Android Icon Png Size. Action bar icons require a file size of 32×32 pixels at the baseline size (mdpi). And the prize for the most detailed icon style guide goes to… google!
Xxxhdpi (4x) 192 x 192 px. Since 22×22 is the smallest size the icon will be viewed at, it’s ideal to design the icon at this size first so you can ensure the design will be clear and identifiable at its smallest size. Android launcher icons can be in jpeg (jpg) format, or more commonly in the portable network graphics (png) format.
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