我是flutter的新手，尝试在btn click上添加一个单词到列表中(该单词来自文本字段)。然后，我希望列表显示在页面上

import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
  List<String> wordList = [];

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Word List',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: Scaffold(
        appBar: AppBar(
          title: Text('Flutter Word List'),
        ),
        body: Column(
          children: [
            TextField(
              decoration: InputDecoration(
                labelText: '输入单词',
              ),
              onSubmitted: (value) {
                addWordToList(value);
              },
            ),
            ElevatedButton(
              onPressed: () {
                addWordToList();
              },
              child: Text('添加到列表'),
            ),
            Expanded(
              child: ListView.builder(
                itemCount: wordList.length,
                itemBuilder: (context, index) {
                  return ListTile(
                    title: Text(wordList[index]),
                  );
                },
              ),
            ),
          ],
        ),
      ),
    );
  }

  void addWordToList([String word]) {
    if (word != null && word.isNotEmpty) {
      wordList.add(word);
    }
  }
}