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The following sample demonstrates a potential issue, where adding an item to a ListView will result in the item being inserted at an incorrect position, if the section is out of range of the view
# Steps to Reproduce
1. Download sample
2. Deploy to Android
3. Hit the add buttons in an alternating manner
4. Repeat step three until list is long enough to extend well beyond the view
5. Scroll to reveal out of view range items
# Expected Results
Scrolling down should reveal a continuation of the blue > yellow > blue > yellow pattern
# Actual Results
The pattern is interrupted, with yellow and blue repeating at differing intervals
Microsoft Visual Studio 2015
Version 14.0.24720.00 Update 1
Microsoft .NET Framework
Installed Version: Community
Visual Basic 2015 00322-20000-00000-AA067
Microsoft Visual Basic 2015
Visual C# 2015 00322-20000-00000-AA067
Microsoft Visual C# 2015
Visual C++ 2015 00322-20000-00000-AA067
Microsoft Visual C++ 2015
Visual F# 2015 00322-20000-00000-AA067
Microsoft Visual F# 2015
Application Insights Tools for Visual Studio Package 4.2.60128.3
Application Insights Tools for Visual Studio
Common Azure Tools 1.5
Provides common services for use by Azure Mobile Services and Microsoft Azure Tools.
JetBrains ReSharper Ultimate 10.0.2 Build 104.0.20151218.120627
JetBrains ReSharper Ultimate package for Microsoft Visual Studio. For more information about ReSharper Ultimate, visit http://www.jetbrains.com/resharper. Copyright © 2016 JetBrains, Inc.
Microsoft Azure Mobile Services Tools 1.4
Microsoft Azure Mobile Services Tools
NuGet Package Manager 3.3.0
NuGet Package Manager in Visual Studio. For more information about NuGet, visit http://docs.nuget.org/.
PreEmptive Analytics Visualizer 1.2
Microsoft Visual Studio extension to visualize aggregated summaries from the PreEmptive Analytics product.
TypeScript for Microsoft Visual Studio
Visual Studio Tools for Universal Windows Apps 14.0.24720.00
The Visual Studio Tools for Universal Windows apps allow you to build a single universal app experience that can reach every device running Windows 10: phone, tablet, PC, and more. It includes the Microsoft Windows 10 Software Development Kit.
Xamarin 188.8.131.52 (f869dba)
Visual Studio extension to enable development for Xamarin.iOS and Xamarin.Android.
Xamarin.Android 184.108.40.206 (46c3f7e)
Visual Studio plugin to enable development for Xamarin.Android.
Xamarin.iOS 220.127.116.11 (49ba15e)
Visual Studio extension to enable development for Xamarin.iOS.
Created attachment 15289 [details]
This does not happen on modern versions of Forms.
Modern suggests that we are using an very old version.
But we are using Xamarin.Forms 18.104.22.16846 from 09/16/2015 (when we started developing our app).
Please suggest a stable Xamarin (Forms) version where this problem is working.
Attached is a new sample, updated to 2.1.x of Xamarin.Forms. The issue occurs in this sample as well.
Created attachment 15429 [details]
MyImageRenderer is not updating MyImageView with the new Element when OnElementChanged is called during re-use, so when re-use happens its retaining the old image. Effectively this renderer doesn't re-use correctly
Please provide an corrected example of the OnElementChanged method.
I'm not sure what you mean with 're-use'. Do you mean it has something to do with Caching: