n.
 This method's default behavior is to call <a href="#onAnimationStart(icyllis.modernui.animation.Animator)"><code>onAnimationStart(Animator)</code></a>. This
 method can be overridden, though not required, to get the additional play direction info
 when an animation starts. Skipping calling super when overriding this method results in
 <a href="#onAnimationStart(icyllis.modernui.animation.Animator)"><code>onAnimationStart(Animator)</code></a> not getting called.</div>
<dl class="notes">
<dt>Parameters:</