fix(gestures): Replace GestureDetectorCompat with lightweight detector to fix ANR#5138
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fix(gestures): Replace GestureDetectorCompat with lightweight detector to fix ANR#5138
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Semver Impact of This PR🟢 Patch (bug fixes) 📋 Changelog PreviewThis is how your changes will appear in the changelog. Bug Fixes 🐛
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Performance metrics 🚀
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| Revision | Plain | With Sentry | Diff |
|---|---|---|---|
| d15471f | 310.66 ms | 368.19 ms | 57.53 ms |
| 9054d65 | 330.94 ms | 403.24 ms | 72.30 ms |
| b77456b | 393.26 ms | 441.10 ms | 47.84 ms |
| 96449e8 | 361.30 ms | 423.39 ms | 62.09 ms |
| ee747ae | 357.79 ms | 421.84 ms | 64.05 ms |
| a416a65 | 295.53 ms | 373.74 ms | 78.21 ms |
| ab8a72d | 316.24 ms | 356.38 ms | 40.14 ms |
| 1564554 | 323.06 ms | 336.68 ms | 13.62 ms |
| b3d8889 | 371.69 ms | 432.96 ms | 61.26 ms |
| d15471f | 315.20 ms | 370.22 ms | 55.02 ms |
App size
| Revision | Plain | With Sentry | Diff |
|---|---|---|---|
| d15471f | 1.58 MiB | 2.13 MiB | 559.54 KiB |
| 9054d65 | 1.58 MiB | 2.29 MiB | 723.38 KiB |
| b77456b | 1.58 MiB | 2.12 MiB | 548.11 KiB |
| 96449e8 | 1.58 MiB | 2.11 MiB | 539.35 KiB |
| ee747ae | 1.58 MiB | 2.10 MiB | 530.95 KiB |
| a416a65 | 1.58 MiB | 2.12 MiB | 555.26 KiB |
| ab8a72d | 1.58 MiB | 2.12 MiB | 551.55 KiB |
| 1564554 | 1.58 MiB | 2.20 MiB | 635.33 KiB |
| b3d8889 | 1.58 MiB | 2.10 MiB | 535.06 KiB |
| d15471f | 1.58 MiB | 2.13 MiB | 559.54 KiB |
![cursor[bot]](https://avatars.githubusercontent.com/in/1210556?s=60&v=4){kind=small}
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markushi
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Mar 11, 2026
…stureDetector to fix ANR GestureDetectorCompat internally uses Handler.sendMessage/removeMessages which acquires a synchronized lock on the main thread MessageQueue, plus recordGestureClassification triggers IPC calls. This caused ANRs under load (SDK-CRASHES-JAVA-596, 175K+ occurrences). Replace with a minimal custom detector that only detects click, scroll, and fling without any Handler scheduling, MessageQueue contention, or IPC overhead. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
…velocity data Matches GestureDetector behavior: if consecutive ACTION_DOWN events arrive without an intervening ACTION_UP/ACTION_CANCEL, stale motion data could bleed into fling detection. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
…check UserInteractionIntegration gated itself on GestureDetectorCompat being available via classloader check, but SentryGestureDetector only uses Android SDK classes. Remove the check so the integration works without androidx.core. Also remove the stale proguard -keep rule. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Keep VelocityTracker alive across gesture cycles instead of obtain/recycle churn on every gesture. Add release() method called from SentryWindowCallback.stopTracking() to prevent native resource leaks when activity is destroyed mid-gesture. Also fix broken Javadoc @link to removed dependency, change onTouchEvent return to void, and remove redundant null check. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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Summary
GestureDetectorCompatwith a custom lightweightSentryGestureDetectorinSentryWindowCallbackto fix ANR SDK-CRASHES-JAVA-596 (175K+ occurrences, 574 users)GestureDetectorCompatinternally usesHandler.sendMessage/removeMessageswhich acquires asynchronizedlock on the main thread'sMessageQueue, plusrecordGestureClassification()triggers IPC/binder calls — both cause contention under loadSentryGestureListeneruses), eliminating all Handler scheduling, MessageQueue lock contention, and IPC overheadTest plan
SentryGestureDetectorTestwith 7 test cases: tap, no-tap, scroll with deltas, fling, slow release, cancel cleanup, sequential gesture resetSentryWindowCallbackTest(4 tests) passesSentryGestureListenerTestsuite passes./gradlew :sentry-android-core:testDebugUnitTestpasses🤖 Generated with Claude Code