I tried it on my android, it works, although it either has lag or connection problems but it does make inputs and sync no problem. So i'm kinda happy, if the switch game pad also works with android, i'll maybe buy one when the price goes down.
I've noticed that the Joy-Con controllers have an odd axis mapping when used on a PC. The thumbstick is mapped to axes 4 and 5, and it acts like a D-pad; the axes only show centered or extreme positions. I suspect there's some HID quirks that need to be enabled for analog readout as well as motion detection, not to mention NFC and the IR camera on the Joy-Con R.