title: Creating Custom Overlay on the map
body: <p>I am trying to replicate this feature of Maps in Android:
  <img src="https://i.stack.imgur.com/IF99l.png" alt="Custom Map Overlay"></p>
  
  <p>You can see that on the map, there's a Circle depicting the range that the user has selected.</p>
  
  <p>In my application, I'll also want a dragger to reside on the perimeter of the circle, which can be dragged to redefine radius.</p>
  
  <p>If someone could tell me how to draw custom drawable overlays and 2D graphics over map, I can do other things on my own.</p>
  
  <p>Thanks!</p>
  
  <p>The full application can be reached at <a href="http://www.geochirp.com" rel="noreferrer">this link</a></p>