content: package com.sunfusheng.StickyHeaderListView.util;
  
  import android.content.Context;
  
  /**
   * Created by sunfusheng on 16/4/22.
   */
  public class ColorUtil {
  
  
      // 成新的颜色值
      public static int getNewColorByStartEndColor(Context context, float fraction, int startValue, int endValue) {
          return evaluate(fraction, context.getResources().getColor(startValue), context.getResources().getColor(endValue));
      }
      /**
       * 成新的颜色值
       * @param fraction 颜色取值的级别 (0.0f ~ 1.0f)
       * @param startValue 开始显示的颜色
       * @param endValue 结束显示的颜色
       * @return 返回生成新的颜色值
       */
      public static int evaluate(float fraction, int startValue, int endValue) {
          int startA = (startValue >> 24) & 0xff;
          int startR = (startValue >> 16) & 0xff;
          int startG = (startValue >> 8) & 0xff;
          int startB = startValue & 0xff;
  
          int endA = (endValue >> 24) & 0xff;
          int endR = (endValue >> 16) & 0xff;
          int endG = (endValue >> 8) & 0xff;
          int endB = endValue & 0xff;
  
          return ((startA + (int) (fraction * (endA - startA))) << 24) |
                  ((startR + (int) (fraction * (endR - startR))) << 16) |
                  ((startG + (int) (fraction * (endG - startG))) << 8) |
                  ((startB + (int) (fraction * (endB - startB))));
      }
  
  }
  