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
June 26, 2019
Programming
1
400
WebViews in Flutter - Does it really work?
Talk given at Flutter Wrocław meetup
https://www.meetup.com/Flutter-Wroc%C5%82aw/events/261982616/
Lara Martín
June 26, 2019
Tweet
Share
More Decks by Lara Martín
See All by Lara Martín
Supporting Each Other: Growth for Juniors and Seniors
laramartin
1
57
Accesibility on Flutter
laramartin
0
260
WebViews on Flutter
laramartin
1
370
Accessibility on Flutter
laramartin
2
870
Flutter for Web - Codemotion Berlin 2019
laramartin
2
68
Supporting Each Other - Growth for Juniors and Seniors
laramartin
1
380
Flutter for Web: Beautiful Apps and Websites with a Single Codebase
laramartin
1
310
Flutter Study Jam @ GDG Hannover
laramartin
1
340
WebViews in Flutter - Does it really work?
laramartin
2
560
Other Decks in Programming
See All in Programming
monorepo の Go テストをはやくした〜い!~最小の依存解決への道のり~ / faster-testing-of-monorepos
convto
2
540
bootcamp2025_バックエンド研修_WebAPIサーバ作成.pdf
geniee_inc
0
130
チームの境界をブチ抜いていけ
tokai235
0
220
3年ぶりにコードを書いた元CTOが Claude Codeと30分でMVPを作った話
maikokojima
0
630
SODA - FACT BOOK(JP)
sodainc
1
8.7k
技術的負債の正体を知って向き合う
irof
0
250
実践Claude Code:20の失敗から学ぶAIペアプログラミング
takedatakashi
18
8.5k
Devoxx BE - Local Development in the AI Era
kdubois
0
140
バッチ処理を「状態の記録」から「事実の記録」へ
panda728
PRO
0
190
The Past, Present, and Future of Enterprise Java
ivargrimstad
0
460
When Dependencies Fail: Building Antifragile Applications in a Fragile World
selcukusta
0
110
NixOS + Kubernetesで構築する自宅サーバーのすべて
ichi_h3
0
1.2k
Featured
See All Featured
Making Projects Easy
brettharned
120
6.4k
Fashionably flexible responsive web design (full day workshop)
malarkey
407
66k
Building a Modern Day E-commerce SEO Strategy
aleyda
44
7.8k
Faster Mobile Websites
deanohume
310
31k
Exploring the Power of Turbo Streams & Action Cable | RailsConf2023
kevinliebholz
36
6.1k
[RailsConf 2023] Rails as a piece of cake
palkan
57
5.9k
Build your cross-platform service in a week with App Engine
jlugia
233
18k
Designing Experiences People Love
moore
142
24k
実際に使うSQLの書き方 徹底解説 / pgcon21j-tutorial
soudai
PRO
190
55k
Designing for Performance
lara
610
69k
YesSQL, Process and Tooling at Scale
rocio
173
15k
Keith and Marios Guide to Fast Websites
keithpitt
411
23k
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: ^0.3.9+1
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!
Working Example
Rendering the Android WebView
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 typedef NavigationDecision NavigationDelegate(NavigationRequest n);
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 var _channel = JavascriptChannel( name: 'LaraDemo', onMessageReceived:
(JavascriptMessage message) { print(message.message); }); Flutter side
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
Text Selection https:/ /github.com/flutter/flutter/issues/24584
Performance AndroidView is costly
What’s next
Loading an HTML string https:/ /github.com/flutter/plugins/pull/1312
Setting a custom UserAgent https:/ /github.com/flutter/plugins/pull/968
Page loaded correctly https:/ /github.com/flutter/plugins/pull/1389
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"), ), ), );
Contributing
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!