Android Transitions

Transcript

1. Transitions Bryan Herbst Senior Software Engineer The Nerdery

2. What is a Transition?  Easy way to animate a

   group of Views  Animates from one Scene to another Scene  Can be used to animate between Activities and Fragments

3. Scenes  Snapshot of a ViewGroup  Can be defined

   in Java or XML (or let the framework do it)

4. Making a transition

5. Making a transition (old) ObjectAnimator anim = ObjectAnimator.ofFloat(mButton, "alpha", 1f,

   0f); anim.start();

6. Making a transition (new) TransitionManager.beginDelayedTransition(mRoot, new Fade()); mButton.setVisibility(View.INVISIBLE);

7. AutoTransition  Fade  Move  Resize

8. How it works 1. beginDelayedTransition() => Take a snapshot of

   ViewGroup 2. Update Views 3. On next layout pass, Android takes another snapshot and creates animations Note: you can also define Scenes in XML

9. Activity Transitions

10. Activity Transitions (API 21)  Request Window.FEATURE_ACTIVITY_TRANSITIONS and Window.FEATURE_CONTENT_TRANSITIONS in

    both Activities  Set a transition name on the View in both Activities  Create a Bundle with  Call startActivity(intent, transitionBundle); makeSceneTransitionAnimation(activity, sharedView, viewTransitionName).toBundle();