QR Lukeminen - HenriPirinen/Feeling1PersonalTrainerApp GitHub Wiki http://www.c-sharpcorner.com/article/qr-code-scanning-using-android-studio/ https://www.youtube.com/watch?v=o69UqAKi47I https://www.numetriclabz.com/android-qr-code-scanner-using-zxingscanner-library-tutorial/