Main.java Source code

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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 {
    /**
     * This method calculates a combination of colors using an opacity of the foreground layered
     * over the background color. This allows us to optimize color calculations instead of setting
     * alpha values in the color attributes on the views directly.
     *
     * @param opacity      A value in the range of 0 to 1 that indicates the opacity desired for the
     *                     overlay color
     * @param overlayColor The foreground color that the opacity will be applied to
     * @param primaryColor The background color that the foreground color is applied to
     * @return             The combined color value
     */
    static int calculateOpacityTransform(final double opacity, final int overlayColor, final int primaryColor) {
        final int redPrimary = Color.red(primaryColor);
        final int redOverlay = Color.red(overlayColor);
        final int greenPrimary = Color.green(primaryColor);
        final int greenOverlay = Color.green(overlayColor);
        final int bluePrimary = Color.blue(primaryColor);
        final int blueOverlay = Color.blue(overlayColor);

        final int redCalculated = (int) ((1 - opacity) * redPrimary + opacity * redOverlay);
        final int greenCalculated = (int) ((1 - opacity) * greenPrimary + opacity * greenOverlay);
        final int blueCalculated = (int) ((1 - opacity) * bluePrimary + opacity * blueOverlay);

        return Color.rgb(redCalculated, greenCalculated, blueCalculated);
    }
}