title: How can I Animate the color change of the statusbar and toolbar (like the new Calendar app does)
body: <p>The new Google Calendar app has an animation I would like to do in my app.  When you create a new event you can choose a color for the event.  When you do, the statusbar and toolbar change to that color with a circular effect that covers both of them.</p>
  
  <h2>Here's an example of what I'd like to do:</h2>
  
  <p><img src="https://i.stack.imgur.com/NpVCi.gif" alt="Google Calendar new event toolbar and statusbar color change"></p>
  
  <p>I can change the color of the statusbar and toolbar, but how can I apply the circular animation effect (or similar) to both of them as the color is changed?</p>