The document discusses the implementation of RecyclerView in Android, emphasizing its advantages over ListView and GridView through the use of the ViewHolder pattern and item animations. It provides valuable resources like Stack Overflow links and GitHub repositories for further exploration of RecyclerView animations. Additionally, it includes best practices for managing animations and items effectively within a RecyclerView context.

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3. RECYCLER VIEW
Replaces ListView and GridView
Force usage of ViewHolder pattern
More work for a developer

4. MANUAL WORK
No dividers
No onItemClickListener
LayoutManager

5. ANIMATIONS

6. http://stackoverflow.com/questions/3928193/how-to-animate-
addition-or-removal-of-android-listview-rows
HOW ANIMATION WORKS
RecyclerView.ItemAnimator
DefaultItemAnimator
animateAppearance() → notifyItemInserted(int)
animateChange() → notifyItemChanged(int)
animateDisappearance() → notifyItemRemoved(int)
animatePersistence() → notifyItemMoved(int, int)
RecyclerView.ItemAnimator RecyclerView.Adapter

7. SIMPLE ITEM ANIMATOR
animateAdd
animateMove
animateChange
animateRemove

8. https://github.com/wasabeef/recyclerview-animators
BEFORE YOU START TO CODE
21 Animators
5 Adapters
3000+ stars

9. DO’S AND DON’TS

10. PREPARE HOLDER FOR ANIMATION
Initialize view properties before animation start
When saving for run pending

11. RESET ANIMATIONS
endAnimation(ViewHolder)
Missing views
Ghost Views

12. ALWAYS CALL DISPATCH END
dispatchMoveFinished
dispatchAddFinished
dispatchRemoveFinished
dispatchChangeFinished

13. WATCH ANIMATIONS ORDER
runPendingAnimations
Depends on the desired behaviour
Animation start delay

14. DECORATOR ANIMATIONS
Dividers draw over the items
Animate in the ItemDecoration
Move decoration into the view

15. PREDICTIVE ANIMATIONS
Animate holder currently not visible
Could cause problems with multiple view types
Option to turn off

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