FlutterでシンプルなPickerを作る。Dialogとも言う。 コピペで動くはず。 Flutter ピッカー動作確認 Flutterピッカーの仕組み flutter_pickerの最新版を追加してください。 Dart packagesflutter_picker | Flutter Packagehttps://pub.dev/packages/flutter_picker/installFlutter plugin picker. Include NumberPicker, DateTimePicker, ArrayPicker, and default linkage Picker. Provide flexible parameters to meet various needs.