How to access a List in another class? [Flutter]

I have a FAB which creates a new Card when using onPressed. The List is created using this code : List<Widget> cardList = new List.generate(_count, (int i) => new createCard());. Is it possible to access this list in another class?

main.dart:

import 'package:flutter/material.dart';
import 'package:todo_list/starting_screen.dart';

void main(){
  runApp(MaterialApp(
    debugShowCheckedModeBanner: false,
    theme: ThemeData(brightness: Brightness.dark, backgroundColor: Colors.black87),
    home: Starting_screen()
  ));
}

starting_screen.dart:

import 'all_classes.dart';
import 'package:flutter/services.dart';
import 'package:flutter/material.dart';

class Starting_screen extends StatefulWidget {
  @override
  _Starting_screenState createState() => _Starting_screenState();
}

class _Starting_screenState extends State<Starting_screen> {
  int _count = 0;

  @override
  Widget build(BuildContext context) {

      List<Widget> cardList = new List();
      SystemChrome.setEnabledSystemUIOverlays([]);

       void functionToGenerateTheList(){
        cardList = new List.generate(_count, (int i) => new createCard());
      }

        return Scaffold(
            floatingActionButton: FloatingActionButton(
              onPressed: () async {
                setState(() {
                  _count += 1;
                });
              },
              heroTag: "btn2",
              child: Icon(Icons.add, color: Color(whitecolor),), // this is just a custom color
              backgroundColor: Color(redcolor),), // this is just a custom color
            body: CustomScrollView(
                slivers: <Widget>[
                  SliverAppBar(
                    pinned: true,
                    flexibleSpace: FlexibleSpaceBar(
                    ),
                    actions: <Widget>[
                      Expanded(
                        child: Padding(
                          padding: const EdgeInsets.only(top: 20, right: 10),
                          child: whitefontstyle(text: "Remaining tasks for today - ${cardList.length}", size: 20,), // this is just a custom textstyle
                        ),
                      ),
                    ],
                  ),
                  SliverGrid(
                      gridDelegate: SliverGridDelegateWithFixedCrossAxisCount(
                          crossAxisCount: 2
                      ),
                      delegate: new SliverChildBuilderDelegate((context,
                          index) {
                        return cardList[index]; // this is where the cards are displayed in a list
                      },
                          childCount: cardList.length
                      )
                  ),
                ]
            )
        );
      }
    }

all_classes.dart:

import 'package:flutter/material.dart';

const redcolor = 0xFFF0002F;
const whitecolor = 0xFFFFFFFF;
const blackcolor = 0xFF000000;


class createCard extends StatefulWidget {
//  createCard();
  @override
  _createCardState createState() => _createCardState();
}

class _createCardState extends State<createCard> {
  @override
  Widget build(BuildContext context) {
    return Card(
      child: ListTile(
        title: Text("project 1"),
        trailing: new IconButton(
          key: Key(UniqueKey().toString()),
          onPressed: (){
            setState(() {

            }
            );
          },
          icon: Icon(Icons.close),
          color: Color(redcolor),
          highlightColor: Color(whitecolor),
        ),
//                      subtitle: whitefontstylemont(text: "project 1", size: 20,)) //this is just a custom TextStyle
      ),
    );
  }
}

class whitefontstyle extends StatelessWidget{
  Color color = Color(whitecolor);
  String text = "";
  double size;
  whitefontstyle({@required this.text, this.size,});

  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    return Text("$text", style: TextStyle(height: 1.2, fontSize: size, color: color),);
  }
}

EDIT: I want to essentially implement a delete Card functionality to this app. But i need to access the list cardList in the createCard class under the file "all_classes.dart"

You can declare the list being a member of the class Card.

So the Card (or the class where you are generating the list) class will be as follow:

public class Card {
    private List<Widget> cardList;

    public void functionToGenerateTheList(){
        cardList = new List.generate(_count, (int i) => new createCard());
    }

    public List<Widget> getCardList(){
        return cardList;
    }
}

So the idea is to make cardList a private member of the class (will name it X) where you are creating it, then create a public getter method to be able to retrieve it from whatever class having an instance of the class X (having cardList as member)

Note: this code snippet is in java