Telerik.UI.for.Xamarin version 2018.1.405.2

Platform: Android

 

I'm creating a custom Xamarin.Forms control that embeds `RadListView` (2017.3.1123.0). Everything works fine on iOS but when I try to interact with the list on Android (taps, swipes) it throws an exception:



My Droid project references all the assemblies described in your documentation: Telerik.Xamarin.Android.Common, Telerik.Xamarin.Android.Data, Telerik.Xamarin.Android.Input, Telerik.Xamarin.Android.List, Telerik.Xamarin.Android.Primitives, Telerik.XamarinForms.Common, Telerik.XamarinForms.DataControls.

Here is the code of the custom control:



using System;
using System.Collections;
using System.Diagnostics;
using System.Windows.Input;
using MyMd.Mobile.Core.Mvvm.Extensions;
using MyMd.Mobile.Core.Utilities;
using Xamarin.Forms;

namespace MyMd.Mobile.Core.Controls
{
    public partial class MdListView
    {
        private const double SwipeThreshold = 30;

        public static readonly BindableProperty ItemsProperty = BindableProperty.Create(nameof(Items), typeof(IEnumerable), typeof(MdListView),
            propertyChanged: ItemsChanged);

        public static readonly BindableProperty IsLoadingProperty = BindableProperty.Create(nameof(IsLoading), typeof(bool), typeof(MdListView), false);

        public static readonly BindableProperty ItemTappedCommandProperty = BindableProperty.Create(nameof(ItemTappedCommand), typeof(ICommand), typeof(MdListView),
            propertyChanged: ItemTappedCommandChanged);

        public static readonly BindableProperty DeleteCommandProperty = BindableProperty.Create(nameof(DeleteCommand), typeof(ICommand), typeof(MdListView),
            propertyChanged: DeleteCommandChanged);

        public static readonly BindableProperty ListItemTemplateSelectorProperty = BindableProperty.Create(nameof(ListItemTemplateSelector),
            typeof(DataTemplateSelector), typeof(MdListView));

        public IEnumerable Items
        {
            get => (IEnumerable) GetValue(ItemsProperty);
            set => SetValue(ItemsProperty, value);
        }

        public bool IsLoading
        {
            get => (bool) GetValue(IsLoadingProperty);
            set => SetValue(IsLoadingProperty, value);
        }

        public ICommand ItemTappedCommand
        {
            get => (ICommand) GetValue(ItemTappedCommandProperty);
            set => SetValue(ItemTappedCommandProperty, value);
        }

        public ICommand DeleteCommand
        {
            get => (ICommand) GetValue(ItemTappedCommandProperty);
            set => SetValue(ItemTappedCommandProperty, value);
        }

        public DataTemplateSelector ListItemTemplateSelector
        {
            get => (DataTemplateSelector) GetValue(ListItemTemplateSelectorProperty);
            set => SetValue(ListItemTemplateSelectorProperty, value);
        }

        public string ListDescription { get; set; }
        public string EmptyListText { get; set; } = Properties.Resources.EmptyList;
        public Style ListStyle { get; set; }
        public DataTemplate ListItemTemplate { get; set; }
        public View Footer { get; set; }

        private bool _isEmpty;
        public bool IsEmpty
        {
            get => _isEmpty;
            set
            {
                _isEmpty = value;
                OnPropertyChanged(nameof(IsEmpty));
            }
        }

        public MdListView()
        {
            InitializeComponent();
        }

        private static void ItemsChanged(BindableObject bindable, object oldItems, object newItems)
        {
            if (newItems == oldItems || !(newItems is IEnumerable items))
                return;

            var listView = (MdListView) bindable;

            listView.IsEmpty = items.IsEmpty();
        }

        private static void ItemTappedCommandChanged(BindableObject bindable, object oldCommand, object newCommand)
        {
            if (!(newCommand is ICommand command))
                return;

            var listView = (MdListView) bindable;

            listView.InternalList.ItemTapped += (sender, args) => command.Execute(args.Item);
        }

        private static void DeleteCommandChanged(BindableObject bindable, object oldCommand, object newCommand)
        {
            if (!(newCommand is ICommand command))
                return;

            var listView = (MdListView) bindable;

            listView.InternalList.IsItemSwipeEnabled = true;
            listView.InternalList.SwipeThreshold = SwipeThreshold;
            listView.InternalList.SwipeOffset = new Thickness(0, 0, SwipeThreshold * 2, 0);

            listView.InternalList.ItemSwipeContentTemplate = new DataTemplate(() =>
            {
                var container = new Grid
                {
                    Style = listView.FindResource<Style>("MdListView.SwipeContentContainerStyle")
                };

                container.ColumnDefinitions.Add(new ColumnDefinition { Width = new GridLength(1, GridUnitType.Star) });
                container.ColumnDefinitions.Add(new ColumnDefinition { Width = new GridLength(SwipeThreshold * 2, GridUnitType.Absolute)});
                container.RowDefinitions.Add(new RowDefinition { Height = new GridLength(1, GridUnitType.Star)});

                var deleteButton = new TappableImage
                {
                    Style = listView.FindResource<Style>("MdListView.DeleteButtonStyle"),
                    Source = listView.FindImageSourceResouce("Image.Delete"),
                    TappedCommand = command
                };

                container.Children.Add(deleteButton, 1, 0);

                return container;
            });
        }
    }
}

Any clues what might be wrong?

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C:\Program Files (x86)\Microsoft Visual Studio\2017\Professional\MSBuild\Xamarin\Android\Xamarin.Android.Common.targets(1812,5):
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 in assembly: 'Telerik.XamarinForms.DataGrid.dll' ---> Mono.Cecil.ResolutionException: Failed to resolve System.Func`2<System.String,System.String> Xamarin.Forms.Internals.ResourceLoader::get_ResourceProvider()

Possibly related to today's Visual Studio update 15.7.2.

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Any thoughts?

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I am using Xamarin.Forms, Visual Studio with the latest version of Telerik.

Stay away from Visual Studio update 15.7.2, it is a project killer. Anyone have any ideas how to fix this?

 

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Thanks,
Stavros 

 

 

Hi all,

I use a very simple RadRadialGauge, when I run in debug my app everything is ok, but when I start it in release mode, I cannot see anything on  real device, heres the code:
<telerikGauges:RadRadialGauge StartAngle="90" Margin="0" SweepAngle="360" HorizontalOptions="FillAndExpand" Padding="0" VerticalOptions="FillAndExpand" >
                                <telerikGauges:RadRadialGauge.Axis>
                                    <telerikGauges:GaugeLinearAxis Maximum="1"   
                                                       Minimum="0"
                                                       ShowLabels="False"
                                                       StrokeThickness="0" />
                                </telerikGauges:RadRadialGauge.Axis>
                                <telerikGauges:RadRadialGauge.Ranges>
                                    <telerikGauges:GaugeRangesDefinition Offset="0">
                                        <telerikGauges:GaugeRange Color="{StaticResource YukoLightBlue}"
                                                      From="0"                                                               
                                                      To="1" />
                                    </telerikGauges:GaugeRangesDefinition>
                                </telerikGauges:RadRadialGauge.Ranges>
                                <telerikGauges:RadRadialGauge.Indicators>                                    
                                    <telerikGauges:GaugeRangeBarIndicator Fill="{StaticResource YukoForceDarkBlue}"
                                                              FromCap="ConcaveOval"
                                                              ToCap="Oval"
                                                              Offset="0"
                                                              From="0"                                                             
                                                              To="0.45" />
                                </telerikGauges:RadRadialGauge.Indicators>
                            </telerikGauges:RadRadialGauge>

Any helps is appreciated.

 

Thanks

 

Alessio