Launcher.cs

public static partial class Launcher
{
   public static async Task<bool> LaunchUriAsync(Uri uri)
   {
      try
      {
#if __IOS__
         return UIKit.UIApplication.SharedApplication.OpenUrl(new global::Foundation.NSUrl(uri.OriginalString));
#elif __ANDROID__
         var androidUri = global::Android.Net.Uri.Parse(uri.OriginalString);
         var intent = new global::Android.Content.Intent(global::Android.Content.Intent.ActionView, androidUri);

         ((Android.App.Activity)Uno.UI.ContextHelper.Current).StartActivity(intent);

         return true;
#elif __WASM__
         var command = $"Uno.UI.WindowManager.current.open(\"{uri.OriginalString}\");";
         var result = Uno.Foundation.WebAssemblyRuntime.InvokeJS(command);
         return result == "True";
#else
         throw new NotImplementedException();
#endif
      }
      catch (Exception exception)
      {
         if (typeof(Launcher).Log().IsEnabled(LogLevel.Error))
         {
            typeof(Launcher).Log().Error($"Failed to {nameof(LaunchUriAsync)}.", exception);
         }

         return false;
      }
   }
}