提供关于PopupWindow使用过程中遇到的一些特殊问题的解决方案，例如：PopupWindow不响应点击外部消失和返回键消失的解决方法；PopupWindow精确计算要显示位置原理和方法；实现带箭头的上下文菜单遇到的坑；Android7.0 PopupWindow的兼容问题;屏幕旋转时调用PopupWindow update方法更新位置失效的问题及解决方案
@drawable/button_bg_selector 没有提交~~
// 设置好参数之后再show
int windowPos[] = PopupWindowUtil.calculatePopWindowPos(anchorView, contentView);
我要怎么动态设置rv的高度.
例如我的rv 会显示很多条目,但是一次最多显示5条,也会有情况数据最多也就小于五条的时候,就需要动态设置当前rv的高度
android.support.v7.widget.TintContextWrapper cannot be cast to android.app.Activity
Could not find class 'android.graphics.drawable.RippleDrawable', referenced from method android.support.v7.widget.AppCompatImageHelper.hasOverlappingRendering
智能poupwindow倒数第二个，是向上还是向下，不准啊（省略一个表情）
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