如何根据flutter中的下拉列表添加文本字段值

import 'package:flutter/material.dart';

class MyDropdown extends StatefulWidget {
  @override
  _MyDropdownState createState() => _MyDropdownState();
}

class _MyDropdownState extends State<MyDropdown> {
  String selectedValue = '';

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Dropdown Example'),
      ),
      body: Center(
        child: DropdownButton<String>(
          value: selectedValue,
          items: [
            DropdownMenuItem<String>(
              value: 'Option 1',
              child: Text('Option 1'),
            ),
            DropdownMenuItem<String>(
              value: 'Option 2',
              child: Text('Option 2'),
            ),
            DropdownMenuItem<String>(
              value: 'Option 3',
              child: Text('Option 3'),
            ),
          ],
          onChanged: (value) {
            setState(() {
              selectedValue = value;
              // 在这里根据选项的值添加文本字段值
              // 例如，可以将选中的值添加到文本字段中
              // textController.text = value;
            });
          },
        ),
      ),
    );
  }
}

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: MyDropdown(),
    );
  }
}