From your Android developer experience, what emulator screen sizes are you using?
Is there a couple that usually catches most of the questions on the size of the user interface, or do you test your application in every size and density?
During coding, try at least one from each table: http://developer.android.com/guide/practices/screens_support.html#testing . After most of the work is done, I suggest trying every combination that you find in real devices that you plan to deploy.
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