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[Android] ObjectDisposedException in AndroidCompassProvider tearing down MAUI app

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2
Sunday
esp1rl
by
Occasional Contributor
Sunday

EDIT: not all Android users experience it, and it doesn't happen on every startup, it occurs once in a while

Hi, this exception is from a MAUI 10.0.70 app using ArcGIS Maps SDK 300.0.0.

Many of our Android users experience this one, and it happens at app startup. Well before any IWindowManagerInvoker is expected to be disposed of.

The app initializes MapView.LocationDisplay on startup with default data source. Initialization happens at MapView.Loaded event.

android.runtime.JavaProxyThrowable: [System.ObjectDisposedException]: Cannot access disposed object with JniIdentityHashCode=48158090.
Object name: 'Android.Views.IWindowManagerInvoker'.
	at Android.Views.IWindowManagerInvoker.get_DefaultDisplay + 0x0(Unknown Source)
	at Esri.ArcGISRuntime.Location.AndroidCompassProvider.Android.Hardware.ISensorEventListener.OnSensorChanged + 0x0(Unknown Source)
	at Android.Hardware.ISensorEventListenerInvoker.n_OnSensorChanged_Landroid_hardware_SensorEvent_ + 0x0(Unknown Source)
	at crc64f261feee1d215ead.AndroidCompassProvider.n_onSensorChanged(Native Method)
	at crc64f261feee1d215ead.AndroidCompassProvider.onSensorChanged(AndroidCompassProvider.java:37)
	at android.hardware.SystemSensorManager$SensorEventQueue.dispatchSensorEvent(SystemSensorManager.java:1203)
	at android.os.MessageQueue.nativePollOnce(Native Method)
	at android.os.MessageQueue.nextLegacy(MessageQueue.java:985)
	at android.os.MessageQueue.next(MessageQueue.java:1094)
	at android.os.Looper.loopOnce(Looper.java:222)
	at android.os.Looper.loop(Looper.java:392)
	at android.app.ActivityThread.main(ActivityThread.java:10346)
	at java.lang.reflect.Method.invoke(Native Method)
	at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:638)
	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:972)

 
PS: Would it be an idea to wrap the compass provider code (and similar code) in try/catch to avoid tearing down the whole app? Or perhaps route the exception through a mechanism akin to TaskScheduler.UnobservedTaskException and possibility to use SetObserved().

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2 Replies
GKmieliauskas
by Esri Regular Contributor
Esri Regular Contributor
Sunday

Hi,

Our app initializes MapView.LocationDisplay with default data source on OnPageLoaded event. It works without issues.

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esp1rl
by
Occasional Contributor
yesterday

This error may trigger due to the lifecycle of the app, in case of pause/resume. Claude suggest that the IWindowManagerInvoker may be cached in a .NET class field, and become garbage collected on the Java side while on the .NET side an active reference is kept, to what is then a disposed object. That could explain the JNI details in the exception. Other reasons could be improper usage of JavaCast.

Claude also identified the Android WindowManager getDefaultDisplay to be a deprecated API at Android API level 30 / Android 11 (September 2020). Please see WindowManager  |  API reference  |  Android Developers

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