Android FirestorePagingAdapter from multiple ViewTypes

Question

I’m trying to display different views in a RecyclerView using the FirestorePagingAdapter basing on a field value returned from the database (which is type). How can I modify this to set a specific view to the RecyclerView for each list item.

  FirestorePagingAdapter<FeedItem, FeedViewHolder> pagingAdapter = new FirestorePagingAdapter<FeedItem, FeedViewHolder>(options) {

            @NonNull
            @Override
            public FeedViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
                // HANDLE VIEW TYPE
                return null;
            }

            @Override
            protected void onBindViewHolder(@NonNull FeedViewHolder holder, int position, @NonNull FeedItem model) {
                // ADD DATA TO VIEW
            }
        };

If you understand Kotlin and you want to learn a modern way in which you can paginate Firestore documents, then this [resource](https://medium.com/firebase-tips-tricks/how-to-implement-pagination-in-firestore-using-jetpack-compose-76b4c0b5acd5) will help. Here is the corresponding [repo](https://github.com/alexmamo/FirestorePaginationJetpackCompose). — Alex Mamo, Aug 08 '23 at 05:51

score 0 · Accepted Answer · answered Aug 08 '23 at 01:00

You'll need to implement getItemViewType in addition to the methods you already have.

The flow is that:

the adapter first calls your getItemViewType method with the position of the item it wants to render,
you then return a number that indicates the type of view you want to render for the position,
the adapter then calls onCreateViewHolder with the type,
you use that to create and return a view of the correct type, which
the adapter them passes to onBindViewHolder.

For examples of this, see:

question: onBindViewHolder and onCreateViewholder of FirebaseRecyclerAdapter are not getting called
question: How do I access the item in FirebaseRecycler's getItemViewType()?
comment in the repo (which is for Realtime Database, but the flow is the same).

Android FirestorePagingAdapter from multiple ViewTypes

1 Answers1