Retrieve location data from Firebase not getting on MapActivity

So, what I'm trying to get is latitude and longitude from my database reference path "Driver Location". But, it happens nothing but just shows normal google map without triggering to location. Please help!

public class StudentMapActivity extends FragmentActivity implements OnMapReadyCallback {
private GoogleMap mMap;
private DatabaseReference databaseReference;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_student_map);
FirebaseDatabase database = FirebaseDatabase.getInstance();
databaseReference = database.getReference("Driver Location");
// Obtain the SupportMapFragment and get notified when the map is ready to be used.
SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()
.findFragmentById(R.id.map);
mapFragment.getMapAsync(this);
}
@Override
public void onMapReady(final GoogleMap googleMap) {
mMap = googleMap;
databaseReference.addListenerForSingleValueEvent(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
for (DataSnapshot child : dataSnapshot.getChildren()) {
String lat = child.child("latitude").getValue().toString();
String lng = child.child("longitude").getValue().toString();
double latitude = Double.parseDouble(lat);
double longitude = Double.parseDouble(lng);
LatLng latLng = new LatLng(latitude, longitude);
MarkerOptions markerOptions = new MarkerOptions()
.position(latLng)
.title("Bus is here");
mMap.addMarker(markerOptions);
mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(latLng, 16));
}
}
@Override
public void onCancelled(@NonNull DatabaseError databaseError) {
}
});
}
}

The Logcat:

2020-07-24 00:41:18.926 22586-22586/com.example.upmbus D/InputTransport: Input channel destroyed: '1df605 ', fd=100
2020-07-24 00:41:18.939 22586-23234/com.example.upmbus W/.example.upmbu: Accessing hidden method Lsun/misc/Unsafe;->getLong(Ljava/lang/Object;J)J (greylist,core-platform-api, linking, allowed)
2020-07-24 00:41:18.940 22586-23234/com.example.upmbus W/.example.upmbu: Accessing hidden method Lsun/misc/Unsafe;->putLong(Ljava/lang/Object;JJ)V (greylist, linking, allowed)
2020-07-24 00:41:18.942 22586-23234/com.example.upmbus W/.example.upmbu: Accessing hidden method Lsun/misc/Unsafe;->getObject(Ljava/lang/Object;J)Ljava/lang/Object; (greylist, linking, allowed)
2020-07-24 00:41:18.942 22586-23234/com.example.upmbus W/.example.upmbu: Accessing hidden method Lsun/misc/Unsafe;->getInt(Ljava/lang/Object;J)I (greylist, linking, allowed)

The database details attached

There is no need to loop through the DataSnapshot object because you only have two properties there, and both can be accessed directly like in the following lines of code:

DatabaseReference rootRef = FirebaseDatabase.getInstance().getReference();
DatabaseReference driverLocationRef = rootRef.child("Driver Location");
ValueEventListener valueEventListener = new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
double latitude = dataSnapshot.child("latitude").getValue(Double.class);
double longitude = dataSnapshot.child("longitude").getValue(Double.class);
Log.d("TAG", latitude + ", " + longitude);
}
@Override
public void onCancelled(@NonNull DatabaseError databaseError) {
Log.d("TAG", databaseError.getMessage()); //Don't ignore errors!
}
};
driverLocationRef.addListenerForSingleValueEvent(valueEventListener);

The result in the logcat will be:

3.0227801, 101.71208

Besides that, using:

String lng = child.child("longitude").getValue().toString();

Doesn't make any sense since both properties hold a double value and not a String.