How do you count children in a ListView Widget and then have an action happen based on that number.

Hello,

I'm new to FlutterFlow as I just started 2 weeks ago. I have a page where you can connect Bluetooth devices and they generate in a list. You can check out the FlutterFlow tutorial here if you want:

So basically what I'm trying to do is count the number of connected devices either using an app state integer variable or something similar, and then duplicate the home page by the number of connected devices that way you can scroll through your devices and control them through the app. Since I'm new to this, I don't really know where to start other than making an app state variable. How would I achieve this?