Title should say all, but here's some network topology:
Laptop(s), desktop(s) <-wlan/lan-> router <-wifi-> android <-internet->
So I'd walk into the reach of my wifi and my android would connect to the wlan automatically and voila, internet for the rest of the network.
I think this is a good approach https://help.ubuntu.com/community/Internet/ConnectionSharing and I'll probably figure the rest out myself before long, but if someone who knows what they are talking about could create a better guide or even an app for android for this, it would be much appreciated.
As for the use of this. e.g. range, network resilience (when used in mesh networking).
Thank you
