hi,
I have 4+ yrs of experienced as an android developer and i can do this task for you. As you asked in your project that you want propose solution for showing ad banner as well as position of banner then i would say that you can have one best solution is web api.
For position we can have four positions, top, bottom, left and right, with the combination of this four position you can set your banners.
Please share your skype id and lets have discussion about the app.
Please let me know if you have any question or queries.
Best Regards,
PyDroid Dev