You really don't want to do that. If you have an .apk that is using private resources, you really really want to build it with the platform build system, because those resource IDs can change each time you modify and rebuild the platform. If you build them separately, I can guarantee you will run in to obscure bugs where the .apk binary you are using is not compatible with the platform build it is running on.
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Dianne Hackborn
Android framework engineer
hac...@android.comNote: please don't send private questions to me, as I don't have time to provide private support, and so won't reply to such e-mails. All such questions should be posted on public forums, where I and others can see and answer them.