dpi - Screen sizes of android design in pixels? -

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as found in android documentation site, there 4 general sizes android devices screens. found measurements unit in dp. : 

xlarge screens @ least 960dp x 720dp large screens @ least 640dp x 480dp normal screens @ least 470dp x 320dp small screens @ least 426dp x 320dp

how on photoshop, how sizes in pixels ? need have 4 design ldpi, mdpi, hdpi , xhdpi ? need have 16 versions of design. ?

yes have 4 designs :

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

i.e :

if have 96 x 96 image in xhdpi then, need 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 )

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