Java tutorial
//package com.java2s; import android.graphics.Color; public class Main { /** * Get the value of color with specified alpha. * * @param color * @param alpha between 0 to 255. * @return Return the color with specified alpha. */ public static int getColorAtAlpha(int color, int alpha) { if (alpha < 0 || alpha > 255) { throw new IllegalArgumentException("The alpha should be 0 - 255."); } return Color.argb(alpha, Color.red(color), Color.green(color), Color.blue(color)); } }