Firebase Database Paging Support - [New Feature-Pagination]

[PatilShreyas]

Firebase Realtime Database has FirebaseRecyclerAdapter to show Data Items in RecyclerView. But, the issue is it has not Paging support added until now. I have developed a solution on Pagination of Firebase Database in RecyclerView on below repository with library code and sample app.
https://github.com/PatilShreyas/FirebaseRecyclerPagination

I referred source code of FirestorePagingAdapter while developing the solution.
FirebaseRecyclerPagingAdapter is built on top of Android Paging Support Library.
So, I request you to please permit me to add this feature in the official FirebaseUI library to help developers with this paging library to load data in pages.
Can I fork this repository and make this feature available?

[samtstern]

@PatilShreyas thanks for filing this! So since you based this on the Firestore adapter, does that mean the tradeoffs are the same? In particular, does the adapter ignore realtime updates?

[PatilShreyas]

Yes. Till now, it does not support realtime updates.

[samtstern]

@PatilShreyas ok in that case I'd be happy to review this feature! Can you send a Pull Request with the target branch as version-4.3.2-dev?

[PatilShreyas]

@samtstern Thank you !
I will do it.

[PatilShreyas]

@samtstern I have updated code as you suggested here #1603
Implemented the same as Firestore version.