flutter_webview_plugin_enhance 0.0.1

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  • Changelog
  • Example
  • Installing
  • 74

Flutter Community

Flutter WebView Plugin #

pub package

Plugin that allows Flutter to communicate with a native WebView.

Warning: The webview is not integrated in the widget tree, it is a native view on top of the flutter view. you won't be able to use snackbars, dialogs ...

Getting Started #

For help getting started with Flutter, view our online documentation.

How it works #

Launch WebView Fullscreen with Flutter navigation

new MaterialApp(
      routes: {
        "/": (_) => new WebviewScaffold(
          url: "https://www.google.com",
          appBar: new AppBar(
            title: new Text("Widget webview"),
          ),
        ),
      },
    );

Optional parameters hidden and initialChild are available so that you can show something else while waiting for the page to load. If you set hidden to true it will show a default CircularProgressIndicator. If you additionally specify a Widget for initialChild you can have it display whatever you like till page-load.

e.g. The following will show a read screen with the text 'waiting.....'.

return new MaterialApp(
  title: 'Flutter WebView Demo',
  theme: new ThemeData(
    primarySwatch: Colors.blue,
  ),
  routes: {
    '/': (_) => const MyHomePage(title: 'Flutter WebView Demo'),
    '/widget': (_) => new WebviewScaffold(
      url: selectedUrl,
      appBar: new AppBar(
        title: const Text('Widget webview'),
      ),
      withZoom: true,
      withLocalStorage: true,
      hidden: true,
      initialChild: Container(
        color: Colors.redAccent,
        child: const Center(
          child: Text('Waiting.....'),
        ),
      ),
    ),
  },
);

FlutterWebviewPlugin provide a singleton instance linked to one unique webview, so you can take control of the webview from anywhere in the app

listen for events

final flutterWebviewPlugin = new FlutterWebviewPlugin();

flutterWebviewPlugin.onUrlChanged.listen((String url) {

});

Listen for scroll event in webview

final flutterWebviewPlugin = new FlutterWebviewPlugin();
flutterWebviewPlugin.onScrollYChanged.listen((double offsetY) { // latest offset value in vertical scroll
  // compare vertical scroll changes here with old value
});

flutterWebviewPlugin.onScrollXChanged.listen((double offsetX) { // latest offset value in horizontal scroll
  // compare horizontal scroll changes here with old value
});

Note: Do note there is a slight difference is scroll distance between ios and android. Android scroll value difference tends to be larger than ios devices.

Hidden WebView

final flutterWebviewPlugin = new FlutterWebviewPlugin();

flutterWebviewPlugin.launch(url, hidden: true);

Close launched WebView

flutterWebviewPlugin.close();

Webview inside custom Rectangle

final flutterWebviewPlugin = new FlutterWebviewPlugin();

flutterWebviewPlugin.launch(url,
  fullScreen: false,
  rect: new Rect.fromLTWH(
    0.0,
    0.0,
    MediaQuery.of(context).size.width,
    300.0,
  ),
);

Webview Events #

  • Stream<Null> onDestroy
  • Stream<String> onUrlChanged
  • Stream<WebViewStateChanged> onStateChanged
  • Stream<double> onScrollXChanged
  • Stream<double> onScrollYChanged
  • Stream<String> onError

Don't forget to dispose webview flutterWebviewPlugin.dispose()

Webview Functions #

Future<Null> launch(String url, {
   Map<String, String> headers: null,
   bool withJavascript: true,
   bool clearCache: false,
   bool clearCookies: false,
   bool hidden: false,
   bool enableAppScheme: true,
   Rect rect: null,
   String userAgent: null,
   bool withZoom: false,
   bool withLocalStorage: true,
   bool withLocalUrl: true,
   bool scrollBar: true,
   bool supportMultipleWindows: false,
   bool appCacheEnabled: false,
   bool allowFileURLs: false,
});
Future<String> evalJavascript(String code);
Future<Map<String, dynamic>> getCookies();
Future<Null> cleanCookies();
Future<Null> resize(Rect rect);
Future<Null> show();
Future<Null> hide();
Future<Null> reloadUrl(String url);
Future<Null> close();
Future<Null> reload();
Future<Null> goBack();
Future<Null> goForward();
Future<Null> stopLoading();

0.3.0 #

  • Fixes rect capture issue. Ensures WebView remains in the correct place on screen even when keyboard appears.
  • Fixed iOS crash issue with Flutter >= 0.10.2.
  • Added new clearCookies feature.
  • Added support for hidden and initialChild feature to show page loading view.
  • Added supportMultipleWindows: enables Multiple Window Support on Android.
  • Added appCacheEnabled: enables Application Caches API on Android.
  • Added allowFileURLs: allows file:// local file URLs.
  • iOS Now supports: reload, goBack, and goForward.
  • iOS Bug fix didFailNavigation #77
  • Updated Android compileSdkVersion to 27 matching offical Flutter plugins.
  • Fixed Android reloadUrl so settings are not cleared.
  • Enabled compatible Mixed Content Mode on Android.

0.2.1 #

  • Added webview scrolling listener
  • Added stopLoading() method

0.2.0 #

  • update sdk
  • prevent negative webview height in scaffold
  • handle type error in getCookies
  • Support file upload via WebView on Android
  • fix WebviewScaffold crash on iOS
  • Scrollbar functionality to Web view
  • Add support of HTTP errors
  • Add headers when loading url

0.1.6 #

  • fix onStateChanged
  • Taking safe areas into account for bottom bars
  • iOS
    • withLocalUrl option for iOS > 9.0
  • Android
    • add reload, goBack and foForward function

0.1.5 #

  • iOS use WKWebView instead of UIWebView

0.1.4 #

  • support localstorage for ANDROID

0.1.3 #

  • support zoom in webview

0.1.2 #

  • support bottomNavigationBar and persistentFooterButtons on webview scaffold

0.1.1 #

  • support back button navigation for Android
    • if cannot go back, it will trigger onDestroy
  • support preview dart2

0.1.0+1 #

  • fix Android close webview

0.1.0 #

  • iOS && Android:

    • get cookies
    • eval javascript
    • user agent setting
    • state change event
    • embed in rectangle or fullscreen if null
    • hidden webview
  • Android

    • adding Activity in manifest is not needed anymore
  • Add WebviewScaffold

0.0.9 #

  • Android: remove the need to use FlutterActivity as base activity

0.0.5 #

  • fix "onDestroy" event for iOS #4
  • fix fullscreen mode for iOS #5

0.0.4 #

  • IOS implementation
  • Update to last version of Flutter

0.0.3 #

  • Documentation

0.0.2 #

  • Initial version for Android

example/lib/main.dart

import 'dart:async';

import 'package:flutter/material.dart';

import 'package:flutter_webview_plugin_enhance/flutter_webview_plugin_enhance.dart';

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';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  final flutterWebViewPlugin = FlutterWebviewPlugin();

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter WebView Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      routes: {
        '/': (_) => const MyHomePage(title: 'Flutter WebView Demo'),
        '/widget': (_) {
          return WebviewScaffold(
            url: selectedUrl,
            appBar: AppBar(
              title: const Text('Widget WebView'),
            ),
            withZoom: true,
            withLocalStorage: true,
            hidden: true,
            initialChild: Container(
              color: Colors.redAccent,
              child: const Center(
                child: Text('Waiting.....'),
              ),
            ),
            bottomNavigationBar: BottomAppBar(
              child: Row(
                children: <Widget>[
                  IconButton(
                    icon: const Icon(Icons.arrow_back_ios),
                    onPressed: () {
                      flutterWebViewPlugin.goBack();
                    },
                  ),
                  IconButton(
                    icon: const Icon(Icons.arrow_forward_ios),
                    onPressed: () {
                      flutterWebViewPlugin.goForward();
                    },
                  ),
                  IconButton(
                    icon: const Icon(Icons.autorenew),
                    onPressed: () {
                      flutterWebViewPlugin.reload();
                    },
                  ),
                ],
              ),
            ),
          );
        },
      },
    );
  }
}

class MyHomePage extends StatefulWidget {
  const MyHomePage({Key key, this.title}) : super(key: key);

  final String title;

  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  // Instance of WebView plugin
  final flutterWebViewPlugin = FlutterWebviewPlugin();

  // On destroy stream
  StreamSubscription _onDestroy;

  // On urlChanged stream
  StreamSubscription<String> _onUrlChanged;

  // On urlChanged stream
  StreamSubscription<WebViewStateChanged> _onStateChanged;

  StreamSubscription<WebViewHttpError> _onHttpError;

  StreamSubscription<double> _onScrollYChanged;

  StreamSubscription<double> _onScrollXChanged;

  final _urlCtrl = TextEditingController(text: selectedUrl);

  final _codeCtrl = TextEditingController(text: 'window.navigator.userAgent');

  final _scaffoldKey = GlobalKey<ScaffoldState>();

  final _history = [];

  @override
  void initState() {
    super.initState();

    flutterWebViewPlugin.close();

    _urlCtrl.addListener(() {
      selectedUrl = _urlCtrl.text;
    });

    // Add a listener to on destroy WebView, so you can make came actions.
    _onDestroy = flutterWebViewPlugin.onDestroy.listen((_) {
      if (mounted) {
        // Actions like show a info toast.
        _scaffoldKey.currentState.showSnackBar(const SnackBar(content: const Text('Webview Destroyed')));
      }
    });

    // Add a listener to on url changed
    _onUrlChanged = flutterWebViewPlugin.onUrlChanged.listen((String url) {
      if (mounted) {
        setState(() {
          _history.add('onUrlChanged: $url');
        });
      }
    });

    _onScrollYChanged = flutterWebViewPlugin.onScrollYChanged.listen((double y) {
      if (mounted) {
        setState(() {
          _history.add('Scroll in Y Direction: $y');
        });
      }
    });

    _onScrollXChanged = flutterWebViewPlugin.onScrollXChanged.listen((double x) {
      if (mounted) {
        setState(() {
          _history.add('Scroll in X Direction: $x');
        });
      }
    });

    _onStateChanged = flutterWebViewPlugin.onStateChanged.listen((WebViewStateChanged state) {
      if (mounted) {
        setState(() {
          _history.add('onStateChanged: ${state.type} ${state.url}');
        });
      }
    });

    _onHttpError = flutterWebViewPlugin.onHttpError.listen((WebViewHttpError error) {
      if (mounted) {
        setState(() {
          _history.add('onHttpError: ${error.code} ${error.url}');
        });
      }
    });
  }

  @override
  void dispose() {
    // Every listener should be canceled, the same should be done with this stream.
    _onDestroy.cancel();
    _onUrlChanged.cancel();
    _onStateChanged.cancel();
    _onHttpError.cancel();
    _onScrollXChanged.cancel();
    _onScrollYChanged.cancel();

    flutterWebViewPlugin.dispose();

    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      key: _scaffoldKey,
      appBar: AppBar(
        title: const Text('Plugin example app'),
      ),
      body: SingleChildScrollView(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            Container(
              padding: const EdgeInsets.all(24.0),
              child: TextField(controller: _urlCtrl),
            ),
            RaisedButton(
              onPressed: () {
                flutterWebViewPlugin.launch(
                  selectedUrl,
                  rect: Rect.fromLTWH(0.0, 0.0, MediaQuery.of(context).size.width, 300.0),
                  userAgent: kAndroidUserAgent,
                );
              },
              child: const Text('Open Webview (rect)'),
            ),
            RaisedButton(
              onPressed: () {
                flutterWebViewPlugin.launch(selectedUrl, hidden: true);
              },
              child: const Text('Open "hidden" Webview'),
            ),
            RaisedButton(
              onPressed: () {
                flutterWebViewPlugin.launch(selectedUrl);
              },
              child: const Text('Open Fullscreen Webview'),
            ),
            RaisedButton(
              onPressed: () {
                Navigator.of(context).pushNamed('/widget');
              },
              child: const Text('Open widget webview'),
            ),
            Container(
              padding: const EdgeInsets.all(24.0),
              child: TextField(controller: _codeCtrl),
            ),
            RaisedButton(
              onPressed: () {
                final future = flutterWebViewPlugin.evalJavascript(_codeCtrl.text);
                future.then((String result) {
                  setState(() {
                    _history.add('eval: $result');
                  });
                });
              },
              child: const Text('Eval some javascript'),
            ),
            RaisedButton(
              onPressed: () {
                setState(() {
                  _history.clear();
                });
                flutterWebViewPlugin.close();
              },
              child: const Text('Close'),
            ),
            RaisedButton(
              onPressed: () {
                flutterWebViewPlugin.getCookies().then((m) {
                  setState(() {
                    _history.add('cookies: $m');
                  });
                });
              },
              child: const Text('Cookies'),
            ),
            Text(_history.join('\n'))
          ],
        ),
      ),
    );
  }
}

Use this package as a library

1. Depend on it

Add this to your package's pubspec.yaml file:


dependencies:
  flutter_webview_plugin_enhance: ^0.0.1

2. Install it

You can install packages from the command line:

with Flutter:


$ flutter pub get

Alternatively, your editor might support flutter pub get. Check the docs for your editor to learn more.

3. Import it

Now in your Dart code, you can use:


import 'package:flutter_webview_plugin_enhance/flutter_webview_plugin_enhance.dart';
  
Popularity:
Describes how popular the package is relative to other packages. [more]
53
Health:
Code health derived from static analysis. [more]
100
Maintenance:
Reflects how tidy and up-to-date the package is. [more]
87
Overall:
Weighted score of the above. [more]
74
Learn more about scoring.

We analyzed this package on Apr 8, 2020, and provided a score, details, and suggestions below. Analysis was completed with status completed using:

  • Dart: 2.7.1
  • pana: 0.13.6
  • Flutter: 1.12.13+hotfix.8

Health suggestions

Format lib/src/base.dart.

Run flutter format to format lib/src/base.dart.

Format lib/src/webview_scaffold.dart.

Run flutter format to format lib/src/webview_scaffold.dart.

Maintenance suggestions

Package is pre-v0.1 release. (-10 points)

While nothing is inherently wrong with versions of 0.0.*, it might mean that the author is still experimenting with the general direction of the API.

The description is too long. (-3 points)

Search engines display only the first part of the description. Try to keep the value of the description field in your package's pubspec.yaml file between 60 and 180 characters.

Dependencies

Package Constraint Resolved Available
Direct dependencies
Dart SDK >=2.0.0 <3.0.0
flutter 0.0.0
Transitive dependencies
collection 1.14.11 1.14.12
meta 1.1.8
sky_engine 0.0.99
typed_data 1.1.6
vector_math 2.0.8