title: Using Google Design Library how to hide FAB button on Scroll down?
body: <p>Google have released Design library, I am using</p>
  
  <pre><code> compile 'com.android.support:design:22.2.1'
  </code></pre>
  
  <p>However I cant see any code examples of how to use this library and how to animate the <code>FAB</code> bar on scroll. I guess I can listen for scroll events on the <code>ListView</code> and then animate the button myself, but is this not baked into the API (is this not the point of this support library).</p>
  
  <p>Is there examples for this ?</p>