Expand Android url's which can be cancelled

Author: SKLn-Rad

SampleApp/SampleApp.Droid/SampleApp.Droid.csproj.user

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <Project ToolsVersion="14.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
   <PropertyGroup>
-    <SelectedDevice>Nexus_9_API_26</SelectedDevice>
-    <DefaultDevice>Nexus_9_API_26</DefaultDevice>
+    <SelectedDevice>HUAWEI MHA-L09</SelectedDevice>
+    <DefaultDevice>Android_5</DefaultDevice>
   </PropertyGroup>
 </Project>

SampleApp/SampleApp.UWP/App.xaml.cs

@@ -1,9 +1,12 @@
 using System;
+using System.Collections.Generic;
+using System.Reflection;
 using Windows.ApplicationModel;
 using Windows.ApplicationModel.Activation;
 using Windows.UI.Xaml;
 using Windows.UI.Xaml.Controls;
 using Windows.UI.Xaml.Navigation;
+using Xam.Plugin.WebView.Abstractions;
 using Xam.Plugin.WebView.UWP;
 
 namespace SampleApp.UWP
@@ -50,6 +53,7 @@ protected override void OnLaunched(LaunchActivatedEventArgs e)
                 rootFrame.NavigationFailed += OnNavigationFailed;
 
                 FormsWebViewRenderer.Initialize();
+                
                 Xamarin.Forms.Forms.Init(e);
 
                 if (e.PreviousExecutionState == ApplicationExecutionState.Terminated)

SampleApp/SampleApp.UWP/SampleApp.UWP.csproj.user

@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="15.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)' == 'Debug|x86'">
+    <DebugEngines>
+    </DebugEngines>
+    <BackgroundTaskDebugEngines>
+    </BackgroundTaskDebugEngines>
+  </PropertyGroup>
+</Project>

Xam.Plugin.WebView.Droid/FormsWebViewChromeClient.cs

@@ -22,5 +22,6 @@ public FormsWebViewChromeClient(FormsWebViewRenderer renderer)
         {
             Reference = new WeakReference<FormsWebViewRenderer>(renderer);
         }
+
     }
 }

Xam.Plugin.WebView.Droid/FormsWebViewClient.cs

@@ -40,24 +40,46 @@ public override void OnReceivedError(Android.Webkit.WebView view, IWebResourceRe
             renderer.Element.Navigating = false;
         }
 
-        public override bool ShouldOverrideUrlLoading(Android.Webkit.WebView view, IWebResourceRequest request)
+        public override WebResourceResponse ShouldInterceptRequest(Android.Webkit.WebView view, IWebResourceRequest request)
         {
-            if (Reference == null || !Reference.TryGetTarget(out FormsWebViewRenderer renderer)) return true;
-            if (renderer.Element == null) return true;
+            if (Reference == null || !Reference.TryGetTarget(out FormsWebViewRenderer renderer)) goto EndShouldInterceptRequest;
+            if (renderer.Element == null) goto EndShouldInterceptRequest;
 
             string url = request.Url.ToString();
             var response = renderer.Element.HandleNavigationStartRequest(url);
 
             if (response.Cancel || response.OffloadOntoDevice)
             {
-                if (response.OffloadOntoDevice)
-                    AttemptToHandleCustomUrlScheme(view, url);
+                Device.BeginInvokeOnMainThread(() =>
+                {
+                    if (response.OffloadOntoDevice)
+                        AttemptToHandleCustomUrlScheme(view, url);
 
-                view.StopLoading();
-                return true;
+                    view.StopLoading();
+                });
             }
 
-            return false;
+            EndShouldInterceptRequest:
+            return base.ShouldInterceptRequest(view, request);
+        }
+
+        void CheckResponseValidity(Android.Webkit.WebView view, string url)
+        {
+            if (Reference == null || !Reference.TryGetTarget(out FormsWebViewRenderer renderer)) return;
+            if (renderer.Element == null) return;
+
+            var response = renderer.Element.HandleNavigationStartRequest(url);
+
+            if (response.Cancel || response.OffloadOntoDevice)
+            {
+                Device.BeginInvokeOnMainThread(() =>
+                {
+                    if (response.OffloadOntoDevice)
+                        AttemptToHandleCustomUrlScheme(view, url);
+
+                    view.StopLoading();
+                });
+            }
         }
 
         public override void OnPageStarted(Android.Webkit.WebView view, string url, Bitmap favicon)