java - Not really understanding retrieving marker location from Firebase Database

Question

I looked for an answer and tried a lot of tutorials but i still can't get it right.I'm working on an app in which user can add marker to the map, and all the other users will see the marker. But i can't make it work because the markers from database never show.

this is my code for reading from database:

mLocation.addListenerForSingleValueEvent(new ValueEventListener() {
            @Override
            public void onDataChange(@NonNull DataSnapshot dataSnapshot) {

                MarkerLocation markerLocation = dataSnapshot.child("location").getValue(MarkerLocation.class);
                for (DataSnapshot s : dataSnapshot.getChildren()){
                double latitude = (double) (s.child("lat").getValue());
                double longitude = (double) ((s.child("lng").getValue()));
                LatLng location = new LatLng(latitude,longitude);
                mMap.addMarker(new MarkerOptions().position(location));
                }
            }

            @Override
            public void onCancelled(@NonNull DatabaseError databaseError) {

            }
        });

and firebase database look like this:

• application

    -location
          -marker
               -latitude:43.849
               -longitude:-109.737
  

Any help appriciated.

Answer 1

Waitting for answers