How Can I Hack A Secured Wifi Network With My Android Phone?
Tell your friend to reset his router. You asked another question too. If your friend forgot his password then tell him to reset the router. It takes two minutes. There's a small button on the router, use a pen and hold down on it. As for the app, androids run on java, code your own. Java apps are shitty anyway. Look into aircrack. See how it works and code a java app like that. No one bothers hacking wifi. It's dumb, and kinda pointless.