Questions on UI for Xamarin Forum

3 answers

123 views

Major and Minor step lines for scatter line chart

Hello,

I am currently implementing the ScatterLineSeries for a RadCartesianChartView.

What I am unable to get working is the Major and Minor Step lines for the graph.

Any input would be helpful, thank you.

private void createChart()

{

scatterPointSeries.StrokeColor = Color.Green;

scatterPointSeries.XValueBinding = new XValueBinding();

scatterPointSeries.YValueBinding = new YValueBinding();

LinearAxis verticalAxis = new LinearAxis();

verticalAxis.LabelValueToStringConverter = new YLabelValueConverter();

verticalAxis.Maximum = 4;

verticalAxis.Minimum = 0;

LinearAxis horizontalAxis = new LinearAxis();

horizontalAxis.LabelValueToStringConverter = new XLabelValueConverter();

horizontalAxis.Maximum = 24;

horizontalAxis.Minimum = 0;

horizontalAxis.MajorStep = 1;

scatterPointSeries.VerticalAxis = verticalAxis;

scatterPointSeries.HorizontalAxis = horizontalAxis;

//Bind series to data

scatterPointSeries.Data = this.getData();

//Add series to chart

chart.Series.Add(scatterPointSeries);

CartesianChartGrid grid = new CartesianChartGrid();

grid.MajorYLinesRenderMode = GridLineRenderMode.All;

grid.LineThickness = 1;

grid.LineColor = Color.Black;

grid.MajorLinesVisibility = GridLineVisibility.Y;

chart.Grid = grid;

}

Chart - Xamarin.Android

answered on 17 Jul 2017

1 answer

96 views

RadCartesianChartView Minor step

Hello,

We have used the Kendo version of the chart view to create a scatter line graph with both minor and major lines.

What I am noticing is that there seems to be no support for minor steps for the Xamarin android chart.

If anybody could please advise how to add minor steps or a usable workaround.

Chart - Xamarin.Android

answered on 14 Jul 2017

1 answer

122 views

Position of data points on Xamarin Forms UWP Pie Chart

Hello,

Is there any way to change position of data points (numbers) on Xamarin Forms UWP/Windows Pie Chart, currently they render out side of Pie Chart, and get clipped.

Thanks,

Ram prasad

Chart

answered on 14 Jul 2017

2 answers

162 views

Sample app

This really needs to be improved.

The sample for BarSeries and others is just code behind...seriously who uses the controls like that???

The samples are slapped together with little love, they are supposed to showcase the product!

General Discussions

answered on 13 Jul 2017

3 answers

137 views

BarSeries Colors

Hi, is it possible to have different colors for each bar in a single series. If possible, can i get an example of how i can do that. The docs kinda show how to do that for two different series from the way i understand.

Thanks

Chart - Xamarin.Android

answered on 13 Jul 2017

1 answer

108 views

Multiple selection

is possible to select multiple items in the same RadSegmentedControl ?

SegmentedControl

answered on 10 Jul 2017

1 answer

110 views

Datetime axis in Microsecond

I am trying to implement the chart with DateTime axis in microsecond interval. Also, while trying to add the date with day intervals, all data are overlapped.Could you please resolve this?

Chart

answered on 06 Jul 2017

11 answers

323 views

RadListView causes crash when PropertyGroupDescriptor has nulls

Looks like a bug to me in version 2017.1.1220.233...

The Issue

Here is my model, I have a collection of these;

public class Site

{

public int SiteId { get; set; }

public string SiteName { get; set; }

public string SiteDetailText { get; set; }

public string FarmName { get; set; }

}

Here is the XAML definition of the RadListView;

<telerikui:RadListView x:Name="SitesList" ItemsSource="{Binding MySites}">

<telerikui:RadListView.ItemTemplate>

<DataTemplate>

<listView:ListViewTemplateCell>

<listView:ListViewTemplateCell.View>

<Grid Padding="5">

<Grid.RowDefinitions>

<RowDefinition Height="Auto" />

</Grid.RowDefinitions>

<Label Grid.Row="0" Text="{Binding SiteName}" FontSize="Large" />

<Label Grid.Row="1" Text="{Binding SiteDetailText}" />

</Grid>

</listView:ListViewTemplateCell.View>

</listView:ListViewTemplateCell>

</DataTemplate>

</telerikui:RadListView.ItemTemplate>

<telerikui:RadListView.GroupDescriptors>

<listView:PropertyGroupDescriptor PropertyName="FarmName" />

</telerikui:RadListView.GroupDescriptors>

</telerikui:RadListView>

I get the collection of Site models from a JSON string, and sometimes the FarmName property is missing, meaning FarmName is null. When I run the application this exception is thrown;

03-23 12:08:52.176 I/MonoDroid( 4852): UNHANDLED EXCEPTION:
03-23 12:08:52.180 I/MonoDroid( 4852): System.ArgumentException: The default comparer works with elements that implement IComparable interface.
03-23 12:08:52.180 I/MonoDroid( 4852): at (wrapper managed-to-native) Java.Interop.NativeMethods:java_interop_jnienv_call_nonvirtual_void_method_a (intptr,intptr&,intptr,intptr,intptr,Java.Interop.JniArgumentValue*)
03-23 12:08:52.180 I/MonoDroid( 4852): at Java.Interop.JniEnvironment+InstanceMethods.CallNonvirtualVoidMethod (Java.Interop.JniObjectReference instance, Java.Interop.JniObjectReference type, Java.Interop.JniMethodInfo method, Java.Interop.JniArgumentValue* args) [0x0008f] in /Users/builder/data/lanes/4009/9578cdcd/source/Java.Interop/src/Java.Interop/Java.Interop/JniEnvironment.g.cs:12079
03-23 12:08:52.180 I/MonoDroid( 4852): at Android.Runtime.JNIEnv.CallNonvirtualVoidMethod (System.IntPtr jobject, System.IntPtr jclass, System.IntPtr jmethod, Android.Runtime.JValue* parms) [0x00000] in /Users/builder/data/lanes/4009/9578cdcd/source/monodroid/src/Mono.Android/JNIEnv.g.cs:444
03-23 12:08:52.180 I/MonoDroid( 4852): at Com.Telerik.Widget.List.ListViewAdapter.set_Items (System.Collections.IList value) [0x0009d] in <4ab376ccf3e94543ba940e1beffd5307>:0
03-23 12:08:52.180 I/MonoDroid( 4852): at Telerik.XamarinForms.DataControlsRenderer.Android.ListViewDataSourceAdapterExtensions.SetSource (Com.Telerik.Widget.List.ListViewDataSourceAdapter adapter, System.Collections.IEnumerable source) [0x00007] in <0283f7990ca1485d8a9efc5b1581ce6f>:0
03-23 12:08:52.180 I/MonoDroid( 4852): at Telerik.XamarinForms.DataControlsRenderer.Android.ListViewAdapter.UpdateItemsSource (Telerik.XamarinForms.DataControls.RadListView sourceOwner, Com.Telerik.Widget.List.RadListView targetOwner) [0x00011] in <0283f7990ca1485d8a9efc5b1581ce6f>:0
03-23 12:08:52.180 I/MonoDroid( 4852): at Telerik.XamarinForms.DataControlsRenderer.Android.ListViewAdapter.UpdateCore (Telerik.XamarinForms.DataControls.RadListView sourceOwner, Com.Telerik.Widget.List.RadListView targetOwner, System.String propertyName) [0x0004b] in <0283f7990ca1485d8a9efc5b1581ce6f>:0
03-23 12:08:52.180 I/MonoDroid( 4852): at Telerik.XamarinForms.Common.FacadeAdapterBase`2[S,T].Update (System.Object sourceOwner, System.Object targetOwner, System.String propertyName, System.Object sourceOwnerRoot, System.Object targetOwnerRoot) [0x00000] in <41a54de86ddf4ac5b8f46f7114ddd5ec>:0
03-23 12:08:52.180 I/MonoDroid( 4852): at Telerik.XamarinForms.Common.XamarinToNativeControlExtensions.Update[T,K] (T nativeElement, K xfЕlement, System.String propertyName, System.Object sourceOwnerRoot, System.Object targetOwnerRoot) [0x0002b] in <41a54de86ddf4ac5b8f46f7114ddd5ec>:0
03-23 12:08:52.180 I/MonoDroid( 4852): at Telerik.XamarinForms.DataControlsRenderer.Android.ListViewRenderer.OnElementPropertyChanged (System.Object sender, System.ComponentModel.PropertyChangedEventArgs e) [0x00023] in <0283f7990ca1485d8a9efc5b1581ce6f>:0
03-23 12:08:52.180 I/MonoDroid( 4852): at (wrapper delegate-invoke) <Module>:invoke_void_object_PropertyChangedEventArgs (object,System.ComponentModel.PropertyChangedEventArgs)
03-23 12:08:52.180 I/MonoDroid( 4852): at Xamarin.Forms.BindableObject.OnPropertyChanged (System.String propertyName) [0x0000a] in C:\BuildAgent3\work\ca3766cfc22354a1\Xamarin.Forms.Core\BindableObject.cs:137
03-23 12:08:52.180 I/MonoDroid( 4852): at Xamarin.Forms.Element.OnPropertyChanged (System.String propertyName) [0x00000] in C:\BuildAgent3\work\ca3766cfc22354a1\Xamarin.Forms.Core\Element.cs:379
03-23 12:08:52.180 I/MonoDroid( 4852): at Xamarin.Forms.BindableObject.SetValueActual (Xamarin.Forms.BindableProperty property, Xamarin.Forms.BindableObject+BindablePropertyContext context, System.Object value, System.Boolean currentlyApplying, Xamarin.Forms.BindableObject+SetValueFlags attributes, System.Boolean silent) [0x000f4] in C:\BuildAgent3\work\ca3766cfc22354a1\Xamarin.Forms.Core\BindableObject.cs:581
03-23 12:08:52.180 I/MonoDroid( 4852): at Xamarin.Forms.BindableObject.SetValueCore (Xamarin.Forms.BindableProperty property, System.Object value, Xamarin.Forms.BindableObject+SetValueFlags attributes, Xamarin.Forms.BindableObject+SetValuePrivateFlags privateAttributes) [0x0014b] in C:\BuildAgent3\work\ca3766cfc22354a1\Xamarin.Forms.Core\BindableObject.cs:378
03-23 12:08:52.180 I/MonoDroid( 4852): at Xamarin.Forms.BindingExpression.ApplyCore (System.Object sourceObject, Xamarin.Forms.BindableObject target, Xamarin.Forms.BindableProperty property, System.Boolean fromTarget) [0x001f9] in C:\BuildAgent3\work\ca3766cfc22354a1\Xamarin.Forms.Core\BindingExpression.cs:173
03-23 12:08:52.180 I/MonoDroid( 4852): at Xamarin.Forms.BindingExpression.Apply (System.Boolean fromTarget) [0x0003e] in C:\BuildAgent3\work\ca3766cfc22354a1\Xamarin.Forms.Core\BindingExpression.cs:55
03-23 12:08:52.180 I/MonoDroid( 4852): at Xamarin.Forms.BindingExpression+BindingExpressionPart.<PropertyChanged>b__47_0 () [0x00000] in C:\BuildAgent3\work\ca3766cfc22354a1\Xamarin.Forms.Core\BindingExpression.cs:542
03-23 12:08:52.180 I/MonoDroid( 4852): at Java.Lang.Thread+RunnableImplementor.Run () [0x0000b] in /Users/builder/data/lanes/4009/9578cdcd/source/xamarin-android/src/Mono.Android/Java.Lang/Thread.cs:36
03-23 12:08:52.180 I/MonoDroid( 4852): at Java.Lang.IRunnableInvoker.n_Run (System.IntPtr jnienv, System.IntPtr native__this) [0x00009] in /Users/builder/data/lanes/4009/9578cdcd/source/monodroid/src/Mono.Android/platforms/android-25/src/generated/Java.Lang.IRunnable.cs:81
03-23 12:08:52.180 I/MonoDroid( 4852): at (wrapper dynamic-method) System.Object:7de252d4-c417-4d4a-8229-509ea6b9512e (intptr,intptr)

The Fix

If I remove the <RadListView.GroupDescriptors> from the XAML this works fine...

Also, It works without crashing if I change the definition of the FarmName property to have a default value;

public string FarmName { get; set; } = "No Farm"

Can we please have it so the List can handle these null values gracefully (empty string maybe)? Either that or show a clearer error message. I've spent 4 hours trying to get this grouping working, and until I stumbled across the stack trace for the IComparer exception I was struggling to figure out where to start.

Cheers

ListView

answered on 06 Jul 2017

15 answers

285 views

Attribute "showTitle" Has Already Been Defined

Having a compilation error that is only occurring on the Android side.

Error Attribute "showTitle" has already been defined

File in question: \obj\Debug\__library_projects__\Telerik.Xamarin.Android.Input\library_project_imports\res\values\attrs.xml

Unfortunately this could have been caused by numerous different things, it started happening with the recent Xamarin update (4.3.0.795), but I was also forced to update the project target to Android 7.0.

Interestingly enough, if I manually edit the file and remove <attr name="showTitle" format="boolean" /> then the project will build successfully. If I rebuild the project however, the attribute reappears and the build fails.

Below is the content of the Attrs.xml file:

<resources><declare-styleable name="CalendarCellState"><attr name="state_calendar_cell_today" format="boolean" /></declare-styleable><declare-styleable name="RadCalendarView"><attr name="calendarBackground" format="color" /><attr name="showTitle" format="boolean" /><attr name="showDayNames" format="boolean" /><attr name="showGridLines" format="boolean" /><attr name="showCellDecorations" format="boolean" /><attr name="selectionMode" format="enum"><enum name="Single" value="0" /><enum name="Range" value="1" /><enum name="Multiple" value="2" /></attr><attr name="displayMode" format="enum"><enum name="Month" value="0" /><enum name="Year" value="1" /><enum name="Week" value="2" /></attr><attr name="weekNumberDisplayMode" format="enum"><enum name="None" value="0" /><enum name="Inline" value="1" /><enum name="Block" value="2" /></attr><attr name="isYearModeCompact" format="boolean" /></declare-styleable><declare-styleable name="CalendarTheme"><attr name="calendarStyle" format="reference" /></declare-styleable></resources>

General Discussions