Upgrade to Pro
— share decks privately, control downloads, hide ads and more …
Speaker Deck
Features
Speaker Deck
PRO
Sign in
Sign up for free
Search
Search
WebViews in Flutter - Does it really work?
Search
Lara Martín
July 15, 2019
Programming
2
460
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
53
Accesibility on Flutter
laramartin
0
230
WebViews on Flutter
laramartin
1
350
Accessibility on Flutter
laramartin
2
730
Flutter for Web - Codemotion Berlin 2019
laramartin
2
63
Supporting Each Other - Growth for Juniors and Seniors
laramartin
1
340
Flutter for Web: Beautiful Apps and Websites with a Single Codebase
laramartin
1
270
Flutter Study Jam @ GDG Hannover
laramartin
1
290
Supporting Each Other - Growth for Juniors and Seniors
laramartin
0
310
Other Decks in Programming
See All in Programming
『改訂新版 良いコード/悪いコードで学ぶ設計入門』活用方法−爆速でスキルアップする!効果的な学習アプローチ / effective-learning-of-good-code
minodriven
28
4.1k
React 19でお手軽にCSS-in-JSを自作する
yukukotani
5
560
Findy Team+ Awardを受賞したかった!ベストプラクティス応募内容をふりかえり、開発生産性向上もふりかえる / Findy Team Plus Award BestPractice and DPE Retrospective 2024
honyanya
0
140
サーバーゆる勉強会 DBMS の仕組み編
kj455
1
300
ATDDで素早く安定した デリバリを実現しよう!
tonnsama
1
1.9k
DevFest - Serverless 101 with Google Cloud Functions
tunmise
0
140
Итераторы в Go 1.23: зачем они нужны, как использовать, и насколько они быстрые?
lamodatech
0
1.4k
20241217 競争力強化とビジネス価値創出への挑戦:モノタロウのシステムモダナイズ、開発組織の進化と今後の展望
monotaro
PRO
0
280
テストコードのガイドライン 〜作成から運用まで〜
riku929hr
7
1.4k
情報漏洩させないための設計
kubotak
5
1.3k
AppRouterを用いた大規模サービス開発におけるディレクトリ構成の変遷と問題点
eiganken
1
440
PHPカンファレンス 2024|共創を加速するための若手の技術挑戦
weddingpark
0
140
Featured
See All Featured
Docker and Python
trallard
43
3.2k
A Tale of Four Properties
chriscoyier
157
23k
Rebuilding a faster, lazier Slack
samanthasiow
79
8.8k
RailsConf & Balkan Ruby 2019: The Past, Present, and Future of Rails at GitHub
eileencodes
132
33k
Scaling GitHub
holman
459
140k
Building a Modern Day E-commerce SEO Strategy
aleyda
38
7k
Art, The Web, and Tiny UX
lynnandtonic
298
20k
Cheating the UX When There Is Nothing More to Optimize - PixelPioneers
stephaniewalter
280
13k
It's Worth the Effort
3n
183
28k
JavaScript: Past, Present, and Future - NDC Porto 2020
reverentgeek
47
5.1k
Learning to Love Humans: Emotional Interface Design
aarron
274
40k
How GitHub (no longer) Works
holman
312
140k
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!