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App crashes after pushing mapView off stack

#1

Hi,

We have a bug where the map crashes when we try to push it off the navigation page stack. This does not happen on iOS.
The map uses a custom WMS server, and a GpsMarker is shown in the map. I tried running the Dispose() function, but it would crash my application.
Is there any other solution?

The error code can be seen below:

04-11 10:49:28.373 D/Mono ( 4006): DllImport attempting to load: ‘/system/lib/liblog.so’.
04-11 10:49:28.383 D/Mono ( 4006): DllImport loaded library ‘/system/lib/liblog.so’.
04-11 10:49:28.383 D/Mono ( 4006): DllImport searching in: ‘/system/lib/liblog.so’ (’/system/lib/liblog.so’).
04-11 10:49:28.383 D/Mono ( 4006): Searching for ‘__android_log_print’.
04-11 10:49:28.383 D/Mono ( 4006): Probing ‘__android_log_print’.
04-11 10:49:28.383 D/Mono ( 4006): Found as ‘__android_log_print’.
04-11 10:49:28.393 I/MonoDroid( 4006): UNHANDLED EXCEPTION:
04-11 10:49:28.413 I/MonoDroid( 4006): System.ObjectDisposedException: Cannot access a disposed object.
04-11 10:49:28.413 I/MonoDroid( 4006): Object name: ‘ThinkGeo.MapSuite.AndroidEdition.GpsMarker’.
04-11 10:49:28.413 I/MonoDroid( 4006): at Java.Interop.JniPeerMembers.AssertSelf (Java.Interop.IJavaPeerable self) [0x00030] in /Users/builder/data/lanes/4009/9578cdcd/source/Java.Interop/src/Java.Interop/Java.Interop/JniPeerMembers.cs:153
04-11 10:49:28.413 I/MonoDroid( 4006): at Java.Interop.JniPeerMembers+JniInstanceMethods.InvokeVirtualVoidMethod (System.String encodedMember, Java.Interop.IJavaPeerable self, Java.Interop.JniArgumentValue* parameters) [0x00002] in /Users/builder/data/lanes/4009/9578cdcd/source/Java.Interop/src/Java.Interop/Java.Interop/JniPeerMembers.JniInstanceMethods_Invoke.cs:21
04-11 10:49:28.413 I/MonoDroid( 4006): at Android.Views.View.Invalidate () [0x00000] in /Users/builder/data/lanes/4009/9578cdcd/source/monodroid/src/Mono.Android/platforms/android-24/src/generated/Android.Views.View.cs:13761
04-11 10:49:28.413 I/MonoDroid( 4006): at ThinkGeo.MapSuite.AndroidEdition.GpsMarker.b__0 () [0x00001] in :0
04-11 10:49:28.413 I/MonoDroid( 4006): at Java.Lang.Thread+RunnableImplementor.Run () [0x0000b] in /Users/builder/data/lanes/4009/9578cdcd/source/xamarin-android/src/Mono.Android/Java.Lang/Thread.cs:36
04-11 10:49:28.413 I/MonoDroid( 4006): at Java.Lang.IRunnableInvoker.n_Run (System.IntPtr jnienv, System.IntPtr native__this) [0x00009] in /Users/builder/data/lanes/4009/9578cdcd/source/monodroid/src/Mono.Android/platforms/android-24/src/generated/Java.Lang.IRunnable.cs:81
04-11 10:49:28.413 I/MonoDroid( 4006): at (wrapper dynamic-method) System.Object:2ed9769d-508b-48e1-b96d-b33a7ed9f791 (intptr,intptr)
04-11 10:49:28.453 W/art ( 4006): JNI RegisterNativeMethods: attempt to register 0 native methods for android.runtime.JavaProxyThrowable

#2

Hi Jehans,

It looks you have the same question in ticket 16966.

We will reply you there.

Regards,

Don

#3

Hello!
We solved this bug here, and if anyone else should experience it, here is the code:

protected override void OnDisappearing()
		{
			EndMap();
			base.OnDisappearing();
		}

        void EndMap()
        {
			mapView.Overlays.Clear();
        }

This should be implemented in your xaml.cs file containing the mapview.

#4

Hi Jehans,

Thanks for your share, and don’t worry about the ticket.

We will close it, it won’t reduce your ticket number.

Regards,

Don