Paging Library Invalidate Data Source

Question

What's the simplest way to invalidate data retrieved by the paging library? I need to do that on logout. I've a DataSource.Factory and a DataSource that extends PageKeyedDataSource. Is it a good idea to call invalidate() on DataSource contructor? Will it work as expected?

Answer 1

Assuming you are using the Paging library with other Architecture Components, such as LiveData and LifecycleOwner and your screen is closed on logout, the DataSource will be invalidated automatically.

If you don't, you still can invalidate it manually, calling

yourDataSource.invalidate();

After the invalidation, you won't be able to continue using the DataSource . However, the views from the adapter will not be detached automatically, so if you want to clear them, you should either provide from your DataSource.Factory a DataSource that will return no data either just clear the RecyclerView.Adapter manually.