[Android] Update webview to use correct value for WebNavigationEvent (#7089)

* Update Android webview to return correct WebNavigationEvent value

* set _eventState on load

Xamarin.Forms.Platform.Android/Renderers/FormsWebViewClient.cs

@@ -69,7 +69,7 @@ namespace Xamarin.Forms.Platform.Android
 
 			if (navigate)
 			{
-				var args = new WebNavigatedEventArgs(WebNavigationEvent.NewPage, source, url, _navigationResult);
+				var args = new WebNavigatedEventArgs(_renderer.GetCurrentWebNavigationEvent(), source, url, _navigationResult);
 				_renderer.ElementController.SendNavigated(args);
 			}
 

Xamarin.Forms.Platform.Android/Renderers/WebViewRenderer.cs

@@ -15,6 +15,7 @@ namespace Xamarin.Forms.Platform.Android
 	{
 		public const string AssetBaseUrl = "file:///android_asset/";
 
+		WebNavigationEvent _eventState;
 		WebViewClient _webViewClient;
 		FormsWebChromeClient _webChromeClient;
 		bool _isDisposed = false;
@@ -36,13 +37,17 @@ namespace Xamarin.Forms.Platform.Android
 
 		public void LoadHtml(string html, string baseUrl)
 		{
+			_eventState = WebNavigationEvent.NewPage;
 			Control.LoadDataWithBaseURL(baseUrl ?? AssetBaseUrl, html, "text/html", "UTF-8", null);
 		}
 
 		public void LoadUrl(string url)
 		{
 			if (!SendNavigatingCanceled(url))
+			{
+				_eventState = WebNavigationEvent.NewPage;
 				Control.LoadUrl(url);
+			}	
 		}
 
 		protected internal bool SendNavigatingCanceled(string url)
@@ -53,7 +58,7 @@ namespace Xamarin.Forms.Platform.Android
 			if (url == AssetBaseUrl)
 				return false;
 
-			var args = new WebNavigatingEventArgs(WebNavigationEvent.NewPage, new UrlWebViewSource { Url = url }, url);
+			var args = new WebNavigatingEventArgs(_eventState, new UrlWebViewSource { Url = url }, url);
 			ElementController.SendNavigating(args);
 			UpdateCanGoBackForward();
 			UrlCanceled = args.Cancel ? null : url;
@@ -106,6 +111,11 @@ namespace Xamarin.Forms.Platform.Android
 			return new AWebView(Context);
 		}
 
+		internal WebNavigationEvent GetCurrentWebNavigationEvent()
+		{
+			return _eventState;
+		}
+
 		protected override void OnElementChanged(ElementChangedEventArgs<WebView> e)
 		{
 			base.OnElementChanged(e);
@@ -210,7 +220,10 @@ namespace Xamarin.Forms.Platform.Android
 		void OnGoBackRequested(object sender, EventArgs eventArgs)
 		{
 			if (Control.CanGoBack())
+			{
+				_eventState = WebNavigationEvent.Back;
 				Control.GoBack();
+			}	
 
 			UpdateCanGoBackForward();
 		}
@@ -218,13 +231,17 @@ namespace Xamarin.Forms.Platform.Android
 		void OnGoForwardRequested(object sender, EventArgs eventArgs)
 		{
 			if (Control.CanGoForward())
+			{
+				_eventState = WebNavigationEvent.Forward;
 				Control.GoForward();
+			}	
 
 			UpdateCanGoBackForward();
 		}
 
 		void OnReloadRequested(object sender, EventArgs eventArgs)
 		{
+			_eventState = WebNavigationEvent.Refresh;
 			Control.Reload();
 		}