title: How to animate circles in android
body: <p>I'm new to android and want to play a little with animation.
  What I want to do:</p>
  
  <p><img src="https://i.stack.imgur.com/1j5RW.png" alt="circles animation"></p>
  
  <p>Each tiny circle should be clickable, and for now only number 2 can take 1's place and viceversa. I think I know how to draw the circle and positionate the tiny circles around it (I'm working on it :P) but I have no clue on how to implement the animation. Any ideas? Thanks in advance!</p>