Android 4.4.2 exception about xamarin-forms-carouselview

[chrisriesgo]

@amccorma - I'm having trouble replicating this issue. Do you have any additional steps that you can provide?

• Did you change any code?
• Are you testing on an emulator or real device?
• Are your Android SDKs + build tools up to date?

[e862]

Hi chrisriesgo,
I do have the same issue. The only thing I did to the original code was:
Install-Package Xamarin.Forms -Version 1.5.0.6447
It fails here: HomePage.cs, View CreateTabs(), pagerIndicator.SetBinding(PagerIndicatorTabs.ColumnDefinitionsProperty, "Pages", BindingMode.Default, new SpacingConverter());

I then fell back to
Install-Package Xamarin.Forms -Version 1.4.4.6449
with the same issue.

Only going back to the original version of Xamarin Forms
Install-Package Xamarin.Forms -Version 1.4.2.6359
worked.

Device: Samsung Galaxy S6, Factory reset, nothing installed
SDK: Android SDK 5.1.1 (API22)

Thanks, crisriesgo for looking into this. Maybe my findings help to point in the right direction.
And thanks for the code! :) e862

[amccorma]

It has been a long time since I looked at it. I reviewed my solution that fixed the issue. I did a workaround and forgot to post it.

In PagerIndicatorTabs.cs, change ItemsSourceChanged to:

void ItemsSourceChanged ()
{
if (ItemsSource == null) return;

this.ColumnDefinitions.Clear ();
foreach(var item in ItemsSource)
{
this.ColumnDefinitions.Add(new ColumnDefinition() { Width = new GridLength(1, GridUnitType.Star) });
}
CreateTabs();
}

In HomePage.cs change:

remove the binding for ColumnDefintions.

Xamarin.Forms.View CreateTabs()
{
var pagerIndicator = new PagerIndicatorTabs() { HorizontalOptions = LayoutOptions.CenterAndExpand };
pagerIndicator.RowDefinitions.Add(new RowDefinition() { Height = 50 });
pagerIndicator.SetBinding (PagerIndicatorTabs.ItemsSourceProperty, "Pages");
pagerIndicator.SetBinding (PagerIndicatorTabs.SelectedItemProperty, >"CurrentPage");
return pagerIndicator;
}

[e862]

Hi amccorma, and many thanks for quick response!
It works and it saved me quite some time. Greetings, e862

[Zilounay]

This solution works but the dots/tabs now don't update anymore when swiping. I tested on iOS.

[ionixjunior]

Thank you @amccorma your workaround works perfectly. Tested on Android API 22, iOS 8.4 and 9.2.

@Zilounay you need a help for solve this?

[amccorma]

Zilounay: the issue with the dots is the event handler (command is not attached to the button)

In PagerIndicatorTabs.cs find CreateTabs method. at the button create code attach the command:

            var tgr = new TapGestureRecognizer();
            tgr.Command = new Command(() =>
            {
                SelectedItem = ItemsSource[index];
            });
            tab.GestureRecognizers.Add(tgr);
            Children.Add(tab, index, 0);

[chrisriesgo]

Made some changes based on @amccorma's findings. Closing the issue.