[Android] Remove the ". " on empty labels (Accessibility) on Fastrenderers (#915)

* [Android] Concatenate Name/HelpText better

Also remove some parameters that were added to workaround an issue that
no longer exists.

* Add repro

* Listen to Stephane

he's usually right

* oops, didn't save

1 files changed, 21 insertions, 23 deletions

diff --git a/Xamarin.Forms.Platform.Android/FastRenderers/AutomationPropertiesProvider.cs b/Xamarin.Forms.Platform.Android/FastRenderers/AutomationPropertiesProvider.cs
index 6d34c6b5..6cd158ff 100644
--- a/Xamarin.Forms.Platform.Android/FastRenderers/AutomationPropertiesProvider.cs
+++ b/Xamarin.Forms.Platform.Android/FastRenderers/AutomationPropertiesProvider.cs
@@ -6,7 +6,6 @@ namespace Xamarin.Forms.Platform.Android.FastRenderers
 {
 	internal class AutomationPropertiesProvider : IDisposable 
 	{
-		const string GetFromElement = "GetValueFromElement";
 		string _defaultContentDescription;
 		bool? _defaultFocusable;
 		string _defaultHint;
@@ -49,18 +48,14 @@ namespace Xamarin.Forms.Platform.Android.FastRenderers
 			}
 		}
 
-		void SetAutomationId(string id = GetFromElement)
+		void SetAutomationId()
 		{
 			if (Element == null || Control == null)
 			{
 				return;
 			}
 
-			string value = id;
-			if (value == GetFromElement)
-			{
-				value = Element.AutomationId;
-			}
+			string value = Element.AutomationId;
 
 			if (!string.IsNullOrEmpty(value))
 			{
@@ -68,7 +63,7 @@ namespace Xamarin.Forms.Platform.Android.FastRenderers
 			}
 		}
 
-		void SetContentDescription(string contentDescription = GetFromElement)
+		void SetContentDescription()
 		{
 			if (Element == null || Control == null)
 			{
@@ -85,12 +80,7 @@ namespace Xamarin.Forms.Platform.Android.FastRenderers
 				_defaultContentDescription = Control.ContentDescription;
 			}
 
-			string value = contentDescription;
-			if (value == GetFromElement)
-			{
-				value = string.Join(" ", (string)Element.GetValue(AutomationProperties.NameProperty),
-					(string)Element.GetValue(AutomationProperties.HelpTextProperty));
-			}
+			string value = ConcatenateNameAndHelpText(Element);
 
 			if (!string.IsNullOrWhiteSpace(value))
 			{
@@ -102,7 +92,7 @@ namespace Xamarin.Forms.Platform.Android.FastRenderers
 			}
 		}
 
-		void SetFocusable(bool? value = null)
+		void SetFocusable()
 		{
 			if (Element == null || Control == null)
 			{
@@ -115,10 +105,10 @@ namespace Xamarin.Forms.Platform.Android.FastRenderers
 			}
 
 			Control.Focusable =
-				(bool)(value ?? (bool?)Element.GetValue(AutomationProperties.IsInAccessibleTreeProperty) ?? _defaultFocusable);
+				(bool)((bool?)Element.GetValue(AutomationProperties.IsInAccessibleTreeProperty) ?? _defaultFocusable);
 		}
 
-		bool SetHint(string hint = GetFromElement)
+		bool SetHint()
 		{
 			if (Element == null || Control == null)
 			{
@@ -142,18 +132,26 @@ namespace Xamarin.Forms.Platform.Android.FastRenderers
 				_defaultHint = textView.Hint;
 			}
 
-			string value = hint;
-			if (value == GetFromElement)
-			{
-				value = string.Join(". ", (string)Element.GetValue(AutomationProperties.NameProperty),
-					(string)Element.GetValue(AutomationProperties.HelpTextProperty));
-			}
+			string value = ConcatenateNameAndHelpText(Element);
 
 			textView.Hint = !string.IsNullOrWhiteSpace(value) ? value : _defaultHint;
 
 			return true;
 		}
 
+		internal static string ConcatenateNameAndHelpText(Element Element)
+		{
+			var name = (string)Element.GetValue(AutomationProperties.NameProperty);
+			var helpText = (string)Element.GetValue(AutomationProperties.HelpTextProperty);
+
+			if (string.IsNullOrWhiteSpace(name))
+				return helpText;
+			if (string.IsNullOrWhiteSpace(helpText))
+				return name;
+
+			return $"{name}. {helpText}";
+		}
+
 		void SetLabeledBy()
 		{
 			if (Element == null || Control == null)