Since a long time, I'm trying to make work a polyline for crossplateform using. I did it and it works well, I followed the Map Control tutorial in first, and then Highlight a Route on a Map tutorial.
I then update the code to make it reloads if a any changes comes, however, I'm getting an issue and I couldn't figure it out... It does works for Android & iOS.
polyline.Path = new Geopath(coordinates); throws Catastrophic failure (Exception from HRESULT: 0x8000FFFF (E_UNEXPECTED))
The problem is that my two others renderer (Android & iOS) works.. Maybe something isn't possible because I work with WinPhone8.1 unlike the tutorial, which is UWP.
public class CustomMapRenderer : MapRenderer
{
MapControl nativeMap;
CustomMap formsMap;
protected override void OnElementChanged(ElementChangedEventArgs<Map> e)
{
base.OnElementChanged(e);
if (e.OldElement != null)
{
nativeMap = Control as MapControl;
}
if (e.NewElement != null)
{
formsMap = (CustomMap)e.NewElement;
nativeMap = Control as MapControl;
UpdatePolyLine();
}
}
protected override void OnElementPropertyChanged(object sender, System.ComponentModel.PropertyChangedEventArgs e)
{
base.OnElementPropertyChanged(sender, e);
if (this.Element == null || this.Control == null)
return;
if (e.PropertyName == CustomMap.RouteCoordinatesProperty.PropertyName)
{
UpdatePolyLine();
}
}
private void UpdatePolyLine()
{
if (nativeMap != null)
{
var coordinates = new List<BasicGeoposition>();
foreach (var position in formsMap.RouteCoordinates)
{
coordinates.Add(new BasicGeoposition() { Latitude = position.Latitude, Longitude = position.Longitude });
}
var polyline = new MapPolyline();
polyline.StrokeColor = Color.FromArgb(128, 255, 0, 0);
polyline.StrokeThickness = 5;
polyline.Path = new Geopath(coordinates);
nativeMap.MapElements.Add(polyline);
}
}
}
I also read that a key is needed, so maybe I doesn't use this key in a good way.. I tried with UWP Public Key and WinPhone8.X and earlier Key, but without success too..
Does someone has an idea? This part a really big problem in my app..
Thank in advance !
After a long time, I found why it didn't works...
If you're doing like me, if you do a HttpRequest
to something as Google Direction API, then the result will comes after the first passage in the OnElementChanged()
.
Because formsMap.RouteCoordinates
isn't null
but empty, the Catastrophic failure (Exception from HRESULT: 0x8000FFFF (E_UNEXPECTED))
is thrown..
This is the good CustomMapRenderer
for PolyLine use
using PROJECT;
using PROJECT.UWP;
using System.Collections.Generic;
using Windows.Devices.Geolocation;
using Windows.UI.Xaml.Controls.Maps;
using Xamarin.Forms.Maps;
using Xamarin.Forms.Maps.UWP;
using Xamarin.Forms.Platform.UWP;
[assembly: ExportRenderer(typeof(CustomMap), typeof(CustomMapRenderer))]
namespace PROJECT.UWP
{
public class CustomMapRenderer : MapRenderer
{
MapControl nativeMap;
CustomMap formsMap;
protected override void OnElementChanged(ElementChangedEventArgs<Map> e)
{
base.OnElementChanged(e);
if (e.OldElement != null)
{
nativeMap = Control as MapControl;
}
if (e.NewElement != null)
{
formsMap = (CustomMap)e.NewElement;
nativeMap = Control as MapControl;
UpdatePolyLine();
}
}
protected override void OnElementPropertyChanged(object sender, System.ComponentModel.PropertyChangedEventArgs e)
{
base.OnElementPropertyChanged(sender, e);
if (this.Element == null || this.Control == null)
return;
if (e.PropertyName == CustomMap.RouteCoordinatesProperty.PropertyName)
{
UpdatePolyLine();
}
}
private void UpdatePolyLine()
{
if (formsMap != null && formsMap.RouteCoordinates.Count > 0)
{
List<BasicGeoposition> coordinates = new List<BasicGeoposition>();
foreach (var position in formsMap.RouteCoordinates)
{
coordinates.Add(new BasicGeoposition() { Latitude = position.Latitude, Longitude = position.Longitude });
}
Geopath path = new Geopath(coordinates);
MapPolyline polyline = new MapPolyline();
polyline.StrokeColor = Windows.UI.Color.FromArgb(128, 255, 0, 0);
polyline.StrokeThickness = 5;
polyline.Path = path;
nativeMap.MapElements.Add(polyline);
}
}
}
}
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