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fix(scanner): fall back to any camera when there is no back camera - #1752
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The scanner required LENS_FACING_BACK. An Infinix X688B exposes one camera
to CameraX and reports it as front facing, so every bind threw
IllegalArgumentException("No available camera can be found"), was retried
three times a second apart, and left a blank preview (Bugsnag
6aca4823396a2e952015e21d, 9 events on 2026.10.2).
Prefer the back camera and otherwise bind the first camera the device
exposes. Stop retrying IllegalArgumentException, which doesn't change
between attempts. A device with no camera now fails with
NoCamerasAvailableException, which shows the unavailable state and is no
longer reported as an error.
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type: fix
When the device has no back camera, CodeScanner reports the front-camera fallback and the scan screen shows a floating toast, once per scanner: "No back camera found. Using your front camera."
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The scanner required
LENS_FACING_BACK. An Infinix X688B exposes a single camera to CameraX and reports it as front facing, so every bind threwIllegalArgumentException: No available camera can be found.bindWithRetrytried three times, a second apart, and the user got a blank preview. Each return to the screen repeated it: 9 events on 2026.10.2 (Bugsnag6aca4823396a2e952015e21d).CodeScanner.kt: choose the camera at bind time. Use the back camera when there is one, otherwise the first camera the device exposes. A code held up to a front camera still scans.bindWithRetry: don't retryIllegalArgumentException. CameraX throws it when no camera matches or the use cases can't be combined, and neither changes between attempts.NoCamerasAvailableException, soScanner.ktshows the unavailable state. That case is no longer sent toErrorUtils.handleError, since it describes the device rather than a bug.The front-camera preview is mirrored. Analysis runs on the raw frames, but Kik code decoding on a front camera hasn't been tried.
ScannerCameraSelectionTestcovers the camera choice and the retry behaviour.