I got Google Maps Android API v2 to work perfectly on my Android Application by downloading the library, adding it to workspace, then referencing it as a library.
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I finally do it! If you're using SupportFragmentMap I think you should turn on the google maps android v2 on the api console, because I was using the Google Maps v2 and it worked fine with FragmentMap but when I changed for SupportFragmentMap to include froyo and gingerbread compatibility it didn't run. I spend 4 stressfull hours searching, trying, coding, changing keys, libraries, updating and... I just turned on the Google Android Maps v2 and turned off the Google Maps v2 and now it's working! Thanks a lot.