Java tutorial
//package com.java2s; /******************************************************************************* * Copyright 2015 NEGU Soft * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. ******************************************************************************/ import android.graphics.Color; public class Main { /** Modify the colors translucency by alpha [0..1] with respect to the original color alpha. */ public static int applyColorAlpha(int color, float alpha) { final int originalAlpha = Color.alpha(color); // Return the color, multiplying the original alpha by the disabled value return (color & 0x00ffffff) | (Math.round(originalAlpha * alpha) << 24); } }