Map<int, Color> blue = const {50 : const Color(0xFFE3F2FD), 100 : const Color(0xFFBBDEFB), 200 : const Color(0xFF90CAF9), 300 : const Color(0xFF64B5F6), 400 : const Color(0xFF42A5F5), 500 : const Color(0xFF2196F3), 600 : const Color(0xFF1E88E5), 700 : const Color(0xFF1976D2), 800 : const Color(0xFF1565C0), 900 : const Color(0xFF0D47A1)}

The blue primary swatch.

 new Icon(
   icon: Icons.widgets,
   color: Colors.blue[400],
 ),

See also:

  • blueAccent, the corresponding accent colors.
  • of, which allows you to select colors from the current theme rather than hard-coding colors in your build methods.