Cwa-app-android: QR Code cannot be re-added after accidental deletion

[daimpi]

Avoid duplicates

checked. This issue was reported under Android, I'm not sure whether this could also apply to iOS though. If this is the case feel free to move it to the documentation repo.

Describe the bug

Somebody on Twitter asked me to post this for them: they recently got tested, entered the QR code in the App, but accidentally deleted it shortly afterwards. When trying to scan it again, they get an error. Now they can’t find out about their test result.

Expected behaviour

After deleting the test, it should be possible to add it again without an error occurring

Technical details

• CWA version 1.1.1

Additional context

Twitter Thread: https://twitter.com/VerpissDichh/status/1289974550315204608

[thomasaugsten]

Hi unfortunately this is not possible. We have to ensure only one phone can scan the qr code and submit his diagnoses keys. We are not allowed to save an ID of the phone this is the reason why the qr code is only valid for one scan.
Please wait for the normal way (a letter via post mail or Gesundheitsamt calls you) of the test lab to get your result.

[vaubaehn]

@daimpi
Do you know if there is any information shown to the user during the process of scanning the qr-code or before deleting, that after deleting the qr-code becomes invalid?
If not, it might be worth to ping maintainers/dev again, to ask for improvement of ux -> inserting warning that qr-code becomes non-reversible invalid after deleting, and user has to wait for the normal way after.

[daimpi]

@vaubaehn I unfortunately don't know what kind of warning message comes up in case you try to delete an entry, I was just forwarding this issue for someone on twitter. And yes I agree, that warning should at least make it very clear that deletion will be permanent and re-scanning will not work.

@thomasaugsten thanks for the explanation, could you maybe point us in the direction where to find the warning messages in case of an attempted deletion?

[thomasaugsten]

This is the current text of the alert
https://github.com/corona-warn-app/cwa-app-android/blob/fb7267d1bdfc843b04580e1e05ef926051feffeb/Corona-Warn-App/src/main/res/values-de/strings.xml#L810

[vaubaehn]

The warning message _is_ indeed very clear...

[daimpi]

Yes agreed 🙂.

And if there is anyway a second line of notification via phone/mail to fall back on, it's also not the end of the world if someone actually deletes their result. I was afraid that this line might not exist, which would have been a much worse situation.