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I was able to reproduce this with multiple devices and the simulator.
System.NullReferenceException: Object reference not set to an instance of an object.
at Xamarin.Forms.Platform.Android.AppCompat.PickerRenderer.<OnClick>b__9_2 (System.Object sender, System.EventArgs args) [0x00000] in C:\BuildAgent\work\aad494dc9bc9783\Xamarin.Forms.Platform.Android\AppCompat\PickerRenderer.cs:110
at Android.Content.IDialogInterfaceOnDismissListenerImplementor.OnDismiss (IDialogInterface dialog) [0x0000d] in /Users/builder/data/lanes/3540/1cf254db/source/monodroid/src/Mono.Android/platforms/android-23/src/generated/Android.Content.IDialogInterface.cs:369
at Android.Content.IDialogInterfaceOnDismissListenerInvoker.n_OnDismiss_Landroid_content_DialogInterface_ (IntPtr jnienv, IntPtr native__this, IntPtr native_dialog) [0x00011] in /Users/builder/data/lanes/3540/1cf254db/source/monodroid/src/Mono.Android/platforms/android-23/src/generated/Android.Content.IDialogInterface.cs:334
at at (wrapper dynamic-method) System.Object:bf8be781-1e0b-4597-8aa4-0c6bfbebedf6 (intptr,intptr,intptr)
Can you attach a reproduction? Are you talking about clicking off of the picker, on the cancel button, or something else? I believe this should have been recently addressed.
clicking off of the picker. I don't know about it having been addressed. I'm using Forms 18.104.22.168.
Same problem here with Xamarin Forms 22.214.171.124 on Android and iOS.
Is there a fix planned for this bug?
Easy to reproduce with a big list (list of countries for example):
- Open picker
- Scroll down
- Tap on "done" before scrolling has ended
Any progress on this? I'm getting the same issue on Android with Forms version 126.96.36.199.
I was able to reproduce it as well.
I'm in a page where we have a Picker, I click on it really quickly and then I return to the former page (I have a page with some pickers and a OK button, like a filtering page). App goes to the former page and shows the Picker dialog, after pressing OK/CANCEL on it, app crashes.
See crash log:
at Xamarin.Forms.Platform.Android.PickerRenderer.<OnClick>b__10_0 (System.Object s, Android.Content.DialogClickEventArgs a) [0x00000] in C:\BuildAgent2\work\aad494dc9bc9783\Xamarin.Forms.Platform.Android\Renderers\PickerRenderer.cs:113
at Android.Content.IDialogInterfaceOnClickListenerImplementor.OnClick (Android.Content.IDialogInterface dialog, System.Int32 which) [0x0000d] in /Users/builder/data/lanes/3819/96c7ba6c/source/monodroid/src/Mono.Android/platforms/android-23/src/generated/Android.Content.IDialogInterface.cs:250
at Android.Content.IDialogInterfaceOnClickListenerInvoker.n_OnClick_Landroid_content_DialogInterface_I (System.IntPtr jnienv, System.IntPtr native__this, System.IntPtr native_dialog, System.Int32 which) [0x00011] in /Users/builder/data/lanes/3819/96c7ba6c/source/monodroid/src/Mono.Android/platforms/android-23/src/generated/Android.Content.IDialogInterface.cs:201
at (wrapper dynamic-method) System.Object:ae0990ee-3ce1-4013-bbc5-d280fc6ebd0e (intptr,intptr,intptr,int)
Seeing the same issue attempting to load some content based on the picker selection.
Android Unhandled exception: System.NullReferenceException: Object reference not set to an instance of an object.
at Xamarin.Forms.Platform.Android.PickerRenderer.<OnClick>b__11_2 (System.Object sender, System.EventArgs args) [0x00000] in C:\BuildAgent3\work\ca3766cfc22354a1\Xamarin.Forms.Platform.Android\Renderers\PickerRenderer.cs:145
at Android.Content.IDialogInterfaceOnDismissListenerImplementor.OnDismiss (Android.Content.IDialogInterface dialog) [0x0000d] in /Users/builder/data/lanes/4009/9578cdcd/source/monodroid/src/Mono.Android/platforms/android-23/src/generated/Android.Content.IDialogInterface.cs:369
at Android.Content.IDialogInterfaceOnDismissListenerInvoker.n_OnDismiss_Landroid_content_DialogInterface_ (System.IntPtr jnienv, System.IntPtr native__this, System.IntPtr native_dialog) [0x00011] in /Users/builder/data/lanes/4009/9578cdcd/source/monodroid/src/Mono.Android/platforms/android-23/src/generated/Android.Content.IDialogInterface.cs:334
at (wrapper dynamic-method) System.Object:7f80ad2f-4c9d-4cac-8b89-acf123a76958 (intptr,intptr,intptr)
email@example.com: Are you able to provide a small reproduction project exhibiting the issue? Thank you!
I was able to reproduce it on 188.8.131.52, but in the latest version (184.108.40.206) it seems to be working fine.
Check this reproduction project.
Steps:You just need to tap the button in the first screen, then, in the 2nd one, tap the picker and back arrow really fast, so it will go back to the former screen, but the modal will be still opened. Close the modal and then you will see the crash on 220.127.116.11.
The weird part is, if I upgrade XF package (and Support, etc) in my real project, the error still happens, so not sure what's impacting it.
Created attachment 21736 [details]
Created attachment 21737 [details]
any updates on this bug? it happens quite frequently and there's a few repro cases above.
Thank you for taking the time to submit this report. After reviewing the description of this bug, we believe it no longer affects the current version of Xamarin.Forms 2.3.4 stable. If you are still experiencing the issue after updating your packages, please reopen this report with an attached reproduction.
Here are some reproduction best practices: https://gist.github.com/jassmith/92405c300e54a01dcc6d