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
250
WebViews on Flutter
laramartin
1
370
Accessibility on Flutter
laramartin
2
810
Flutter for Web - Codemotion Berlin 2019
laramartin
2
68
Supporting Each Other - Growth for Juniors and Seniors
laramartin
1
370
Flutter for Web: Beautiful Apps and Websites with a Single Codebase
laramartin
1
310
Flutter Study Jam @ GDG Hannover
laramartin
1
330
WebViews in Flutter - Does it really work?
laramartin
2
540
Other Decks in Programming
See All in Programming
あのころの iPod を どうにか再生させたい
orumin
2
2.5k
新世界の理解
koriym
0
140
State of CSS 2025
benjaminkott
1
110
学習を成果に繋げるための個人開発の考え方 〜 「学習のための個人開発」のすすめ / personal project for leaning
panda_program
1
100
マイコンでもRustのtestがしたい その2/KernelVM Tokyo 18
tnishinaga
2
2.3k
「リーダーは意思決定する人」って本当?~ 学びを現場で活かす、リーダー4ヶ月目の試行錯誤 ~
marina1017
0
230
書き捨てではなく継続開発可能なコードをAIコーディングエージェントで書くために意識していること
shuyakinjo
1
290
オープンセミナー2025@広島「君はどこで動かすか?」アンケート結果
satoshi256kbyte
0
150
DynamoDBは怖くない!〜テーブル設計の勘所とテスト戦略〜
hyamazaki
1
200
WebAssemblyインタプリタを書く ~Component Modelを添えて~
ruccho
1
870
STUNMESH-go: Wireguard NAT穿隧工具的源起與介紹
tjjh89017
0
380
Nuances on Kubernetes - RubyConf Taiwan 2025
envek
0
180
Featured
See All Featured
Building Flexible Design Systems
yeseniaperezcruz
328
39k
Visualizing Your Data: Incorporating Mongo into Loggly Infrastructure
mongodb
48
9.6k
Fantastic passwords and where to find them - at NoRuKo
philnash
51
3.4k
The Pragmatic Product Professional
lauravandoore
36
6.8k
Understanding Cognitive Biases in Performance Measurement
bluesmoon
29
1.8k
A better future with KSS
kneath
239
17k
Building a Modern Day E-commerce SEO Strategy
aleyda
43
7.4k
The Psychology of Web Performance [Beyond Tellerrand 2023]
tammyeverts
49
3k
"I'm Feeling Lucky" - Building Great Search Experiences for Today's Users (#IAC19)
danielanewman
229
22k
CSS Pre-Processors: Stylus, Less & Sass
bermonpainter
358
30k
Docker and Python
trallard
45
3.5k
Speed Design
sergeychernyshev
32
1.1k
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