title: Custom RelativeLayout to have circular boundary
body: <p>I have a requirement to show a View which need to have a circular boundary.
  I know it can be done by Extending the RelativeLayout. But exactly dont know what all methods to override except constructors and what code changes I have to make for it to show circular boundary.</p>
  
  <p>Updated question with Image.
  So basically this is an animation.
  and minutely the view goes out from screen from the circumference of the circle (And not as rectangular view).
  So I have to create a circular view (Relative Layout) that is having child of these images.
  <img src="https://i.stack.imgur.com/uGxN6.png" alt="Image which have circular corner view"></p>