| QRCodeReaderScreen.BarCodeValidator | Interface for barcode validation |
| QRCodeReaderScreen.OnMultiBarCodeDetectorListener | Interface for barcode detect |
| QRCodeReaderDialogFragment | Basic implementation of QRCodeReaderScreen as a Dialog Fragment. |
| QRCodeReaderScreen | A new implementation of barcode scanner which provide offline version of barcode scan without google play services. |
| QRCodeReaderScreen.InvisibleFragment | Fragment for request permission and open system gallery |