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Syncfusion Feedback

drag and drop exception in android

Thread ID:





132788 Sep 20,2017 10:55 PM UTC Sep 21,2017 06:31 PM UTC Xamarin.Forms 1
Tags: SfDataGrid
Asked On September 20, 2017 10:55 PM UTC


I am getting sometimes following exception for my sfdatagrid with drag and drop enabled. I see in my crash logs of production version, can you image what could be the problem here? maybe you can give me some hint?


Xamarin caused by: android.runtime.JavaProxyThrowable: System.NullReferenceException: Object reference not set to an instance of an object
  at Syncfusion.SfDataGrid.XForms.Droid.GridCellBaseRenderer.get_GridRowDragDropController () [0x00010] in <7f6fe138d83a47f3b66bff185c38ebac>:0 
  at Syncfusion.SfDataGrid.XForms.Droid.GridCellBaseRenderer.get_IsRowDragging () [0x00000] in <7f6fe138d83a47f3b66bff185c38ebac>:0 
  at Syncfusion.SfDataGrid.XForms.Droid.GridCellBaseRenderer.HandleTouchForRowDragAndDrop (Android.Views.MotionEvent e) [0x00028] in <7f6fe138d83a47f3b66bff185c38ebac>:0 
  at Syncfusion.SfDataGrid.XForms.Droid.GridCellBaseRenderer.OnTouchEvent (Android.Views.MotionEvent e) [0x00008] in <7f6fe138d83a47f3b66bff185c38ebac>:0 
  at Syncfusion.SfDataGrid.XForms.Droid.GridCellRenderer.OnTouchEvent (Android.Views.MotionEvent e) [0x00000] in <7f6fe138d83a47f3b66bff185c38ebac>:0 
  at Android.Views.View.n_OnTouchEvent_Landroid_view_MotionEvent_ (System.IntPtr jnienv, System.IntPtr native__this, System.IntPtr native_e) [0x0000f] in <c625116b610c46b598bd3f628c71ddaa>:0 
  at (wrapper dynamic-method) System.Object:4770281b-9af0-4f14-b917-b40a4567472e (intptr,intptr,intptr)
	at md5b3cfe42b0b280845580702f06d56e023.GridCellRenderer.n_onTouchEvent(Native Method)
	at md5b3cfe42b0b280845580702f06d56e023.GridCellRenderer.onTouchEvent(GridCellRenderer.java:55)
	at android.view.View.dispatchTouchEvent(View.java:10717)
	at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2833)
	at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2535)
	at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2835)
	at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2550)
	at android.view.ViewGroup.cancelTouchTarget(ViewGroup.java:2762)
	at android.view.ViewGroup.removeViewInternal(ViewGroup.java:4949)
	at android.view.ViewGroup.removeViewInternal(ViewGroup.java:4930)
	at android.view.ViewGroup.removeView(ViewGroup.java:4861)
	at mono.java.lang.RunnableImplementor.n_run(Native Method)
	at mono.java.lang.RunnableImplementor.run(RunnableImplementor.java:30)
	at android.os.Handler.handleCallback(Handler.java:751)
	at android.os.Handler.dispatchMessage(Handler.java:95)
	at android.os.Looper.loop(Looper.java:154)
	at android.app.ActivityThread.main(ActivityThread.java:6732)
	at java.lang.reflect.Method.invoke(Native Method)
	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1520)
	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1410)

Ashok N [Syncfusion]
Replied On September 21, 2017 06:31 PM UTC

Hi Emil, 
Thanks for contacting Syncfusion support.  
We have checked your call stack and could you please install our SfDataGrid control latest NuGet( after clear the NuGet cache from your machine. Please refer the below KB link to get more details about NuGet cache clear    
Whenever a new NuGet package is installed, the NuGet will be stored in NuGet cache location. So please clear the NuGet cache from your machine and install new NuGet.  
Still you facing same issue, please share your SfDataGrid definition code snippet and SfDataGrid version in both PCL and Renderer project, that would be more helpful for further analyse. 


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