How do I get the color code for my Flutter?

withAlpha method Null safety Returns a new color that matches this color with the alpha channel replaced with a (which ranges from 0 to 255) . Out of range values will have unexpected effects.

We need to prefix 0xff at hex color code.

To turn any color to material, You just follow below, Especially, when we try to give a primary swatch color, It only accepts the material color code. Now, Just create a variable for your custom color and specify your values in it for 50 to 900 for Luminance purpose. Map<int, Color> color ={50:Color .

In flutter, color is defined using a Color class. The Flutter color class accepts an immutable 32-bit color value in ARGB format .