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
810
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
330
WebViews in Flutter - Does it really work?
laramartin
2
550
Other Decks in Programming
See All in Programming
意外と簡単!?フロントエンドでパスキー認証を実現する WebAuthn
teamlab
PRO
2
770
はじめてのMaterial3 Expressive
ym223
2
890
楽して成果を出すためのセルフリソース管理
clipnote
0
190
AIと私たちの学習の変化を考える - Claude Codeの学習モードを例に
azukiazusa1
11
4.4k
OSS開発者という働き方
andpad
5
1.7k
Improving my own Ruby thereafter
sisshiki1969
1
160
さようなら Date。 ようこそTemporal! 3年間先行利用して得られた知見の共有
8beeeaaat
3
1.5k
AI Coding Agentのセキュリティリスク:PRの自己承認とメルカリの対策
s3h
0
230
テストコードはもう書かない:JetBrains AI Assistantに委ねる非同期処理のテスト自動設計・生成
makun
0
520
The Past, Present, and Future of Enterprise Java with ASF in the Middle
ivargrimstad
0
160
Compose Multiplatform × AI で作る、次世代アプリ開発支援ツールの設計と実装
thagikura
0
170
Android 16 × Jetpack Composeで縦書きテキストエディタを作ろう / Vertical Text Editor with Compose on Android 16
cc4966
2
260
Featured
See All Featured
ピンチをチャンスに:未来をつくるプロダクトロードマップ #pmconf2020
aki_iinuma
127
53k
Measuring & Analyzing Core Web Vitals
bluesmoon
9
580
"I'm Feeling Lucky" - Building Great Search Experiences for Today's Users (#IAC19)
danielanewman
229
22k
The Art of Delivering Value - GDevCon NA Keynote
reverentgeek
15
1.7k
Exploring the Power of Turbo Streams & Action Cable | RailsConf2023
kevinliebholz
34
6k
Building Flexible Design Systems
yeseniaperezcruz
329
39k
Optimising Largest Contentful Paint
csswizardry
37
3.4k
Automating Front-end Workflow
addyosmani
1370
200k
A Tale of Four Properties
chriscoyier
160
23k
Easily Structure & Communicate Ideas using Wireframe
afnizarnur
194
16k
Raft: Consensus for Rubyists
vanstee
140
7.1k
Save Time (by Creating Custom Rails Generators)
garrettdimon
PRO
32
1.6k
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