Firebase android pagination

Question

I\'m building an app which will show videos stored on firebase. The list of videos needs to be paginated fetching most recent 20 videos at a time.

Here is

Answer 1

In the past (but no longer) a question regarding implementing Pagination to a query on Firestore was marked as a duplicate of this question I will answer for FireStore here.

Paginate a query on android Firestore

Query query = db.collection("cities")
        .orderBy("population")
        .limit(25);

Query next = query;

 private void loadCities() {

     query = next;
     query.get()
        .addOnSuccessListener(new OnSuccessListener() {
            @Override
            public void onSuccess(QuerySnapshot documentSnapshots) {

                // Get the last visible document
                DocumentSnapshot lastVisible = 
                documentSnapshots.getDocuments()
                        .get(documentSnapshots.size() -1);

                // Construct a new query starting at this document,
                // get the next 25 cities.
                next = db.collection("cities")
                        .orderBy("population")
                        .startAfter(lastVisible)
                        .limit(25);

            }
        });         
 }

Now just call the loadCities() method whenever you need to load more cities.