Help needed with Android

Today I got recruited as full time Android dev. I know the basics of the Android starting from UI, DB, AsycTask, TraceView, DDMS etc etc. But now employer asked me to polish up my knowlege on how to deal with APIs and using GPS, Camera inside the application.

Can someone point to me some resources where I can learn the basics of this?

Thanks in advance.

The AndroidFaq should be helpful.

Thanks ulf