Because you are accessing the method with static reference
means with class name..
You have to make a instance of
DatabaseHandler class and use that method.
Or make a
updateScores as static method like,
static public void updateScores()
But I have a doubt you have more codes in
DatabaseHandler Class. (As its sqlite database helper class you are using Activity context in this class) so better to make instance of
DatabaseHandler class and use method
updateScores() with instance.