How to ran&build project for Android without connecting device?

I have trivial problem, but I am not able to deal with it. I write game with Unity to Android. The problem is that I haven’t this device with me mostly and I would like to just build project to one file APK and send to friend, who it has. I know that it is possible, but I always have error “Couldn’t find Android device” and process stops.
I also looking for answer by Google, but everybody has problem just with connect it properly or looks for some emulators.

Could somebody tell me, what I should change in settings etc. to do it at last?

Thanx

You need to Build only and not build & run.

for that I use dropbox you add the file at a dropbox folder on your computer and you can
A) send public link to any android to download
B) download via android dropbox with a shared folder