René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Android crash in Google automated tests: onAccessibilityStateChanged: Cannot read properties of null (reading 'set')","articleBody":"### Issue Description\n\nWe’re seeing an Android crash that we can reproduce only in Google Play Console automated testing / pre-launch reports (x86 virtual device). We can’t reproduce it locally on physical devices/emulators, but the stack trace consistently points to the accessibility callback path and the fix below stops it in Google tests.\n\n```\nException com.tns.NativeScriptException: Calling js method onAccessibilityStateChanged failed\nTypeError: Cannot read properties of null (reading 'set')\n  at com.tns.Runtime.callJSMethodNative\n  at com.tns.Runtime.dispatchCallJSMethodNative (Runtime.java:1384)\n  at com.tns.Runtime.callJSMethodImpl (Runtime.java:1270)\n  at com.tns.Runtime.callJSMethod (Runtime.java:1257)\n  at com.tns.Runtime.callJSMethod (Runtime.java:1235)\n  at com.tns.Runtime.callJSMethod (Runtime.java:1231)\n  at com.tns.gen.android.view.accessibility.AccessibilityManager_AccessibilityStateChangeListener.onAccessibilityStateChanged (AccessibilityManager_AccessibilityStateChangeListener.java:19)\n  at android.view.accessibility.AccessibilityManager.lambda$notifyAccessibilityStateChanged$0 (AccessibilityManager.java:1710)\n  at android.view.accessibility.AccessibilityManager$$ExternalSyntheticLambda0.run (Unknown Source:4)\n  at android.os.Handler.handleCallback (Handler.java:938)\n  at android.os.Handler.dispatchMessage (Handler.java:99)\n  at android.os.Looper.loopOnce (Looper.java:201)\n  at android.os.Looper.loop (Looper.java:288)\n  at android.app.ActivityThread.main (ActivityThread.java:7870)\n  at java.lang.reflect.Method.invoke\n  at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run (RuntimeInit.java:548)\n  at com.android.internal.os.ZygoteInit.main (ZygoteInit.java:1003)\n```\n***Suspected root cause in NativeScript core***\n[application.android.ts](https://github.com/NativeScript/NativeScript/blob/1daeed5ca6be91185896b10e0ad5604f5798269a/packages/core/application/application.android.ts#L725)\n\nupdateAccessibilityState() calls:\n```\nsharedA11YObservable.set(...)\n```\nbut sharedA11YObservable can be undefined.\n\nAfter applying this patch to **updateAccessibilityState** function, the crash stopped appearing in Google automated testing:\n```\n    if (!sharedA11YObservable) {\n        return;\n    }\n```\n```\nfunction updateAccessibilityState() {\n    if (!sharedA11YObservable) {\n        return;\n    }\n    const accessibilityManager = getAndroidAccessibilityManager();\n    if (!accessibilityManager) {\n        sharedA11YObservable.set(accessibilityStateEnabledPropName, false);\n        sharedA11YObservable.set(touchExplorationStateEnabledPropName, false);\n        return;\n    }\n    sharedA11YObservable.set(accessibilityStateEnabledPropName, !!accessibilityManager.isEnabled());\n    sharedA11YObservable.set(touchExplorationStateEnabledPropName, !!accessibilityManager.isTouchExplorationEnabled());\n}\n```\n\n### Reproduction\n\nWe cannot reproduce this crash manually.\nIt appears only in Google Play automated testing / pre-launch reports on an x86 virtual device.\n\n### Relevant log output (if applicable)\n\n```shell\n\n```\n\n### Environment\n\n```yaml\nOS: macOS 26.2\nCPU: (16) arm64 Apple M4 Max\nShell: /bin/zsh\nnode: 25.1.0\nnpm: 11.6.2\nnativescript: 9.0.1\n\n# android\njava: 17.0.17\nndk: Not Found\napis: Not Found\nbuild_tools: Not Found\nsystem_images: Not Found\n\n# ios\nxcode: 26.0.1/17A400\ncocoapods: 1.16.2\npython: Not Found\npython3: 3.9.6\nruby: 3.3.10\nplatforms: \n  - DriverKit 25.0\n  - iOS 26.0\n  - macOS 26.0\n  - tvOS 26.0\n  - visionOS 26.0\n  - watchOS 26.0\n```\n\n### Dependencies\n\n```json\n\"devDependencies\": {\n  \"@angular-devkit/build-angular\": \"~16.2.0\",\n  \"@angular/compiler-cli\": \"~16.2.0\",\n  \"@nativescript/android\": \"9.0.2\",\n  \"@nativescript/ios\": \"9.0.2\",\n  \"@nativescript/types\": \"9.0.0\",\n  \"@nativescript/webpack\": \"5.0.29\",\n  \"@ngtools/webpack\": \"~16.2.0\",\n  \"@types/url-parse\": \"^1.4.11\",\n  \"process\": \"^0.11.10\",\n  \"typescript\": \"5.1.6\",\n  \"util\": \"^0.12.5\"\n}\n```\n\n### Please accept these terms\n\n- [x] I have searched the [existing issues](https://github.com/NativeScript/NativeScript/issues) as well as [StackOverflow](https://stackoverflow.com/questions/tagged/nativescript) and this has not been posted before\n- [x] This is a bug report\n- [x] I agree to follow this project's [Code of Conduct](https://github.com/NativeScript/NativeScript/blob/master/tools/notes/CONTRIBUTING.md#coc)","author":{"url":"https://github.com/pichurichko","@type":"Person","name":"pichurichko"},"datePublished":"2026-01-15T18:26:57.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":0},"url":"https://github.com/11049/NativeScript/issues/11049"}