【 Flutter 】Flutter を 基礎 から 学習 ( ウィジェット編 ) part24 Single-child layout widgets

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

void main() {
  runApp(new MaterialApp(home: new MyApp()));
}

var ok = false;

class MyApp extends StatefulWidget {
  @override
  State<StatefulWidget> createState() {
    return _State();
  }
}

class _State extends State<MyApp> {
  @override
  Widget build(BuildContext context) {
    var mediaQuery = MediaQuery.of(context);

    return MaterialApp(
      home: Scaffold(
          appBar: AppBar(
            title: Text('テスト中です。'),
          ),
          body: Center(
            child: Container(
              decoration: BoxDecoration(
                  color: Colors.green,
                  border: Border.all(width: 10.0, color: Colors.red)),
              height: 100,
              width: 200,
            ),
          )),
    );
  }
}