How to darken a given color (int)

Question

I have a function that takes a given color and I would like it to darken the color (reduce its brightness by 20% or so). I can't figure out how to do this given just a color (int). What is the proper approach?

public static int returnDarkerColor(int color){     int darkerColor = ....      return darkerColor; } 

Answer 1

A more Android way of doing it:

    public static int manipulateColor(int color, float factor) {         int a = Color.alpha(color);         int r = Math.round(Color.red(color) * factor);         int g = Math.round(Color.green(color) * factor);         int b = Math.round(Color.blue(color) * factor);         return Color.argb(a,                 Math.min(r,255),                 Math.min(g,255),                 Math.min(b,255));     } 

You will want to use a factor less than 1.0f to darken. try 0.8f.