 previous resource's alpha to 0 while
     animating the new resource's alpha to 100. Otherwise, only animates the new resource's
     alpha to 100 while leaving the previous resource's alpha at 100. See <code>TransitionDrawable.setCrossFadeEnabled(boolean)</code>.</dd>
</dl>
</li>
</ul>
</li>
</ul>
<!-- ============ METHOD DETAIL ========== -->
<ul class="blockList">
<li class="blockList"><a name="method.detail">
<!--   -->
</a>
<h3>Method Detail</h3>
<a name="transition-android.graphics.drawable.Drawable-