blur window when showing AlertDialog in android -

i want make background window blur when showing alert dialog. have tried -

 windowmanager.layoutparams lp = dialog.getwindow().getattributes();     lp.dimamount = 0.0f;     dialog.getwindow().setattributes(lp);     dialog.getwindow().addflags(windowmanager.layoutparams.flag_blur_behind); 

but not working in, seems "flag_blur_behind" deprecated. there other way achieve without using third party libraries?