在颤动中制作CheckBoxListTile的DropDownButton

import 'package:flutter/material.dart';

class MyCheckboxListTileDropdownButton extends StatefulWidget {
  @override
  _MyCheckboxListTileDropdownButtonState createState() =>
      _MyCheckboxListTileDropdownButtonState();
}

class _MyCheckboxListTileDropdownButtonState
    extends State<MyCheckboxListTileDropdownButton> {
  List<bool> _selectedOptions = List.generate(3, (index) => false);

  @override
  Widget build(BuildContext context) {
    return Container(
      child: Column(
        children: [
          CheckboxListTile(
            title: Text('Option 1'),
            value: _selectedOptions[0],
            onChanged: (value) {
              setState(() {
                _selectedOptions[0] = value;
              });
            },
          ),
          CheckboxListTile(
            title: Text('Option 2'),
            value: _selectedOptions[1],
            onChanged: (value) {
              setState(() {
                _selectedOptions[1] = value;
              });
            },
          ),
          CheckboxListTile(
            title: Text('Option 3'),
            value: _selectedOptions[2],
            onChanged: (value) {
              setState(() {
                _selectedOptions[2] = value;
              });
            },
          ),
          SizedBox(height: 20),
          DropdownButton(
            value: _selectedOptions.indexOf(true),
            items: [
              DropdownMenuItem(
                value: 0,
                child: Text('Option 1'),
              ),
              DropdownMenuItem(
                value: 1,
                child: Text('Option 2'),
              ),
              DropdownMenuItem(
                value: 2,
                child: Text('Option 3'),
              ),
            ],
            onChanged: (value) {
              setState(() {
                _selectedOptions = List.generate(3, (index) => false);
                _selectedOptions[value] = true;
              });
            },
          ),
        ],
      ),
    );
  }
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: Text('CheckboxListTile DropdownButton'),
        ),
        body: Center(
          child: MyCheckboxListTileDropdownButton(),
        ),
      ),
    );
  }
}