Bug 57876 - ViewCell containing ListView crashes on orientation change
Summary: ViewCell containing ListView crashes on orientation change
Status: RESOLVED ANSWERED
Alias: None
Product: Forms
Classification: Xamarin
Component: Android ()
Version: 2.3.4
Hardware: PC Windows
: --- normal
Target Milestone: ---
Assignee: Jimmy [MSFT]
URL:
Depends on:
Blocks:
 
Reported: 2017-06-30 10:33 UTC by Chad Magendanz
Modified: 2017-07-05 16:03 UTC (History)
2 users (show)

Tags: android listview tableview viewcell
Is this bug a regression?: ---
Last known good build:

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Status:
RESOLVED ANSWERED

Description Chad Magendanz 2017-06-30 10:33:52 UTC
When a ViewCell contains a ListView, for example in a hamburger menu which contains a list of recent projects as well as other menu commands, changing orientation will results in an unhanded exception.

To repo:
- Create new project in VS2017 using Cross Platform App (Xamarin) template
- Select Blank App and Shared Project
- In MainPage.xaml, substitute the following Content:

  <TableView>
    <TableRoot>
      <TableSection Title="User">
        <ImageCell ImageSource="Icon.png" Text="UserName" Detail="Email" />
      </TableSection>
      <TableSection Title="Recent Projects">
        <ViewCell>
          <ListView />
        </ViewCell>
      </TableSection>
    </TableRoot>
  </TableView>

Build and run Android project, then change orientation on device or emulator.

Result: Exception Unhandled (no call stack or exception details available because app is in break mode)

Populating ListView contents through binding in XAML or in codebehind doesn't seem to make a difference.
Comment 1 Jimmy [MSFT] 2017-07-05 16:03:12 UTC
I am seeing a crash at launch on Android when using the provided XAML, whether there are items or not in the ListView: https://gist.github.com/jimmgarrido/77d5beee5242a7bb2586cfbc95e758f5

Even though this appears to work on iOS and UWP, having a ListView inside a ViewCell is not something we recommend or support so you may encounter further issues by doing this.

I would suggest using a ListView and DataTemplateSelector[1] instead of a TableView. This way you can use a single ListView and still be able to provide a the list of recent items. Another approach might be to use a layout like StackLayout. When using this approach, avoid using a ScrollView if possible as there can be issues when using a ListView inside a ScrollView.

Hope this helps!

https://developer.xamarin.com/guides/xamarin-forms/application-fundamentals/templates/data-templates/selector/