Android Google IO 2014: How to implement Activity transition with fragments?

Question

How to implement Android 5, Lollipop, Activity Transitions using fragments?

Answer 1

The API is pretty similar to Activity Transitions, albeit limited in some ways due to the difference between starting an activity and a fragment transaction.

Here are the basics:

1. Use a common string when defining android:transitionName or View.setTransitionName on the views you intend to share between the fragments
2. When creating a fragment transaction, call: FragmentTransaction.addSharedElement(View sharedElement, String name) with the view you intend to share (and its transition name).
3. Specify the Transition that you want to be run on the fragment via: Fragment.setSharedElementEnterTransition(Transition transition)
4. If you want to run multiple transitions, use a TransitionSet to aggregate them.