Menus with overlays

[vegeta1in]

Hi all,

I am developing an application in which the content changes according to menu options located on top and bottom of screen(see picture attached).
I want to keep these menu options common through all the screens, but only want to change the content in the middle of these pages. Can you let me know the best possible way to do this?

I tried stack widgets but we have many screens with significant code associated with them, which might cause maintenance issues with a large chunk of code in a single file.

Any other suggestions?

Thanks.