[android-developers] Re: Is it possible to draw to a home screen icon?

Try Live Wallpapers: http://developer.android.com/resources/articles/live-wallpapers.html

App icons are not accessible outside the launcher. At best, you might
be able to hack something by turning activity aliases on and off and
"changing" an app icon that way. That is, you might have an second app
icon that serves as a kind of notification, for example, and you could
turn it on/off, or run through a sequence of icon variations, with
PackageManager calls to enable/disable the component names
corresponding to the aliases. But there is no way to "borrow" the
Launcher's app icon views and draw into them.

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