confirm_popup.dart

bool confirm = await showDialog<bool>(
  context: context, 
  builder: (context) {
      return AlertDialog(
        title: const Text('Are you sure?'),
        content: const Text('This action cannot be undone.'),
        actions: [
          TextButton(
            child: const Text('Cancel'),
            onPressed: (){
              Navigator.pop(context,false);
            },
          ),
          TextButton(
            child:const Text('End'),
            onPressed: (){
              Navigator.pop(context,true);
            },
          )
        ],
      );
    },) ?? false;