// get rand color
public static String getRandColorCode() {
String r,g,b;
Random random = new Random();
r = Integer.toHexString(random.nextInt(256)).toUpperCase();
g = Integer.toHexString(random.nextInt(256)).toUpperCase();
b = Integer.toHexString(random.nextInt(256)).toUpperCase();
r = r.length() == 1 ? "0" + r : r ;
g = g.length() == 1 ? "0" + g : g ;
b = b.length() == 1 ? "0" + b : b ;
return r + g + b;
}