diff --git a/Ooui.Forms/Exports.cs b/Ooui.Forms/Exports.cs
index c8f3f60..8ad9c7e 100644
--- a/Ooui.Forms/Exports.cs
+++ b/Ooui.Forms/Exports.cs
@@ -5,6 +5,7 @@ using Xamarin.Forms;
 using Xamarin.Forms.Internals;
 
 [assembly: Dependency (typeof (ResourcesProvider))]
+[assembly: ExportRenderer (typeof (ActivityIndicator), typeof (ActivityIndicatorRenderer))]
 [assembly: ExportRenderer (typeof (BoxView), typeof (BoxRenderer))]
 [assembly: ExportRenderer (typeof (Button), typeof (ButtonRenderer))]
 [assembly: ExportRenderer (typeof (Entry), typeof (EntryRenderer))]
diff --git a/Ooui.Forms/Renderers/ActivityIndicatorRenderer.cs b/Ooui.Forms/Renderers/ActivityIndicatorRenderer.cs
index 8f7373c..e2dec9d 100644
--- a/Ooui.Forms/Renderers/ActivityIndicatorRenderer.cs
+++ b/Ooui.Forms/Renderers/ActivityIndicatorRenderer.cs
@@ -1,10 +1,67 @@
 using System;
+using System.ComponentModel;
+using System.Linq;
+using Xamarin.Forms;
+
 namespace Ooui.Forms.Renderers
 {
-    public class ActivityIndicatorRenderer
+    public class ActivityIndicatorRenderer : ViewRenderer<ActivityIndicator, Div>
     {
-        public ActivityIndicatorRenderer ()
+        public override SizeRequest GetDesiredSize (double widthConstraint, double heightConstraint)
         {
+            var size = new Size (40, 20);
+            return new SizeRequest (size, size);
+        }
+
+        protected override void OnElementChanged (ElementChangedEventArgs<ActivityIndicator> e)
+        {
+            if (e.NewElement != null) {
+                if (Control == null) {
+                    var p = new Div { ClassName = "progress" };
+                    var pb = new Div { ClassName = "progress-bar progress-bar-striped" };
+                    pb.SetAttribute ("role", "progressbar");
+                    pb.SetAttribute ("aria-valuenow", "0");
+                    pb.SetAttribute ("aria-valuemin", "0");
+                    pb.SetAttribute ("aria-valuemax", "100");
+                    pb.Style.Width = "0%";
+                    p.AppendChild (pb);
+                    SetNativeControl (p);
+                }
+
+                UpdateColor ();
+                UpdateIsRunning ();
+            }
+
+            base.OnElementChanged (e);
+        }
+
+        protected override void OnElementPropertyChanged (object sender, PropertyChangedEventArgs e)
+        {
+            base.OnElementPropertyChanged (sender, e);
+
+            if (e.PropertyName == ActivityIndicator.ColorProperty.PropertyName)
+                UpdateColor ();
+            else if (e.PropertyName == ActivityIndicator.IsRunningProperty.PropertyName)
+                UpdateIsRunning ();
+        }
+
+        void UpdateColor ()
+        {
+        }
+
+        void UpdateIsRunning ()
+        {
+            var pb = (Div)Control.Children[0];
+            if (Element.IsRunning) {
+                pb.SetAttribute ("aria-valuenow", "100");
+                pb.Style.Width = "100%";
+                pb.ClassName = "progress-bar progress-bar-striped active";
+            }
+            else {
+                pb.SetAttribute ("aria-valuenow", "0");
+                pb.Style.Width = "0%";
+                pb.ClassName = "progress-bar progress-bar-striped";
+            }
         }
     }
 }
diff --git a/Ooui.Forms/Renderers/ViewRenderer.cs b/Ooui.Forms/Renderers/ViewRenderer.cs
index 75dfb02..edbe129 100644
--- a/Ooui.Forms/Renderers/ViewRenderer.cs
+++ b/Ooui.Forms/Renderers/ViewRenderer.cs
@@ -100,11 +100,8 @@ namespace Ooui.Forms.Renderers
         public override void SetControlSize (Size size)
         {
             if (Control != null) {
-                //Control.Style.Position = "absolute";
-                //Control.Style.Left = "0px";
-                //Control.Style.Top = "0px";
-                Control.Style.Width = size.Width + "px";
-                Control.Style.Height = size.Height + "px";
+                Control.Style.Width = size.Width;
+                Control.Style.Height = size.Height;
             }
         }
 
diff --git a/Samples/DisplayAlertPage.xaml b/Samples/DisplayAlertPage.xaml
index 8f3c57f..0caca42 100644
--- a/Samples/DisplayAlertPage.xaml
+++ b/Samples/DisplayAlertPage.xaml
@@ -5,6 +5,7 @@
     <ContentPage.Content>
         <StackLayout>
             <Label Text="Welcome to DisplayAlert Sample!" />
+            <ActivityIndicator x:Name="activity" />
             <Button Text="Tap for Display Alert"
                     Clicked="OnButtonClicked" />
         </StackLayout>
diff --git a/Samples/DisplayAlertPage.xaml.cs b/Samples/DisplayAlertPage.xaml.cs
index dd7f8e9..6274a8d 100644
--- a/Samples/DisplayAlertPage.xaml.cs
+++ b/Samples/DisplayAlertPage.xaml.cs
@@ -16,8 +16,10 @@ namespace Samples
 
         public async void OnButtonClicked(object sender, EventArgs args)
         {
+            activity.IsRunning = true;
             var result = await DisplayAlert("Alert Message", "Lorem ipsum dolor sit amet, consectetur adipiscing elit. Integer nec odio. Praesent libero. Sed cursus ante dapibus diam. Sed nisi. Nulla quis sem at nibh elementum imperdiet. Duis sagittis ipsum. Praesent mauris. Fusce nec tellus sed augue semper porta. Mauris massa.", "YES", "NO");
             await DisplayAlert("Alert Response", $"You selected value: {result}", "OK");
+            activity.IsRunning = false;
         }
     }
 }