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

void main() {
  return runApp(TestPage());
}

//リスト4.16
class TestPage extends StatelessWidget{
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'インジケータ',
      home: Scaffold(
        appBar: AppBar(title: Text('インジケータ')),
        body: Center(child: CircularProgressIndicator())
      )
    );
  }
}