use it with this Activity.

Using an interface to mediate the communication is more flexible has multiple activities can now embed your Fragment, they just have to implement the communication interface.

That's equivalent in term of program execution, but it's a better design, quite close from the Observable-Observer design pattern.

Also note that they are alternative solutions :

• Otto
• EventBus
• RoboGuice events

Those solutions are even cleaner and will lead to more elegant code.