xamarin/Xamarin.Forms

[Bug] CollectionView not properly capturing Touch actions on Android

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#7,159 opened on Aug 14, 2019

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a/collectionviewa/gestures 🖖a/listviewe/4 :clock4:help wantedt/bug :bug:up-for-grabs

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Description

Description

I've implemented an effect to capture touch events on a CollectionView, however, the MotionEvent ACTION_DOWN doesn't seem to be captured on Android. The MotionEvent ACTION_MOVE is properly being captured. I've tested this effect on other views with no issues. I've followed this link for creating the effect.

Steps to Reproduce

Touch down on CollectionView, without sliding.

Expected Behavior

Should fire the view's Touch event

Actual Behavior

Touch event is not fired on ACTION_DOWN

Basic Information

  • Version with issue: 4.2..673161-pre3
  • Last known good version: unknown
  • IDE: VS Mac 8.3 Preview build 1290
  • Platform Target Frameworks:
    • Android: API Level 28

Reproduction Link

CollectionViewTouchBug.zip

Contributor guide

Research direction
Inspect the CollectionView's Android renderer touch handling. Look at how Touch events are dispatched in CollectionViewRenderer and compare with other views.
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
Git
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
50