Windows Phone 8 - HowTo display current position on the map

问题

As the title suggest I am struggeling with the display of the current location of the user on the map.

Afaik there a two ways to display the current user location:

In Code: create a ellipse, set it as content of a MapOverlay, set the GeoCoordinate of the MapOverlay, add this overlay to a MapLayer and add this to the map - but I cannot access the MapOverlay anymore and thus I cannot change (update) the position of the user. Is there a way to update the user position without having to redraw all the map layers?
XAML and Code: In Windows Phone 7 I was able to add a Pushpin to the map and let the GeoCoordinateWatcher handle the PositionChanged event and set the MyLocation.Location to the current location.

It seems that there is no way to add a Pushpin to the map if you don't use the Windows Phone Toolkit. So I tried to add Pushpin from the Windows Phone Toolkit:

xmlns:maps="clr-namespace:Microsoft.Phone.Maps.Controls;assembly=Microsoft.Phone.Maps"
xmlns:maptk="clr-namespace:Microsoft.Phone.Maps.Toolkit;assembly=Microsoft.Phone.Controls.Toolkit"

<maptk:Pushpin x:Name="MyLocation">

    <maptk:Pushpin.Template>
        <ControlTemplate>
            <Ellipse
                Width="15" 
                Height="15" 
                Margin="0" 
                Fill="SteelBlue" 
                StrokeThickness="1"
                Stroke="Black"/>
        </ControlTemplate>
    </maptk:Pushpin.Template>

</maptk:Pushpin>

But I cannot access the MyLocation pushpin in my MapPage.xaml (the debugger says it is null).

Can I display and update the current user position on the map with maptk:Pushpin?

In Windows Phone 7 I could simply create a XAML layout for the pushpin which would hold the user location like this:

xmlns:maps="clr-namespace:Microsoft.Phone.Controls.Maps;assembly=Microsoft.Phone.Controls.Maps"

<maps:Map Grid.Row="2" x:Name="Map" >

    <maps:Pushpin x:Name="MyLocation" >
        <maps:Pushpin.Template>
            <ControlTemplate>
                <Ellipse Width="12" 
                         Height="12" 
                         Margin="0" 
                         Fill="SteelBlue" 
                         StrokeThickness="1"
                         Stroke="Black"
                         />
            </ControlTemplate>
        </maps:Pushpin.Template>
    </maps:Pushpin>

</maps:Map>

then I could add a GeoCoordinateWatcher which would listen for the PositionChanged event and change the Location of the MyLocation pushpin:

void GeoCoordinateWatcher_PositionChanged ( object sender, GeoPositionChangedEventArgs<GeoCoordinate> e )
{
    MyLocation.Location = e.Position.Location;
}

回答1:

try this way,

Pushpin pushpin = new Pushpin();

pushpin.Background = new SolidColorBrush(Colors.Red);

pushpin.Location = new GeoCoordinate(Latitude, Longitude);

pushpin.Content = "SampleString";

pushpin.Width = 25;

map1.Children.Add(pushpin);//this is way add pushpin to map

Have visited this one .

http://social.msdn.microsoft.com/Forums/wpapps/en-US/3d95b0c5-5f48-4918-b761-f8302fa090c2/updatehow-to-show-pushpin-on-microsoftphonemapscontrolsmap#bbb42943-663b-41f1-a920-f7368f2fee70

来源：https://stackoverflow.com/questions/18977613/windows-phone-8-howto-display-current-position-on-the-map

标签

xaml

windows-phone-8

maps