Working with Recyclerview

Mostly mobile apps rely on showing data as a list. This talk will cover basic stuff about working with RecyclerView explaining showing different view types, customizing item decorations, etc.

Transcript

1. Working with RecyclerView
2. Poe Poe Myint Swe Android Engineer 99.co
3. 99.co
4. Why RecyclerView?
5. Isn’t ListView fine ?
6. Flexibility!
7. – RecyclerView “Do one thing and do it well”
8. Components • RecyclerView: create view, bind data and recycles • Adapter: provide data • ViewHolder: hold sub views • LayoutManager: layout and position view • ItemDecorator: decorate each item • ItemAnimator: animate changes
9. • onCreateView(): create and return view holder • onBindViewHolder(): bind data • getItemCount(): item count of adapter
10. Change all things to RecyclerView!
11. “Building Complex Views (aka) Multiple View Rows with RecyclerView”
12. • getItemType(): return item type by data type • onCreateView(): inflate & create different view holder according to item type • onBindView(): bind data according to holder
13. // Create a model object inside adapter
 public class ListItem {
 public Object item;
 public int itemType;
 }
14. private ArrayList<LitItem> items = new ArrayList<>();
 private void createItems() {
 items.clear();
 
 LitItem listItem = new LitItem();
 listItem.item = "This is example text";
 listItem.itemType = 1;
 
 LitItem listItem2 = new LitItem();
 listItem.item = 100;
 listItem.itemType = 2;
 
 LitItem listItem3 = new LitItem();
 listItem.item = 10f;
 listItem.itemType = 3;
 }
15. Notify changes NotifyItemRangeInserted() NotifyItemRangeRemoved() NotifyItemRemoved()
16. Custom Interface
17. Forgetting to notify the changes?
18. Mistakes • Any UI or View changes user made need to tie to data item. • Notify the changes, ALWAYS. • Get the item count right!
19. Improvement • DiffUtil • Pattern Matching
20. MMAUG http://mmaug.org
21. Thank You!