这应该行得通：

String s = "0xffdddddd";
Container(color: Color(int.parse(s)))

这将给予你十六进制颜色字符串

String color = "Color(0XFFDDDDDD)";
 String hex = color.substring(0, color.length - 1);
 hex = hex.substring(6, hex.length);

将其解析为颜色：Color(int.parse(hex));
理想情况下，您的十六进制颜色也应该保存为一个纯十六进制颜色在数据库中，这样您就不必格式化字符串不必要的。
顺便说一句，如果解析不工作，试试这个扩展：

extension HexColor on Color {
  /// String is in the format "aabbcc" or "ffaabbcc" with an optional leading "#".
  static Color fromHex(String hexString) {
    final buffer = StringBuffer();
    if (hexString.length == 6 || hexString.length == 7) buffer.write('ff');
    buffer.write(hexString.replaceFirst('#', ''));
    return Color(int.parse(buffer.toString(), radix: 16));
  }

  /// Prefixes a hash sign if [leadingHashSign] is set to `true` (default is `true`).
  String toHex({bool leadingHashSign = true}) => '${leadingHashSign ? '#' : ''}'
      '${alpha.toRadixString(16).padLeft(2, '0')}'
      '${red.toRadixString(16).padLeft(2, '0')}'
      '${green.toRadixString(16).padLeft(2, '0')}'
      '${blue.toRadixString(16).padLeft(2, '0')}';
}