小票形状的CardView，可以修改阴影颜色
类似小票效果的卡片列表，并且可以修改阴影颜色
可以直接引用CardView
CardView cardView=new CardView(context);
//修改CardView的主题颜色
cardView.changeTheme(0xff01a3a1);
用paint.setShadowLayer来设置阴影颜色和尺寸，进行阴影绘制，用path来画出drawable的形状。 封装了changeTheme的方法，可以直接设置主题的颜色。
本示例中为了更好地实现效果，用了TopDrawable、CenterDrawable、BottomDrawable三部分拼接而成，也可以用来实现打印小票的视觉效果。另外添加了一个类似FloatingButton效果的CircleShadowDrawable。
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