Android icons are smaller than others what's going on

============ Problem Description ============

Ashamed to say, did the Android development so long, for this basic problem actually still do not know. Today, careful observation only to find that their application of the icon than other people's small, directly to the person's icon to take over or smaller than others. Excuse me, where is this set up? My ADT is 23.

============ Solution 1============

Transparent margin large, quickly look at the PS book

============ Solution 2============

Hey, do an android also to learn PS.

============ Solution 3============

That's the directory problem you put in the folder, like xx-dpi,x-dpi to put an icon

============ Solution 4============

Fairy icon compared to half a day

Android icons are smaller than others what's going on