Java tutorial
//package com.java2s; /* * Copyright (C) 2016 ?linson Santos Xavier <isoron@gmail.com> * * This file is part of Loop Habit Tracker. * * Loop Habit Tracker is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by the * Free Software Foundation, either version 3 of the License, or (at your * option) any later version. * * Loop Habit Tracker is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for * more details. * * You should have received a copy of the GNU General Public License along * with this program. If not, see <http://www.gnu.org/licenses/>. */ import android.graphics.Color; public class Main { public static int setAlpha(int color, float newAlpha) { int intAlpha = (int) (newAlpha * 255); return Color.argb(intAlpha, Color.red(color), Color.green(color), Color.blue(color)); } }