Flutter 十六进制、Color、MaterialColor类型互转

• 十六进制颜色转Color类型

class HexColor extends Color {
  static int _getColorFromHex(String hexColor) {
    hexColor = hexColor.toUpperCase().replaceAll("#", "");
    if (hexColor.length == 6) {
      hexColor = "FF$hexColor";
    }
    return int.parse(hexColor, radix: 16);
  }

  HexColor([String hexColor = '#ededed']) : super(_getColorFromHex(hexColor));
}

• Color转MaterialColor类型

static MaterialColor createMaterialColor(Color color) {
    List strengths = [.05];
    Map swatch = {};
    final int r = color.red, g = color.green, b = color.blue;

    for (int i = 1; i < 10; i++) {
      strengths.add(0.1 * i);
    }
    for (var strength in strengths) {
      final double ds = 0.5 - strength;
      swatch[(strength * 1000).round()] = Color.fromRGBO(
        r + ((ds < 0 ? r : (255 - r)) * ds).round(),
        g + ((ds < 0 ? g : (255 - g)) * ds).round(),
        b + ((ds < 0 ? b : (255 - b)) * ds).round(),
        1,
      );
    }
    return MaterialColor(color.value, swatch);
  }