Pagination with cloud firestore in flutter

In order to implement pagination with Cloud Firestore in Flutter, you will need to use the Cloud Firestore Flutter package. Here is an example of how you can paginate through a collection in Cloud Firestore:

import 'package:cloud_firestore/cloud_firestore.dart';

// Reference to the collection
CollectionReference collectionReference = FirebaseFirestore.instance.collection('myCollection');

// Query to get the documents in the collection
Query query = collectionReference.orderBy('timestamp', descending: true).limit(10);

// Get the snapshot of the query
Stream<QuerySnapshot> querySnapshot = query.snapshots();

// Use a StreamBuilder to display the data
StreamBuilder<QuerySnapshot>(
  stream: querySnapshot,
  builder: (context, snapshot) {
    if (snapshot.hasError) {
      return Text('Error: ${snapshot.error}');
    }
    if (snapshot.hasData) {
      return ListView.builder(
        itemCount: snapshot.data.docs.length,
        itemBuilder: (context, index) {
          DocumentSnapshot documentSnapshot = snapshot.data.docs[index];
          // Display the data from the document snapshot
          return Text(documentSnapshot.data()['title']);
        },
      );
    }
    return CircularProgressIndicator();
  },
);

To paginate to the next page of results, you can use the startAfter method on the query to get the next set of documents. You will need to keep track of the last document that was returned in the previous page and pass it as the argument to startAfter.

Here is an example of how you can paginate to the next page:

// Get the last document in the current page
DocumentSnapshot lastDocument = snapshot.data.docs.last;

// Create a new query to get the next set of documents
Query nextQuery = collectionReference
    .orderBy('timestamp', descending: true)
    .startAfter([lastDocument])
    .limit(10);

// Get the snapshot of the next query
Stream<QuerySnapshot> nextQuerySnapshot = nextQuery.snapshots();

// Use a StreamBuilder to display the data from the next query snapshot

You can also use the DocumentSnapshot returned from the query to get the DocumentReference of the document and use it to paginate to the next document. For example:

// Get the reference to the last document in the current page
DocumentReference lastDocumentReference = snapshot.data.docs.last.reference;

// Create a new query to get the next document
Query nextQuery = lastDocumentReference.get().then((documentSnapshot) {
  if (documentSnapshot.exists) {
    // The document exists, get the next document
    DocumentReference nextDocumentReference = collectionReference
        .orderBy('timestamp', descending: true)
        .startAfter([documentSnapshot])
        .limit(1)
        .get()
        .then((snapshot) {
      // Display the data from the next document snapshot
    });
  } else {
    // The document does not exist, handle the error
  }
});

I hope this helps!