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Flutter でデバイスの画面サイズを得る MediaQuery

Flutter で、デバイスの画面サイズを得るには MediaQuery という Widget を使います。

@override
Widget build(BuildContext context) {
  final Size size = MediaQuery.of(context).size;

  // sizeを使って何かする
  return new Container(
    width: size.width,
    ...
  );
}

※画面に表示されるようなものではないですが、こういうのも含めて「みんなWidget」です

また、前提としてコンテキストの先祖に WidgetsAppMaterialApp が存在していることが必要です。

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