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
350
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
870
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
560
Other Decks in Programming
See All in Programming
AIと人間の共創開発!OSSで試行錯誤した開発スタイル
mae616
2
810
Claude CodeによるAI駆動開発の実践 〜そこから見えてきたこれからのプログラミング〜
iriikeita
0
340
実践Claude Code:20の失敗から学ぶAIペアプログラミング
takedatakashi
18
8.8k
コードとあなたと私の距離 / The Distance Between Code, You, and I
hiro_y
0
190
AI 駆動開発におけるコミュニティと AWS CDK の価値
konokenj
5
260
Introduce Hono CLI
yusukebe
6
3.1k
AkarengaLT vol.38
hashimoto_kei
1
120
技術的負債の正体を知って向き合う
irof
0
260
Google Opalで使える37のライブラリ
mickey_kubo
3
150
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
900
Migration to Signals, Resource API, and NgRx Signal Store
manfredsteyer
PRO
0
120
社会人になっても趣味開発を続けたい! / traPavilion
mazrean
1
100
Featured
See All Featured
A designer walks into a library…
pauljervisheath
209
24k
Imperfection Machines: The Place of Print at Facebook
scottboms
269
13k
Code Review Best Practice
trishagee
72
19k
Making the Leap to Tech Lead
cromwellryan
135
9.6k
Easily Structure & Communicate Ideas using Wireframe
afnizarnur
194
16k
Cheating the UX When There Is Nothing More to Optimize - PixelPioneers
stephaniewalter
285
14k
Performance Is Good for Brains [We Love Speed 2024]
tammyeverts
12
1.2k
A better future with KSS
kneath
239
18k
Automating Front-end Workflow
addyosmani
1371
200k
個人開発の失敗を避けるイケてる考え方 / tips for indie hackers
panda_program
116
20k
Visualization
eitanlees
149
16k
Raft: Consensus for Rubyists
vanstee
140
7.2k
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