Android :: Add Some Animation On App Widget

When writing an App Widget based on Cupcake, I create a remote view like this:

views = new RemoteViews(context.getPackageName(), R.layout.widget_loading);

However, the widget_loading.xml contains <ViewAnimator>. The ViewAnimator don't have @RemoteView tag, so it's can not be inflated in remote view.

To fix this, I define a MyViewAnimator (which most likely the ViewAnimator in android) with @RemoteView tag in my project. Then use MyViewAnimator class in the layout xml file. But it failed, there was a exception that class loader cann't find MyViewAnimator class.

So the problem is: how to use any animation in the remote view? Is it possible adding some visual effects on app widget?