Android Open Source - Material Color Util

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License

The source code is released under:

Apache License

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Java Source Code

package com.rey.material.util;
/* w  w w  .  j a v  a  2  s  .  co  m*/
import android.graphics.Color;

public class ColorUtil {

  private static int getMiddleValue(int prev, int next, float factor){
    return Math.round(prev + (next - prev) * factor);
  }
  
  public static int getMiddleColor(int prevColor, int curColor, float factor){    
    if(prevColor == curColor)
      return curColor;
    
    if(factor == 0f)
      return prevColor;
    else if(factor == 1f)
      return curColor;
    
    int a = getMiddleValue(Color.alpha(prevColor), Color.alpha(curColor), factor);
    int r = getMiddleValue(Color.red(prevColor), Color.red(curColor), factor);
    int g = getMiddleValue(Color.green(prevColor), Color.green(curColor), factor);
    int b = getMiddleValue(Color.blue(prevColor), Color.blue(curColor), factor);
    
    return Color.argb(a, r, g, b);
  }
  
  public static int getColor(int baseColor, float alphaPercent){        
    int alpha = Math.round(Color.alpha(baseColor) * alphaPercent);
    
    return (baseColor & 0x00FFFFFF) | (alpha << 24);
  }
}

Java Source Code List