title: Mask of a circle using shape?
body: <p>i want to put a view over my android interface.
  this is the idea:</p>
  
  <p><a href="https://i.stack.imgur.com/1cuXi.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/1cuXi.jpg" alt="enter image description here"></a></p>
  
  <p>I´m using a shaoe, but can not find the way to create it, I need the transparent part to be the inside of the circle and everything around it is solid.
  I have searched both here and on other websites, but without success.</p>
  
  <p>Thank you very much in advance</p>