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?
Java.Lang.NoClassDefFoundError: Failed resolution of: Lcom/telerik/widget/list/R$id; ---> Java.Lang.ClassNotFoundException: Didn't find class "com.telerik.widget.list.R$id" on path: DexPathList[[zip file "/data/app/com.example.app-1/base.apk"],nativeLibraryDirectories=[/data/app/com.example.app-1/lib/x86_64, /data/app/com.example.app-1/base.apk!/lib/x86_64, /vendor/lib64, /system/lib64]] at java.lang.ClassNotFoundException: Didn't find class "com.telerik.widget.list.R$id" on path: DexPathList[[zip file "/data/app/com.example.app-1/base.apk"],nativeLibraryDirectories=[/data/app/com.example.app-1/lib/x86_64, /data/app/com.example.app-1/base.apk!/lib/x86_64, /vendor/lib64, /system/lib64]] at at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:56) at at java.lang.ClassLoader.loadClass(ClassLoader.java:511) at at java.lang.ClassLoader.loadClass(ClassLoader.java:469) at at com.telerik.widget.list.RadListView.trySetHotspot(RadListView.java:663) at at com.telerik.widget.list.RadListView.notifyOnDown(RadListView.java:655) at at com.telerik.widget.list.ListViewGestureListener.onTouchEvent(ListViewGestureListener.java:61) at at com.telerik.widget.list.RadListView.onTouchEvent(RadListView.java:518) at at android.view.View.dispatchTouchEvent(View.java:9294) at at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2547) at at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2240) at at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2553) at at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2197) at at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2553) at at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2197) at at md5b60ffeb829f638581ab2bb9b1a7f4f3f.VisualElementRenderer_1.n_dispatchTouchEvent(Native Method) at at md5b60ffeb829f638581ab2bb9b1a7f4f3f.VisualElementRenderer_1.dispatchTouchEvent(VisualElementRenderer_1.java:64) at at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2553) at at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2197) at at md5b60ffeb829f638581ab2bb9b1a7f4f3f.Platform_DefaultRenderer.n_dispatchTouchEvent(Native Method) at at md5b60ffeb829f638581ab2bb9b1a7f4f3f.Platform_DefaultRenderer.dispatchTouchEvent(Platform_DefaultRenderer.java:54) at at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2553) at at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2197) at at md5b60ffeb829f638581ab2bb9b1a7f4f3f.Platform_DefaultRenderer.n_dispatchTouchEvent(Native Method) at at md5b60ffeb829f638581ab2bb9b1a7f4f3f.Platform_DefaultRenderer.dispatchTouchEvent(Platform_DefaultRenderer.java:54) at at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2553) at at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2197) at at md5b60ffeb829f638581ab2bb9b1a7f4f3f.Platform_DefaultRenderer.n_dispatchTouchEvent(Native Method) at at md5b60ffeb829f638581ab2bb9b1a7f4f3f.Platform_DefaultRenderer.dispatchTouchEvent(Platform_DefaultRenderer.java:54) at at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2553) at at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2197) at at md5b60ffeb829f638581ab2bb9b1a7f4f3f.VisualElementRenderer_1.n_dispatchTouchEvent(Native Method) at at md5b60ffeb829f638581ab2bb9b1a7f4f3f.VisualElementRenderer_1.dispatchTouchEvent(VisualElementRenderer_1.java:64) at at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2553) at at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2197) at at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2553) at at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2197) at at md5b60ffeb829f638581ab2bb9b1a7f4f3f.VisualElementRenderer_1.n_dispatchTouchEvent(Native Method) at at md5b60ffeb829f638581ab2bb9b1a7f4f3f.VisualElementRenderer_1.dispatchTouchEvent(VisualElementRenderer_1.java:64) at at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2553) at at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2197) at at md5b60ffeb829f638581ab2bb9b1a7f4f3f.PlatformRenderer.n_dispatchTouchEvent(Native Method) at at md5b60ffeb829f638581ab2bb9b1a7f4f3f.PlatformRenderer.dispatchTouchEvent(PlatformRenderer.java:55) at at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2553) at at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2197) at at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2553) at at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2197) at at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2553) at at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2197) at at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2553) at at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2197) at at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2553) at at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2197) at at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2553) at at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2197) at at com.android.internal.policy.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:2403) at at com.android.internal.policy.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1737) at at android.app.Activity.dispatchTouchEvent(Activity.java:2765) at at android.support.v7.view.WindowCallbackWrapper.dispatchTouchEvent(WindowCallbackWrapper.java:71) at at android.support.v7.view.WindowCallbackWrapper.dispatchTouchEvent(WindowCallbackWrapper.java:71) at at com.android.internal.policy.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:2364) at at android.view.View.dispatchPointerEvent(View.java:9514) at at android.view.ViewRootImpl$ViewPostImeInputStage.processPointerEvent(ViewRootImpl.java:4230) at at android.view.ViewRootImpl$ViewPostImeInputStage.onProcess(ViewRootImpl.java:4096) at at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3642) at at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:3695) at at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3661) at at android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:3787) at at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:3669) at at android.view.ViewRootImpl$AsyncInputStage.apply(ViewRootImpl.java:3844) at at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3642) at at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:3695) at at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3661) at at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:3669) at at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3642) at at android.view.ViewRootImpl.deliverInputEvent(ViewRootImpl.java:5922) at at android.view.ViewRootImpl.doProcessInputEvents(ViewRootImpl.java:5896) at at android.view.ViewRootImpl.enqueueInputEvent(ViewRootImpl.java:5857) at at android.view.ViewRootImpl$WindowInputEventReceiver.onInputEvent(ViewRootImpl.java:6025) at at android.view.InputEventReceiver.dispatchInputEvent(InputEventReceiver.java:185) at at android.os.MessageQueue.nativePollOnce(Native Method) at at android.os.MessageQueue.next(MessageQueue.java:323) at at android.os.Looper.loop(Looper.java:135) at at android.app.ActivityThread.main(ActivityThread.java:5417) at at java.lang.reflect.Method.invoke(Native Method) at at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726) at at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616) at Suppressed: java.lang.ClassNotFoundException: com.telerik.widget.list.R$id at at java.lang.Class.classForName(Native Method) at at java.lang.BootClassLoader.findClass(ClassLoader.java:781) at at java.lang.BootClassLoader.loadClass(ClassLoader.java:841) at at java.lang.ClassLoader.loadClass(ClassLoader.java:504) at ... 84 more at Caused by: java.lang.NoClassDefFoundError: Class not found using the boot class loader; no stack trace available --- End of inner exception stack trace --- at java.lang.NoClassDefFoundError: Failed resolution of: Lcom/telerik/widget/list/R$id; at at com.telerik.widget.list.RadListView.trySetHotspot(RadListView.java:663) at at com.telerik.widget.list.RadListView.notifyOnDown(RadListView.java:655) at at com.telerik.widget.list.ListViewGestureListener.onTouchEvent(ListViewGestureListener.java:61) at at com.telerik.widget.list.RadListView.onTouchEvent(RadListView.java:518) at at android.view.View.dispatchTouchEvent(View.java:9294) at at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2547) at at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2240) at at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2553) at at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2197) at at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2553) at at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2197) at at md5b60ffeb829f638581ab2bb9b1a7f4f3f.VisualElementRenderer_1.n_dispatchTouchEvent(Native Method) at at md5b60ffeb829f638581ab2bb9b1a7f4f3f.VisualElementRenderer_1.dispatchTouchEvent(VisualElementRenderer_1.java:64) at at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2553) at at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2197) at at md5b60ffeb829f638581ab2bb9b1a7f4f3f.Platform_DefaultRenderer.n_dispatchTouchEvent(Native Method) at at md5b60ffeb829f638581ab2bb9b1a7f4f3f.Platform_DefaultRenderer.dispatchTouchEvent(Platform_DefaultRenderer.java:54) at at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2553) at at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2197) at at md5b60ffeb829f638581ab2bb9b1a7f4f3f.Platform_DefaultRenderer.n_dispatchTouchEvent(Native Method) at at md5b60ffeb829f638581ab2bb9b1a7f4f3f.Platform_DefaultRenderer.dispatchTouchEvent(Platform_DefaultRenderer.java:54) at at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2553) at at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2197) at at md5b60ffeb829f638581ab2bb9b1a7f4f3f.Platform_DefaultRenderer.n_dispatchTouchEvent(Native Method) at at md5b60ffeb829f638581ab2bb9b1a7f4f3f.Platform_DefaultRenderer.dispatchTouchEvent(Platform_DefaultRenderer.java:54) at at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2553) at at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2197) at at md5b60ffeb829f638581ab2bb9b1a7f4f3f.VisualElementRenderer_1.n_dispatchTouchEvent(Native Method) at at md5b60ffeb829f638581ab2bb9b1a7f4f3f.VisualElementRenderer_1.dispatchTouchEvent(VisualElementRenderer_1.java:64) at at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2553) at at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2197) at at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2553) at at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2197) at at md5b60ffeb829f638581ab2bb9b1a7f4f3f.VisualElementRenderer_1.n_dispatchTouchEvent(Native Method) at at md5b60ffeb829f638581ab2bb9b1a7f4f3f.VisualElementRenderer_1.dispatchTouchEvent(VisualElementRenderer_1.java:64) at at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2553) at at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2197) at at md5b60ffeb829f638581ab2bb9b1a7f4f3f.PlatformRenderer.n_dispatchTouchEvent(Native Method) at at md5b60ffeb829f638581ab2bb9b1a7f4f3f.PlatformRenderer.dispatchTouchEvent(PlatformRenderer.java:55) at at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2553) at at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2197) at at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2553) at at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2197) at at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2553) at at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2197) at at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2553) at at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2197) at at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2553) at at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2197) at at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2553) at at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2197) at at com.android.internal.policy.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:2403) at at com.android.internal.policy.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1737) at at android.app.Activity.dispatchTouchEvent(Activity.java:2765) at at android.support.v7.view.WindowCallbackWrapper.dispatchTouchEvent(WindowCallbackWrapper.java:71) at at android.support.v7.view.WindowCallbackWrapper.dispatchTouchEvent(WindowCallbackWrapper.java:71) at at com.android.internal.policy.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:2364) at at android.view.View.dispatchPointerEvent(View.java:9514) at at android.view.ViewRootImpl$ViewPostImeInputStage.processPointerEvent(ViewRootImpl.java:4230) at at android.view.ViewRootImpl$ViewPostImeInputStage.onProcess(ViewRootImpl.java:4096) at at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3642) at at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:3695) at at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3661) at at android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:3787) at at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:3669) at at android.view.ViewRootImpl$AsyncInputStage.apply(ViewRootImpl.java:3844) at at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3642) at at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:3695) at at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3661) at at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:3669) at at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3642) at at android.view.ViewRootImpl.deliverInputEvent(ViewRootImpl.java:5922) at at android.view.ViewRootImpl.doProcessInputEvents(ViewRootImpl.java:5896) at at android.view.ViewRootImpl.enqueueInputEvent(ViewRootImpl.java:5857) at at android.view.ViewRootImpl$WindowInputEventReceiver.onInputEvent(ViewRootImpl.java:6025) at at android.view.InputEventReceiver.dispatchInputEvent(InputEventReceiver.java:185) at at android.os.MessageQueue.nativePollOnce(Native Method) at at android.os.MessageQueue.next(MessageQueue.java:323) at at android.os.Looper.loop(Looper.java:135) at at android.app.ActivityThread.main(ActivityThread.java:5417) at at java.lang.reflect.Method.invoke(Native Method) at at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726) at at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616) at Caused by: java.lang.ClassNotFoundException: Didn't find class "com.telerik.widget.list.R$id" on path: DexPathList[[zip file "/data/app/com.example.app-1/base.apk"],nativeLibraryDirectories=[/data/app/com.example.app-1/lib/x86_64, /data/app/com.example.app-1/base.apk!/lib/x86_64, /vendor/lib64, /system/lib64]] at at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:56) at at java.lang.ClassLoader.loadClass(ClassLoader.java:511) at at java.lang.ClassLoader.loadClass(ClassLoader.java:469) at ... 83 more at Suppressed: java.lang.ClassNotFoundException: com.telerik.widget.list.R$id at at java.lang.Class.classForName(Native Method) at at java.lang.BootClassLoader.findClass(ClassLoader.java:781) at at java.lang.BootClassLoader.loadClass(ClassLoader.java:841) at at java.lang.ClassLoader.loadClass(ClassLoader.java:504) at ... 84 more at Caused by: java.lang.NoClassDefFoundError: Class not found using the boot class loader; no stack trace availableMy 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:
<?xml version="1.0" encoding="UTF-8"?><StackLayout xmlns="http://xamarin.com/schemas/2014/forms" xmlns:dataControls="clr-namespace:Telerik.XamarinForms.DataControls;assembly=Telerik.XamarinForms.DataControls" x:Class="MyMd.Mobile.Core.Controls.MdListView" x:Name="MdListViewControl" Spacing="0" VerticalOptions="FillAndExpand"> <!-- ... --> <Label IsVisible="{Binding IsEmpty, Source={x:Reference MdListViewControl}}" Text="{Binding EmptyListText, Source={x:Reference MdListViewControl}}" Style="{StaticResource PageMessageStyle}" /> <Label IsVisible="{Binding IsEmpty, Source={x:Reference MdListViewControl}, Converter={StaticResource NegationConverter}}" Text="{Binding ListDescription, Source={x:Reference MdListViewControl}}" Style="{StaticResource PageMessageStyle}" Margin="15, 0, 15, 15" /> <StackLayout Style="{StaticResource MainContainerBaseStyle}"> <ContentView IsVisible="{Binding IsLoading, Source={x:Reference MdListViewControl}}" VerticalOptions="FillAndExpand" HorizontalOptions="FillAndExpand"> <ActivityIndicator IsRunning="{Binding IsLoading, Source={x:Reference MdListViewControl}}" VerticalOptions="Center" HorizontalOptions="Center" /> </ContentView> <dataControls:RadListView x:Name="InternalList" ItemsSource="{Binding Items, Source={x:Reference MdListViewControl}}" Style="{Binding ListStyle, Source={x:Reference MdListViewControl}}" IsVisible="{Binding IsEmpty, Source={x:Reference MdListViewControl}, Converter={StaticResource NegationConverter}}" ItemTemplate="{Binding ListItemTemplate, Source={x:Reference MdListViewControl}}" ItemTemplateSelector="{Binding ListItemTemplateSelector, Source={x:Reference MdListViewControl}}"> </dataControls:RadListView> </StackLayout></StackLayout>001.using System;002.using System.Collections;003.using System.Diagnostics;004.using System.Windows.Input;005.using MyMd.Mobile.Core.Mvvm.Extensions;006.using MyMd.Mobile.Core.Utilities;007.using Xamarin.Forms;008. 009.namespace MyMd.Mobile.Core.Controls010.{011. public partial class MdListView012. {013. private const double SwipeThreshold = 30;014. 015. public static readonly BindableProperty ItemsProperty = BindableProperty.Create(nameof(Items), typeof(IEnumerable), typeof(MdListView),016. propertyChanged: ItemsChanged);017. 018. public static readonly BindableProperty IsLoadingProperty = BindableProperty.Create(nameof(IsLoading), typeof(bool), typeof(MdListView), false);019. 020. public static readonly BindableProperty ItemTappedCommandProperty = BindableProperty.Create(nameof(ItemTappedCommand), typeof(ICommand), typeof(MdListView),021. propertyChanged: ItemTappedCommandChanged);022. 023. public static readonly BindableProperty DeleteCommandProperty = BindableProperty.Create(nameof(DeleteCommand), typeof(ICommand), typeof(MdListView),024. propertyChanged: DeleteCommandChanged);025. 026. public static readonly BindableProperty ListItemTemplateSelectorProperty = BindableProperty.Create(nameof(ListItemTemplateSelector),027. typeof(DataTemplateSelector), typeof(MdListView));028. 029. public IEnumerable Items030. {031. get => (IEnumerable) GetValue(ItemsProperty);032. set => SetValue(ItemsProperty, value);033. }034. 035. public bool IsLoading036. {037. get => (bool) GetValue(IsLoadingProperty);038. set => SetValue(IsLoadingProperty, value);039. }040. 041. public ICommand ItemTappedCommand042. {043. get => (ICommand) GetValue(ItemTappedCommandProperty);044. set => SetValue(ItemTappedCommandProperty, value);045. }046. 047. public ICommand DeleteCommand048. {049. get => (ICommand) GetValue(ItemTappedCommandProperty);050. set => SetValue(ItemTappedCommandProperty, value);051. }052. 053. public DataTemplateSelector ListItemTemplateSelector054. {055. get => (DataTemplateSelector) GetValue(ListItemTemplateSelectorProperty);056. set => SetValue(ListItemTemplateSelectorProperty, value);057. }058. 059. public string ListDescription { get; set; }060. public string EmptyListText { get; set; } = Properties.Resources.EmptyList;061. public Style ListStyle { get; set; }062. public DataTemplate ListItemTemplate { get; set; }063. public View Footer { get; set; }064. 065. private bool _isEmpty;066. public bool IsEmpty067. {068. get => _isEmpty;069. set070. {071. _isEmpty = value;072. OnPropertyChanged(nameof(IsEmpty));073. }074. }075. 076. public MdListView()077. {078. InitializeComponent();079. }080. 081. private static void ItemsChanged(BindableObject bindable, object oldItems, object newItems)082. {083. if (newItems == oldItems || !(newItems is IEnumerable items))084. return;085. 086. var listView = (MdListView) bindable;087. 088. listView.IsEmpty = items.IsEmpty();089. }090. 091. private static void ItemTappedCommandChanged(BindableObject bindable, object oldCommand, object newCommand)092. {093. if (!(newCommand is ICommand command))094. return;095. 096. var listView = (MdListView) bindable;097. 098. listView.InternalList.ItemTapped += (sender, args) => command.Execute(args.Item);099. }100. 101. private static void DeleteCommandChanged(BindableObject bindable, object oldCommand, object newCommand)102. {103. if (!(newCommand is ICommand command))104. return;105. 106. var listView = (MdListView) bindable;107. 108. listView.InternalList.IsItemSwipeEnabled = true;109. listView.InternalList.SwipeThreshold = SwipeThreshold;110. listView.InternalList.SwipeOffset = new Thickness(0, 0, SwipeThreshold * 2, 0);111. 112. listView.InternalList.ItemSwipeContentTemplate = new DataTemplate(() =>113. {114. var container = new Grid115. {116. Style = listView.FindResource<Style>("MdListView.SwipeContentContainerStyle")117. };118. 119. container.ColumnDefinitions.Add(new ColumnDefinition { Width = new GridLength(1, GridUnitType.Star) });120. container.ColumnDefinitions.Add(new ColumnDefinition { Width = new GridLength(SwipeThreshold * 2, GridUnitType.Absolute)});121. container.RowDefinitions.Add(new RowDefinition { Height = new GridLength(1, GridUnitType.Star)});122. 123. var deleteButton = new TappableImage124. {125. Style = listView.FindResource<Style>("MdListView.DeleteButtonStyle"),126. Source = listView.FindImageSourceResouce("Image.Delete"),127. TappedCommand = command128. };129. 130. container.Children.Add(deleteButton, 1, 0);131. 132. return container;133. });134. }135. }136.}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?
3 Answers, 1 is accepted
0
Marek
Top achievements
Rank 2
Rank 2
answered on 15 Jan 2018, 11:04 AM
Updating to 2017.3.1214.2 fixed the issue
0
Dmitry
Top achievements
Rank 1
Rank 1
answered on 06 Jun 2018, 07:21 AM
Still happens in the latest version
0
Hello Dmitry,
This error usually occurs because of missing Required Android Support libraries or required Telerik assemblies for RadListView.
After confirming you have all the required libraries, double check that you have the installed SDK and build tools of the same SDK version those libraries need (using the Android SDK Manager).
Regards,
Lance | Tech Support Engineer, Sr.
Progress Telerik
This error usually occurs because of missing Required Android Support libraries or required Telerik assemblies for RadListView.
After confirming you have all the required libraries, double check that you have the installed SDK and build tools of the same SDK version those libraries need (using the Android SDK Manager).
Regards,
Lance | Tech Support Engineer, Sr.
Progress Telerik
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