Add currentUrl accessor to WebView plugin.

packages/webview_flutter/CHANGELOG.md

@@ -1,3 +1,8 @@
+## 0.1.1
+
+* Added a `currentUrl` accessor for the WebView controller to look up what URL
+  is being displayed.
+
 ## 0.1.0+1
 
 * Fix null crash when initialUrl is unset on iOS.

packages/webview_flutter/android/src/main/java/io/flutter/plugins/webviewflutter/FlutterWebView.java

@@ -53,6 +53,9 @@ public void onMethodCall(MethodCall methodCall, Result result) {
       case "goForward":
         goForward(methodCall, result);
         break;
+      case "currentUrl":
+        currentUrl(methodCall, result);
+        break;
       default:
         result.notImplemented();
     }
@@ -86,6 +89,10 @@ private void goForward(MethodCall methodCall, Result result) {
     result.success(null);
   }
 
+  private void currentUrl(MethodCall methodCall, Result result) {
+    result.success(webView.getUrl());
+  }
+
   @SuppressWarnings("unchecked")
   private void updateSettings(MethodCall methodCall, Result result) {
     applySettings((Map<String, Object>) methodCall.arguments);

packages/webview_flutter/example/ios/Flutter/Debug.xcconfig

@@ -1 +1,2 @@
+#include "Pods/Target Support Files/Pods-Runner/Pods-Runner.debug.xcconfig"
 #include "Generated.xcconfig"

packages/webview_flutter/example/ios/Flutter/Release.xcconfig

@@ -1 +1,2 @@
+#include "Pods/Target Support Files/Pods-Runner/Pods-Runner.release.xcconfig"
 #include "Generated.xcconfig"

packages/webview_flutter/example/lib/main.dart

@@ -30,8 +30,29 @@ class WebViewExample extends StatelessWidget {
           _controller.complete(webViewController);
         },
       ),
+      floatingActionButton: favoriteButton(),
     );
   }
+
+  Widget favoriteButton() {
+    return FutureBuilder<WebViewController>(
+        future: _controller.future,
+        builder: (BuildContext context,
+            AsyncSnapshot<WebViewController> controller) {
+          if (controller.hasData) {
+            return FloatingActionButton(
+              onPressed: () async {
+                final String url = await controller.data.currentUrl();
+                Scaffold.of(context).showSnackBar(
+                  SnackBar(content: Text("Favorited $url")),
+                );
+              },
+              child: const Icon(Icons.favorite),
+            );
+          }
+          return Container();
+        });
+  }
 }
 
 class SampleMenu extends StatelessWidget {

packages/webview_flutter/ios/Classes/FlutterWebView.m

@@ -32,6 +32,7 @@ @implementation FLTWebViewController {
   WKWebView* _webView;
   int64_t _viewId;
   FlutterMethodChannel* _channel;
+  NSString* _currentUrl;
 }
 
 - (instancetype)initWithFrame:(CGRect)frame
@@ -74,6 +75,8 @@ - (void)onMethodCall:(FlutterMethodCall*)call result:(FlutterResult)result {
     [self onGoBack:call result:result];
   } else if ([[call method] isEqualToString:@"goForward"]) {
     [self onGoForward:call result:result];
+  } else if ([[call method] isEqualToString:@"currentUrl"]) {
+    [self onCurrentUrl:call result:result];
   } else {
     result(FlutterMethodNotImplemented);
   }
@@ -115,6 +118,11 @@ - (void)onGoForward:(FlutterMethodCall*)call result:(FlutterResult)result {
   result(nil);
 }
 
+- (void)onCurrentUrl:(FlutterMethodCall*)call result:(FlutterResult)result {
+  _currentUrl = [[_webView URL] absoluteString];
+  result(_currentUrl);
+}
+
 - (void)applySettings:(NSDictionary<NSString*, id>*)settings {
   for (NSString* key in settings) {
     if ([key isEqualToString:@"jsMode"]) {

packages/webview_flutter/lib/webview_flutter.dart

@@ -205,6 +205,18 @@ class WebViewController {
     return _channel.invokeMethod('loadUrl', url);
   }
 
+  /// Accessor to the current URL that the WebView is displaying.
+  ///
+  /// If [WebView.initialUrl] was never specified, or if , currentUrl returns `null`.
+  /// Note that this operation is asynchronous, and it is possible that the
+  /// current URL changes again by the time this function returns (in other
+  /// words, by the time this future completes, the WebView may be displaying a
+  /// different URL).
+  Future<String> currentUrl() async {
+    final String url = await _channel.invokeMethod('currentUrl');
+    return url;
+  }
+
   /// Checks whether there's a back history item.
   ///
   /// Note that this operation is asynchronous, and it is possible that the "canGoBack" state has

packages/webview_flutter/pubspec.yaml

@@ -1,6 +1,6 @@
 name: webview_flutter
 description: A Flutter plugin that provides a WebView widget on Android and iOS.
-version: 0.1.0+1
+version: 0.1.1
 author: Flutter Team <flutter-dev@googlegroups.com>
 homepage: https://github.com/flutter/plugins/tree/master/packages/webview_flutter
 

packages/webview_flutter/test/webview_flutter_test.dart

@@ -27,14 +27,17 @@ void main() {
   });
 
   testWidgets('Initial url', (WidgetTester tester) async {
-    await tester.pumpWidget(const WebView(
-      initialUrl: 'https://youtube.com',
-    ));
-
-    final FakePlatformWebView platformWebView =
-        fakePlatformViewsController.lastCreatedView;
+    WebViewController controller;
+    await tester.pumpWidget(
+      WebView(
+        initialUrl: 'https://youtube.com',
+        onWebViewCreated: (WebViewController webViewController) {
+          controller = webViewController;
+        },
+      ),
+    );
 
-    expect(platformWebView.currentUrl, 'https://youtube.com');
+    expect(await controller.currentUrl(), 'https://youtube.com');
   });
 
   testWidgets('JavaScript mode', (WidgetTester tester) async {
@@ -68,15 +71,12 @@ void main() {
 
     expect(controller, isNotNull);
 
-    final FakePlatformWebView platformWebView =
-        fakePlatformViewsController.lastCreatedView;
-
     controller.loadUrl('https://flutter.io');
 
-    expect(platformWebView.currentUrl, 'https://flutter.io');
+    expect(await controller.currentUrl(), 'https://flutter.io');
   });
 
-  testWidgets('Invald urls', (WidgetTester tester) async {
+  testWidgets('Invalid urls', (WidgetTester tester) async {
     WebViewController controller;
     await tester.pumpWidget(
       WebView(
@@ -88,18 +88,15 @@ void main() {
 
     expect(controller, isNotNull);
 
-    final FakePlatformWebView platformWebView =
-        fakePlatformViewsController.lastCreatedView;
-
     expect(() => controller.loadUrl(null), throwsA(anything));
-    expect(platformWebView.currentUrl, isNull);
+    expect(await controller.currentUrl(), isNull);
 
     expect(() => controller.loadUrl(''), throwsA(anything));
-    expect(platformWebView.currentUrl, isNull);
+    expect(await controller.currentUrl(), isNull);
 
     // Missing schema.
     expect(() => controller.loadUrl('flutter.io'), throwsA(anything));
-    expect(platformWebView.currentUrl, isNull);
+    expect(await controller.currentUrl(), isNull);
   });
 
   testWidgets("Can't go back before loading a page",
@@ -224,18 +221,15 @@ void main() {
 
     expect(controller, isNotNull);
 
-    final FakePlatformWebView platformWebView =
-        fakePlatformViewsController.lastCreatedView;
-
-    expect(platformWebView.currentUrl, 'https://youtube.com');
+    expect(await controller.currentUrl(), 'https://youtube.com');
 
     controller.loadUrl('https://flutter.io');
 
-    expect(platformWebView.currentUrl, 'https://flutter.io');
+    expect(await controller.currentUrl(), 'https://flutter.io');
 
     controller.goBack();
 
-    expect(platformWebView.currentUrl, 'https://youtube.com');
+    expect(await controller.currentUrl(), 'https://youtube.com');
   });
 
   testWidgets('Go forward', (WidgetTester tester) async {
@@ -251,22 +245,44 @@ void main() {
 
     expect(controller, isNotNull);
 
-    final FakePlatformWebView platformWebView =
-        fakePlatformViewsController.lastCreatedView;
-
-    expect(platformWebView.currentUrl, 'https://youtube.com');
+    expect(await controller.currentUrl(), 'https://youtube.com');
 
     controller.loadUrl('https://flutter.io');
 
-    expect(platformWebView.currentUrl, 'https://flutter.io');
+    expect(await controller.currentUrl(), 'https://flutter.io');
 
     controller.goBack();
 
-    expect(platformWebView.currentUrl, 'https://youtube.com');
+    expect(await controller.currentUrl(), 'https://youtube.com');
 
     controller.goForward();
 
-    expect(platformWebView.currentUrl, 'https://flutter.io');
+    expect(await controller.currentUrl(), 'https://flutter.io');
+  });
+
+  testWidgets('Current URL', (WidgetTester tester) async {
+    WebViewController controller;
+    await tester.pumpWidget(
+      WebView(
+        onWebViewCreated: (WebViewController webViewController) {
+          controller = webViewController;
+        },
+      ),
+    );
+
+    expect(controller, isNotNull);
+
+    // Test a WebView without an explicitly set first URL.
+    expect(await controller.currentUrl(), isNull);
+
+    controller.loadUrl('https://youtube.com');
+    expect(await controller.currentUrl(), 'https://youtube.com');
+
+    controller.loadUrl('https://flutter.io');
+    expect(await controller.currentUrl(), 'https://flutter.io');
+
+    controller.goBack();
+    expect(await controller.currentUrl(), 'https://youtube.com');
   });
 }
 
@@ -321,6 +337,9 @@ class FakePlatformWebView {
         currentPosition = min(history.length - 1, currentPosition + 1);
         return Future<void>.sync(() {});
         break;
+      case 'currentUrl':
+        return Future<String>.value(currentUrl);
+        break;
     }
     return Future<void>.sync(() {});
   }