Picker inside SlideMenuView crashes with WindowManagerBadTokenException when touched

[thearaks]

On Android, when touching a Picker inside SlideMenuView, the Dialog crashes with WindowManagerBadTokenException.

Here the stack trace:

[MonoDroid] Android.Views.WindowManagerBadTokenException: Unable to add window -- token null is not valid; is your activity running?
[MonoDroid]   at Java.Interop.JniEnvironment+InstanceMethods.CallVoidMethod (Java.Interop.JniObjectReference instance, Java.Interop.JniMethodInfo method, Java.Interop.JniArgumentValue* args) [0x00069] in <d4a98e22dd594c16aa2b2444769b8e26>:0 
[MonoDroid]   at Java.Interop.JniPeerMembers+JniInstanceMethods.InvokeVirtualVoidMethod (System.String encodedMember, Java.Interop.IJavaPeerable self, Java.Interop.JniArgumentValue* parameters) [0x0002a] in <d4a98e22dd594c16aa2b2444769b8e26>:0 
[MonoDroid]   at Android.App.Dialog.Show () [0x0000a] in <6fb9e29d5d9c406081b6b60ff686e897>:0 
[MonoDroid]   at Xamarin.Forms.Platform.Android.AppCompat.PickerRenderer.OnClick () [0x000ec] in D:\a\1\s\Xamarin.Forms.Platform.Android\AppCompat\PickerRenderer.cs:134 
[MonoDroid]   at Xamarin.Forms.Platform.Android.AppCompat.PickerRenderer+PickerListener.OnClick (Android.Views.View v) [0x0000b] in D:\a\1\s\Xamarin.Forms.Platform.Android\AppCompat\PickerRenderer.cs:175 
[MonoDroid]   at Android.Views.View+IOnClickListenerInvoker.n_OnClick_Landroid_view_View_ (System.IntPtr jnienv, System.IntPtr native__this, System.IntPtr native_v) [0x00011] in <6fb9e29d5d9c406081b6b60ff686e897>:0 
[MonoDroid]   at (wrapper dynamic-method) System.Object.79bb8dcd-2e68-45e2-b211-d6e66f078180(intptr,intptr,intptr)
[MonoDroid]   --- End of managed Android.Views.WindowManagerBadTokenException stack trace ---
[MonoDroid] android.view.WindowManager$BadTokenException: Unable to add window -- token null is not valid; is your activity running?
[MonoDroid] 	at android.view.ViewRootImpl.setView(ViewRootImpl.java:765)
[MonoDroid] 	at android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java:356)
[MonoDroid] 	at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:93)
[MonoDroid] 	at android.app.Dialog.show(Dialog.java:330)
[MonoDroid] 	at md58432a647068b097f9637064b8985a5e0.PickerRenderer_PickerListener.n_onClick(Native Method)
[MonoDroid] 	at md58432a647068b097f9637064b8985a5e0.PickerRenderer_PickerListener.onClick(PickerRenderer_PickerListener.java:30)
[MonoDroid] 	at android.view.View.performClick(View.java:6294)
[MonoDroid] 	at android.view.View$PerformClick.run(View.java:24770)
[MonoDroid] 	at android.os.Handler.handleCallback(Handler.java:790)
[MonoDroid] 	at android.os.Handler.dispatchMessage(Handler.java:99)
[MonoDroid] 	at android.os.Looper.loop(Looper.java:164)
[MonoDroid] 	at android.app.ActivityThread.main(ActivityThread.java:6494)
[MonoDroid] 	at java.lang.reflect.Method.invoke(Native Method)
[MonoDroid] 	at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:440)
[MonoDroid] 	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:807)

Could it be related to the fact that I'm using Xamarin.Forms 3.0 while this library is still at 2.5?
Thank you!

[jessejiang0214]

Would you please give us some demo project?

[thearaks]

Hi @jessejiang0214,
Thank you for your quick reply!

I've set up a demo project:
https://github.com/thearaks/XamarinPlayground3

Just checkout master branch, run the app, open the side menu and touch the picker (it's int the fourth row of the grid); it will crash instantly.

Thank you for your support
Mattia

[jessejiang0214]

@thearaks Thanks for your demo, I can reproduce, but I feel that it looks more the bug for Xamarin.Android, or Android's bug.
https://stackoverflow.com/questions/5796611/dialog-throwing-unable-to-add-window-token-null-is-not-for-an-application-wi

And it seems nothing I can do in this project

[thearaks]

It doesn't look an Android bug to me, maybe the Dialog is created using the wrong Context instance?
Even on that StackOverflow issue there are some suggestions that hints in that direction.
Or else I hope it's just a Xamarin.Android bug that will be fixed in future releases...

[OKameric]

Until they fix the issue, the workaround is to make Datepicker renderer and set the context to Forms.Context.