Upgrade to Pro
— share decks privately, control downloads, hide ads and more …
Speaker Deck
Speaker Deck
PRO
Sign in
Sign up for free
WebViews in Flutter - Does it really work?
Lara Martín
July 15, 2019
Programming
2
200
WebViews in Flutter - Does it really work?
Talk given at Flutter London meetup
https://www.meetup.com/FlutterLDN/events/262574231/
Lara Martín
July 15, 2019
Tweet
Share
More Decks by Lara Martín
See All by Lara Martín
Supporting Each Other: Growth for Juniors and Seniors
laramartin
1
39
Accesibility on Flutter
laramartin
0
140
WebViews on Flutter
laramartin
1
220
Accessibility on Flutter
laramartin
2
350
Flutter for Web - Codemotion Berlin 2019
laramartin
2
53
Supporting Each Other - Growth for Juniors and Seniors
laramartin
1
170
Flutter for Web: Beautiful Apps and Websites with a Single Codebase
laramartin
1
92
Flutter Study Jam @ GDG Hannover
laramartin
1
120
Supporting Each Other - Growth for Juniors and Seniors
laramartin
0
150
Other Decks in Programming
See All in Programming
Untangling Coroutine Testing (Android Makers 2022)
zsmb
0
380
LOWYAの信頼性向上とNew Relic
kazumax55
4
290
You CANt teach an old dog new tricks
michaelbukachi
0
110
Go で始める将棋 AI
mururu
1
120
既存のプロジェクトにKMMを導入するための対応策
martysuzuki
2
280
Node.js 最新動向 TFCon 2022
yosuke_furukawa
PRO
5
2.3k
よりUXに近いSLI・SLOの運用による可用性の再設計
kazumanagano
2
370
あなたの会社の古いシステム、なんとかしませんか?~システム刷新から考えるDX化への道筋とバリエーション~/webinar20220420-systems
grapecity_dev
0
110
Develop your CI tools
xgouchet
2
180
Groovy Roadmap
paulk
7
13k
あなたの会社の古いシステム、なんとかしませんか?~システム刷新から考えるDX化への道筋とバリエーション~/webinar20220420-grapecity
grapecity_dev
0
120
About Type Syntax Proposal
quramy
1
690
Featured
See All Featured
Music & Morning Musume
bryan
35
4.1k
Fashionably flexible responsive web design (full day workshop)
malarkey
396
62k
How to train your dragon (web standard)
notwaldorf
57
3.8k
The MySQL Ecosystem @ GitHub 2015
samlambert
238
11k
Mobile First: as difficult as doing things right
swwweet
212
7.5k
Code Reviewing Like a Champion
maltzj
506
37k
How GitHub Uses GitHub to Build GitHub
holman
465
280k
Large-scale JavaScript Application Architecture
addyosmani
499
110k
Three Pipe Problems
jasonvnalue
89
8.6k
Web development in the modern age
philhawksworth
197
9.3k
VelocityConf: Rendering Performance Case Studies
addyosmani
316
22k
10 Git Anti Patterns You Should be Aware of
lemiorhan
638
52k
Transcript
WebViews in Flutter Does it really work? Lara Martín @Lariki
Flutter/Dart GDE - Android Developer
What is a WebView?
Why we need WebViews? Use cases Perform social login Show
static content (e.g. FAQ) Payment confirmation Avoid for Making an app that is just a web
https://pub.dev/packages/webview_flutter
Setup # pubspec.yaml dependencies: flutter: sdk: flutter webview_flutter: ^0.3.10
Implementation • Not reimplemented in Dart! • Uses native WebView
iOS: WKWebView Android: android.webkit.WebView • But is it a Widget? The plugin creates the native WebView And renders it in Flutter!
Rendering the Android WebView
Working Example
Flutter Inspector
Flutter Inspector
Flutter Inspector
WebView Rendering on Android AndroidView _AndroidPlatformView RenderAndroidView : RenderBox WebView
renders contains … in requires WebViewFactory surface ID contains child PlatformViewController FlutterWebView : PlatformView creates WebViewFlutterPlugin registers Surface WebView contains
Rendering the iOS WKWebView
WebView Rendering on iOS • Similar to Android • RenderUiKitView
will render a surface created in the PlatformViewIOS • Passes an ID
WebView Widget
WebView Widget • InitialUrl • javaScriptMode • onWebViewCreated • onPageFinished
• gestureRecognizers • navigationDelegate • javaScriptChannels
WebView Widget • InitialUrl • javaScriptMode • onWebViewCreated • onPageFinished
• gestureRecognizers • navigationDelegate • javaScriptChannels
WebView Widget: initialUrl WebView(),
WebView Widget: initialUrl WebView( initialUrl: “https://www.flutter.dev/", ),
WebView Widget • InitialUrl • javaScriptMode • onWebViewCreated • onPageFinished
• gestureRecognizers • navigationDelegate • javaScriptChannels
WebView Widget: javaScriptMode WebView( initialUrl: … javascriptMode: JavascriptMode.unrestricted, ),
WebView Widget • InitialUrl • javaScriptMode • onWebViewCreated • onPageFinished
• gestureRecognizers • navigationDelegate • javaScriptChannels
WebView Widget: onWebViewCreated WebView( initialUrl: … javascriptMode: … onWebViewCreated: (WebViewController
controller) { _controller = controller; }, ),
WebViewController • loadUrl(String url) • currentUrl() • canGoBack() • canGoForward()
• goBack() • goForward() • reload() • clearCache()
WebViewController • loadUrl(String url) • currentUrl() • canGoBack() • canGoForward()
• goBack() • goForward() • reload() • clearCache()
WebViewController: reload onPressed: () async { await _controller.reload(); }
WebView Widget • InitialUrl • javaScriptMode • onWebViewCreated • onPageFinished
• gestureRecognizers • navigationDelegate • javaScriptChannels
WebView Widget: onPageFinished WebView( initialUrl: … javascriptMode: … onWebViewCreated: …
onPageFinished: (url) { // use the URL } ),
WebView Widget • InitialUrl • javaScriptMode • onWebViewCreated • onPageFinished
• gestureRecognizers • navigationDelegate • javaScriptChannels
WebView Widget • InitialUrl • javaScriptMode • onWebViewCreated • onPageFinished
• gestureRecognizers • navigationDelegate • javaScriptChannels The Power of WebViews in Flutter, by Emily Fortuna https:/ /medium.com/flutter-io/the-power-of-webviews-in-flutter- a56234b57df2
WebView Widget • InitialUrl • javaScriptMode • onWebViewCreated • onPageFinished
• gestureRecognizers • navigationDelegate • javaScriptChannels
WebView Widget: NavigationDelegate typedef NavigationDecision NavigationDelegate(NavigationRequest n);
WebView Widget: NavigationDelegate WebView( navigationDelegate: (request) { bool isHost =
request.url.startsWith( “https://flutter.dev”); if (isHost) return NavigationDecision.navigate; else return NavigationDecision.prevent; } );
WebView Widget • InitialUrl • javaScriptMode • onWebViewCreated • onPageFinished
• gestureRecognizers • navigationDelegate • javaScriptChannels
WebView Widget: javaScriptChannels WebView( javascriptChannels: {_channel}, );
WebView Widget: javaScriptChannels WebView( javascriptChannels: {_channel}, ); var _channel =
JavascriptChannel( name: 'LaraDemo', onMessageReceived: (JavascriptMessage message) { print(message.message); });
WebView Widget: javaScriptChannels WebView( javascriptChannels: {_channel}, ); var _channel =
JavascriptChannel( name: 'LaraDemo', onMessageReceived: (JavascriptMessage message) { print(message.message); });
WebView Widget: javaScriptChannels WebView( javascriptChannels: {_channel}, ); var _channel =
JavascriptChannel( name: 'LaraDemo', onMessageReceived: (JavascriptMessage message) { print(message.message); });
WebView Widget: javaScriptChannels WebView( javascriptChannels: {_channel}, ); var _channel =
JavascriptChannel( name: 'LaraDemo', onMessageReceived: (JavascriptMessage message) { print(message.message); });
WebView Widget: javaScriptChannels var _channel = JavascriptChannel( name: 'LaraDemo', onMessageReceived:
(JavascriptMessage message) { print(message.message); }); Flutter side <script> LaraDemo.postMessage('Hello'); </script> HTML side
Limitations
Input Fields https:/ /github.com/flutter/flutter/issues/19718 FIXED!-ish
Text Selection https:/ /github.com/flutter/flutter/issues/24584
Performance AndroidView is costly
What’s next
Setting a custom UserAgent https:/ /github.com/flutter/plugins/pull/968
Page loaded correctly https:/ /github.com/flutter/plugins/pull/1389
Loading an HTML string https:/ /github.com/flutter/plugins/pull/1312
Community Plugin
WebView community plugin https:/ /pub.dev/packages/flutter_webview_plugin
WebView community plugin MaterialApp( home: WebviewScaffold( url: url, appBar: AppBar(
title: Text("community webview"), ), ), );
WebView community plugin https:/ /pub.dev/packages/flutter_webview_plugin deprecated?
Contributing
Contributing
Contributing
Flutter is open-source. Submit a pull request!
57 L a r a M a r t í
n F l u t t e r / D a r t G D E A n d r o i d D e v e l o p e r @ L a r i k i Thank You!