Android ,实现Popupwindow弹窗的半透明显示。-Android, to achieve the translucent display pop Popupwindow.

安卓悬浮球，类360的悬浮球，悬浮窗Service 该服务会在后台一直运行一个悬浮的透明的窗体。(Android floating ball, class 360 floating ball, floating window will Service the Service runs in the background is a suspension of transparent form.)