title: Android Overlay at bottom of the screen
body: <p>I want to implement the ads in my app but I want to implement 
  the ads on an overlay view, The main content of the app should be 
  foreground and the overlay is top of the main content  and I want 
  to align the overaly at the bottom of the screen. Kindly tell me how
  I can achieve the overlay at the bottom of my screen???</p>