i tried to update the number of points of specific user and i dont know why it is dont work.

dbReference.child(uname).child(“points”).addListenerForSingleValueEvent(new ValueEventListener() {
@Override
public void onDataChange(@NonNull DataSnapshot snapshot) {
if (snapshot.exists()) {
int points2 = snapshot.getValue(Integer.class) + pointsToAdd;
Log.i(“TAG2″, points2+””);

                Map<String, Object> update = new HashMap<>();
                update.put("points", points2);

                dbReference.child(uname).updateChildren(update)
                        .addOnSuccessListener(aVoid -> Log.i("TAG2", "Hello"))
                        .addOnFailureListener(e -> Log.i("TAG2", "No"));
            }
        }

        @Override
        public void onCancelled(@NonNull DatabaseError error) {
            Log.e("TAG2", "Error fetching points", error.toException());
        }
    });

{
“rules”: {
“.read”: true,
“.write”: true
}
}