dialogFragment deprecated

Android
1

i got a problem when i want show some dialog fragment android studio tell me fragmentManager is deprecated and "show(…) is also depracated ? can you give me some explanation please` itemView.item_add_photo.setOnClickListener{

            UserInfo.itemId=item_id
            var obj=QtyFragment()
            var manager=(itemView.context as Activity).fragmentManager
            obj.show(manager,"Qty")







        }

`