Java tutorial
//package com.java2s; import android.graphics.Color; public class Main { public static int getDarkerColor(int color) { int alpha = Color.alpha(color); int red = Math.round(Color.red(color) * 0.625f); int green = Math.round(Color.green(color) * 0.625f); int blue = Math.round(Color.blue(color) * 0.625f); return Color.argb(alpha, red, green, blue); } }