color from hex code flutter

use hexadecimal color strings in flutter:

Color myColor = Color(0xffffeedd) 
Color myColor  = const Color.fromARGB(0xFF, 0x22, 0x77, 0xFF);
Color myColor  = const Color.fromARGB(255, 66, 165, 245);
Color myColor  = const Color.fromRGBO(66, 165, 245, 1.0);