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An Activity that is hosting a NavigationPage will cause a NRE on a device with a physical keyboard when the screen rotates due to that device's keyboard sliding out. This happens when the normal "ConfigurationChanges = ConfigChanges.Orientation | ConfigChanges.ScreenSize" flags are set to allow orientation changes.
For example, on my Droid 4 device, as long as I do not slide out the physical keyboard, all orientation changes work as expected. Once I slide out the keyboard, a NRE is throw by the Android Activity.
The stack trace of this exception is:
at Xamarin.Forms.NavigationProxy.set_Inner (INavigation value) [0x00000] in <filename unknown>:0
at Xamarin.Forms.Platform.Android.Platform.SetPage (Xamarin.Forms.Page newRoot) [0x00000] in <filename unknown>:0
at Xamarin.Forms.Platform.Android.AndroidActivity.SetPage (Xamarin.Forms.Page page) [0x00000] in <filename unknown>:0
at [Activity].OnCreate (Android.OS.Bundle bundle) [0x0001f] in [Activity]:[Line Number]
If two additional ConfigChanges are includes, this error does not come up. Adding these values fixes the problem:
"ConfigChange.Keyboard | ConfigChanges.KeyboardHidden"
I've attached a sample that shows the error. Page 1 exists outside of the Navigation Page and does not error out. After 10 seconds, it will transition to page 2 which is inside a NavigationPage and does cause the error.
I have tried to reproduce this issue but there is no attached sample.
Could you please attached the sample application and build information? So, that we can reproduce this issue.
You can get build information from here:
Visual Studio => Help => About Microsoft Visual Studio => Copy Info.
Microsoft Visual Studio Professional 2012
Version 11.0.61030.00 Update 4
Microsoft .NET Framework
Installed Version: Professional
Xamarin 188.8.131.52 (0b2a123923812a88ed3091909478dbe9e0111f00)
Thank you for taking the time to submit this report. After reviewing the description of this bug, we no longer believe it affects the current version of Xamarin.Forms. If you are still experiencing the issue after updating your packages, please reopen this report with an attached reproduction.
For your convenience, we have created some reproduction best practices viewable here: https://gist.github.com/jassmith/92405c300e54a01dcc6d
Xamarin Forms Team