how to give the #color code in flutter code example

Example 1: how to use hexadecimal color in flutter

Color myColor = Color(0xff123456) 

// where 123456 is your hex color code and
// 0xff is the opacity value and can be changed.

Example 2: color from hex code flutter

Color c = const Color(0xFF42A5F5);
Color c = const Color.fromARGB(0xFF, 0x42, 0xA5, 0xF5);
Color c = const Color.fromARGB(255, 66, 165, 245);
Color c = const Color.fromRGBO(66, 165, 245, 1.0);