写自己第一个页面

有一点命名规则：
文件名用小写+_线。
类名用骆驼名字
私类或方法用_开头。

rand_page.dart 文件：

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

class RandPage extends StatefulWidget {
  const RandPage({Key? key}) : super(key: key);
  @override
  State<RandPage> createState() => _RandPageState();
}

class _RandPageState extends State<RandPage> {
  final _suggestions = <WordPair>[];
  final _biggerFont = const TextStyle(fontSize: 18.0);

  Widget _buildSuggestions() {
    return ListView.builder(
        padding: const EdgeInsets.all(16.0),
        itemBuilder: /*1*/ (context, i) {
          if (i.isOdd) return const Divider(); /*2*/

          final index = i ~/ 2; /*3*/
          if (index >= _suggestions.length) {
            _suggestions.addAll(generateWordPairs().take(10)); /*4*/
          }
          return _buildRow(_suggestions[index]);
        });
  }

  Widget _buildRow(WordPair pair) {
    return ListTile(
      title: Text(
        pair.asPascalCase,
        style: _biggerFont,
      ),
    );
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('Startup Name Generator'),
      ),
      body: _buildSuggestions(),
    );
  }
  // #docregion RWS-class-only
}

main.dart 文件：

import 'package:flutter/material.dart';
import 'package:flutter_application_1/rand_page.dart';

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

class MyApp extends StatelessWidget {
  const MyApp({Key? key}) : super(key: key);

  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return const MaterialApp(
      title: 'Startup Name Generator',
      home: RandPage(),
    );
  }
}