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
310
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
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
Software Architecture
hschwentner
6
2.1k
Compose でデザインと実装の差異を減らすための取り組み
oidy
1
300
Immutable ActiveRecord
megane42
0
130
Honoとフロントエンドの 型安全性について
yodaka
4
250
CNCF Project の作者が考えている OSS の運営
utam0k
5
690
Kubernetes History Inspector(KHI)を触ってみた
bells17
0
200
AWS Organizations で実現する、 マルチ AWS アカウントのルートユーザー管理からの脱却
atpons
0
130
Honoのおもしろいミドルウェアをみてみよう
yusukebe
1
200
2024年のWebフロントエンドのふりかえりと2025年
sakito
1
230
時計仕掛けのCompose
mkeeda
1
280
個人アプリを2年ぶりにアプデしたから褒めて / I just updated my personal app, praise me!
lovee
0
340
Writing documentation can be fun with plugin system
okuramasafumi
0
120
Featured
See All Featured
How to train your dragon (web standard)
notwaldorf
90
5.8k
"I'm Feeling Lucky" - Building Great Search Experiences for Today's Users (#IAC19)
danielanewman
226
22k
Adopting Sorbet at Scale
ufuk
74
9.2k
Helping Users Find Their Own Way: Creating Modern Search Experiences
danielanewman
29
2.4k
Gamification - CAS2011
davidbonilla
80
5.1k
Designing for humans not robots
tammielis
250
25k
Intergalactic Javascript Robots from Outer Space
tanoku
270
27k
Visualizing Your Data: Incorporating Mongo into Loggly Infrastructure
mongodb
44
9.4k
Become a Pro
speakerdeck
PRO
26
5.1k
Code Review Best Practice
trishagee
66
17k
The Straight Up "How To Draw Better" Workshop
denniskardys
232
140k
The Psychology of Web Performance [Beyond Tellerrand 2023]
tammyeverts
45
2.3k
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