Use automated web browser in mobile app

I was wondering if anyone could let me know if this can be done, and anything that could it. What I want to do from a mobile app (android or ios) is to navigate to a webpage fill out a login form and then login to that web service from a mobile app.

I was looking at selenium as something that might be able to do this, but it seems it is limited to just my machine? Am I correct in that it has to be installed on my android device, and I could not have a program that would run on a deployed app.

So that it would navigate, to the web age, fill out the form and then click th login button?

Thanks for the help in.