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
370
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
55
Accesibility on Flutter
laramartin
0
230
WebViews on Flutter
laramartin
1
350
Accessibility on Flutter
laramartin
2
740
Flutter for Web - Codemotion Berlin 2019
laramartin
2
63
Supporting Each Other - Growth for Juniors and Seniors
laramartin
1
350
Flutter for Web: Beautiful Apps and Websites with a Single Codebase
laramartin
1
280
Flutter Study Jam @ GDG Hannover
laramartin
1
300
WebViews in Flutter - Does it really work?
laramartin
2
470
Other Decks in Programming
See All in Programming
チームリードになって変わったこと
isaka1022
0
190
Grafana Loki によるサーバログのコスト削減
mot_techtalk
1
120
密集、ドキュメントのコロケーション with AWS Lambda
satoshi256kbyte
0
190
Amazon ECS とマイクロサービスから考えるシステム構成
hiyanger
2
520
2024年のkintone API振り返りと2025年 / kintone API look back in 2024
tasshi
0
220
Immutable ActiveRecord
megane42
0
140
Amazon Q Developer Proで効率化するAPI開発入門
seike460
PRO
0
110
技術を根付かせる / How to make technology take root
kubode
1
240
DROBEの生成AI活用事例 with AWS
ippey
0
130
Rails アプリ地図考 Flush Cut
makicamel
1
110
Pythonでもちょっとリッチな見た目のアプリを設計してみる
ueponx
1
530
時計仕掛けのCompose
mkeeda
1
290
Featured
See All Featured
ReactJS: Keep Simple. Everything can be a component!
pedronauck
666
120k
[RailsConf 2023] Rails as a piece of cake
palkan
53
5.2k
Build The Right Thing And Hit Your Dates
maggiecrowley
34
2.5k
JavaScript: Past, Present, and Future - NDC Porto 2020
reverentgeek
47
5.2k
Rails Girls Zürich Keynote
gr2m
94
13k
GraphQLの誤解/rethinking-graphql
sonatard
68
10k
4 Signs Your Business is Dying
shpigford
182
22k
Why You Should Never Use an ORM
jnunemaker
PRO
55
9.2k
Principles of Awesome APIs and How to Build Them.
keavy
126
17k
Faster Mobile Websites
deanohume
306
31k
Speed Design
sergeychernyshev
26
790
Responsive Adventures: Dirty Tricks From The Dark Corners of Front-End
smashingmag
251
21k
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!