I'm using android studio on a 4k screen and my problem is all icons and fonts are small.
I fixing fonts problem by changing their size to 36 but still icons are really tiny.
I've just seen from this link that there is a high dpi support in intellij idea since 13.1:
Support Windows/Linux HiDPI devices via -Dis.hidpi=true
I added this line -Dis.hidpi=true to studio64.vmoptions and studio.vmoptions files but nothing happen. Also there is a trick for Windows by "Disable display scaling on high DPI settings" but i'm using Linux (Fedora 22). Any ideas?