When I am building a game for android, I get this message:
No Android device found! Make sure USB debugging has been enabled. Check your device. I
For all those who spent hours trying to find out what's wrong and none of above answers helped. Please also check if cable you are using is not cheap "charging only and no data transfer type".
I've picked up a random cable from my cable box. After trying everything and loosing x amount of hair and time, I've decided to check a different cable, and voila everything worked immediately.