DiffUtil
Intro
DiffUtil is a utility class by Google that calculates the difference between two lists and outputs a list of update operations that converts the first list into the second one.
Problem
Say, we use room database. Now we add one item to room which has previous n items. So after adding it should reflect in recycler view. Now, what recycler view does is that it renders all items.
This is a performance issue.
Solution
There are 2 ways 2 implement Diff Utils:
1. Recycler View Adpater
- We have to implement Diff Util.
2. List Adapter
- By default Diff Util is implemented.
- Automatically use Diff Util, execute difference in background.
Both are implemented in the code. For 1 check ProgrammingListAdapter and for 2 check ProgrammingRecyclerViewAdapter.
Happy coding ??
Demo
