Map renderer exception.

Hi TK, Thanks for your great job.

I got following exception when setting up a customMap in my project. ‘’’ 12-10 16:58:52.143 I/MonoDroid(27188): UNHANDLED EXCEPTION: 12-10 16:58:52.163 I/MonoDroid(27188): System.NullReferenceException: Object reference not set to an instance of an object 12-10 16:58:52.164 I/MonoDroid(27188): at TK.CustomMap.Droid.TKCustomMapRenderer.MoveToCenter () [0x0000c] in <filename unknown>:0 12-10 16:58:52.164 I/MonoDroid(27188): at TK.CustomMap.Droid.TKCustomMapRenderer.OnLayout (Boolean changed, Int32 l, Int32 t, Int32 r, Int32 b) [0x00015] in <filename unknown>:0 12-10 16:58:52.165 I/MonoDroid(27188): at Xamarin.Forms.Platform.Android.FormsViewGroup.n_OnLayout_ZIIII (IntPtr jnienv, IntPtr native__this, Boolean p0, Int32 p1, Int32 p2, Int32 p3, Int32 p4) [0x00008] in <filename unknown>:0 12-10 16:58:52.165 I/MonoDroid(27188): at (wrapper dynamic-method) System.Object:b029f907-c661-475e-b1ec-ddf53eca71ac (intptr,intptr,bool,int,int,int,int) 12-10 16:58:52.177 W/art (27188): JNI RegisterNativeMethods: attempt to register 0 native methods for md52ce486a14f4bcd95899665e9d932190b.JavaProxyThrowable An unhandled exception occured.

Thread finished: <Thread Pool> #3 The thread ‘<Thread Pool>’ (0x3) has exited with code 0 (0x0). 12-10 17:00:08.875 I/MonoDroid(27188): UNHANDLED EXCEPTION: Thread started: <Thread Pool> #9 12-10 17:00:08.928 I/MonoDroid(27188): System.NullReferenceException: Object reference not set to an instance of an object 12-10 17:00:08.928 I/MonoDroid(27188): at (wrapper dynamic-method) System.Object:b029f907-c661-475e-b1ec-ddf53eca71ac (intptr,intptr,bool,int,int,int,int) 12-10 17:00:08.929 I/MonoDroid(27188): at (wrapper native-to-managed) System.Object:b029f907-c661-475e-b1ec-ddf53eca71ac (intptr,intptr,int,int,int,int,int) 12-10 17:00:08.929 I/MonoDroid(27188): at (wrapper managed-to-native) System.Object:wrapper_native_0xb47b0db1 (intptr,intptr,intptr,intptr,Android.Runtime.JValue_) 12-10 17:00:08.929 I/MonoDroid(27188): at (wrapper delegate-invoke) <Module>:invoke_void_intptr_intptr_intptr_intptr_JValue_ (intptr,intptr,intptr,intptr,Android.Runtime.JValue_) 12-10 17:00:08.930 I/MonoDroid(27188): at Android.Runtime.JNIEnv.CallNonvirtualVoidMethod (IntPtr jobject, IntPtr jclass, IntPtr jmethod, Android.Runtime.JValue_ parms) [0x00060] in /Users/builder/data/lanes/2512/d3008455/source/monodroid/src/Mono.Android/src/Runtime/JNIEnv.g.cs:1025 12-10 17:00:08.930 I/MonoDroid(27188): at Xamarin.Forms.Platform.Android.FormsViewGroup.MeasureAndLayout (Int32 p0, Int32 p1, Int32 p2, Int32 p3, Int32 p4, Int32 p5) [0x000f8] in <filename unknown>:0 12-10 17:00:08.930 I/MonoDroid(27188): at Xamarin.Forms.Platform.Android.VisualElementTracker.UpdateLayout () [0x000bc] in <filename unknown>:0 12-10 17:00:08.930 I/MonoDroid(27188): at Xamarin.Forms.Platform.Android.VisualElementRenderer1[TElement].UpdateLayout () [0x00008] in <filename unknown>:0 12-10 17:00:08.931 I/MonoDroid(27188): at Xamarin.Forms.Platform.Android.VisualElementRenderer1[TElement].OnLayout (Boolean changed, Int32 l, Int32 t, Int32 r, Int32 b) [0x0003d] in <filename unknown>:0 12-10 17:00:08.931 I/MonoDroid(27188): at Xamarin.Forms.Platform.Android.FormsViewGroup.n_OnLayout_ZIIII (IntPtr jnienv, IntPtr native__this, Boolean p0, Int32 p1, Int32 p2, Int32 p3, Int32 p4) [0x00008] in <filename unknown>:0 12-10 17:00:08.932 I/MonoDroid(27188): at (wrapper dynamic-method) System.Object:b029f907-c661-475e-b1ec-ddf53eca71ac (intptr,intptr,bool,int,int,int,int) 12-10 17:00:08.932 E/art (27188): JNI NewString called with pending exception ‘md52ce486a14f4bcd95899665e9d932190b.JavaProxyThrowable’ thrown in void md55b85883da287a270e8ac6f2218732aaf.TKCustomMapRenderer.n_onLayout(boolean, int, int, int, int):-2 An unhandled exception occured. ‘’’

XAML code:

<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             xmlns:customMap="clr-namespace:TK.CustomMap;assembly=TK.CustomMap"
             xmlns:controls="clr-namespace:Test.Controls;assembly=Test"
             x:Class="Test.Views.MapPage">
  <StackLayout>
    <customMap:TKCustomMap/>
  </StackLayout>
</ContentPage>

I tested this code on your sample project and it works well.

Am i missing something?

[dimeom]

Hi there, thank you very much for your reply! I did as you said.

But now I am getting this error:

System.MissingMethodException: Default constructor not found for type TK.CustomMap.TKCustomMap

my XAML looks like this:

<?xml version="1.0" encoding="utf-8" ?>

<ContentPage xmlns="http://xamarin.com/schemas/2014/forms" xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml" xmlns:local="clr-namespace:test;assembly=test" xmlns:customMap="clr-namespace:TK.CustomMap;assembly=TK.CustomMap" x:Class="test.pageMap"> <ContentPage.Content> <Grid RowSpacing="0" ColumnSpacing="0" BackgroundColor="{DynamicResource bgColor}"> <Grid.ColumnDefinitions> <ColumnDefinition Width="1*"/> <ColumnDefinition Width="1*"/> <ColumnDefinition Width="1*"/> <ColumnDefinition Width="1*"/> </Grid.ColumnDefinitions>

  <Grid.RowDefinitions>
    <RowDefinition Height="1*"/>
    <!--header-->
    <RowDefinition Height="7*"/>

    <RowDefinition Height="1*"/>

  </Grid.RowDefinitions>

  <!--Header-->
  <Grid RowSpacing="0" ColumnSpacing="0" Grid.Row="0" Grid.Column="0" Grid.ColumnSpan="4" BackgroundColor="{DynamicResource bgColor}">
    <Grid.ColumnDefinitions>
      <ColumnDefinition Width="6*"/>
      <ColumnDefinition Width="1*"/>
    </Grid.ColumnDefinitions>
    <Grid.RowDefinitions>
      <RowDefinition Height="1*"/>
    </Grid.RowDefinitions>

    <BoxView Style="{DynamicResource boxViewHeader}" Grid.ColumnSpan="2" />
    <Image x:Name="imgLogoName" Grid.Row="0"  Grid.ColumnSpan="2" VerticalOptions="FillAndExpand" HorizontalOptions="FillAndExpand"></Image>
    <Image x:Name="imgLogo" Grid.Column="1" VerticalOptions="FillAndExpand" HorizontalOptions="FillAndExpand"></Image>
    <Image x:Name="imageBack" Grid.Row="0" Grid.Column="0" VerticalOptions="EndAndExpand" HorizontalOptions="StartAndExpand">
      <Image.GestureRecognizers>
        <TapGestureRecognizer
                Tapped="imageBack_Tapped"
                NumberOfTapsRequired="1" />
      </Image.GestureRecognizers>
    </Image>
  </Grid>
  <!--Header-->

  <Grid Grid.Row="1" Grid.Column="0" Grid.ColumnSpan="4">
    <Grid.ColumnDefinitions>
      <ColumnDefinition Width="1*"/>
    </Grid.ColumnDefinitions>

    <Grid.RowDefinitions>
      <RowDefinition Height="1*"/>

    </Grid.RowDefinitions>
    <!--<local:CustomMap Grid.Row="1" Grid.ColumnSpan="4" VerticalOptions="FillAndExpand" HorizontalOptions="FillAndExpand"-->
    <!--<maps:Map Grid.Row="0" VerticalOptions="FillAndExpand" HorizontalOptions="FillAndExpand"
              x:Name="MyMap"
              IsShowingUser="true"
              MapType="Hybrid" />-->
    <!--<local:CustomMap x:Name="myMap" MapType="Street"
      Grid.Row="0" VerticalOptions="FillAndExpand" HorizontalOptions="FillAndExpand" />-->
    <customMap:TKCustomMap x:Name="MyMap" MapType="Street" Grid.Row="0" VerticalOptions="FillAndExpand" HorizontalOptions="FillAndExpand" />

  </Grid>

  <Label x:Name="lblStart" Text="Schorlejagd starten" Grid.Row="2" Grid.Column="1" Grid.ColumnSpan="3" VerticalOptions="FillAndExpand" HorizontalOptions="Center"></Label>

  <Image x:Name="btnStart" Grid.Row="2" Grid.Column="0" VerticalOptions="FillAndExpand" HorizontalOptions="FillAndExpand">
    <Image.GestureRecognizers>
      <TapGestureRecognizer
              Tapped="btnStart_Tapped"
              NumberOfTapsRequired="1" />
    </Image.GestureRecognizers>
  </Image>
</Grid>

</ContentPage.Content> </ContentPage>

and my Code:

            List<TKCustomMapPin> pins = new List<TKCustomMapPin>();
            foreach (LocationObject location in Globals.Places)
            {
                var position = new Position(double.Parse(location.Latitude.ToString()), double.Parse(location.Longitude.ToString()));
                var pin = new TKCustomMapPin();
                pin.Position = position;
                pin.Title = location.Name;
                pin.Image = Device.OnPlatform("icon.png", "icon.png", "Assets/icon.png");

                pins.Add(pin);
            }

            MyMap.CustomPins = pins;

maybe I am missing something?

[TorbenK]

Hi,

use CustomPins. Please check the samples.