Description

ItemSelected (and ItemTapped) is not called on a listview, if it has label with TapGestureRecognizer:

<ListView.ItemTemplate>
<DataTemplate>
<ViewCell>
......
<Label1>
<Label2>
......
<LabelX>
<LabelX.GestureRecognizers>
<TapGestureRecognizer Tapped="OnLabelXClick" CommandParameter="{Binding .}"/>
</LabelX.GestureRecognizers>

Tapped 'OnLabelXClick' event is called on the LabelX, but the ItemSelected/ItemTapped event is not called in the ListView if you click outside of LabelX position.

This used to work in Xamarin.Forms.2.5.0.122203 (but with other issue: #1331 ), but after upgrading to Xamarin.Forms.3.0.0.296286-pre2, ItemSelected/ItemTapped is not called.

This is only on Android. On iOS, works fine.
Might be related to this fix: #1331

Steps to Reproduce

Expected Behavior

If you click on a list item:
-click on the label with TapGestureRecognizer: Tapped function is called [this works]
-click on other place of the item in the list: ItemSelected/ItemTapped event triggered [this does NOT work]

Actual Behavior

If you click on a list item:
-click on the label with TapGestureRecognizer: Tapped function is called
-click on other place of the item in the list: ItemSelected/ItemTapped event is NOT triggered

Basic Information

ListViewBug.zip

Sample attached to reproduce.

If you run, and you click on any list item (outside of text1 label), you can see that the "OnItemSelected" is not called,

If you remove the <Label.GestureRecognizers> from the ListViewBug\MainPage.xaml , "OnItemSelected" is called properly.

I am having the same issue when using Xamarin.Forms 2.5.1.392594-pre3.
Removing the GestureRecognizer from a child Grid inside the ItemTemplate ViewCell worked to get the OnItemSelected called.

This is only occurring on Android. It works fine on iOS targeting iOS 11.2.
IDE: VS2017 15.6.4

Will this be fixed in a new version for Xamarin.Forms 2.5.1? That would be great! Because XF 3.0 requires VS 2017 ...

[offtopic]
I find it funny, that a fix for a bug introduces a new bug. Including a ListView_ItemTapped method would immediately show that error in the Github1331 project.

The issue is reported two months ago and since then the fix isn't planned nor the issue solved. The origin issue is here since six months! Xamarin.Forms seems still not be really useful for productive environments ...
[/offtopic]

Normally, if user taps on view which has TapGestureRecognizer, that should be called.
Otherwise, if user taps on view which has NO TapGestureRecognizer / or taps outside of any view within the item, then ItemSelected/ItemTapped should be called.

Other idea could be that ItemTapped event receives the tapped view as param (which is NULL if tapped on "empty" area). This case, no need for TapGestureRecognizer.

I've got a few TapGestureRecognizers within a viewcell, they can co-exist.

On iOS, everything works - tapping viewcell will invoke "ItemSelected" and tapping on the GestureRecognizers will invoke the various commands.

On Android, only the GestureRecognizers work, the viewcell "ItemSelected" no longer functions.

Both iOS and Android were working on XF 2.5. I upgraded to 3.1.0 last night and after testing that's the one thing that doesn't work on Android.

Confirming that this issue still exists in 3.1.0.697729. I didn't have any luck with effects. So I added an image to my viewcell with a Image.tapGesture and removed the ViewCell.ContextActions. This had the ItemSelected work again and the tap gesture on the image works. Maybe that will help someone.

OK no problem. I'll try to explain it all here.

Since the ListView is working with iOS, I didn't want to modify that to have to work with long / short press and keep the swipe mechanism so for that I created two DataTemplates, one for iOS and one for Android:

https://docs.microsoft.com/en-us/xamarin/xamarin-forms/app-fundamentals/templates/data-templates/creating

The following line will choose which template to use based on the platform....

<local:PlatformSelector x:Key="PlatformSelector" isPlatformiOS="{StaticResource iOSPlatformTemplate}" isPlatformAndroid="{StaticResource AndroidPlatformTemplate}" />

and on the ListView itself...

<ListView ItemTemplate="{StaticResource PlatformSelector}" ... >

code behind:

    public class PlatformSelector : DataTemplateSelector
        public DataTemplate isPlatformiOS { get; set; }
        public DataTemplate isPlatformAndroid { get; set; }
        protected override DataTemplate OnSelectTemplate(object item, BindableObject container)
            return Device.RuntimePlatform.Equals(Device.iOS) ? isPlatformiOS : isPlatformAndroid;
On the Android ListView viewcell I had a StackLayout and attached the effect:
                                <StackLayout.Effects>
                                     <effects:LongPressedEffect/>
                                </StackLayout.Effects>
The code for effect, I used this example:
https://alexdunn.org/2017/12/27/xamarin-tip-xamarin-forms-long-press-effect/
and code from here: https://github.com/lywyn/LongPressedTestApp
If you're stuck, give me a shout.
          
For me, the ItemSelected/ItemTapped is not called in listview if an item view has TapGestureRecognizer and ContextActions. Xamarin.Forms 3.3.0.912540
I'm adding a repro project
FastScroll.zip
  MJunak, IgorKravchenko10, DennisWelu, RanKarat, and joseluisct reacted with thumbs up emoji
  hartez and joseluisct reacted with hooray emoji
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For me, the ItemSelected/ItemTapped is not called in listview if an item view has TapGestureRecognizer and ContextActions. Xamarin.Forms 3.3.0.912540
I'm adding a repro project
FastScroll.zip
I have same issue https://forums.xamarin.com/discussion/145672/listview-itemselected-and-itemtapped-not-working-with-contextactions/
      [Bug] GestureRecognizer inside ListView with ViewCell.ContextActions breaks the ListView ItemSelected Event ( Android Only )
      #6386
  up-for-grabs
  We welcome community contributions to any issue, but these might be a good place to start!
  labels
      Jul 2, 2019
          
I have a reproduction case for this issue: A ListView containing items that have a gesture recognizer as well as a context action. In this case, the ItemTapped event is never called:

https://gist.github.com/vividos/d2819d8e3890413593c04e9d622ceee8

Add this file to the Xamarin.Forms.Controls.Issues.Shared project and start the Xamarin.Forms.ControlGallery.Android project.

I hope this helps to find and fix the issue.
    help wanted
  We welcome community contributions to any issue, but these might be a good place to start!
    m/high impact ⬛
    p/Android
    t/bug 🐛
    up-for-grabs
  We welcome community contributions to any issue, but these might be a good place to start!