xamarin/Xamarin.Forms

Picker control doesn't highlight the user selected item on Android

Open

#3,885 opened on Sep 24, 2018

View on GitHubContributor guide
 (8 comments) (4 reactions) (0 assignees)C# (1,926 forks)batch import
e/3 :clock3:help wantedinactivep/Androidt/bug :bug:up-for-grabs

Repository metrics

Stars
 (5,644 stars)
PR merge metrics
 (No merged PRs in 30d)

Description

Description

The Picker object doesn't highlight the user selected item on Android when it popup the list of items. This is mainly important when you have a large list of items.

Steps to Reproduce

  1. Add a picker to your main screen
  2. Fill-in the picker with 100 items (I used integers from 1 to 99)
  3. Start the demo project
  4. Select number "50" for example
  5. If you click once again on the picker, it will show the content starting from 1 instead of center the list on "50"

Expected Behavior

Picker should purpose user selected item as default item when it pupups

Actual Behavior

It doesn't highlight any of the item

Basic Information

  • Version with issue: Xamarin.Forms all versions
  • Last known good version: none
  • IDE: VS 2017
  • Platform Target Frameworks:
    • Android: all versions
  • Affected Devices: All devices

Screenshots

On Android NOT OK: picker_android

On iOS OK: picker_ios

On UWP OK: picker_uwp

Reproduction Link

TestPicker.zip

Contributor guide

Research direction
Examine the Android platform renderer for Picker control; verify that the selected item index is correctly passed to the native dialog and that the dialog scrolls to the selected item.
Tech stack
csharp
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
GitC#
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
65