What should be the default launcher icon size

Question

I refer to the documentation at http://developer.android.com/guide/practices/ui_guidelines/icon_design.html#icon-sets

Hence, I plan to have the following directory struc

Answer 1

Android icon sizes

ldpi : 36x36px (120 dpi / 47 dpcm)
mdpi : 48x48px (160 dpi / 62 dpcm)
hdpi : 72x72px (240 dpi / 94 dpcm)
xhdpi : 96x96px (320 dpi / 126 dpcm)
xxhdpi : 144x144px (480 dpi / 189 dpcm)
xxxhdpi : 192x192px (640 dpi / 252 dpcm)

dip : 48x48dip (dip = dp)

mm : 76 mm (depends on the real device dpi)

iPhone icon sizes (dpi is a bit different on iPads)

non-retina : 57x57px (163 dpi / 64 dpcm)
retina : 114x114px (326 dpi / 128 dpcm)

mm : 89 mm