platformViewRegistry.registerViewFactory func is missing in import dart.ui

[zengfr]

Upgrading-from-package:flutter_web-to-the-Flutter-SDK in flutter>=1.9
import 'package:flutter_web_ui/ui.dart' as ui change to import 'dart.ui '
ui.platformViewRegistry.registerViewFactory func is missing.

import 'package:flutter_web_ui/ui.dart' as ui;
 ui.platformViewRegistry.registerViewFactory(
        'maphtml',
            (int viewId) => IFrameElement()
          ..allowFullscreen=true
          ..height = '360'
          ..src = 'https://github.com/zengfr?'+_params
          ..style.border = 'none');

https://github.com/flutter/flutter/wiki/Upgrading-from-package:flutter_web-to-the-Flutter-SDK
Update the pubspec.yaml
Change:
dependencies:
flutter_web: any
flutter_web_ui: any
to:
dependencies:
flutter:
sdk: flutter

[GaspardMerten]

The problem is just that the analyser version of Flutter does not yet support dart:ui or dart:js! So you should be able to build your app and it will work as expected because the version of Flutter that is used to build/run has dart:ui!

[escamoteur]

For Flutter Web I recommend to use the master channel.
Could you please add the output of flutter doctor - v here

[zengfr]

For Flutter Web I recommend to use the master channel.
Could you please add the output of flutter doctor - v here

E:\javaproject\flutterwebdemo\examples\myweb>flutter doctor - v
Doctor summary (to see all details, run flutter doctor -v):
[√] Flutter (Channel master, v1.10.7-pre.70, on Microsoft Windows [Version 10.0.10240], locale zh-CN)
[√] Android toolchain - develop for Android devices (Android SDK version 29.0.2)
[√] Chrome - develop for the web
[√] Android Studio (version 3.5)
[√] IntelliJ IDEA Ultimate Edition (version 2019.1)
[√] Connected device (2 available)

• No issues found!

E:\javaproject\flutterwebdemo\examples\myweb>

[escamoteur]

Do you still have the problem?

[zengfr]

is use D:\flutter>flutter upgrade Still have problems

error: The name 'platformViewRegistry' is being referenced through the prefix 'ui', but it isn't defined in any of the libraries imported using that prefix. (undefined_prefixed_name at [myweb] lib\agent\map.dart:12)

import 'dart:html';
import 'package:flutter/material.dart';
import 'dart:ui' as ui;

class MapPage extends StatefulWidget {
final String _params;

MapPage({String params}) : _params = params;

@OverRide
State createState() {
ui.platformViewRegistry.registerViewFactory(
'maphtml',
(int viewId) => IFrameElement()

Flutter 1.10.7-pre.73 • channel master • https://github.com/flutter/flutter.git
Framework • revision 67b5bdf (16 hours ago) • 2019-09-28 14:24:46 -0700
Engine • revision 5b952f2
Tools • Dart 2.6.0 (build 2.6.0-dev.3.0 6ff8d2199d)

Running flutter doctor...
Doctor summary (to see all details, run flutter doctor -v):
[√] Flutter (Channel master, v1.10.7-pre.73, on Microsoft Windows [Version 10.0.10240], locale zh-CN)
[√] Android toolchain - develop for Android devices (Android SDK version 29.0.2)
[√] Chrome - develop for the web
[√] Android Studio (version 3.5)
[√] IntelliJ IDEA Ultimate Edition (version 2019.1)
[√] Connected device (2 available)

• No issues found!

D:\flutter>

[Abhilash-Chandran]

Same issue in my case.

[√] Flutter (Channel master, v1.10.7-pre.79, on Microsoft Windows [Version 10.0.17134.950], locale de-DE)
• Flutter version 1.10.7-pre.79 at C:\Abhilash\Installs\flutter
• Framework revision 7e73cd7 (77 minutes ago), 2019-09-30 14:45:30 +0100
• Engine revision 5b952f2
• Dart version 2.6.0 (build 2.6.0-dev.3.0 6ff8d2199d)

[√] Android toolchain - develop for Android devices (Android SDK version 28.0.3)
• Android SDK at C:\Users\xyz\AppData\Local\Android\sdk
• Android NDK location not configured (optional; useful for native profiling support)
• Platform android-28, build-tools 28.0.3
• Java binary at: C:\Users\xyz\AppData\Local\JetBrains\Toolbox\apps\AndroidStudio\ch-0\191.5791312\jre\bin\java
• Java version OpenJDK Runtime Environment (build 1.8.0_202-release-1483-b03)
• All Android licenses accepted.

[√] Chrome - develop for the web
• Chrome at C:\Users\xyz\AppData\Local\Google\Chrome\Application\chrome.exe

[√] Android Studio (version 3.4)
• Android Studio at C:\Users\xyz\AppData\Local\JetBrains\Toolbox\apps\AndroidStudio\ch-0\183.5692245
• Flutter plugin version 38.2.1
• Dart plugin version 183.6270
• Java version OpenJDK Runtime Environment (build 1.8.0_152-release-1343-b01)

[√] Android Studio (version 3.5)
• Android Studio at C:\Users\xyz\AppData\Local\JetBrains\Toolbox\apps\AndroidStudio\ch-0\191.5791312
• Flutter plugin version 39.0.3
• Dart plugin version 191.8423
• Java version OpenJDK Runtime Environment (build 1.8.0_202-release-1483-b03)

[√] VS Code (version 1.38.1)
• VS Code at C:\Users\xyz\AppData\Local\Programs\Microsoft VS Code
• Flutter extension version 3.4.1

[√] Connected device (2 available)
• Chrome • chrome • web-javascript • Google Chrome 77.0.3865.90
• Server • web • web-javascript • Flutter Tools

• No issues found!

[rostopira]

Why can't we just add empty function with same declaration in ios/android engine to silence this warning? That shouldn't take a week to fix

[escamoteur]

@rostopira Flutter Web is still in preview. 5 days ago we got this reported. We currently over 5000 open issues so it depends on the priority an issue has how fast it is Fixed.
You can make a PR to speed up things