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Put a Xamarin.Forms.Image inside a ViewCel within a DataTemplate.
Assign the datatemplate containing the Image to a ListView's ItemTemplate.
Bind the Image's Source property to a .png byte array in a viewmodel, using a value converter that converts the byte array to an ImageSource.
Bind the ListView's ItemsSource to an observable collection of image viewmodels. The viewmodels are created only once for the duration of the app and the image byte arrays within are loaded once into memory and do not change.
Put the ListView on a ContentPage and repeatedly navigate to that ContentPage and back.
--> Observe how the ListView renders the images inconsistently:
-sometimes it duplicates an image in multiple rows
-sometimes it does not render one or more of the images at all
-sometimes it renders the images successively on top of each other in rapid succession
reproduced on Android Emulator 4.1, Galaxy Note 3
Created attachment 8279 [details]
repro case solution
Note: this is on Android! IOS/WP was not tested.
I have checked this issue and able to reproduce this issue. To reproduce this issue I have followed the sample application and instruction provided in bug description.
Steps to reproduce:
1. Open attached sample application in VS
2. Build the application it will build successfully
3. Deploy the application on simulator, it deploy successfully
5. It will show message and instruction with button
4. Click on Button and Repeatedly navigate to that ContentPage and back
5. Observe How the ListView renders the images inconsistently:
a.Sometimes it duplicates an image in multiple rows
b.Sometimes it does not render one or more of the images at all
c.Sometimes it renders the images successively on top of each other in rapid succession
Additional Information: Getting same behavior on device too (Samsung Galaxy s4).
Microsoft Visual Studio Professional 2012
Version 11.0.50727.1 RTMREL
Microsoft .NET Framework
Installed Version: Professional
LightSwitch for Visual Studio 2012 04938-004-0033001-02367
Microsoft LightSwitch for Visual Studio 2012
Office Developer Tools 04938-004-0033001-02367
Microsoft Office Developer Tools
Team Explorer for Visual Studio 2012 04938-004-0033001-02367
Microsoft Team Explorer for Visual Studio 2012
Visual Basic 2012 04938-004-0033001-02367
Microsoft Visual Basic 2012
Visual C# 2012 04938-004-0033001-02367
Microsoft Visual C# 2012
Visual C++ 2012 04938-004-0033001-02367
Microsoft Visual C++ 2012
Visual F# 2012 04938-004-0033001-02367
Microsoft Visual F# 2012
Visual Studio 2012 Code Analysis Spell Checker 04938-004-0033001-02367
Microsoft® Visual Studio® 2012 Code Analysis Spell Checker
Portions of International CorrectSpell™ spelling correction system © 1993 by Lernout & Hauspie Speech Products N.V. All rights reserved.
The American Heritage® Dictionary of the English Language, Third Edition Copyright © 1992 Houghton Mifflin Company. Electronic version licensed from Lernout & Hauspie Speech Products N.V. All rights reserved.
Visual Studio 2012 SharePoint Developer Tools 04938-004-0033001-02367
Microsoft Visual Studio 2012 SharePoint Developer Tools
Microsoft Advertising SDK for Windows Phone
Microsoft Advertising SDK for Windows Phone
NuGet Package Manager 2.0.30625.9003
NuGet Package Manager in Visual Studio. For more information about NuGet, visit http://docs.nuget.org/.
PreEmptive Analytics Visualizer 1.0
Microsoft Visual Studio extension to visualize aggregated summaries from the PreEmptive Analytics product.
SQL Server Data Tools 11.1.20627.00
Microsoft SQL Server Data Tools
Web Developer Tools 1.0.30710.0
Microsoft Web Developer Tools contains the following components:
Page Inspector: Tool that offers an efficient way to decompose Web Applications and diagnose front-end issues.
Web Publishing: Extensions required for Web Publishing for both hosted servers as well as on premises.
Web Form Templates: Includes the default templates for Web Form Applications.
Editor Extensions: Includes HTML, CSS, and JS editor extensions that greatly enhance the development experience.
Workflow Manager Tools 1.0 1.0
This package contains the necessary Visual Studio integration components for Workflow Manager.
Xamarin 3.6.262.0 (21b7dba8736246dfd10e3f19a92ed68f1b30abfd)
Visual Studio extension to enable development for Xamarin.iOS and Xamarin.Android.
Xamarin.Android 18.104.22.168 (2a7b68212b17c903160fbd8e0106babb299d1be3)
Visual Studio plugin to enable development for Xamarin.Android.
Xamarin.iOS 22.214.171.124 (3e201c8aa14879773f966f483329bcda49fd3a41)
Visual Studio extension to enable development for Xamarin.iOS.
Fixed in 1.3.0-pre1 (not released yet)
A customer experiencing this issue has indicated that implementing an image cache and loading the images from file with:
Allows him to work around the issue. This should be useful to those hitting the error while we're waiting for the release of 1.3.0.