Telerik Forums
UI for Xamarin Forum
or
Ask question
All Questions
Unanswered
Answered
1,770 questions
1 answer
167 views
cannot connect to NuGet

Hi,

I signed up for a trial of UI for Xamarin. I added Telerik NuGet server as described in http://docs.telerik.com/devtools/xamarin/installation-and-deployment/telerik-nuget-server, but I am not able to connect.

In Visual Studio I get a popup asking me to login, but my Telerik credentials do not work.

Thanks.

General Discussions
Mikhail
Top achievements
Rank 1
 answered on 04 Jul 2017
7 answers
148 views
iOS not displaying Selected Items fine on Android (2017.1.10321.233)

In my application I may have multiple select list on a single screen.  I do not know how many before the user launches the application.  My view is showing all of my data just fine.  However on the iOS only, it is not displaying the selecteditems in my "inside " list view.  When I leave the page and save results the data is correctly saving.  Additional note  If a listview item, isselected = true then on tapping it twice to set it back to false the selection changed does fire.

<?xml version="1.0" encoding="utf-8" ?>
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             xmlns:telerikDataControls="clr-namespace:Telerik.XamarinForms.DataControls;assembly=Telerik.XamarinForms.DataControls"
             xmlns:telerikListView="clr-namespace:Telerik.XamarinForms.DataControls.ListView;assembly=Telerik.XamarinForms.DataControls"
             x:Class="LeadPod_FORMS.View.ActiveSurveyView"
             Style="{StaticResource backgroundStyle}">
  
    <Grid Margin="5,0,5,0">
        <Grid.RowDefinitions>
            <RowDefinition Height="100" />
            <RowDefinition Height="*" />
            <!--<RowDefinition Height="*" />-->
        </Grid.RowDefinitions>
        <Grid Grid.Row="0" Style="{StaticResource headerStyle}">
            <Grid.RowDefinitions>
                <RowDefinition Height="Auto" />
                <RowDefinition Height="Auto" />
            </Grid.RowDefinitions>
            <Grid.ColumnDefinitions>
                <ColumnDefinition Width="*"/>
                <ColumnDefinition Width="*"/>
                <ColumnDefinition Width="*"/>
            </Grid.ColumnDefinitions>
            <Button Grid.Row="0" Grid.Column="0" x:Name="LogOutBtn" Image="backArrow.png" Style="{StaticResource headerBackStyle}" HorizontalOptions="Start" Clicked="SaveBtnClick" />
            <Image Grid.Row="0" Grid.Column="1" Source="headerlogo.png" HorizontalOptions="Center" />
            <BoxView Grid.Row="1" Grid.Column="0" Grid.ColumnSpan="3" BackgroundColor="#37225a" />
            <Label Grid.Row="1" Grid.Column="0" Grid.ColumnSpan="2" Text="{Binding surveyTitle}" Margin="20,0,0,0" VerticalOptions="Center" HorizontalOptions="Start" FontAttributes="Bold" Style="{StaticResource emailHeaderLabelStyle}" />
            <Label Grid.Row="1" Grid.Column="1" Grid.ColumnSpan="2" Text="{Binding emailAddress}" Margin="0,0,20,0" VerticalOptions="Center" HorizontalOptions="End" Style="{StaticResource emailHeaderLabelStyle}" />
        </Grid>
    <telerikDataControls:RadListView x:Name="surveyListView" SelectionMode="None" Style="{StaticResource listViewStyle}" ItemsSource="{Binding Qualifiers}" Grid.Row="1">
      <telerikDataControls:RadListView.ItemStyle>
        <telerikListView:ListViewItemStyle  BorderColor="Transparent" BorderWidth="5" BorderLocation="Bottom"/>
      </telerikDataControls:RadListView.ItemStyle>
      <telerikDataControls:RadListView.ItemTemplate>
        <DataTemplate>
          <telerikListView:ListViewTemplateCell>
            <telerikListView:ListViewTemplateCell.View>
              <StackLayout>
                                <StackLayout Orientation="Horizontal" Style="{StaticResource menuBarStyle}" Margin="0" IsEnabled="{Binding isContact}" IsVisible="{Binding isContact}">
                                    <StackLayout Spacing="0">
                                        <Label x:Name="ScanFullName" Text="{Binding ScanFullName}" Style="{StaticResource contactNameLabelStyle}" />
                                        <Label x:Name="ScanTitleLbl" Text="{Binding ScanTitle}" Style="{StaticResource contactCompanyLabelStyle}" />
                                        <Label x:Name="ScanCompanyName" Text="{Binding ScanCompanyName}" Style="{StaticResource contactCompanyLabelStyle}" />
                                        <Label x:Name="MissingInfoParts" Text="{Binding MissingInfoParts}" HorizontalTextAlignment="Start" Style="{StaticResource errorLabelStyle}" IsEnabled="{Binding isMissingContactInfo}" IsVisible="{Binding isMissingContactInfo}" />
                                    </StackLayout>
                                    <Button Text="Edit" Clicked="EditDetailsBtnClick" HorizontalOptions="EndAndExpand" Style="{StaticResource buttonBarStyle}" />
                                </StackLayout>
                                <StackLayout Orientation="Horizontal" Style="{StaticResource menuBarStyle}" IsEnabled="{Binding isFooter}" IsVisible="{Binding isFooter}">
                                    <StackLayout.Margin>
                                        <OnPlatform x:TypeArguments="Thickness"
                                            iOS="0, 125, 0, 125"
                                            Android="0, 0,0, 0"
                                            WinPhone="0, 0, 0, 0" />
                                    </StackLayout.Margin>
                                    <Label Text=" " Style="{StaticResource contactNameLabelStyle}" />
                                </StackLayout>
                                <!--Single Select-->
                <StackLayout IsEnabled="{Binding QualifierisSingle}" IsVisible="{Binding QualifierisSingle}" Style="{StaticResource licenseListItemStyle}">
                  <Label Text="{Binding QualifierTitle}" Style="{StaticResource surveyTitleLabelStyle}" />
                  <telerikDataControls:RadListView SelectedItems="{Binding SelectedQualifierChoices}" BindingContextChanged="testUnfocused" ItemsSource="{Binding QualifierChoices}"  SelectionChanged="singleChanged" SelectionMode="Single">
                    <telerikDataControls:RadListView.ItemStyle>
                      <telerikListView:ListViewItemStyle BackgroundColor="Transparent" BorderLocation="None"/>
                    </telerikDataControls:RadListView.ItemStyle>
                    <telerikDataControls:RadListView.ItemTemplate>
                      
                      <DataTemplate>
                        <telerikListView:ListViewTemplateCell>
                          <telerikListView:ListViewTemplateCell.View>
                          <StackLayout>
                            <Label Text="{Binding QualifierChoiceTitle}" Style="{StaticResource surveyChoiceLabelStyle}" />
                          </StackLayout>
                          </telerikListView:ListViewTemplateCell.View>
                        </telerikListView:ListViewTemplateCell>
                      </DataTemplate>
                    </telerikDataControls:RadListView.ItemTemplate>
                  </telerikDataControls:RadListView>
                </StackLayout>
                <!--Multi Select-->
                <StackLayout IsEnabled="{Binding QualifierisMulti}" IsVisible="{Binding QualifierisMulti}" Style="{StaticResource licenseListItemStyle}">
                  <Label Text="{Binding QualifierTitle}" Style="{StaticResource surveyTitleLabelStyle}" />
                  <telerikDataControls:RadListView SelectedItems="{Binding SelectedQualifierChoices}" BindingContextChanged="testUnfocused" ItemsSource="{Binding QualifierChoices}"  SelectionChanged="singleChanged" SelectionMode="Multiple">
                    <telerikDataControls:RadListView.ItemStyle>
                      <telerikListView:ListViewItemStyle BackgroundColor="Transparent" BorderLocation="None"/>
                    </telerikDataControls:RadListView.ItemStyle>
                    <telerikDataControls:RadListView.SelectedItemStyle>
                      <telerikListView:ListViewItemStyle BackgroundColor="#bdafcf" BorderWidth="2" BorderLocation="All"/>
                    </telerikDataControls:RadListView.SelectedItemStyle>
                    <telerikDataControls:RadListView.ItemTemplate>
                      <DataTemplate>
                        <telerikListView:ListViewTemplateCell>
                          <telerikListView:ListViewTemplateCell.View>
                            <StackLayout>
                              <Label Text="{Binding QualifierChoiceTitle}" Style="{StaticResource surveyChoiceLabelStyle}" /> 
                            </StackLayout>
                          </telerikListView:ListViewTemplateCell.View>
                        </telerikListView:ListViewTemplateCell>
                      </DataTemplate>
                    </telerikDataControls:RadListView.ItemTemplate>
                  </telerikDataControls:RadListView>
                </StackLayout>
                <!--Numeric-->
                <StackLayout IsEnabled="{Binding QualifierisNumber}" IsVisible="{Binding QualifierisNumber}" Style="{StaticResource licenseListItemStyle}">
                  <StackLayout Orientation="Horizontal">
                  <Label Text="{Binding QualifierTitle}" Style="{StaticResource surveyTitleLabelStyle}" />
                    <Label BindingContext="{x:Reference slider}" Style="{StaticResource surveyNumericLabelStyle}" Text="{Binding Value, StringFormat='{0:F0}'}" />
                    </StackLayout>
                  <Slider x:Name="slider" VerticalOptions="CenterAndExpand" HeightRequest="45" Maximum="{Binding QualifierMaxValue}" Minimum="{Binding QualifierMinValue}" Value="{Binding QualifierIntValue}" ValueChanged="sliderValChanged" />
                  
                  
                    
                  
                </StackLayout>
                <!--Text Area-->
                                <StackLayout IsEnabled="{Binding QualifierisNote}" IsVisible="{Binding QualifierisNote}" Style="{StaticResource licenseListItemStyle}">
                                    <Label Text="{Binding QualifierTitle}" Style="{StaticResource surveyTitleLabelStyle}" />
                                    <ContentView Style="{StaticResource BorderStyle}" >
                                        <ContentView Style="{StaticResource InternalViewStyle}">
                                            <Editor HeightRequest="100" IsEnabled="{Binding QualifierisNote}" IsVisible="{Binding QualifierisNote}" Text="{Binding QualifierStringValue}" Style="{StaticResource surveyEditorStyle}" />
                                        </ContentView>
                                    </ContentView>
                                </StackLayout>
                            </StackLayout>
            </telerikListView:ListViewTemplateCell.View>
          </telerikListView:ListViewTemplateCell>
        </DataTemplate>
      </telerikDataControls:RadListView.ItemTemplate>
<telerikDataControls:RadListView.LayoutDefinition>
          <telerikListView:ListViewLinearLayout VerticalItemSpacing="1" />
        </telerikDataControls:RadListView.LayoutDefinition>
            
    </telerikDataControls:RadListView>
  </Grid>
    
</ContentPage>

Some code behind workings:

void singleChanged(object sender, System.Collections.Specialized.NotifyCollectionChangedEventArgs args)
        {
 
            if (((Telerik.XamarinForms.DataControls.RadListView)sender).ItemsSource != null)
            {
                if (args.OldItems != null)
                {
                    //item is beind set to false
                    LeadPod_FORMS.ViewModel.ActiveQualifierChoiceViewModel changedItem = (LeadPod_FORMS.ViewModel.ActiveQualifierChoiceViewModel)args.OldItems[0];
 
 
                    foreach (LeadPod_FORMS.ViewModel.ActiveQualifierChoiceViewModel i in ((Telerik.XamarinForms.DataControls.RadListView)sender).ItemsSource)
                    {
                        if (changedItem.QUalifierChoiceID == i.QUalifierChoiceID)
                        {
                            ((Telerik.XamarinForms.DataControls.RadListView)sender).SelectedItems.Remove(changedItem);
                        }
 
                    }
 
                }
 
                else
                {
                    LeadPod_FORMS.ViewModel.ActiveQualifierChoiceViewModel changedItem = (LeadPod_FORMS.ViewModel.ActiveQualifierChoiceViewModel)((Telerik.XamarinForms.DataControls.RadListView)sender).SelectedItem;
 
                    if (changedItem != null)
                    {
                        foreach (LeadPod_FORMS.ViewModel.ActiveQualifierChoiceViewModel i in ((Telerik.XamarinForms.DataControls.RadListView)sender).ItemsSource)
                        {
                            if (changedItem.QUalifierChoiceID == i.QUalifierChoiceID)
                            {
                                ((Telerik.XamarinForms.DataControls.RadListView)sender).SelectedItems.Add(changedItem);
                            }
 
                        }
                    }
                    //item is being set to true
                }
 
            }
}

void testUnfocused(object sender, EventArgs args)
        {
            if (((Telerik.XamarinForms.DataControls.RadListView)sender).ItemsSource != null)
            {
                foreach (LeadPod_FORMS.ViewModel.ActiveQualifierChoiceViewModel i in ((Telerik.XamarinForms.DataControls.RadListView)sender).ItemsSource)
                {
                    if(i.QualifierChoiceIsSelected)
                    {
                        ((Telerik.XamarinForms.DataControls.RadListView)sender).SelectedItems.Add(i);
                    }
                }
            }
         }

 

Again the Android version works perfectly, but the iOS version is not displaying the SelectedItems when the screen loads.  Any help would greatly be appreciated.  I am guessing the main problem is having a listview inside a listview, but I don't understand why that is preventing the UI from showing what is selected.  I have checked on load, and the Listview does infact have the proper items inside the selecteditems collection, it is just not showing them.

 

Thanks in advance for any help

 

 

ListView
Stefan Nenchev
Telerik team
 answered on 04 Jul 2017
3 answers
97 views
How to style TKCalendarMonthTitleCell

I would like to style or remove the title bar over the calendar, where the month name appears.

It is a TKCalendarMonthTitleCell.

I can't find any property to style it

Any directions ?

 

Calendar & Scheduling
Nikolay Demirev
Telerik team
 answered on 30 Jun 2017
1 answer
122 views
TimeEditor
Is there anyway to disable certain hour and minutes from the editor when it is shown to user? Eg., I would like to make only 00, 15, 30 and 45 minutes available for selection. Can this be done at design time statically and runtime dynamically?
DataForm
Stefan Nenchev
Telerik team
 answered on 26 Jun 2017
1 answer
139 views
Changing individual data-form fields read-only state at run-time?

Hi there,

 

I'm using the Dataform and I'm wondering is there a way for me to change the read only property of certain data-form property at run-time.

The idea being that depending on the user you would only want them to be able to edit certain elements go the data form.

Is it possible to access the read-only attribute from the code behind?

 

Thanks for your Assistance.

DataForm
Stefan Nenchev
Telerik team
 answered on 22 Jun 2017
1 answer
228 views
NullReferenceException Updating ObservableCollection for Series

I just upgraded Telerik UI from v2016.2.708.1 to v2017.2.614.2, and I'm now getting an exception thrown when I try to add a data point to a series. The series is bound to an ObservableCollection, and I can work around the problem by replacing the entire collection when new data is added, but that obviously defeats the purpose of using ObservableCollection.

Has anybody run into this issue? Stack trace follows. Thanks.

====================================================================================

06-20 12:18:53.481 I/MonoDroid( 2065): UNHANDLED EXCEPTION:
06-20 12:18:53.482 I/MonoDroid( 2065): System.NullReferenceException: Object reference not set to an instance of an object.
06-20 12:18:53.482 I/MonoDroid( 2065):   at Telerik.XamarinForms.ChartRenderer.Android.BaseChartRenderer`2[TChart,TNativeChart].Telerik.XamarinForms.Chart.IChartRenderer.OnSeriesSourceCollectionChanged (System.Object sender, System.Collections.Specialized.NotifyCollectionChangedEventArgs e, System.Object series) [0x0000c] in <18a6b9b1742b4acca8ea1bef8ca6f563>:0 
06-20 12:18:53.482 I/MonoDroid( 2065):   at Telerik.XamarinForms.Chart.RadCartesianChart.SeriesSource_CollectionChanged (System.Object sender, System.Collections.Specialized.NotifyCollectionChangedEventArgs e) [0x00009] in <18a6b9b1742b4acca8ea1bef8ca6f563>:0 
06-20 12:18:53.482 I/MonoDroid( 2065):   at (wrapper delegate-invoke) <Module>:invoke_void_object_NotifyCollectionChangedEventArgs (object,System.Collections.Specialized.NotifyCollectionChangedEventArgs)
06-20 12:18:53.482 I/MonoDroid( 2065):   at System.Collections.ObjectModel.ObservableCollection`1[T].OnCollectionChanged (System.Collections.Specialized.NotifyCollectionChangedEventArgs e) [0x0000f] in <a547bd0d78184f26ab08d022f013c1e1>:0 
06-20 12:18:53.482 I/MonoDroid( 2065):   at System.Collections.ObjectModel.ObservableCollection`1[T].OnCollectionChanged (System.Collections.Specialized.NotifyCollectionChangedAction action, System.Object item, System.Int32 index) [0x00009] in <a547bd0d78184f26ab08d022f013c1e1>:0 
06-20 12:18:53.482 I/MonoDroid( 2065):   at System.Collections.ObjectModel.ObservableCollection`1[T].InsertItem (System.Int32 index, T item) [0x00024] in <a547bd0d78184f26ab08d022f013c1e1>:0 
06-20 12:18:53.482 I/MonoDroid( 2065):   at System.Collections.ObjectModel.Collection`1[T].Add (T item) [0x00020] in <3fd174ff54b146228c505f23cf75ce71>:0 

Chart
Stefan Nenchev
Telerik team
 answered on 21 Jun 2017
1 answer
237 views
ListView text cell binding

Hi, 

I am using the text cell and I am wondering if I can bind multiple properties in my class to one cell.

 

For example, this is what I currently have;

 

<DataTemplate>

    <telerikListView:ListViewTextCell Text="{Binding client, StringFormat='Client: {0}'}" Detail="{Binding trans_date}" TextColor="Black" DetailColor="LightGray"/>
</DataTemplate>

 

And what I want to do is add another part to the stringformat. EG this: "StringFormat='Client{0} ~ ID: {1}"     - Is this possible, and if it is, can someone give me an example. 

Any assistance is appreciated. Thanks.

ListView
Lance | Senior Manager Technical Support
Telerik team
 answered on 19 Jun 2017
1 answer
130 views
Text is not centered.
<telerikGauges:RadRadialGauge.Indicators>
 
   <telerikGauges:GaugeNeedleIndicator Offset="30" Value="{Binding Kpi.Production.Tone}" />
 
   <telerikGauges:GaugeTextIndicator HorizontalTextPlacement="Center" VerticalTextPlacement="Top" FontSize="20" FontAttributes="Bold" FontFamily="Calibri" TextColor="Navy" Text="{Binding Kpi.OEEPercent, StringFormat='OEE: %{0:N0}'}"/>
 
</telerikGauges:RadRadialGauge.Indicators>

 

Is there a solution?

Thanks.

Gauges
Stefan Nenchev
Telerik team
 answered on 19 Jun 2017
1 answer
147 views
How to change the background color of PlotArea in RadCartesianChart

Hi,

How can I change the background color of PlotArea in RadCartesianChart (Xamarin.Forms)?

Chart
Stefan Nenchev
Telerik team
 answered on 19 Jun 2017
4 answers
102 views
Crash when Russian culture is set

Hi,

 

Bar char with tooltips. It works fine with English but crashes with Russian and probably other cultures using comma as decimals separator.

Culture is set like this:

var cultureInfo = new CultureInfo("ru");

CultureInfo.DefaultThreadCurrentUICulture = cultureInfo;
CultureInfo.DefaultThreadCurrentCulture = cultureInfo;

 

Here is the exception details:

AndroidPropertyNameDataPointBinding.java

java.lang.NumberFormatException: Invalid long: "8145,17"

 

java.lang.Long.invalidLong Long.java:124
java.lang.Long.parse Long.java:363
java.lang.Long.parseLong Long.java:353
java.lang.Long.parseLong Long.java:321
java.math.BigDecimal.<init> BigDecimal.java:344
java.math.BigDecimal.<init> BigDecimal.java:425
md55d97e70f294cadecf8b72d95928fece7.AndroidPropertyNameDataPointBinding.n_getValue AndroidPropertyNameDataPointBinding.java
md55d97e70f294cadecf8b72d95928fece7.AndroidPropertyNameDataPointBinding.getValue AndroidPropertyNameDataPointBinding.java:30
com.telerik.widget.chart.engine.databinding.datasources.CategoricalSeriesDataSource.initializeBinding CategoricalSeriesDataSource.java:60
com.telerik.widget.chart.engine.databinding.datasources.ChartSeriesDataSource.generateDataPoint ChartSeriesDataSource.java:214
com.telerik.widget.chart.engine.databinding.datasources.ChartSeriesDataSource.bindCore ChartSeriesDataSource.java:184
com.telerik.widget.chart.engine.databinding.datasources.ChartSeriesDataSource.bind ChartSeriesDataSource.java:280
com.telerik.widget.chart.engine.databinding.datasources.ChartSeriesDataSource.rebind ChartSeriesDataSource.java:125
com.telerik.widget.chart.engine.databinding.datasources.ChartSeriesDataSource.setItemsSource ChartSeriesDataSource.java:92
com.telerik.widget.chart.visualization.common.ChartSeries.initDataBinding ChartSeries.java:628
com.telerik.widget.chart.visualization.cartesianChart.series.categorical.CategoricalSeriesBase.initDataBinding CategoricalSeriesBase.java:89
com.telerik.widget.chart.visualization.cartesianChart.series.categorical.CategoricalSeries.initDataBinding CategoricalSeries.java:66
com.telerik.widget.chart.visualization.common.ChartSeries.setData ChartSeries.java:415
com.telerik.widget.chart.visualization.cartesianChart.series.categorical.BarSeries.setData BarSeries.java:527
mono.java.lang.RunnableImplementor.n_run RunnableImplementor.java
mono.java.lang.RunnableImplementor.run RunnableImplementor.java:30
android.os.Handler.handleCallback Handler.java:739
android.os.Handler.dispatchMessage Handler.java:95
android.os.Looper.loop Looper.java:148
android.app.ActivityThread.main ActivityThread.java:5417
java.lang.reflect.Method.invoke Method.java
com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run ZygoteInit.java:726
com.android.internal.os.ZygoteInit.main ZygoteInit.java:616

 

Thanks

Vitaly

Chart
Nikolay
Telerik team
 answered on 19 Jun 2017
Narrow your results
Done
Selected tags
Tags
ListView
General Discussions
Chart
Calendar & Scheduling
DataGrid
DataForm
SideDrawer
AutoComplete
Calendar - Xamarin.iOS
TreeView
Chart - Xamarin.Android
SlideView
AutoCompleteView
TabView
Gauges
Chart - Xamarin.iOS
Chat (Conversational UI)
Entry
Calendar - Xamarin.Android
SegmentedControl
PdfViewer
BusyIndicator
ListView - Xamarin.Android
Popup
ListView - Xamarin.iOS
Button
ListPicker
Styling
NumericInput
RichTextEditor
DataForm - Xamarin.iOS
ComboBox
CheckBox
DataForm - Xamarin.Android
Expander
MaskedInput
DateTimePicker
Installer and Visual Studio Extensions
SideDrawer - Xamarin.iOS
Barcode
Border
Accessibility
AutoCompleteTextView - Xamarin.iOS
Gauges - Xamarin.iOS
ImageEditor
TimePicker
Accordion
DatePicker
AutoCompleteTextView - Xamarin.Android
Map
ZipLibrary
AppFeedback - Xamarin.iOS
Localization
Rating
SpreadStreamProcessing
DockLayout
Gauges - Xamarin.Android
Path
TimeSpanPicker
BadgeView
Alert - Xamarin.iOS
AppFeedback - Xamarin.Android
Licensing
NumberPicker - Xamarin.Android
Security
SideDrawer - Xamarin.Android
TemplatedPicker
Shadow
SignaturePad
ProgressBar
+? more
Top users last month
Rob
Top achievements
Rank 3
Bronze
Bronze
Iron
Sergii
Top achievements
Rank 1
Iron
Iron
Dedalus
Top achievements
Rank 1
Iron
Iron
Lan
Top achievements
Rank 1
Iron
Doug
Top achievements
Rank 1
Want to show your ninja superpower to fellow developers?
Learn how
126 127
128
129 130
Top users last month
Rob
Top achievements
Rank 3
Bronze
Bronze
Iron
Sergii
Top achievements
Rank 1
Iron
Iron
Dedalus
Top achievements
Rank 1
Iron
Iron
Lan
Top achievements
Rank 1
Iron
Doug
Top achievements
Rank 1
Want to show your ninja superpower to fellow developers?
Learn how
Want to show your ninja superpower to fellow developers?
Learn how