I think the issue is there is no vendor keylayout for the xbox one (i dont see it anywhere in system/usr/keylayout) i wonder if he can trick his device into thinking its an xbox 360 controller? I trick mine into thinking my ps4 controller is a ps3. Does it show up as xbox one s controller when it syncs? Android labeled mine a sony wireless controller which is incorrect in terms of keylayout. I use a third party app (sixaxis controller) to sync it and remapp it might help (requires root)