MediaQuery 01

01_mediaquery.dart

import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      debugShowCheckedModeBanner: false, 
      home: MediaQueryExample01(),
    );
  }
}

class MediaQueryExample01 extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      backgroundColor: Colors.black,
      body: Container(
        width: MediaQuery.of(context).size.width / 2,
        height: MediaQuery.of(context).size.height / 2,
        color: Colors.blue,
      ),
    );
  }
}