有的:
To help you target some of your designs for different types of devices, here are some
numbers for typical screen widths:
320dp: a typical phone screen (240x320 ldpi, 320x480 mdpi, 480x800 hdpi, etc).
480dp: a tweener tablet like the Streak (480x800 mdpi).
600dp: a 7” tablet (600x1024 mdpi).
720dp: a 10” tablet (720x1280 mdpi, 800x1280 mdpi, etc).
所以1280*720 就用720dp的.
你可以参考google的文档,如下:
http://developer.android.com/guide/practices/screens_support.html
简单的公式是:
dp = px * ( 160/ dpi )
