CODEWITHSUNDEEP
androidxamarin.formsmaps
Joyce de Lanna
Joyce de Lanna

Reputation: 1543

why routeline doesn't appear? xamarin forms

This is my custom map (PCL)

public class CustomMap : Map
{
    public List<Position> RouteCoordinates { get; set; }

    public CustomMap()
    {
        RouteCoordinates = new List<Position>();
    }
}

this is My View (PCL)

[XamlCompilation(XamlCompilationOptions.Compile)]
public partial class ComoChegarView : ContentPage
{
    Localizacao userLocal;

    public ComoChegarView(double lat, double longi)
    {
        userLocal = new Localizacao();
        Task.Run(async () => await getUserLocal()).Wait();
        Localizacao lojaLocal =  new Localizacao();
        lojaLocal.latitude = lat;
        lojaLocal.longitude = longi;

        InitializeComponent();

        //route
        var customMap = new CustomMap
        {
            IsShowingUser = true,
            HeightRequest = 100,
            WidthRequest = 960,
        };
             Content = customMap;

        customMap.RouteCoordinates.Add(new Position(userLocal.latitude, userLocal.longitude));
        customMap.RouteCoordinates.Add(new Position(lojaLocal.latitude, lojaLocal.longitude));
        customMap.MoveToRegion(MapSpan.FromCenterAndRadius(new Position(userLocal.latitude, userLocal.longitude), Distance.FromMiles(1.0)));
    }

and this is my CustomMapRenderer (Android)

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

using Android.App;
using Android.Content;
using Android.OS;
using Android.Runtime;
using Android.Views;
using Android.Widget;
using neoFly_Montana;
using neoFly_Montana.Droid;
using Xamarin.Forms;
using Xamarin.Forms.Maps.Android;
using Android.Gms.Maps;
using Xamarin.Forms.Maps;
using Android.Gms.Maps.Model;

[assembly: ExportRenderer(typeof(CustomMap), typeof(CustomMapRenderer))]
namespace neoFly_Montana.Droid
{
public class CustomMapRenderer : MapRenderer, IOnMapReadyCallback
{
    GoogleMap map;
    List<Position> routeCoordinates;

    protected override void OnElementChanged(Xamarin.Forms.Platform.Android.ElementChangedEventArgs<Map> e)
    {
        base.OnElementChanged(e);

        if (e.OldElement != null)
        {
            // Unsubscribe
        }

        void OnMapReady(GoogleMap googleMap)
        {
            map = googleMap;

            var polylineOptions = new PolylineOptions();
            polylineOptions.InvokeColor(0x66FF0000);

            foreach (var position in routeCoordinates)
            {
                polylineOptions.Add(new LatLng(position.Latitude, position.Longitude));
            }

            map.AddPolyline(polylineOptions);
        }

        if (e.NewElement != null)
        {
            var formsMap = (CustomMap)e.NewElement;
            routeCoordinates = formsMap.RouteCoordinates;

            ((MapView)Control).GetMapAsync(this);
        }
    }


}
}

the OnMapReady is not called and I don't know why. I am using xamarin.forms the map works, only the line doesn't Will it draw a line that follow the streets and turn correctly or do I need set the points where it should turn? I really need your answer

Please, help me!

Upvotes: 1

Views: 48

Answers (1)

Grace Feng
Grace Feng

Reputation: 16652

You've placed your OnMapReady inside of the OnElementChanged? Is this a typo of your question? Try to get it out of OnElementChanged.

If the routeline doesn't show, it's possible that you didn't add the right key in Android's manifest:

<meta-data android:name="com.google.android.maps.v2.API_KEY" android:value="XXXXXXXXXXXXXXX" />

To get this key, you may refer to the doc Obtaining a Google Maps API Key.

Upvotes: 1

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