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So here I come up with two sketch templates for Android App, using the Samsung Nexus S and Samsung Galaxy Nexus as the sample devices, and put them on an A4-sized PDF with almost real-life size so designers can sketch the app with the size as close as the real device (donít blame me if there is one or two pixels off! /jk/).
Android app designer, go create some awesome apps with the GUI Design Kit and GUI Sketching Kit!