第一个Hello页面

/*
 * @Desc   : 打印Hello，Flutter
 * @Time   : 2020/11/28 00:26
 * @Author : CarpLi
 */
import 'package:flutter/material.dart';

// 1、主函数，渲染app页面
void main() => runApp(RootApp());


class RootApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: "Flutter App",
      // 2、默认进入的主页
      home: Content(),
    );
  }
}

class Content extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    // 脚手架，页面布局
    return Scaffold(
      // 页面导航条
      appBar: AppBar(
        title: Text(
          "${DateTime.now().year}"
        ),
        shadowColor: Colors.red,
        backgroundColor: Colors.green,
      ),
      body: Center(
        child: Text(
          "你好，Flutter！",
          style: TextStyle(
            fontSize: 40,
            color: Colors.red
          ),
        ),
      ),
    );
  }
}