title: FloatingActionButton hide on list scroll
body: <p>Im using the <code>FloatingActionButton</code> from the <code>android.support.design.widget</code> package:</p>
  
  <pre><code>&lt;android.support.design.widget.FloatingActionButton
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:layout_alignParentBottom="true"
      android:layout_alignParentEnd="true"
      android:layout_marginBottom="20dp"
      android:layout_marginEnd="16dp"
      android:clickable="true"
      android:backgroundTint="@color/primaryColor"
      android:src="@drawable/ic_search_white_24dp"
      app:borderWidth="0dp"
      app:elevation="6dp"
      app:backgroundTint="@color/primaryColorDark"
      app:rippleColor="@color/accentColor" /&gt;
  </code></pre>
  
  <p>Is it possible to configure that button to hide with an animation when the listview is scrolling down and to show it again when listview is scrolling up to the top?</p>