Screen sizes of android design in pixels?

Question

As I found in android documentation site, the there are 4 general sizes for android devices screens. but I found the measurements unit in dp. like this :

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

How to do that on photoshop, how to get the sizes in pixels ? Do I need to have 4 design ldpi, mdpi, hdpi and xhdpi ? do I need to have 16 versions of the design. ?

Answer 1

yes you have 4 designs like :

xhdpi = 100% image
hdpi = 75% image of xhdpi image
mdpi = 50% image of xhdpi image
ldpi = 50% image of hdpi image

i.e :

if you have 96 x 96 image in xhdpi then, you need to put

72 x 72 in hdpi folder - ( 75 % of xhdpi )
48 x 48 in mdpi folder - ( 50 % of xhdpi )
36 x 36 in ldpi folder - ( 50 % of hdpi )