How to access Flutter Back button functionality?
I think you can make use of WillPopScope widget. You can pass a callback function which will be called when the view is about pop. Just do whatever tasks to be completed before pop and then return true.
Example:
Future<bool> _willPopCallback() async { // await showDialog or Show add banners or whatever // then return true; // return true if the route to be popped}//then pass the callback to WillPopScopenew WillPopScope(child: new Scaffold(), onWillPop: _willPopCallback)Hope that helps!