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There's a bug in private method Android.Views.View.IOnFocusChangeListener.OnFocusChange(Android.Views.View v, bool hasFocus)
I have noticed that in the for loop the variable parent can be null at times causing a NullReferenceException.
for (Element parent = this.Element.Parent; !(parent is Page); parent = parent.Parent)
Only adding a null check would fix it I think:
for (Element parent = this.Element.Parent; parent != null && !(parent is Page); parent = parent.Parent)
Thank you for taking the time to submit the bug. We tried to reproduce the issue you reported but were unable given the description. If you could please attach a reproduction to the bug by starting with a clean Xamarin.Forms project and adding just the code necessary to demonstrate the issue we would very much appreciate it.
Xamarin Forms Team
I confirm this. This little sample fails:
public class App : Application
var page = new ContentPage();
var entry = new Entry();
page.Content = entry;
page.Appearing += (sender, args) =>
page.Content = null;
this.MainPage = page;
Created attachment 11540 [details]
See sergeys commenta and repro
Should be fixed in 1.4.3 final.
I have checked this issue with Xamarin.Forms.220.127.116.1164-pre3 and I am not getting any exception.
Hence closing this issue.