webview_flutter_android 2.2.0 
webview_flutter_android: ^2.2.0 copied to clipboard
flutter.devA Flutter plugin that provides a WebView widget on Android.
// Copyright 2013 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// ignore_for_file: public_member_api_docs
import 'dart:async';
import 'dart:convert';
import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
import 'package:webview_flutter_android/webview_surface_android.dart';
import 'package:webview_flutter_platform_interface/webview_flutter_platform_interface.dart';
import 'web_view.dart';
void main() {
// Configure the [WebView] to use the [SurfaceAndroidWebView]
// implementation instead of the default [AndroidWebView].
WebView.platform = SurfaceAndroidWebView();
runApp(MaterialApp(home: _WebViewExample()));
}
const String kNavigationExamplePage = '''
<!DOCTYPE html><html>
<head><title>Navigation Delegate Example</title></head>
<body>
<p>
The navigation delegate is set to block navigation to the youtube website.
</p>
<ul>
<ul><a href="https://www.youtube.com/">https://www.youtube.com/</a></ul>
<ul><a href="https://www.google.com/">https://www.google.com/</a></ul>
</ul>
</body>
</html>
''';
class _WebViewExample extends StatefulWidget {
const _WebViewExample({Key? key}) : super(key: key);
@override
_WebViewExampleState createState() => _WebViewExampleState();
}
class _WebViewExampleState extends State<_WebViewExample> {
final Completer<WebViewController> _controller =
Completer<WebViewController>();
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: const Text('Flutter WebView example'),
// This drop down menu demonstrates that Flutter widgets can be shown over the web view.
actions: <Widget>[
_NavigationControls(_controller.future),
_SampleMenu(_controller.future),
],
),
// We're using a Builder here so we have a context that is below the Scaffold
// to allow calling Scaffold.of(context) so we can show a snackbar.
body: Builder(builder: (context) {
return WebView(
initialUrl: 'https://flutter.dev',
onWebViewCreated: (WebViewController controller) {
_controller.complete(controller);
},
javascriptChannels: _createJavascriptChannels(context),
javascriptMode: JavascriptMode.unrestricted,
userAgent: 'Custom_User_Agent',
);
}),
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())!;
// ignore: deprecated_member_use
Scaffold.of(context).showSnackBar(
SnackBar(content: Text('Favorited $url')),
);
},
child: const Icon(Icons.favorite),
);
}
return Container();
});
}
}
Set<JavascriptChannel> _createJavascriptChannels(BuildContext context) {
return {
JavascriptChannel(
name: 'Snackbar',
onMessageReceived: (JavascriptMessage message) {
ScaffoldMessenger.of(context)
.showSnackBar(SnackBar(content: Text(message.message)));
}),
};
}
enum _MenuOptions {
showUserAgent,
listCookies,
clearCookies,
addToCache,
listCache,
clearCache,
navigationDelegate,
}
class _SampleMenu extends StatelessWidget {
_SampleMenu(this.controller);
final Future<WebViewController> controller;
@override
Widget build(BuildContext context) {
return FutureBuilder<WebViewController>(
future: controller,
builder:
(BuildContext context, AsyncSnapshot<WebViewController> controller) {
return PopupMenuButton<_MenuOptions>(
onSelected: (_MenuOptions value) {
switch (value) {
case _MenuOptions.showUserAgent:
_onShowUserAgent(controller.data!, context);
break;
case _MenuOptions.listCookies:
_onListCookies(controller.data!, context);
break;
case _MenuOptions.clearCookies:
_onClearCookies(controller.data!, context);
break;
case _MenuOptions.addToCache:
_onAddToCache(controller.data!, context);
break;
case _MenuOptions.listCache:
_onListCache(controller.data!, context);
break;
case _MenuOptions.clearCache:
_onClearCache(controller.data!, context);
break;
case _MenuOptions.navigationDelegate:
_onNavigationDelegateExample(controller.data!, context);
break;
}
},
itemBuilder: (BuildContext context) => <PopupMenuItem<_MenuOptions>>[
PopupMenuItem<_MenuOptions>(
value: _MenuOptions.showUserAgent,
child: const Text('Show user agent'),
enabled: controller.hasData,
),
const PopupMenuItem<_MenuOptions>(
value: _MenuOptions.listCookies,
child: Text('List cookies'),
),
const PopupMenuItem<_MenuOptions>(
value: _MenuOptions.clearCookies,
child: Text('Clear cookies'),
),
const PopupMenuItem<_MenuOptions>(
value: _MenuOptions.addToCache,
child: Text('Add to cache'),
),
const PopupMenuItem<_MenuOptions>(
value: _MenuOptions.listCache,
child: Text('List cache'),
),
const PopupMenuItem<_MenuOptions>(
value: _MenuOptions.clearCache,
child: Text('Clear cache'),
),
const PopupMenuItem<_MenuOptions>(
value: _MenuOptions.navigationDelegate,
child: Text('Navigation Delegate example'),
),
],
);
},
);
}
void _onShowUserAgent(
WebViewController controller, BuildContext context) async {
// Send a message with the user agent string to the Snackbar JavaScript channel we registered
// with the WebView.
await controller.runJavascript(
'Snackbar.postMessage("User Agent: " + navigator.userAgent);');
}
void _onListCookies(
WebViewController controller, BuildContext context) async {
final String cookies =
await controller.runJavascriptReturningResult('document.cookie');
// ignore: deprecated_member_use
Scaffold.of(context).showSnackBar(SnackBar(
content: Column(
mainAxisAlignment: MainAxisAlignment.end,
mainAxisSize: MainAxisSize.min,
children: <Widget>[
const Text('Cookies:'),
_getCookieList(cookies),
],
),
));
}
void _onAddToCache(WebViewController controller, BuildContext context) async {
await controller.runJavascript(
'caches.open("test_caches_entry"); localStorage["test_localStorage"] = "dummy_entry";');
// ignore: deprecated_member_use
Scaffold.of(context).showSnackBar(const SnackBar(
content: Text('Added a test entry to cache.'),
));
}
void _onListCache(WebViewController controller, BuildContext context) async {
await controller.runJavascript('caches.keys()'
'.then((cacheKeys) => JSON.stringify({"cacheKeys" : cacheKeys, "localStorage" : localStorage}))'
'.then((caches) => Snackbar.postMessage(caches))');
}
void _onClearCache(WebViewController controller, BuildContext context) async {
await controller.clearCache();
// ignore: deprecated_member_use
Scaffold.of(context).showSnackBar(const SnackBar(
content: Text("Cache cleared."),
));
}
void _onClearCookies(
WebViewController controller, BuildContext context) async {
final bool hadCookies = await WebView.platform.clearCookies();
String message = 'There were cookies. Now, they are gone!';
if (!hadCookies) {
message = 'There are no cookies.';
}
// ignore: deprecated_member_use
Scaffold.of(context).showSnackBar(SnackBar(
content: Text(message),
));
}
void _onNavigationDelegateExample(
WebViewController controller, BuildContext context) async {
final String contentBase64 =
base64Encode(const Utf8Encoder().convert(kNavigationExamplePage));
await controller.loadUrl('data:text/html;base64,$contentBase64');
}
Widget _getCookieList(String cookies) {
if (cookies == null || cookies == '""') {
return Container();
}
final List<String> cookieList = cookies.split(';');
final Iterable<Text> cookieWidgets =
cookieList.map((String cookie) => Text(cookie));
return Column(
mainAxisAlignment: MainAxisAlignment.end,
mainAxisSize: MainAxisSize.min,
children: cookieWidgets.toList(),
);
}
}
class _NavigationControls extends StatelessWidget {
const _NavigationControls(this._webViewControllerFuture)
: assert(_webViewControllerFuture != null);
final Future<WebViewController> _webViewControllerFuture;
@override
Widget build(BuildContext context) {
return FutureBuilder<WebViewController>(
future: _webViewControllerFuture,
builder:
(BuildContext context, AsyncSnapshot<WebViewController> snapshot) {
final bool webViewReady =
snapshot.connectionState == ConnectionState.done;
final WebViewController? controller = snapshot.data;
return Row(
children: <Widget>[
IconButton(
icon: const Icon(Icons.arrow_back_ios),
onPressed: !webViewReady
? null
: () async {
if (await controller!.canGoBack()) {
await controller.goBack();
} else {
// ignore: deprecated_member_use
Scaffold.of(context).showSnackBar(
const SnackBar(content: Text("No back history item")),
);
return;
}
},
),
IconButton(
icon: const Icon(Icons.arrow_forward_ios),
onPressed: !webViewReady
? null
: () async {
if (await controller!.canGoForward()) {
await controller.goForward();
} else {
// ignore: deprecated_member_use
Scaffold.of(context).showSnackBar(
const SnackBar(
content: Text("No forward history item")),
);
return;
}
},
),
IconButton(
icon: const Icon(Icons.replay),
onPressed: !webViewReady
? null
: () {
controller!.reload();
},
),
],
);
},
);
}
}
/// Callback type for handling messages sent from JavaScript running in a web view.
typedef void JavascriptMessageHandler(JavascriptMessage message);Metadata
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Metadata
A Flutter plugin that provides a WebView widget on Android.
Repository (GitHub)
View/report issues
License
unknown (license)
Dependencies
flutter, webview_flutter_platform_interface
