Using spinner as navigation

I'm trying to do the following:

I want to create several "windows" (might not be the right word) with different contents. A "window" shall be shown if its option is selected in a spinner on top of the app. (Example: Choose "Option 1" in the spinner --> "Window 1" is shown underneath, spinner still visible).

I managed to install the spinner with several options but being a beginner sign0013 am unsure what would be the best way to create those "windows" (Labels?Tabs?...?) and how to open them via the spinner.

Probably very simple, but any ideas?