Calculate the resulting alpha from the original color and the relative alpha. - Android Graphics

Android examples for Graphics:Color Alpha

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Description

Calculate the resulting alpha from the original color and the relative alpha.

Demo Code

/*******************************************************************************
 * Copyright 2015 NEGU Soft/*from w w  w  .j a  v  a 2 s .c om*/
 * 
 * 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.
 ******************************************************************************/
//package com.java2s;

import android.graphics.Color;

public class Main {
    /** Calculate the resulting alpha from the original color and the relative alpha. */
    public static int calculateAlpha(int alpha, int originalColor) {
        int originalAlpha = Color.alpha(originalColor);
        return originalAlpha * alpha / 255;
    }
}

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