[android-developers] How to animate a drawable inside an App Widget?

This question was raised a few months ago here:
http://groups.google.com/group/android-developers/browse_thread/thread/34998e68be131cf2/62690a91fe23cb18?lnk=raot

which suggests that animations cannot be done within an App Widget.

However, I'm sure I've seen some App Widgets animating...

I have an App Widget which contains an ImageView. When the user clicks
on this Widget I would like the ImageView to continuously rotate until
a certain task (think synchronization) completes. This can take
anywhere from a few seconds to a few minutes.

How can this be best achieved?
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