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最後にFlutterのオンライン講座のリンクも載せていますので、ぜひそちらもご覧ください。

iniState内で5秒止める処理がしたいとき,このように記述することはできません。

main.dart
@override
void initState() async {
  super.initState();

  await Future.delayed(Duration(seconds: 5));
}

このようにすると実行できます。

main.dart
@override
void initState() {
 super.initState();
 
 Future(() async {
   await Future.delayed(Duration(seconds: 5));
 });
}

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