Flutter/キャスト

色と文字列

参考：https://stackoverflow.com/questions/49835146/how-to-convert-flutter-color-to-string-and-back-to-a-color

Color color = new Color(0xff443a49);
String colorString = color.toString(); // Color(0xff443a49)
String valueString = colorString.split('(0x')[1].split(')')[0]; // ff443a49
int value = int.parse(valueString, radix: 16);
Color otherColor = new Color(value);

  static String toStrByColor(Color color) {
    return color.toString().split('(0x')[1].split(')')[0];
  }
  static Color toColorByStr(String str) {
    int value = int.parse(str, radix: 16);
    return new Color(value);
  }