Add blur library for android

Author: yauhenipakala

samples/BlurViewFormsSample/BlurViewFormsSample/BlurViewFormsSample.Android/BlurViewFormsSample.Android.csproj

@@ -48,6 +48,9 @@
     <Reference Include="System.Xml" />
   </ItemGroup>
   <ItemGroup>
+    <PackageReference Include="Xamarin.BlurView">
+      <Version>1.3.4</Version>
+    </PackageReference>
     <PackageReference Include="Xamarin.Forms" Version="3.0.0.482510" />
     <PackageReference Include="Xamarin.Android.Support.Design" Version="27.0.2" />
     <PackageReference Include="Xamarin.Android.Support.v7.AppCompat" Version="27.0.2" />

samples/BlurViewFormsSample/BlurViewFormsSample/BlurViewFormsSample.Android/FormsBlurViewRenderer.cs

@@ -0,0 +1,49 @@
+using Android.App;
+using Android.Content;
+using Android.Views;
+using Android.Widget;
+
+using Xamarin.Forms;
+using Xamarin.Forms.Platform.Android;
+
+using Com.EightbitLab.BlurViewBinding;
+
+using BlurViewFormsSample;
+using BlurViewFormsSample.Droid;
+
+[assembly: ExportRenderer(typeof(FormsBlurView), typeof(FormsBlurViewRenderer))]
+
+namespace BlurViewFormsSample.Droid
+{
+    public class FormsBlurViewRenderer : ViewRenderer<FormsBlurView, FrameLayout>
+    {
+        public FormsBlurViewRenderer(Context context) : base(context)
+        {
+        }
+
+        protected override void OnElementChanged(ElementChangedEventArgs<FormsBlurView> e)
+        {
+            base.OnElementChanged(e);
+
+            if (Control == null)
+            {
+                var context = Context;
+                var activity = context as Activity;
+
+                var rootView = (ViewGroup) activity.Window.DecorView.FindViewById(Android.Resource.Id.Content);
+                var windowBackground = activity.Window.DecorView.Background;
+
+                var blurView = new BlurView(context);
+
+                blurView.SetOverlayColor(Resource.Color.colorOverlay);
+
+                blurView.SetupWith(rootView)
+                   .WindowBackground(windowBackground)
+                   .BlurAlgorithm(new RenderScriptBlur(context))
+                   .BlurRadius(10f);
+
+                SetNativeControl(blurView);
+            }
+        }
+    }
+}

samples/BlurViewFormsSample/BlurViewFormsSample/BlurViewFormsSample/FormsBlurView.cs

@@ -0,0 +1,14 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+using Xamarin.Forms;
+
+namespace BlurViewFormsSample
+{
+	public class FormsBlurView : StackLayout
+    {
+	
+	}
+}

samples/BlurViewFormsSample/BlurViewFormsSample/BlurViewFormsSample/MainPage.xaml

@@ -4,5 +4,26 @@
              xmlns:local="clr-namespace:BlurViewFormsSample"
              x:Class="BlurViewFormsSample.MainPage">
 
+    <ScrollView>
+        <StackLayout BackgroundColor="Red">
+            <Label Text="Welcome to Xamarin.Forms!" HorizontalOptions="Center" VerticalOptions="CenterAndExpand" />
+
+            <local:FormsBlurView HeightRequest="100">
+                <Label Text="Test Text" />
+                <Button Text="Click me!" />
+            </local:FormsBlurView>
+
+            <BoxView BackgroundColor="Blue" HeightRequest="100" />
+            <BoxView BackgroundColor="Blue" HeightRequest="100" />
+            <BoxView BackgroundColor="Blue" HeightRequest="100" />
+            <BoxView BackgroundColor="Blue" HeightRequest="100" />
+            <BoxView BackgroundColor="Blue" HeightRequest="100" />
+            <BoxView BackgroundColor="Blue" HeightRequest="100" />
+            <BoxView BackgroundColor="Blue" HeightRequest="100" />
+            <BoxView BackgroundColor="Blue" HeightRequest="100" />
+            <BoxView BackgroundColor="Blue" HeightRequest="100" />
+            <BoxView BackgroundColor="Blue" HeightRequest="100" />
+        </StackLayout>
+    </ScrollView>
 
 </ContentPage>