FirebaseAuth mAuth; DatabaseReference mRootRef ;
mRootRef = FirebaseDatabase.getInstance().getReference();
private void writeNewUser(String name, int budget) {
String id = mRootRef.child("Person").push().getKey();
Person person = new Person(name,budget, 0,0, id);
mRootRef.child("Person").child(person.getId()).setValue(person);
}