Use Virtual and Physical Keyboard at same time

Previously I've read this article: Article , but it did not help. I have an android device Samsung Galaxy V (Duos) - KitKat 4.4.2. I use this device to process the input using the Barcode Scanner. I understand the barcode scanner will be detected as a physical keyboard, and I also understand that when these devices are connected, then I can not use the Virtual Keyboard. The question is, how do I be able to use virtual keyboard while physical keyboard connected?