What Should Be The Default Launcher Icon Size
Solution 1:
I don't think you need to supply an image in the drawable/ directory if you have populated drawable-ldpi/drawable-mdpi/ and drawable-hdpi/ with launcher icons.
Solution 2:
Android icon sizes
ldpi :36x36px(120dpi/47dpcm)mdpi :48x48px(160dpi/62dpcm)hdpi :72x72px(240dpi/94dpcm)xhdpi :96x96px(320dpi/126dpcm)xxhdpi :144x144px(480dpi/189dpcm)xxxhdpi :192x192px(640dpi/252dpcm)dip :48x48dip(dip=dp)mm :76mm(dependsontherealdevicedpi)iPhone icon sizes (dpi is a bit different on iPads)
non-retina :57x57px(163dpi/64dpcm)retina :114x114px(326dpi/128dpcm)mm :89mmSolution 3:
The Android icon guidelines say that the baseline should be assumed to be mdpi, so if you're using the default drawable directory, images should be designed according to those guidelines (48x48 for launcher icons). According to the documentation:
The system assumes that default resources are designed for the baseline screen size and density, which is a normal screen size and a medium density. (from http://developer.android.com/guide/practices/screens_support.html)
There's a bit of information there regarding when images from the default drawable directory are used too, but nothing specific.
Solution 4:
Maybe the following link will help you
http://developer.android.com/guide/practices/ui_guidelines/icon_design_launcher.html#size5
According to Icon Design launcher:
Launcher icon dimensions for high-density (hdpi) screens:
Full Asset: 72 x 72 px
Icon: 60 x 60 px
Square Icon: 56 x 56 px
Launcher icon dimensions for medium-density (mdpi) screens:
Full Asset: 48 x 48 px
Icon: 40 x 40 px
Square Icon: 38 x 38 px
Launcher icon dimensions for low-density (ldpi) screens:
Full Asset: 36 x 36 px
Icon: 30 x 30 px
Square Icon: 28 x 28 px
Solution 5:
According to http://developer.android.com/design/style/iconography.html, the default launcher icon size should be 48 x 48 pixels.
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