[webview_flutter] Added the ability to activate the zoom (Android)

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

@@ -174,6 +174,9 @@ private void applySettings(Map<String, Object> settings) {
         case "jsMode":
           updateJsMode((Integer) settings.get(key));
           break;
+        case "zoom":
+          updateZoomMode((boolean) settings.get(key));
+          break;
         default:
           throw new IllegalArgumentException("Unknown WebView setting: " + key);
       }
@@ -193,6 +196,14 @@ private void updateJsMode(int mode) {
     }
   }
 
+  private void updateZoomMode(boolean mode) {
+    //webView.getSettings().setLoadWithOverviewMode(true);
+    webView.getSettings().setUseWideViewPort(mode);
+    webView.getSettings().setBuiltInZoomControls(mode);
+    // Pop-up zoom controls disabled. This is a temporary stop because dialog is not responding to touch events.
+    webView.getSettings().setDisplayZoomControls(false);
+  }
+
   private void registerJavaScriptChannelNames(List<String> channelNames) {
     for (String channelName : channelNames) {
       webView.addJavascriptInterface(

packages/webview_flutter/example/lib/main.dart

@@ -28,6 +28,7 @@ class WebViewExample extends StatelessWidget {
       body: Builder(builder: (BuildContext context) {
         return WebView(
           initialUrl: 'https://flutter.io',
+          zoom: true,
           javascriptMode: JavascriptMode.unrestricted,
           onWebViewCreated: (WebViewController webViewController) {
             _controller.complete(webViewController);

packages/webview_flutter/lib/webview_flutter.dart

@@ -79,6 +79,7 @@ class WebView extends StatefulWidget {
     this.javascriptMode = JavascriptMode.disabled,
     this.javascriptChannels,
     this.gestureRecognizers,
+    this.zoom = false,
   })  : assert(javascriptMode != null),
         super(key: key);
 
@@ -130,7 +131,10 @@ class WebView extends StatefulWidget {
   ///
   /// A null value is equivalent to an empty set.
   final Set<JavascriptChannel> javascriptChannels;
-
+
+  /// Enable/Disable zoom.
+  final bool zoom;
+
   @override
   State<StatefulWidget> createState() => _WebViewState();
 }
@@ -256,19 +260,19 @@ class _CreationParams {
 }
 
 class _WebSettings {
-  _WebSettings({
-    this.javascriptMode,
-  });
-
+  _WebSettings({this.javascriptMode, this.zoom});
   static _WebSettings fromWidget(WebView widget) {
-    return _WebSettings(javascriptMode: widget.javascriptMode);
+    return _WebSettings(
+        javascriptMode: widget.javascriptMode, zoom: widget.zoom);
   }
 
   final JavascriptMode javascriptMode;
-
+  final bool zoom;
+
   Map<String, dynamic> toMap() {
     return <String, dynamic>{
       'jsMode': javascriptMode.index,
+      'zoom': zoom,
     };
   }
 
@@ -278,6 +282,7 @@ class _WebSettings {
     }
     return <String, dynamic>{
       'jsMode': newSettings.javascriptMode.index,
+      'zoom': newSettings.zoom,
     };
   }
 }