feat(kscan): replace ML Kit with zxing-cpp on Android - #1846
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Decodes with zxing-cpp 3.1.1 instead of Google ML Kit, so every dependency is open source and no Play Services libraries are pulled in. Frames are analyzed on a dedicated thread since zxing-cpp decodes synchronously; filter and result callbacks stay on the main thread. ML Kit's zoom suggestions (auto-zoom) are removed; zoom is manual only. The manual inverted-frame pass is dropped in favour of tryInvert.
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📝 WalkthroughWalkthroughAndroid barcode scanning now uses zxing-cpp instead of ML Kit. Format mapping, synchronous frame decoding, executor usage, lifecycle cleanup, consumer rules, documentation, and unit tests were updated. ChangesBarcode scanning migration
Priority: ➖ Normal Estimated code review effort: 3 (Moderate) | ~25 minutes Change: Feature Sequence Diagram(s)sequenceDiagram
participant CameraX as CameraX ImageAnalysis
participant Analyzer as BarcodeAnalyzer
participant ZXing as BarcodeReader
participant Main as Main callback executor
CameraX->>Analyzer: Analyze image frame
Analyzer->>ZXing: Read frame
ZXing-->>Analyzer: Return barcode results
Analyzer->>Main: Dispatch filtered results or failure
Suggested reviewers: Merge Risk: 🟡 Moderate · up to The migrated scanner can reject valid scans or return barcodes outside the requested content type. These correctness regressions should be fixed before merge. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Docstring CoverageExplanation Docstring coverage is 13.33% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 15 functions across 5 files. (3 skipped: 3 unsupported.) ✨ Finishing Touches🧪 Generate unit tests (beta)
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Actionable comments posted: 3
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Inline comments:
In `@shared/kscan/src/androidMain/kotlin/org/ncgroup/kscan/BarcodeAnalyzer.kt`:
- Line 85: In BarcodeAnalyzer’s confirmed-result loop, replace the early return
after filter(barcode) rejects a barcode with continue so remaining results are
evaluated. Add a regression test covering a rejected result followed by an
accepted result reaching onSuccess.
- Line 59: Update BarcodeAnalyzer.analyze to detect and rethrow
CancellationException before invoking onFailed in the broad Exception catch
around imageProxy.use and reader.read. Continue reporting other exceptions
through callbackExecutor.execute, preserving the existing closed check.
In
`@shared/kscan/src/androidMain/kotlin/org/ncgroup/kscan/BarcodeFormatMapper.kt`:
- Line 39: Restore filtering for type-only requests in the migrated analyzer’s
result-processing path: use the requested content types/codeTypes to reject
decoded results whose format does not match, rather than relying only on
isKnownFormat or treating an empty mapped set as unrestricted. Preserve
unrestricted behavior only for genuinely absent format constraints, and add
coverage for a TYPE_* request that excludes unrelated known symbologies.
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gradle/libs.versions.tomlshared/kscan/README.mdshared/kscan/build.gradle.ktsshared/kscan/consumer-rules.proshared/kscan/src/androidMain/kotlin/org/ncgroup/kscan/BarcodeAnalyzer.ktshared/kscan/src/androidMain/kotlin/org/ncgroup/kscan/BarcodeFormatMapper.ktshared/kscan/src/androidMain/kotlin/org/ncgroup/kscan/ScannerView.android.ktshared/kscan/src/androidUnitTest/kotlin/org/ncgroup/kscan/BarcodeFormatMapperTest.kt
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…ejection Restore the ML Kit era rule that decoded results must match codeTypes, not merely be a known symbology. A rejected filter result now moves on to the next candidate instead of ending the frame.
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Progresses toward f-droid release preparations
Replaces mlkit with zxing-cpp on android. Frames are analyzed on a dedicated thread since zxing-cpp decodes synchronously; filter and result callbacks stay on the main thread.
ML Kit's zoom suggestions (auto-zoom) are removed. The manual inverted-frame pass is dropped in favour of tryInvert.
Final apk size reduction is expected. processes QRCodes up to 7 times faster.
Summary by CodeRabbit
New Features
Tests