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
May 14, 2019
Programming
0
340
WebViews in Flutter - Does it really work?
Talk given at Flutter Berlin meetup
https://www.meetup.com/flutter-berlin/events/261016228/
Lara Martín
May 14, 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
830
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
550
Other Decks in Programming
See All in Programming
大規模アプリのDIフレームワーク刷新戦略 ~過去最大規模の並行開発を止めずにアプリ全体に導入するまで~
mot_techtalk
0
390
クラシルを支える技術と組織
rakutek
0
190
Go言語の特性を活かした公式MCP SDKの設計
hond0413
1
190
Swift Concurrency - 状態監視の罠
objectiveaudio
2
470
育てるアーキテクチャ:戦い抜くPythonマイクロサービスの設計と進化戦略
fujidomoe
1
150
Playwrightはどのようにクロスブラウザをサポートしているのか
yotahada3
7
2.3k
CSC509 Lecture 01
javiergs
PRO
1
430
Goで実践するドメイン駆動開発 AIと歩み始めた新規プロダクト開発の現在地
imkaoru
4
680
タスクの特性や不確実性に応じた最適な作業スタイルの選択(ペアプロ・モブプロ・ソロプロ)と実践 / Optimal Work Style Selection: Pair, Mob, or Solo Programming.
honyanya
3
140
After go func(): Goroutines Through a Beginner’s Eye
97vaibhav
0
240
CSC305 Lecture 01
javiergs
PRO
1
400
『毎日の移動』を支えるGoバックエンド内製開発
yutautsugi
2
200
Featured
See All Featured
Six Lessons from altMBA
skipperchong
28
4k
No one is an island. Learnings from fostering a developers community.
thoeni
21
3.5k
Why You Should Never Use an ORM
jnunemaker
PRO
59
9.6k
"I'm Feeling Lucky" - Building Great Search Experiences for Today's Users (#IAC19)
danielanewman
229
22k
Facilitating Awesome Meetings
lara
56
6.6k
4 Signs Your Business is Dying
shpigford
185
22k
How To Stay Up To Date on Web Technology
chriscoyier
791
250k
[RailsConf 2023] Rails as a piece of cake
palkan
57
5.9k
Practical Tips for Bootstrapping Information Extraction Pipelines
honnibal
PRO
23
1.5k
Connecting the Dots Between Site Speed, User Experience & Your Business [WebExpo 2025]
tammyeverts
9
580
Building Flexible Design Systems
yeseniaperezcruz
329
39k
The Language of Interfaces
destraynor
162
25k
Transcript
WebViews in Flutter Lara Martín @lariki Does it really work?
What is a WebView?
Why we need WebViews? Perform social login Show static content
(e.g. FAQ ) Payment confirmation Use cases Making an app that is just a web Avoid for
https:/ /pub.dev/packages/webview_flutter
Setup # pubspec.yaml dependencies: flutter: sdk: flutter webview_flutter: ^0.3.6
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
WebView WebView Rendering on Android
AndroidView WebView child WebView Rendering on Android
WebView Rendering on Android AndroidView WebView WebViewFlutterPlugin child requires …
WebViewFactory registers
AndroidView WebView FlutterWebView : PlatformView WebView contains creates child …
WebView Rendering on Android WebViewFlutterPlugin requires WebViewFactory registers
AndroidView WebView FlutterWebView : PlatformView WebView PlatformViewController contains creates renders
Surface child … in WebView Rendering on Android WebViewFlutterPlugin requires WebViewFactory registers
AndroidView _AndroidPlatformView RenderAndroidView : RenderBox WebView FlutterWebView : PlatformView WebView
PlatformViewController contains creates renders Surface contains contains child … in WebView Rendering on Android WebViewFlutterPlugin requires WebViewFactory registers
AndroidView _AndroidPlatformView RenderAndroidView : RenderBox WebView FlutterWebView : PlatformView WebView
PlatformViewController contains creates renders Surface contains contains child … in WebView Rendering on Android WebViewFlutterPlugin requires WebViewFactory registers Surface ID
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 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
NavigationDelegate typedef NavigationDecision NavigationDelegate(NavigationRequest n);
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
javaScriptChannels WebView( javascriptChannels: {_channel}, ),
javaScriptChannels var _channel = JavascriptChannel( name: 'LaraDemo', onMessageReceived: (JavascriptMessage message)
{ print(message.message); }); WebView( javascriptChannels: {_channel}, ),
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
Contributing
Contributing
Flutter is open-source. Submit a pull request!
Thanks. @lariki Lara Martín