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Created attachment 14149 [details]
When trying to replace an entire page’s content after making a Picker selection, a NullReferenceException is thrown.
In the attached repro project, the current page’s content is being replaced when Picker.Unfocused is fired. This works on iOS, but an exception is thrown on Android.
### Steps to Reproduce
1. Run attach Android project
2. Select an item from the Picker
### Expected Results
After selecting an item, the tab page’s content will be replaced.
### Actual Results
A NullReferenceException is thrown as the Picker is closed.
### Environment Info
=== Xamarin Studio ===
Version 5.10.1 (build 3)
Installation UUID: 94ce5106-6a72-4691-b34e-cd5857b1db66
Mono 4.2.1 (explicit/6dd2d0d)
GTK+ 2.24.23 (Raleigh theme)
Package version: 402010102
=== Xamarin.Profiler ===
Location: /Applications/Xamarin Profiler.app/Contents/MacOS/Xamarin Profiler
=== Apple Developer Tools ===
Xcode 7.1.1 (9081)
=== Xamarin.iOS ===
Version: 188.8.131.52 (Business Edition)
Build date: 2015-12-01 02:12:30-0500
=== Xamarin.Mac ===
Version: 184.108.40.206 (Business Edition)
=== Xamarin.Android ===
Version: 220.127.116.11 (Business Edition)
Android SDK: /Users/jimmygarrido/Library/Developer/Xamarin/android-sdk-macosx
Supported Android versions:
2.3 (API level 10)
4.0.3 (API level 15)
4.1 (API level 16)
4.4 (API level 19)
5.0 (API level 21)
5.1 (API level 22)
6.0 (API level 23)
SDK Tools Version: 24.4.1
SDK Platform Tools Version: 23.0.1
SDK Build Tools Version: 22.0.1
Java SDK: /usr
java version "1.7.0_79"
Java(TM) SE Runtime Environment (build 1.7.0_79-b15)
Java HotSpot(TM) 64-Bit Server VM (build 24.79-b02, mixed mode)
=== Xamarin Android Player ===
Location: /Applications/Xamarin Android Player.app
=== Build Information ===
Release ID: 510010003
Git revision: f2021a209d66d49cbc0649a6d968b29040e57807
Build date: 2015-12-01 10:43:40-05
Xamarin addins: dfd4f5103e8951edbc8ac24480b53b53c55e04ff
Build lane: monodevelop-lion-cycle6-baseline
=== Operating System ===
Mac OS X 10.11.1
Darwin Jimmys-MacBook-Pro.local 15.0.0 Darwin Kernel Version 15.0.0
Sat Sep 19 15:53:46 PDT 2015
Stack trace: https://gist.github.com/jimmgarrido/7f8f7a7b2590e68772c8
This has been fixed in a recent version. Thanks!
Confirming that this has regressed in recent versions. I've updated the original gist with the new stack trace: https://gist.github.com/jimmgarrido/7f8f7a7b2590e68772c8
This only happens when using FormsApplicationActvity. It works without issue when using FormsAppCompatActivity which is the recommended approach now.
### Version Tests
This broke in 18.104.22.168 as a result of the fix for bug 42687.
Created PR for new fix: https://github.com/xamarin/Xamarin.Forms/pull/1132
Should be fixed on 2.4.1-pre1