Java tutorial
//package com.java2s; //License from project: Apache License import android.graphics.Color; public class Main { public static int makePressColor(int color, int alpha) { int r = (color >> 16) & 0xFF; int g = (color >> 8) & 0xFF; int b = (color >> 0) & 0xFF; r = (r - 30 < 0) ? 0 : r - 30; g = (g - 30 < 0) ? 0 : g - 30; b = (b - 30 < 0) ? 0 : b - 30; return Color.argb(alpha, r, g, b); } }