Investigate QRCode scanning alternative

[AndreMiras]

Our current QRCode scanner is running via https://github.com/AndreMiras/garden.zbarcam
The problem is this is not yet Python3 compatible.

I had a talk with qua-non (electrum contributor) on #kivy-dev and he suggested not to use zbarcam:

[09:56] you really do not need zbarcam
[09:56] that's old and buggy
[09:57] just call for loading a external app for scanning or do as we have in electrum

See complete log here: https://botbot.me/freenode/kivy-dev/2018-05-21/?msg=100273105&page=1

Electrum approach: spesmilo/electrum@7ccbbe7

[fs-melo]

The Camera depends of the android.hardware.Camera API, that was deprecated in API level 21.
Buildozer 1.0 is not compiled android.hardware.Camera.

I think an alternative to solve the issue would be to upgrade from Camera API to Camera2 API, as in colour-blind-camera.

[AndreMiras]

Thanks for the investigation and update. Actually the original task is no longer valid since we're now based on https://github.com/kivy-garden/zbarcam which I ported to Python 3.
I didn't know about the android.hardware.Camera being deprecated actually. I should probably investigate that, but this should probably be handled more upstream in zbarcam, or xcamera or even kivy or p4a level

[fs-melo]

Thank you for explaining.
I recorded an issue in Kivy:
Kivy camera does not run on android device when compiled with Buildozer 1.0