NullReferenceException - ExtendedListView.OnMeasure

[Jesper Bolling]

After updating to the latest Telerik for Xamarin.Forms my Android project throws an exception when running:

 

03-21 11:49:29.863 I/MonoDroid( 3328): UNHANDLED EXCEPTION:

03-21 11:49:29.867 I/MonoDroid( 3328): System.NullReferenceException: Object reference not set to an instance of an object.
03-21 11:49:29.867 I/MonoDroid( 3328):   at (wrapper managed-to-native) Java.Interop.NativeMethods:java_interop_jnienv_call_nonvirtual_void_method_a (intptr,intptr&,intptr,intptr,intptr,Java.Interop.JniArgumentValue*)
03-21 11:49:29.867 I/MonoDroid( 3328):   at Java.Interop.JniEnvironment+InstanceMethods.CallNonvirtualVoidMethod (Java.Interop.JniObjectReference instance, Java.Interop.JniObjectReference type, Java.Interop.JniMethodInfo method, Java.Interop.JniArgumentValue* args) [0x0008f] in /Users/builder/data/lanes/4009/3a62f1ea/source/Java.Interop/src/Java.Interop/Java.Interop/JniEnvironment.g.cs:12079 
03-21 11:49:29.867 I/MonoDroid( 3328):   at Java.Interop.JniPeerMembers+JniInstanceMethods.InvokeVirtualVoidMethod (System.String encodedMember, Java.Interop.IJavaPeerable self, Java.Interop.JniArgumentValue* parameters) [0x00068] in /Users/builder/data/lanes/4009/3a62f1ea/source/Java.Interop/src/Java.Interop/Java.Interop/JniPeerMembers.JniInstanceMethods_Invoke.cs:31 
03-21 11:49:29.867 I/MonoDroid( 3328):   at Android.Views.View.OnMeasure (System.Int32 widthMeasureSpec, System.Int32 heightMeasureSpec) [0x0002a] in /Users/builder/data/lanes/4009/3a62f1ea/source/monodroid/src/Mono.Android/platforms/android-23/src/generated/Android.Views.View.cs:14800 
03-21 11:49:29.867 I/MonoDroid( 3328):   at Telerik.XamarinForms.DataControlsRenderer.Android.RadExtendedListView.OnMeasure (System.Int32 widthMeasureSpec, System.Int32 heightMeasureSpec) [0x00071] in <b664ae9a6fbb4834b3589dc3568115e7>:0 
03-21 11:49:29.867 I/MonoDroid( 3328):   at Android.Views.View.n_OnMeasure_II (System.IntPtr jnienv, System.IntPtr native__this, System.Int32 widthMeasureSpec, System.Int32 heightMeasureSpec) [0x00009] in /Users/builder/data/lanes/4009/3a62f1ea/source/monodroid/src/Mono.Android/platforms/android-23/src/generated/Android.Views.View.cs:14787 
03-21 11:49:29.867 I/MonoDroid( 3328):   at (wrapper dynamic-method) System.Object:c1e42a16-a523-4e8e-b034-412a0c9d22b2 (intptr,intptr,int,int)

 

Any clues?

[Nikolay]

Hello Jesper,

Could you please share more details on your specific scenario? It would be very helpful if you could zip and send us a small test app reproducing it so that we could debug and find the cause for the issue.

Regards,
Nikolay
Telerik by Progress

[Jesper Bolling]

Hey Nikolay,

 

Thanks for your interest. i actually solved it today, though I dint know which step solved it.

What I did: Updatedthe Android SDK wth the latest packages. After that I installed JAVA sdk 8, and pointed Xamarin to that one.
After that it all worked again. (I only had the error when trying compiling the android solution).