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