当标记Android Studio触发时，如何获取保存在Firebase中的数据

Question

I have 2 data inside firebase which is Latitude Longitude.

Example :

Data qwe0912830qwiejkasd Latitude : 12345 Longitude : 23412 qweoksldfmkl2091kmw Latitude : 23423 Longitude : 09801

I have 2 markers on maps and markers location based from data in firebase, what i need is, when i click 1 of 2 markers it shows latitude and longitude written in Toast.

This is what i did, but it crash when i click marker.

mMap.setOnMarkerClickListener(new GoogleMap.OnMarkerClickListener() {
            @Override
            public boolean onMarkerClick(Marker marker) {
                tujuan.setText(marker.getTitle());
                LatLng markerLocation = marker.getPosition();
                //Toast.makeText(MapsActivity.this, markerLocation+"", Toast.LENGTH_SHORT).show();               FirebaseDatabase.getInstance().getReference().child("Pariwisata").addValueEventListener(new ValueEventListener() {
                    @Override
                    public void onDataChange(DataSnapshot dataSnapshot) {
                            for (DataSnapshot snapshot: dataSnapshot.getChildren()) {
                                double latt = (double) snapshot.child("Latitude").getValue(Double.class);
                                double longg = (double) snapshot.child("Longitude").getValue(Double.class);
                                Toast.makeText(MapsActivity.this,latt+", "+longg, Toast.LENGTH_SHORT).show();
                            }
                    }
                    @Override
                    public void onCancelled(DatabaseError databaseError) {
                    }
                });

                return false;

            }
        });

Answer 1

Try this:

FirebaseDatabase.getInstance().getReference().child("Data").addValueEventListener(new ValueEventListener() {
public void onDataChange(DataSnapshot dataSnapshot) {
     for (DataSnapshot snapshot: dataSnapshot.getChildren()) {
        double latt = (double) snapshot.child("latitude").getValue();
        double longg = (double) snapshot.child("longitude").getValue();

     }
}