Add support for sending data from webview to native in iOS and Android

fluttercommunity · Jun 26, 2019 · 0fa539c · 0fa539c
1 parent 90f1e5a
commit 0fa539c
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Showing 7 changed files with 100 additions and 9 deletions.
diff --git a/android/src/main/java/com/flutter_webview_plugin/WebviewManager.java b/android/src/main/java/com/flutter_webview_plugin/WebviewManager.java
@@ -10,6 +10,7 @@
 import android.view.View;
 import android.view.ViewGroup;
 import android.webkit.CookieManager;
+import android.webkit.JavascriptInterface;
 import android.webkit.GeolocationPermissions;
 import android.webkit.ValueCallback;
 import android.webkit.WebChromeClient;
@@ -244,6 +245,8 @@ public void onProgressChanged(WebView view, int progress) {
                 FlutterWebviewPlugin.channel.invokeMethod("onProgressChanged", args);
             }
         });
+
+        webView.addJavascriptInterface(new WebAppInterface(), "Android");
     }
 
     private Uri getOutputFilename(String intentType) {
@@ -495,4 +498,13 @@ void stopLoading(MethodCall call, MethodChannel.Result result){
             webView.stopLoading();
         }
     }
+
+    public class WebAppInterface {
+        @JavascriptInterface
+        public void postMessage(String value){
+            Map<String, String> postMessageMap = new HashMap<>();
+            postMessageMap.put("postMessage", value);
+            FlutterWebviewPlugin.channel.invokeMethod("onPostMessage", postMessageMap);
+        }
+    }
 }
diff --git a/example/html/index.html b/example/html/index.html
@@ -0,0 +1,30 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <meta http-equiv="X-UA-Compatible" content="ie=edge">
+    <title>Document</title>
+</head>
+<body>
+    <button id="button" style="background-color:#158461;height:30px;">send to flutter</button>
+
+    <script>
+        function sendData(data) {
+            if (/(iPhone|iPad|iPod|iOS)/i.test(navigator.userAgent)){
+                window.webkit.messageHandlers.Native.postMessage(data);
+            }else{
+                if (window.Android && window.Android.postMessage) {
+                    Android.postMessage(data);
+                }
+            }
+        }
+
+        window.onload = function () {
+            document.getElementById('button').onclick = function () {
+                sendData(JSON.stringify({ action: 'log', data: '1234' }));
+            }
+        }
+    </script>
+</body>
+</html>
diff --git a/example/ios/Runner.xcodeproj/project.pbxproj b/example/ios/Runner.xcodeproj/project.pbxproj
@@ -7,7 +7,6 @@
 	objects = {
 
 /* Begin PBXBuildFile section */
-		2D5378261FAA1A9400D5DBA9 /* flutter_assets in Resources */ = {isa = PBXBuildFile; fileRef = 2D5378251FAA1A9400D5DBA9 /* flutter_assets */; };
 		3B3967161E833CAA004F5970 /* AppFrameworkInfo.plist in Resources */ = {isa = PBXBuildFile; fileRef = 3B3967151E833CAA004F5970 /* AppFrameworkInfo.plist */; };
 		3B80C3941E831B6300D905FE /* App.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = 3B80C3931E831B6300D905FE /* App.framework */; };
 		3B80C3951E831B6300D905FE /* App.framework in Embed Frameworks */ = {isa = PBXBuildFile; fileRef = 3B80C3931E831B6300D905FE /* App.framework */; settings = {ATTRIBUTES = (CodeSignOnCopy, RemoveHeadersOnCopy, ); }; };
@@ -40,7 +39,8 @@
 /* End PBXCopyFilesBuildPhase section */
 
 /* Begin PBXFileReference section */
-		2D5378251FAA1A9400D5DBA9 /* flutter_assets */ = {isa = PBXFileReference; lastKnownFileType = folder; name = flutter_assets; path = Flutter/flutter_assets; sourceTree = SOURCE_ROOT; };
+		0FF8E441CB3BD619650FCC75 /* Pods-Runner.release.xcconfig */ = {isa = PBXFileReference; includeInIndex = 1; lastKnownFileType = text.xcconfig; name = "Pods-Runner.release.xcconfig"; path = "Pods/Target Support Files/Pods-Runner/Pods-Runner.release.xcconfig"; sourceTree = "<group>"; };
+		2BCC7A531667984C22F241E2 /* Pods-Runner.debug.xcconfig */ = {isa = PBXFileReference; includeInIndex = 1; lastKnownFileType = text.xcconfig; name = "Pods-Runner.debug.xcconfig"; path = "Pods/Target Support Files/Pods-Runner/Pods-Runner.debug.xcconfig"; sourceTree = "<group>"; };
 		3B3967151E833CAA004F5970 /* AppFrameworkInfo.plist */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = text.plist.xml; name = AppFrameworkInfo.plist; path = Flutter/AppFrameworkInfo.plist; sourceTree = "<group>"; };
 		3B80C3931E831B6300D905FE /* App.framework */ = {isa = PBXFileReference; lastKnownFileType = wrapper.framework; name = App.framework; path = Flutter/App.framework; sourceTree = "<group>"; };
 		7AFA3C8E1D35360C0083082E /* Release.xcconfig */ = {isa = PBXFileReference; lastKnownFileType = text.xcconfig; name = Release.xcconfig; path = Flutter/Release.xcconfig; sourceTree = "<group>"; };
@@ -77,6 +77,8 @@
 		840012C8B5EDBCF56B0E4AC1 /* Pods */ = {
 			isa = PBXGroup;
 			children = (
+				2BCC7A531667984C22F241E2 /* Pods-Runner.debug.xcconfig */,
+				0FF8E441CB3BD619650FCC75 /* Pods-Runner.release.xcconfig */,
 			);
 			name = Pods;
 			sourceTree = "<group>";
@@ -86,7 +88,6 @@
 			children = (
 				3B80C3931E831B6300D905FE /* App.framework */,
 				3B3967151E833CAA004F5970 /* AppFrameworkInfo.plist */,
-				2D5378251FAA1A9400D5DBA9 /* flutter_assets */,
 				9740EEBA1CF902C7004384FC /* Flutter.framework */,
 				9740EEB21CF90195004384FC /* Debug.xcconfig */,
 				7AFA3C8E1D35360C0083082E /* Release.xcconfig */,
@@ -211,7 +212,6 @@
 				97C147011CF9000F007C117D /* LaunchScreen.storyboard in Resources */,
 				9740EEB51CF90195004384FC /* Generated.xcconfig in Resources */,
 				3B3967161E833CAA004F5970 /* AppFrameworkInfo.plist in Resources */,
-				2D5378261FAA1A9400D5DBA9 /* flutter_assets in Resources */,
 				9740EEB41CF90195004384FC /* Debug.xcconfig in Resources */,
 				97C146FE1CF9000F007C117D /* Assets.xcassets in Resources */,
 				97C146FC1CF9000F007C117D /* Main.storyboard in Resources */,
@@ -241,8 +241,8 @@
 			files = (
 			);
 			inputPaths = (
-				"${SRCROOT}/Pods/Target Support Files/Pods-Runner/Pods-Runner-frameworks.sh",
-				"${PODS_ROOT}/../../../../../flutter/bin/cache/artifacts/engine/ios/Flutter.framework",
+				"${PODS_ROOT}/Target Support Files/Pods-Runner/Pods-Runner-frameworks.sh",
+				"${PODS_ROOT}/../../../../../../Documents/flutter/bin/cache/artifacts/engine/ios/Flutter.framework",
 				"${BUILT_PRODUCTS_DIR}/flutter_webview_plugin/flutter_webview_plugin.framework",
 			);
 			name = "[CP] Embed Pods Frameworks";
@@ -252,7 +252,7 @@
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 			shellPath = /bin/sh;
-			shellScript = "\"${SRCROOT}/Pods/Target Support Files/Pods-Runner/Pods-Runner-frameworks.sh\"\n";
+			shellScript = "\"${PODS_ROOT}/Target Support Files/Pods-Runner/Pods-Runner-frameworks.sh\"\n";
 			showEnvVarsInLog = 0;
 		};
 		9740EEB61CF901F6004384FC /* Run Script */ = {

diff --git a/example/ios/Runner.xcworkspace/xcshareddata/WorkspaceSettings.xcsettings b/example/ios/Runner.xcworkspace/xcshareddata/WorkspaceSettings.xcsettings
@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>BuildSystemType</key>
+	<string>Original</string>
+</dict>
+</plist>
diff --git a/example/lib/main.dart b/example/lib/main.dart
@@ -8,6 +8,7 @@ const kAndroidUserAgent =
     'Mozilla/5.0 (Linux; Android 6.0; Nexus 5 Build/MRA58N) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/62.0.3202.94 Mobile Safari/537.36';
 
 String selectedUrl = 'https://flutter.io';
+String messageUrl = 'your_server/index.html';
 
 void main() => runApp(MyApp());
 
@@ -99,6 +100,8 @@ class _MyHomePageState extends State<MyHomePage> {
 
   StreamSubscription<double> _onScrollXChanged;
 
+  StreamSubscription<String> _onMessage;
+
   final _urlCtrl = TextEditingController(text: selectedUrl);
 
   final _codeCtrl = TextEditingController(text: 'window.navigator.userAgent');
@@ -173,6 +176,14 @@ class _MyHomePageState extends State<MyHomePage> {
         });
       }
     });
+
+    _onMessage = flutterWebViewPlugin.onPostMessage.listen((msg) {
+      if (mounted) {
+        setState(() {
+          _history.add('message: $msg');
+        });
+      }
+    });
   }
 
   @override
@@ -185,6 +196,7 @@ class _MyHomePageState extends State<MyHomePage> {
     _onProgressChanged.cancel();
     _onScrollXChanged.cancel();
     _onScrollYChanged.cancel();
+    _onMessage.cancel();
 
     flutterWebViewPlugin.dispose();
 
@@ -211,12 +223,23 @@ class _MyHomePageState extends State<MyHomePage> {
                 flutterWebViewPlugin.launch(
                   selectedUrl,
                   rect: Rect.fromLTWH(0.0, 0.0, MediaQuery.of(context).size.width, 300.0),
-                  userAgent: kAndroidUserAgent,
+                  // userAgent: kAndroidUserAgent,
                   invalidUrlRegex: r'^(https).+(twitter)', // prevent redirecting to twitter when user click on its icon in flutter website
                 );
               },
               child: const Text('Open Webview (rect)'),
             ),
+            RaisedButton(
+              onPressed: () {
+                flutterWebViewPlugin.launch(
+                  messageUrl,
+                  rect: Rect.fromLTWH(0.0, 0.0, MediaQuery.of(context).size.width, 300.0),
+                  // userAgent: kAndroidUserAgent,
+                  invalidUrlRegex: r'^(https).+(twitter)', // prevent redirecting to twitter when user click on its icon in flutter website
+                );
+              },
+              child: const Text('Open Webview (message demo)'),
+            ),
             RaisedButton(
               onPressed: () {
                 flutterWebViewPlugin.launch(selectedUrl, hidden: true);

diff --git a/ios/Classes/FlutterWebviewPlugin.m b/ios/Classes/FlutterWebviewPlugin.m
@@ -107,7 +107,12 @@ - (void)initWebview:(FlutterMethodCall*)call {
         rc = self.viewController.view.bounds;
     }
 
-    self.webview = [[WKWebView alloc] initWithFrame:rc];
+    WKWebViewConfiguration *config = [[WKWebViewConfiguration alloc] init];
+    config.userContentController = [[WKUserContentController alloc] init];
+
+    [config.userContentController addScriptMessageHandler:self name:@"Native"];
+
+    self.webview = [[WKWebView alloc] initWithFrame:rc configuration:config];
     self.webview.UIDelegate = self;
     self.webview.navigationDelegate = self;
     self.webview.scrollView.delegate = self;
@@ -338,6 +343,11 @@ - (void)webView:(WKWebView *)webView decidePolicyForNavigationResponse:(WKNaviga
     decisionHandler(WKNavigationResponsePolicyAllow);
 }
 
+#pragma mark - WKScriptMessageHandler
+- (void)userContentController:(WKUserContentController *)userContentController didReceiveScriptMessage:(WKScriptMessage *)message {
+    [channel invokeMethod:@"onPostMessage" arguments: @{@"postMessage": message.body}];
+}
+
 #pragma mark -- UIScrollViewDelegate
 - (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView {
     if (scrollView.pinchGestureRecognizer.isEnabled != _enableZoom) {

diff --git a/lib/src/base.dart b/lib/src/base.dart
@@ -1,4 +1,5 @@
 import 'dart:async';
+import 'dart:convert';
 import 'dart:ui';
 
 import 'package:flutter/material.dart';
@@ -31,6 +32,7 @@ class FlutterWebviewPlugin {
   final _onScrollYChanged = StreamController<double>.broadcast();
   final _onProgressChanged = new StreamController<double>.broadcast();
   final _onHttpError = StreamController<WebViewHttpError>.broadcast();
+  final _onPostMessage = StreamController<String>.broadcast();
 
   Future<Null> _handleMessages(MethodCall call) async {
     switch (call.method) {
@@ -62,6 +64,9 @@ class FlutterWebviewPlugin {
       case 'onHttpError':
         _onHttpError.add(WebViewHttpError(call.arguments['code'], call.arguments['url']));
         break;
+      case 'onPostMessage':
+        _onPostMessage.add(call.arguments['postMessage']);
+        break;
     }
   }
 
@@ -90,6 +95,8 @@ class FlutterWebviewPlugin {
 
   Stream<WebViewHttpError> get onHttpError => _onHttpError.stream;
 
+  Stream<String> get onPostMessage => _onPostMessage.stream;
+
   /// Start the Webview with [url]
   /// - [headers] specify additional HTTP headers
   /// - [withJavascript] enable Javascript or not for the Webview
@@ -212,6 +219,7 @@ class FlutterWebviewPlugin {
     _onScrollXChanged.close();
     _onScrollYChanged.close();
     _onHttpError.close();
+    _onPostMessage.close();
     _instance = null;
   }