Java tutorial
//package com.java2s; /* * Copyright (C) 2015 Jorge Ruesga * * 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 { public static int getContrastColor(int color) { float[] hsv = new float[3]; Color.RGBToHSV(Color.red(color), Color.green(color), Color.blue(color), hsv); if (hsv[2] < 0.5) { hsv[2] = 0.7f; } else { hsv[2] = 0.3f; } hsv[1] = hsv[1] * 0.2f; return Color.HSVToColor(hsv); } }