Xamarin.Forms Challenge Submission from John Bijsterbosch

src/TravelMonkey.Android/Effects/TextViewShadowEffect.cs

@@ -0,0 +1,41 @@
+using Android.Graphics;
+using Android.Widget;
+using System;
+using System.Linq;
+using TravelMonkey.Droid.Effects;
+using TravelMonkey.Effects;
+using Xamarin.Forms.Platform.Android;
+
+[assembly: Xamarin.Forms.ExportEffect(typeof(TextViewShadowEffect), nameof(ShadowEffect))]
+namespace TravelMonkey.Droid.Effects
+{
+	public class TextViewShadowEffect : PlatformEffect
+	{
+		protected override void OnAttached()
+		{
+			try
+			{
+				var effect = (ShadowEffect)Element.Effects.FirstOrDefault(e => e is ShadowEffect);
+				if (effect == null) return;
+
+				float radius = effect.Radius;
+				float distanceX = effect.DistanceX;
+				float distanceY = effect.DistanceY;
+				Color color = effect.Color.ToAndroid();
+
+				if (Control is TextView textView)
+				{
+					textView.SetShadowLayer(radius, distanceX, distanceY, color);
+				}
+			}
+			catch (Exception ex)
+			{
+				Console.WriteLine("Cannot set property on attached control. Error: ", ex.Message);
+			}
+		}
+
+		protected override void OnDetached()
+		{
+		}
+	}
+}

src/TravelMonkey.Android/MainActivity.cs

@@ -3,10 +3,11 @@
 using Android.Runtime;
 using Android.OS;
 
+[assembly: Xamarin.Forms.ResolutionGroupName("TravelMonkey")]
 namespace TravelMonkey.Droid
 {
     [Activity(Label = "TravelMonkey", Icon = "@mipmap/ic_launcher", Theme = "@style/MainTheme", MainLauncher = true, ConfigurationChanges = ConfigChanges.ScreenSize | ConfigChanges.Orientation)]
-    public class MainActivity : global::Xamarin.Forms.Platform.Android.FormsAppCompatActivity
+    public class MainActivity : Xamarin.Forms.Platform.Android.FormsAppCompatActivity
     {
         protected override void OnCreate(Bundle savedInstanceState)
         {
@@ -16,11 +17,12 @@ protected override void OnCreate(Bundle savedInstanceState)
             base.OnCreate(savedInstanceState);
 
             Xamarin.Essentials.Platform.Init(this, savedInstanceState);
-            global::Xamarin.Forms.Forms.Init(this, savedInstanceState);
+            Xamarin.Forms.Forms.Init(this, savedInstanceState);
             Acr.UserDialogs.UserDialogs.Init(this);
 
             LoadApplication(new App());
         }
+
         public override void OnRequestPermissionsResult(int requestCode, string[] permissions, [GeneratedEnum] Permission[] grantResults)
         {
             Xamarin.Essentials.Platform.OnRequestPermissionsResult(requestCode, permissions, grantResults);