我的第一个flutter程序

环境搭建好了之后，终于可以开始flutter的学习，废话少说先开始‘Hello World’。

创建好flutter项目之后，打开设备模拟器

打开之后

准备ok，开始编码

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mian.dart

// Material Design设计风格的基础包
import 'package:flutter/material.dart';

// 入口程序
void main() => runApp(MyApp());

// main fun
class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    return MaterialApp (
      title: 'title',
      theme: new ThemeData(  //创建主题
        brightness: Brightness.light,  //整体亮度
        primaryColor: Colors.lightGreen[],  //主要部分的背景色
        accentColor: Colors.orange, // 前景色
      ),
      home: Scaffold(
        appBar: AppBar(
          title: Text(
            'おはようございます',
            style: new TextStyle( // 样式
                color: Colors.purpleAccent, //color
                fontSize:   // size
            ),
          ),
        ),
        body: Center(
          child: Text(
            '今日はいい天気だよね',
            style: new TextStyle(
                color: Colors.orange,
                fontSize:
            ),
          ),
        ),
      ),
    );
  }
}

点击运行，运行成功之后

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// Material Design设计风格的基础包
import 'package:flutter/material.dart';
import 'package:flutter/foundation.dart';
// 入口程序
void main() => runApp(MyApp());

// main fun
class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    final appName = 'TOKYO-HOT';
    return new MaterialApp(
      title: appName,
      theme: new ThemeData(
        brightness: Brightness.light,
        primaryColor: Colors.purpleAccent,
        accentColor: Colors.red,
      ),
      home: new MyHomePage(
        title: appName
      )
    );
  }
}

class MyHomePage extends StatelessWidget {

  final String title;
  MyHomePage({Key key, @required this.title}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    // TODO: implement build

    return new Scaffold(
      appBar: new AppBar(
        title: new Text(title),
      ),
      body: new Center(
        child: new Container(
          // 获取主题的accentColor
          color: Theme.of(context).accentColor,
          child: new Text(
            "I'm red",
//          style: Theme.of(context).textTheme.title,
            style: new TextStyle(
                color:  Colors.white
            )
          ),
        )
        ),
      floatingActionButton: new Theme(
          data: Theme.of(context).copyWith(accentColor: Colors.grey),
          child: new FloatingActionButton(
            onPressed: printa,
            child: new Icon(Icons.computer),
          )

      ),

    );
  }
}

void printa() {
  print();
  print('xxxxx');
}