title: how to combine edit text with spinner
body: <p>I am writing simple login activity.
  I have login edit text and password edit text.
  I am kepping login and pasword via sharedpreferences.
  I want to make login field to rember previous logins (eg "aaa" and "aab") so when you type in edit text it give you some options and you can choose them to outo complite it. 
  How it can be done?</p>