Java tutorial
//package com.java2s; import android.graphics.Color; public class Main { private static final float DARKEN_SATURATION = 1.1f; private static final float DARKEN_INTENSITY = 0.9f; public static int darkenColor(int color) { float[] hsv = new float[3]; int alpha = Color.alpha(color); Color.colorToHSV(color, hsv); hsv[1] = Math.min(hsv[1] * DARKEN_SATURATION, 1.0f); hsv[2] = hsv[2] * DARKEN_INTENSITY; int tempColor = Color.HSVToColor(hsv); return Color.argb(alpha, Color.red(tempColor), Color.green(tempColor), Color.blue(tempColor)); } }