[Android] Fix bug : Frame outline color not rendering (#1385)

* Fix issue G1347

* Add dispose _backgroundDrawable

* Replace OutlineColor by BorderColor

Xamarin.Forms.Controls.Issues/Xamarin.Forms.Controls.Issues.Shared/Issue1347.cs

@@ -0,0 +1,44 @@
+using Xamarin.Forms.CustomAttributes;
+using Xamarin.Forms.Internals;
+using System.Collections.ObjectModel;
+
+#if UITEST
+using Xamarin.UITest;
+using NUnit.Framework;
+#endif
+
+namespace Xamarin.Forms.Controls.Issues
+{
+	[Preserve(AllMembers = true)]
+	[Issue(IssueTracker.Github, 1347, "[Android] Frame outline color not rendering", PlatformAffected.Android)]
+	public class Issue1347 : TestContentPage
+	{
+		Label label;
+		Frame frame;
+		protected override void Init()
+		{
+			label = new Label() { Text = "The ouline color should be red", VerticalOptions = LayoutOptions.CenterAndExpand, HorizontalOptions = LayoutOptions.CenterAndExpand };
+			frame = new Frame
+			{
+				VerticalOptions = LayoutOptions.CenterAndExpand,
+				HorizontalOptions = LayoutOptions.CenterAndExpand,
+				HeightRequest = 300,
+				WidthRequest = 200,
+				BorderColor = Color.Red,
+				BackgroundColor = Color.LightBlue,
+				HasShadow = true,
+				Content = label
+			};
+
+			var tapGestureRecognizer = new TapGestureRecognizer();
+			tapGestureRecognizer.Tapped += (s, e) => {
+				frame.BorderColor = frame.BorderColor == Color.Default ? Color.Red : Color.Default;
+				frame.BackgroundColor = frame.BackgroundColor == Color.Default ? Color.LightBlue : Color.Default;
+				label.Text = frame.BorderColor == Color.Default ? "The ouline color should be default (click here to change color)" : "The ouline color should be red (click here to change color)";
+			};
+			frame.GestureRecognizers.Add(tapGestureRecognizer);
+
+			Content = frame;
+		}
+	}
+}

Xamarin.Forms.Controls.Issues/Xamarin.Forms.Controls.Issues.Shared/Xamarin.Forms.Controls.Issues.Shared.projitems

@@ -264,6 +264,7 @@
     <Compile Include="$(MSBuildThisFileDirectory)Issue1024.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Issue1025.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Issue1026.cs" />
+    <Compile Include="$(MSBuildThisFileDirectory)Issue1347.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Issue1356.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Issue1691.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Issue2983.cs" />

Xamarin.Forms.Platform.Android/FastRenderers/FrameRenderer.cs

@@ -1,6 +1,7 @@
 using System;
 using System.ComponentModel;
 using Android.Content;
+using Android.Graphics.Drawables;
 using Android.Support.V7.Widget;
 using Android.Views;
 using Xamarin.Forms.Platform.Android.FastRenderers;
@@ -17,6 +18,7 @@ namespace Xamarin.Forms.Platform.Android.FastRenderers
 
 		bool _disposed;
 		Frame _element;
+		GradientDrawable _backgroundDrawable;
 
 		VisualElementPackager _visualElementPackager;
 		VisualElementTracker _visualElementTracker;
@@ -125,7 +127,13 @@ namespace Xamarin.Forms.Platform.Android.FastRenderers
 					_visualElementPackager.Dispose();
 					_visualElementPackager = null;
 				}
-			
+				
+				if (_backgroundDrawable != null)
+				{
+					_backgroundDrawable.Dispose();
+					_backgroundDrawable = null;
+				}
+				
 				int count = ChildCount;
 				for (var i = 0; i < count; i++)
 				{
@@ -158,6 +166,9 @@ namespace Xamarin.Forms.Platform.Android.FastRenderers
 			if (e.NewElement != null)
 			{
 				this.EnsureId();
+				_backgroundDrawable = new GradientDrawable();
+				_backgroundDrawable.SetShape(ShapeType.Rectangle);
+				this.SetBackground(_backgroundDrawable);
 
 				if (_visualElementTracker == null)
 				{
@@ -170,6 +181,7 @@ namespace Xamarin.Forms.Platform.Android.FastRenderers
 				UpdateShadow();
 				UpdateBackgroundColor();
 				UpdateCornerRadius();
+				UpdateBorderColor();
 
 				ElevationHelper.SetElevation(this, e.NewElement);
 			}
@@ -211,6 +223,8 @@ namespace Xamarin.Forms.Platform.Android.FastRenderers
 				UpdateBackgroundColor();
 			else if (e.PropertyName == Frame.CornerRadiusProperty.PropertyName)
 				UpdateCornerRadius();
+			else if (e.PropertyName == Frame.BorderColorProperty.PropertyName)
+				UpdateBorderColor();
 		}
 
 		void UpdateBackgroundColor()
@@ -219,7 +233,16 @@ namespace Xamarin.Forms.Platform.Android.FastRenderers
 				return;
 				
 			Color bgColor = Element.BackgroundColor;
-			SetCardBackgroundColor(bgColor.IsDefault ? AColor.White : bgColor.ToAndroid());
+			_backgroundDrawable.SetColor(bgColor.IsDefault ? AColor.White : bgColor.ToAndroid());
+		}
+
+		void UpdateBorderColor()
+		{
+			if (_disposed)
+				return;
+
+			Color borderColor = Element.BorderColor;
+			_backgroundDrawable.SetStroke(3, borderColor.IsDefault ? AColor.White : borderColor.ToAndroid());
 		}
 
 		void UpdateShadow()
@@ -255,7 +278,7 @@ namespace Xamarin.Forms.Platform.Android.FastRenderers
 			else
 				cornerRadius = Context.ToPixels(cornerRadius);
 
-			Radius = cornerRadius;
+			_backgroundDrawable.SetCornerRadius(cornerRadius);
 		}
 	}
 }