The following three conditions must be, to the popupWindow call before displaying
popupWindow.setOutsideTouchable ( to true) ;
popupWindow.setFocusable ( to true) ;
popupWindow.setBackgroundDrawable ( new new BitmapDrawable ()) ;
PopupWindow click on a blank area disappear
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Origin www.cnblogs.com/lianzhen/p/11416739.html
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