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It is a very simple android project that might be divided into 2 steps.
1.First function allows user to scan their QR code to the camera of the tablet after that QR number and the date/time will be saved in server database.
2. There will be product names on the screen of the tablet. Whenever one of the product name is touched and selected, it directs you to scan QR code. The product number and user QR number are saved in server database.
PS. Product list should be taken from Mysql database. Zxing QR code library might be used.
Please quote your best bid!