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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[–] 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 :)