Google Maps not bringing my markers from database

Question

I'm trying to get all the markers from my database, I have them stored this way

Now, I create two arraylists of markers, one to add all those markers and then pass it to the other one in order to delete them (I'm trying to refresh the markers in realtime as they show in the map).

But I have tried this to show the markers and it seems it shows me just the first one but not iterate through all the children. Here is what I have tried:

@Override
    public void onMapReady(final GoogleMap googleMap) {
        mMap = googleMap;

        mDatabase.child("usuarios").addListenerForSingleValueEvent(new ValueEventListener() {
            @Override
            public void onDataChange(@NonNull DataSnapshot dataSnapshot) {

                for (Marker marker : realTimeMarkers) {
                    marker.remove();
                }

                for(DataSnapshot snapshot : dataSnapshot.getChildren()){

                    MapsPojo mp = snapshot.getValue(MapsPojo.class);
                    Double latitud = mp.getLatitud();
                    Double longitud = mp.getLongitud();

                    MarkerOptions markerOptions = new MarkerOptions();
                    markerOptions.position(new LatLng(latitud,longitud));
                    markerOptions.snippet("ID: "+snapshot.getKey());
                    tmpRealTimeMarkers.add(mMap.addMarker(markerOptions));


                }

                realTimeMarkers.clear();
                realTimeMarkers.addAll(tmpRealTimeMarkers);


            }

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

            }
        });



    }

where realTimeMarkers and tmpRealTimeMarkers:

private ArrayList<Marker> tmpRealTimeMarkers = new ArrayList<Marker>();
    private ArrayList<Marker> realTimeMarkers = new ArrayList<Marker>();

Also the hint is not there, I run the debugger and it seems it's not entering in my foreach to fetch all the latitudes and longitudes.

use `addValueEventListener(new ValueEventListener(){` instead of `addListenerForSingleValueEvent(new ValueEventListener() {` — Peter Haddad, Aug 04 '18 at 17:13
i made a log, and i think its retrieving only one value -31.3703015Long-64.3575491 — Gastón Saillén, Aug 04 '18 at 17:18
its working now, i think i have missplaced the lat longs in firebase, thanks peter ! — Gastón Saillén, Aug 04 '18 at 17:19
i was thinking on valueeventlistener, but i think i will use a countdowntimer to refresh the dots each 10 seconds — Gastón Saillén, Aug 04 '18 at 17:20
this https://stackoverflow.com/questions/10032003/how-to-make-a-countdown-timer-in-android? addvalueventlistener will retrieve whenever data changes at the specific location — Peter Haddad, Aug 04 '18 at 17:24
yes, about eventlistener , my requirement is to fetch the data every 10 seconds , so yes, i need to use the countdowntimer to call onMapReady every 10 - 20 seconds, thanks peter ! — Gastón Saillén, Aug 04 '18 at 17:25
@Gastón: please run your questions through an English spell-checker prior to posting them. In particular, the contraction of "I am" is "I'm", with an apostrophe. The reference to yourself ("I") is always a capital letter. If you can do this for your readers, your questions will be easier to read for people who help you, as well as future readers. — halfer, Aug 04 '18 at 19:08

score 0 · Answer 1 · answered Aug 04 '18 at 19:07

0

(Posted on behalf of the question author).

Error solved! I have placed same markers at the database and they were stacked up.

answered Aug 04 '18 at 19:07

halfer

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Google Maps not bringing my markers from database

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