런처 아이콘 사이즈

Size and Format

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Launcher icons should be 32-bit PNGs with an alpha channel for transparency. The finished launcher icon dimensions corresponding to a given generalized screen density are shown in the table below.

Table 1. Summary of finished launcher icon dimensions for each generalized screen density.

	ldpi (120 dpi) (Low density screen)	mdpi (160 dpi) (Medium density screen)	hdpi (240 dpi) (High density screen)	xhdpi (320 dpi) (Extra-high density screen)
Launcher Icon Size	36 x 36 px	48 x 48 px	72 x 72 px	96 x 96 px

You can also include a few pixels of padding in launcher icons to maintain a consistent visual weight with adjacent icons. For example, a 96 x 96 pixel xhdpi launcher icon can contain a 88 x 88 pixel shape with 4 pixels on each side for padding. This padding can also be used to make room for a subtle drop shadow, which can help ensure that launcher icons are legible across on any background color.

http://developer.android.com/guide/practices/ui_guidelines/icon_design_launcher.html