how to assign hexadecimal color code in primarySwatch in flutter?

user_13749287 0
Viewed 5214

i would like to insert an hexadecimal color code in the primarySwatch property, here is what i have tried to do :

           return MaterialApp(
             title: 'Login Demo',
             theme: ThemeData(
              // brightness: Brightness.dark,
               primarySwatch: Color(0xFF3399FF),
flutter
2 Answers

This tutorial shows a function that can build primarySwatches from a Color.

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

  for (int i = 1; i < 10; i++) {
    strengths.add(0.1 * i);
  }
  strengths.forEach((strength) {
    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);
}

Then in the theme you can do:

      primarySwatch: buildMaterialColor(Color(0xFF3399FF)),
user_111986090

You can set primarySwatch property like below.

Map<int, Color> color =
{
50:Color.fromRGBO(51, 153, 255, .1),
100:Color.fromRGBO(51, 153, 255, .2),
200:Color.fromRGBO(51, 153, 255, .3),
300:Color.fromRGBO(51, 153, 255, .4),
400:Color.fromRGBO(51, 153, 255, .5),
500:Color.fromRGBO(51, 153, 255, .6),
600:Color.fromRGBO(51, 153, 255, .7),
700:Color.fromRGBO(51, 153, 255, .8),
800:Color.fromRGBO(51, 153, 255, .9),
900:Color.fromRGBO(51, 153, 255, 1),
};
...
primarySwatch: MaterialColor(0xFF3399FF, color)
user_119864500
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