There are manuals online that can help you do that. You’re not the first one looking for a solution to this issue, and there are ways to connect your guitar to your Android phone and use Plugins there. The good thing about Android OS is that it’s flexible, and anyone can do with it whatever they want. It’s the main reason, probably, why I choose Android and not iOS.
I’m not a huge guitar player myself, but I have an electric guitar my father gave me for my 16 birthdays. It’s still shiny and has beautifully decorated guitar tuning knobs. I play it occasionally when I’m in the mood.