custom thumb on slider for android

src/Android/Android.csproj

@@ -81,6 +81,7 @@
   <ItemGroup>
     <Compile Include="AutofillActivity.cs" />
     <Compile Include="AutofillCredentials.cs" />
+    <Compile Include="Controls\CustomSliderRenderer.cs" />
     <Compile Include="FirebaseInstanceIdService.cs" />
     <Compile Include="FirebaseMessagingService.cs" />
     <Compile Include="Autofill\Field.cs" />
@@ -134,6 +135,9 @@
     <None Include="increment-version.ps1" />
     <None Include="Resources\AboutResources.txt" />
     <None Include="Assets\AboutAssets.txt" />
+    <AndroidResource Include="Resources\drawable\slider_thumb.xml">
+      <SubType>Designer</SubType>
+    </AndroidResource>
     <AndroidResource Include="Resources\layout\tabs.axml">
       <SubType>AndroidResource</SubType>
     </AndroidResource>

src/Android/Controls/CustomSliderRenderer.cs

@@ -0,0 +1,27 @@
+using System;
+using Bit.Android.Controls;
+using Xamarin.Forms;
+using Android.Content;
+using Xamarin.Forms.Platform.Android;
+using Android.Support.V4.Content.Res;
+
+[assembly: ExportRenderer(typeof(Slider), typeof(CustomSliderRenderer))]
+namespace Bit.Android.Controls
+{
+    public class CustomSliderRenderer : SliderRenderer
+    {
+        public CustomSliderRenderer(Context context)
+            : base(context)
+        { }
+
+        protected override void OnElementChanged(ElementChangedEventArgs<Slider> e)
+        {
+            base.OnElementChanged(e);
+            if(Control != null)
+            {
+                var thumb = ResourcesCompat.GetDrawable(Resources, Resource.Drawable.slider_thumb, null);
+                Control.SetThumb(thumb);
+            }
+        }
+    }
+}

src/Android/Resources/drawable/slider_thumb.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8"?>
+<shape xmlns:android="http://schemas.android.com/apk/res/android" android:shape="oval">
+  <solid android:color="@color/white"/>
+  <stroke android:width="2dp" android:color="#B5B5B5"/>
+  <size android:width="28dp" android:height="28dp"/>
+</shape>