画面遷移し、戻ってきた時に戻り値を受け取る:
final result = await Navigator.of(context).push(
MyRoute<dynamic>(...)
);
print(result); // => "done!"
結果とともに前の画面に戻る:
Navigator.pop(context, "done!");
Dropdown Menu なんかもこの仕組みで値を返している。
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