this post was submitted on 28 Sep 2022
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Android dev: How to scan a QR code (lemmy.ml)
submitted 2 years ago by Yujiri@lemmy.ml to c/android@lemmy.ml
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I'm making an app for a new federated messaging protocol, Sufec, which needs to be able to link a device by scanning a QR code, for multi-device support. I can't for the life of me find a way to do this anywhere on the internet. I want a solution that:

  • Doesn't depend on the image already being scanned and saved (ie. it should open a camera app, not a files app)
  • QR code should be detected by the camera app, so the user doesn't have to snap a picture, then return to the messaging app and see an error that the QR code couldn't be read
  • Doesn't depend on having any specific app installed
  • Is not deprecated
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[–] Yujiri@lemmy.ml 0 points 2 years ago (1 children)

Binary Eye is a scanning app. I'm not trying to make a scanning app, I'm trying to call out to one. What I'd hoped is that Android has some way to call out to "whatever the user has set as default barcode scanning app", but maybe there just isn't such an interface.

I would look at just embedding the scanning functionality into my app itself, but Binary Eye is massive! And there are dependencies on other third-party camera libraries in there, so that's not even all of it.

[–] mp3@lemmy.ml 1 points 2 years ago (1 children)

It's is a scanning app, but its core relies on the zxing library. Sadly there isn't a standardized way of calling a default barcode scanning app on Android, so your only option is to build your own inside the app, or rely in the zxing library.

[–] Yujiri@lemmy.ml 1 points 2 years ago (1 children)

Thanks!

[–] Yujiri@lemmy.ml 1 points 2 years ago

Hey @mp3, thought I should come back and give you an update! I finally managed to do as you said with the zxing library and get it to work! In just a minute, I'll be able to commit this feature :)