自定义实现TabLayout，类似于今日头条的可滑动tab，带三角下标，可绑定ViewPager进行联动
在开发中，我们常常需要ViewPager结合Fragment一起使用，如下图：
我们可以使用Design support library库的TabLayout去实现，但是TabLayout只能用横线指示器，如果想要其他指示器，比如三角下标，该控件就不能用了。
我们可以找网上成熟的轮子进行修改，比如：PagerSlidingTabStrip
楼主这里在项目中需要用到带三角下标的TabLayout，亲身研究了一番，结合鸿洋大神的博客：Android 教你打造炫酷的ViewPagerIndicator 不仅仅是高仿MIUI
实现了一个类似于今日头条的可滑动tab，带三角下标，可绑定ViewPager进行联动。
效果图如下
控件继承HorizontalScrollView，便于处理水平滚动。
三角下标用canvas绘制。
控件关键点在于处理好tab容器本身滑动的距离和三角下标滑动的距离。
详细见我的CSDN博客： 自定义实现带三角下标的TabLayout
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