I get the same problem.
Two actions, first:
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1.Right click on the project and go to “Properties”
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2.Select “Java Build Path” on the left
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3.Open “Source” tab
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4.Click “Add Folder…” and check “gen” and “src”
second: (because the previous action asked me to remove something… I do not remember what it was…)
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1. Right click on the project and go to “Properties”
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2. Select “Java Build Path” on the left
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3. Open Libraries “tab”
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4. Add an external JAR. Add the Google API that is in your android directory (android-sdk\platforms\android-yourversion
And now it works for me!