/**
* Window type: system window, such as low power alert. These windows
* are always on top of application windows.
* In multiuser systems shows only on the owning user‘s window.
*/
setWindowLayoutType(WindowManager.LayoutParams.TYPE_SYSTEM_ALERT);
本文出自 “梁肖技术中心” 博客，请务必保留此出处http://liangxiao.blog.51cto.com/3626612/1931813
Android Studio第三十九期 - popWindows置顶
原文：http://liangxiao.blog.51cto.com/3626612/1931813