title: Drop Down Menu on Action bar
body: <p>I am working on an android application Menu with Action Bar, I want to put the dropdown menu in the action bar like the one present in Google Maps application. 
  <img src="https://i.stack.imgur.com/Bok6z.png" alt="Google Maps ActionBar"></p>
  
  <p>Can somebody help me? How to achieve this Please point to some easy tutorial that I can follow.  </p>