Density grouping of android

http://developer.android.com/guide/practices/screens_support.html

scroll down a bit and you will see this part of the documentation

" xlarge screens are at least 960dp x 720dp large screens are at least 640dp x 480dp normal screens are at least 470dp x 320dp small screens are at least 426dp x 320dp "

my question is what if the screen is s开发者_如何学Pythonmaller that 426x320, let say the screen have 240x160 which group it belongs to ? It can't be in 'small' group cause it is not at least 426x320...

than where it is ?

I find a blog of Deanne that says "small screens are at least 426dp x 320dp. (Android does not currently support screens smaller than this.)"

so the answer is the resolution can't be smaller than 426dp x 320dp.