How proving a bug's root cause beat guessing in a CameraX Android rotation fix
A developer debugging an Android barcode scanner discovered that rotating a tablet 180° left the camera preview intact but caused the image analyzer to receive upside-down frames. Initial investigation by an AI coding agent suggested waiting for a display rotation value to update before rebinding the camera, but the developer paused and demanded evidence of the true cause instead. Structured logging revealed that while the display correctly updated to ROTATION_270, ImageAnalysis.targetRotation remained stuck at ROTATION_90, leaving ImageProxy.rotationDegrees at zero. With the root cause confirmed, the fix was straightforward: use an OrientationEventListener to update both Preview and ImageAnalysis target rotations together, eliminating any need for delays or camera rebinding. The case highlights how demanding measurable proof before applying a fix can lead to simpler, more reliable solutions.
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