flutter hello worldひな形

flutterが最初に作ってくれるプロジェクトだと大げさなのでこれくらいがいい

StatelessWidget

import 'package:flutter/material.dart';

void main() => runApp(HelloApp());

class HelloApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Hello',
      home: Scaffold(
        appBar: AppBar(title: Text("hello")),
        body: Center(
          child: Text("hello"),
        ),
      )
    );
  }
}

StatefulWidget

import 'package:flutter/material.dart';

void main() => runApp(
    MaterialApp(
      title: "Hello",
      home: MainScreen(),
    )
);

//Full screen
class MainScreen extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text("Hello"),
      ),
      body: Content(),
    );
  }
}

class Content extends StatefulWidget {
  Content({Key key}) : super(key: key);

  @override
  _ContentState createState() => new _ContentState();
}

class _ContentState extends State<Content> {

  @override
  Widget build(BuildContext context) {
    return Container();
  }
}

以上です