I'm still fairly new to Visual Studio/Xamarin but I had a simple OpenStreetMap sample running awhile ago for Android that did display a map but that doesn't seem to display map anymore though I haven't changed the code for this sample in awhile as far as I recall. I'm not sure if some Visual Studio/Xamarin or MacOS update might have caused it to not work anymore.
I'm using Visual Studio for Mac community 8.4.4 (build 91) on macOS Mojava 10.14.6 and the following Packages:
My MainActivity.cs
file contains the following code:
using System;
using Android.App;
using Android.OS;
using Android.Runtime;
using Android.Support.Design.Widget;
using Android.Support.V7.App;
using Android.Views;
using Android.Widget;
using Mapsui;
using Mapsui.Geometries;
using Mapsui.Projection;
using Mapsui.Styles;
using Mapsui.Utilities;
using Mapsui.UI.Android;
using Mapsui.Widgets.ScaleBar;
using Mapsui.Widgets.Zoom;
using Xamarin.Essentials;
namespace mvp_android
{
[Activity(Label = "@string/app_name", Theme = "@style/AppTheme.NoActionBar", MainLauncher = true)]
public class MainActivity : AppCompatActivity
{
protected override void OnCreate(Bundle savedInstanceState)
{
base.OnCreate(savedInstanceState);
Xamarin.Essentials.Platform.Init(this, savedInstanceState);
SetContentView(Resource.Layout.Main);
var mapControl = FindViewById<MapControl>(Resource.Id.mapcontrol);
var map = new Mapsui.Map();
map.Layers.Add(OpenStreetMap.CreateTileLayer());
map.Widgets.Add(
new ZoomInOutWidget(map) {
HorizontalAlignment = Mapsui.Widgets.HorizontalAlignment.Left,
VerticalAlignment = Mapsui.Widgets.VerticalAlignment.Top,
Orientation = Mapsui.Widgets.Zoom.Orientation.Horizontal,
}
);
var centerOfLondonOntario = new Point(-81.2497, 42.9837);
map.NavigateTo(SphericalMercator.FromLonLat(centerOfLondonOntario.X, centerOfLondonOntario.Y));
map.NavigateTo(map.Resolutions[9]);
mapControl.Map = map;
}
public override bool OnCreateOptionsMenu(IMenu menu)
{
MenuInflater.Inflate(Resource.Menu.menu_main, menu);
return true;
}
public override bool OnOptionsItemSelected(IMenuItem item)
{
int id = item.ItemId;
if (id == Resource.Id.action_settings)
{
return true;
}
return base.OnOptionsItemSelected(item);
}
private void FabOnClick(object sender, EventArgs eventArgs)
{
View view = (View)sender;
Snackbar.Make(view, "Replace with your own action", Snackbar.LengthLong)
.SetAction("Action", (Android.Views.View.IOnClickListener)null).Show();
}
public override void OnRequestPermissionsResult(int requestCode, string[] permissions, [GeneratedEnum] Android.Content.PM.Permission[] grantResults)
{
Xamarin.Essentials.Platform.OnRequestPermissionsResult(requestCode, permissions, grantResults);
base.OnRequestPermissionsResult(requestCode, permissions, grantResults);
}
}
}
And my Main.xml
contains the following code:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<Mapsui.UI.Android.MapControl
android:id="@+id/mapcontrol"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</LinearLayout>
Originally, this sample showed the OpenStreetMap's map centering on the London, Ontario location with zoom in/out buttons, but now it just shows a white where the map should be, still shows the zoom in/out buttons and does display the (c)OpenStreetMap watermark.
What am I missing here?
The version of BruTile used in Mapsui 1.4.8 did not send the user-agent as part of it's request and at some point the openstreetmap server started blocking requests for this reason.
As a workaround you could create a custom ITileSource as described here by Matt Schneeberger: https://github.com/Mapsui/Mapsui/issues/668#issuecomment-497947690
Also, I noticed that Mapsui 2.0 is in development, but not showing in my Visual Studio/Xamarin when selecting the Nget Packages. Will it become available in Nget once it's out of beta?
Thank you for pointing me into the right direction! The map displays fine now again.
Yes, this is prerelease, to see it in your nuget browser you have to check 'included prerelese'.