Android Launcher Icon "suggests" a border
Looking at the Android Asset Studio Launcher Icon Generator, the launcher icons always end up with a transparent border of at least 2dp. Same goes the App Icon Template. But Googles Design Guide does not mention any best practice or requirements for such a border.
My question: Is there any good reason to follow this suggestion instead of using the available space as you please?
I found the following, hope this helps:
Android Icon Margins
â€¦ it was recommend that the icon included a margin around one twelfth of the total size between the edge of the icon and the image it contained. For example the medium density icon is 48Ã—48 pixels, one twelfth of this is 4, giving a margin of 4 pixels around the icon. This means the area available for the image is 40Ã—40 (48 minus the margin of 4 pixels on each side).
However, the bigger screens on todayâ€™s devices gives more room for the icons so a smaller margin can be used, for example one eighteenth of the icon size. The margin allows for spaces between the icons on a screen and to allow for any drop shadows or parts of the image that stick out a little.