How can i retrieve an array of geopoints that are saved in a firestore database to a latLng arraylist

Question

I stored a couple of geopoints in a geopoint array in firebase database

      CollectionReference propRef = db.collection("Prpoerty");
         propRef.get().addOnCompleteListener(new     OnCompleteListener<QuerySnapshot>() {
            @Override
        public void onComplete(@NonNull Task<QuerySnapshot> task) {
            if (task.isSuccessful()) {
                for (QueryDocumentSnapshot document : task.getResult()) {
                    GeoPoint geoPoint = document.getGeoPoint("vertex");
                    double lat = geoPoint.getLatitude();
                    double lng = geoPoint.getLongitude();
                    points.add (new LatLng(lat, lng));
                }
            } else {
                Log.w("foobar", "Error getting documents.",     task.getException());
            }
        }


    });
        System.out.println(points);

I expected something like a standard latlng arrayList. But instead got

Displays Error java.lang.RuntimeException: Field 'vertex' is not a com.google.firebase.firestore.GeoPoint at com.google.firebase.firestore.DocumentSnapshot.castTypedValue(com.google.firebase:firebase-firestore@@20.1.0:562)

Screenshot of firestore

Answer 1

All array type fields in Firestore will come back as List type objects. You need to write your code to expect a List<Object> , then cast each item to GeoPoint .