Disable Google Wallet / NFC when showing QR code

[recursiveribbons]

Dutch train stations are equipped with a combination QR code scanner and credit card reader, which triggers Google Wallet when a phone is brought up to the reader. Catima should disable the NFC reader while showing a QR code so a user doesn't accidentally pay with a stored credit card while trying to scan a QR code train ticket.

It appears that NfcAdapter.enableReaderMode (docs, so) is the only solution here. Reader mode disables Google Wallet. Enable when a QR code is on screen and disable when not.

[ikanakova]

If you implement this, please do so as an option, because I'm sure a lot of people pay by mobile with Catima running with a QR code is on screen.

[TheLastProject]

@ikanakova Do you have some cases where you'd want to do this? The use case @recursiveribbons mentioned was very clear and I do want to avoid adding settings for things (almost) nobody would change (as it makes the settings screen more complicated and makes it harder to find the setting you need) and, if we need a setting, I want to make sure it has the right default and is in the right place so I'll need more info about the use cases.

[ikanakova]

The way I use Catima is that I show the QR code of the card to the salesperson and almost immediately pay with my mobile, so I still have Catima open. If Catima disabled the NFC reader while showing a QR code, my mobile payment would not work until I closed the QR code, which I often don't have time to do in the store queue.

[TheLastProject]

Hmm that makes sense, I've seen someone show a QR code and then pay with their watch while waiting for it to be scanned with another app having similar issues.

Maybe this should be a per-card setting? Some toggle on the card-viewing screen? For Dutch trains it would never make sense to have NFC on while scanning the code, but for other stores you probably want it left on.