xamarin/Xamarin.Forms

[Bug] ListView with RecycleElement truncates right aligned labels on Android

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#7,844 opened on Oct 6, 2019

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a/layouta/listviewe/4 :clock4:help wantedp/Androidt/bug :bug:up-for-grabs

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Description

Description

ListView with caching strategy RecycleElement and right aligned labels randomly truncates labels on Android after upgrade to XF 4.x

Steps to Reproduce

  1. Add a ListView with CachingStrategy=RecycleElement;
  2. Within DataTemplate use a label with HorizontalOptions=End;
  3. Add hundreds of items to the list and scroll up and down actively.

Using HorizontalTextAlignment=End resolves the issue but good to have HorizontalOptions=End fixed for consistency with iOS.

Expected Behavior

Labels are not truncated

Actual Behavior

Labels are randomly truncated

Basic Information

  • Version with issue: XF 4.x
  • Last known good version: XF 3.6.x
  • IDE: VS2019 16.3.2
  • Platform Target Frameworks:
    • Android: 10.0.0.43

Screenshots

Reproduction Link

https://github.com/VitalyKnyazev/LayoutIssue

Related issues #6297 and #6370

Contributor guide

Research direction
Investigate the layout logic in Xamarin.Forms Android renderer for ListView with RecycleElement. Focus on how Label with HorizontalOptions=End is measured and arranged. Compare with iOS behavior. Consider the interactions with the caching strategy that may affect measurement during scrolling.
Tech stack
csharpandroid
Domain
mobile
Issue type
Bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
2
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
C#Xamarin.FormsAndroid development
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
65