如何在Flutter中获取TextField中的DropDown

dependencies:
  flutter:
    sdk: flutter
  cupertino_icons: ^1.0.2
  flutter_dropdown: ^0.4.0

import 'package:flutter/material.dart';
import 'package:flutter_dropdown/flutter_dropdown.dart';

class MyPage extends StatefulWidget {
  @override
  _MyPageState createState() => _MyPageState();
}

class _MyPageState extends State<MyPage> {
  String selectedValue = '';

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('TextField with DropDown'),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            TextField(
              decoration: InputDecoration(
                labelText: 'Enter text',
              ),
            ),
            SizedBox(height: 20),
            DropDown<String>(
              items: ['Option 1', 'Option 2', 'Option 3'],
              hint: Text('Select an option'),
              onChanged: (value) {
                setState(() {
                  selectedValue = value;
                });
              },
            ),
            SizedBox(height: 20),
            Text('Selected value: $selectedValue'),
          ],
        ),
      ),
    );
  }
}

class _MyPageState extends State<MyPage> {
  TextEditingController textFieldController = TextEditingController();

  @override
  void dispose() {
    textFieldController.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      // ...
      body: Center(
        child: Column(
          // ...
          children: [
            TextField(
              controller: textFieldController,
              decoration: InputDecoration(
                labelText: 'Enter text',
              ),
            ),
            // ...
          ],
        ),
      ),
    );
  }
}