如何将一个数字(通过单击按钮的OnPressed属性)从一个stful小部件(应用程序的第一个屏幕)传递到第二个页面的ListView.builder

class FirstScreen extends StatefulWidget {
  @override
  _FirstScreenState createState() => _FirstScreenState();
}

class _FirstScreenState extends State<FirstScreen> {
  int selectedNumber;

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('First Screen'),
      ),
      body: Center(
        child: ElevatedButton(
          onPressed: () {
            setState(() {
              selectedNumber = 42; // 设置要传递的数字
            });
            Navigator.push(
              context,
              MaterialPageRoute(
                builder: (context) => SecondScreen(selectedNumber: selectedNumber),
              ),
            );
          },
          child: Text('Go to Second Screen'),
        ),
      ),
    );
  }
}

class SecondScreen extends StatefulWidget {
  final int selectedNumber;

  SecondScreen({this.selectedNumber});

  @override
  _SecondScreenState createState() => _SecondScreenState();
}

class _SecondScreenState extends State<SecondScreen> {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Second Screen'),
      ),
      body: ListView.builder(
        itemCount: 1,
        itemBuilder: (context, index) {
          return ListTile(
            title: Text('Selected Number: ${widget.selectedNumber}'), // 使用传递的数字
          );
        },
      ),
    );
  }
}

Navigator.push(
  context,
  MaterialPageRoute(
    builder: (context) => SecondScreen(selectedNumber: selectedNumber),
  ),
);