Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
/*
 * Copyright (C) 2015 Twitter, Inc.
 *
 * 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 {
    private static final int RGB_TOTAL_COLORS = 256;

    /**
     * This method calculates a darker color provided a factor of reduction in lightness.
     *
     * @param color The original color value
     * @param factor Factor of lightness reduction, range can be between 0 - 1.0
     * @return  The calculated darker color
     */
    public static int calculateDarkerColor(final int color, final float factor) {
        final int a = Color.alpha(color);
        final int r = Color.red(color);
        final int g = Color.green(color);
        final int b = Color.blue(color);

        final int lightnessLevel = Math.round(RGB_TOTAL_COLORS * factor);

        return Color.argb(a, Math.max(r - lightnessLevel, 0), Math.max(g - lightnessLevel, 0),
                Math.max(b - lightnessLevel, 0));
    }
}