code for android app involving QR

i have a QR code which include access to my websiteif i point my camera to it - the smartphone will access this websitei plan also to have an app (which include reading QR)i want that if the user is u i have a QR code which include access to my websiteif i point my camera to it - the smartphone will access this websitei plan also to have an app (which include reading QR)i want that if the user is using the app and get to the part that he will need to scan a QR - for the same QR code - the app will not direct him to the websi...