如何在Flutter中删除交互式选择文本字段？

import 'package:flutter/material.dart';

class MyForm extends StatefulWidget {
  @override
  _MyFormState createState() => _MyFormState();
}

class _MyFormState extends State<MyForm> {
  String selectedValue;

  void handleDropdownChange(String value) {
    setState(() {
      selectedValue = value;
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('My Form'),
      ),
      body: Padding(
        padding: EdgeInsets.all(16.0),
        child: Column(
          children: [
            DropdownButtonFormField(
              value: selectedValue,
              items: [
                DropdownMenuItem(
                  value: 'Option 1',
                  child: Text('Option 1'),
                ),
                DropdownMenuItem(
                  value: 'Option 2',
                  child: Text('Option 2'),
                ),
                DropdownMenuItem(
                  value: 'Option 3',
                  child: Text('Option 3'),
                ),
              ],
              onChanged: handleDropdownChange,
            ),
            // Other UI elements based on selectedValue
          ],
        ),
      ),
    );
  }
}

void main() {
  runApp(MaterialApp(
    home: MyForm(),
  ));
}