[url_launcher]Error: setState() called after dispose(): _PlatformViewLinkState#946fb(lifecycle state: defunct, not mounted)

[kristoffer-zliide]

onPlatformViewCreated calls setState(), so it probably shouldn't be called indiscriminately after an async operation. Or, maybe onPlatformViewCreated shouldn't call setState without checking mounted state.

Easily reproducible by making a large list of widgets with Links and scroll through it.

Doctor summary (to see all details, run flutter doctor -v):
[✓] Flutter (Channel stable, 2.10.5, on Microsoft Windows [Version 10.0.22000.613], locale en-DK)
[!] Android toolchain - develop for Android devices (Android SDK version 33.0.0-rc2)
    ✗ cmdline-tools component is missing
      Run `path/to/sdkmanager --install "cmdline-tools;latest"`
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      Run `flutter doctor --android-licenses` to accept the SDK licenses.
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[✓] Chrome - develop for the web
[✓] Visual Studio - develop for Windows (Visual Studio Build Tools 2019 16.9.4)
[✓] Android Studio (version 2021.1)
[✓] VS Code (version 1.66.2)
[✓] VS Code, 64-bit edition
[✓] Connected device (4 available)
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! Doctor found issues in 1 category.

[maheshj01]

Hi @kristoffer-zliide, Thanks for filing the issue. Please share a minimal and complete reproducible code to better address the issue

[kristoffer-zliide]

@maheshmnj: I updated the example in a pull request that may fix it. You need to scroll quite aggressively in that simple example to reproduce it 😄

[kristoffer-zliide]

The error I get when I scroll in that list:

This error happens if you call setState() on a State object for a widget that no longer appears in the widget tree (e.g., whose parent widget no longer includes the widget in its build). This error can occur when code calls setState() from a timer or an animation callback.
The preferred solution is to cancel the timer or stop listening to the animation in the dispose() callback. Another solution is to check the "mounted" property of this object before calling setState() to ensure the object is still in the tree.
This error might indicate a memory leak if setState() is being called because another object is retaining a reference to this State object after it has been removed from the tree. To avoid memory leaks, consider breaking the reference to this object during dispose().
    at Object.throw_ [as throw] (http://localhost:55799/dart_sdk.js:5067:11)
at http://localhost:55799/packages/flutter/src/widgets/widget_inspector.dart.lib.js:12948:23
at platform_view$._PlatformViewLinkState.new.setState (http://localhost:55799/packages/flutter/src/widgets/widget_inspector.dart.lib.js:12954:28)
at platform_view$._PlatformViewLinkState.new.[_onPlatformViewCreated] (http://localhost:55799/packages/flutter/src/widgets/platform_view.dart.lib.js:1134:12)
at http://localhost:55799/packages/url_launcher_web/src/link.dart.lib.js:277:12
    at _RootZone.runUnary (http://localhost:55799/dart_sdk.js:40441:59)
    at _FutureListener.then.handleValue (http://localhost:55799/dart_sdk.js:35363:29)
    at handleValueCallback (http://localhost:55799/dart_sdk.js:35931:49)
    at Function._propagateToListeners (http://localhost:55799/dart_sdk.js:35969:17)
    at _Future.new.[_completeWithValue] (http://localhost:55799/dart_sdk.js:35817:23)
    at async._AsyncCallbackEntry.new.callback (http://localhost:55799/dart_sdk.js:35838:35)
    at Object._microtaskLoop (http://localhost:55799/dart_sdk.js:40708:13)
    at _startMicrotaskLoop (http://localhost:55799/dart_sdk.js:40714:13)
    at http://localhost:55799/dart_sdk.js:36191:9```

[maheshj01]

Thanks for the code sample @kristoffer-zliide, Can you please clarify on which platform is this issue on ?

Screen.Recording.2022-04-29.at.12.27.02.PM.mov

You need to scroll quite aggressively in that simple example to reproduce it 😄

I tried to reproduce the issue on Android, either I was not aggressive enough xD or the bug does not exist on Android

code sample

import 'package:flutter/gestures.dart';
import 'package:flutter/material.dart';
import 'package:url_launcher/link.dart';

void main() {
  runApp(MyApp());
}

class _HorizontalScrollBehavior extends MaterialScrollBehavior {
  @override
  Set<PointerDeviceKind> get dragDevices => <PointerDeviceKind>{
        PointerDeviceKind.touch,
        PointerDeviceKind.stylus,
        PointerDeviceKind.invertedStylus,
        PointerDeviceKind.mouse,
      };
}

/// App for testing
class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) => MaterialApp(
        home: Scaffold(
          body: ConstrainedBox(
            constraints: const BoxConstraints(maxHeight: 300),
            child: const _List(),
          ),
        ),
      );
}

class _List extends StatelessWidget {
  const _List({
    Key? key,
  }) : super(key: key);

  @override
  Widget build(BuildContext context) => ScrollConfiguration(
        behavior: _HorizontalScrollBehavior(),
        child: ListView.separated(
          scrollDirection: Axis.horizontal,
          itemCount: 500,
          separatorBuilder: (_, __) => const SizedBox(height: 24, width: 24),
          itemBuilder: (_, int index) => Link(
            uri: Uri.parse('https://example.com/$index'),
            builder: (_, __) => GestureDetector(
              onTap: () {
                ScaffoldMessenger.of(context).showSnackBar(
                    SnackBar(content: Text('https://example.com/$index')));
              },
              child: Card(
                  child: Padding(
                padding: const EdgeInsets.all(64),
                child: Text('#$index', textAlign: TextAlign.center),
              )),
            ),
          ),
        ),
      );
}

flutter doctor -v (mac)

[✓] Flutter (Channel stable, 2.10.5, on macOS 12.3 21E230 darwin-arm, locale en-IN)
    • Flutter version 2.10.5 at /Users/mahesh/Documents/flutter
    • Upstream repository https://github.com/flutter/flutter.git
    • Framework revision 5464c5bac7 (12 hours ago), 2022-04-18 09:55:37 -0700
    • Engine revision 57d3bac3dd
    • Dart version 2.16.2
    • DevTools version 2.9.2

[✓] Android toolchain - develop for Android devices (Android SDK version 31.0.0)
    • Android SDK at /Users/mahesh/Library/Android/sdk
    • Platform android-32, build-tools 31.0.0
    • ANDROID_HOME = /Users/mahesh/Library/Android/sdk
    • Java binary at: /Applications/Android Studio.app/Contents/jre/Contents/Home/bin/java
    • Java version OpenJDK Runtime Environment (build 11.0.11+0-b60-7772763)
    • All Android licenses accepted.

[✓] Xcode - develop for iOS and macOS (Xcode 13.2.1)
    • Xcode at /Applications/Xcode.app/Contents/Developer
    • CocoaPods version 1.10.2

[✓] Chrome - develop for the web
    • Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome

[✓] Android Studio (version 2021.1)
    • Android Studio at /Applications/Android Studio.app/Contents
    • Flutter plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/9212-flutter
    • Dart plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/6351-dart
    • Java version OpenJDK Runtime Environment (build 11.0.11+0-b60-7772763)

[✓] IntelliJ IDEA Community Edition (version 2021.2.1)
    • IntelliJ at /Applications/IntelliJ IDEA CE.app
    • Flutter plugin version 61.2.4
    • Dart plugin version 212.5080.8

[✓] VS Code (version 1.65.2)
    • VS Code at /Applications/Visual Studio Code.app/Contents
    • Flutter extension version 3.39.20220405

[✓] Connected device (4 available)
    • Redmi K20 Pro (mobile) • 192.168.1.2:55555                    • android-arm64  • Android 11 (API 30)
    • iPhone 12 Pro (mobile) • 535317A4-921C-488F-B234-C2CC6D4AE5A1 • ios            • com.apple.CoreSimulator.SimRuntime.iOS-14-5 (simulator)
    • macOS (desktop)        • macos                                • darwin-arm64   • macOS 12.3 21E230 darwin-arm
    • Chrome (web)           • chrome                               • web-javascript • Google Chrome 100.0.4896.88

[✓] HTTP Host Availability
    • All required HTTP hosts are available

• No issues found!

[kristoffer-zliide]

@maheshmnj: Try a desktop browser and scrolling with the mouse.

[maheshj01]

@kristoffer-zliide Unfortunately that doesn't seem to make any difference , I am unable to reproduce the error on Windows Web / Desktop app

2022-04-29.20-01-53_Trim.mp4

2022-04-29.19-44-26_Trim.mp4

flutter doctor -v (windows)

[√] Flutter (Channel stable, 2.10.5, on Microsoft Windows [Version 10.0.19044.1645], locale en-US)
    • Flutter version 2.10.5 at C:\flutter_sdk\stable
    • Upstream repository https://github.com/flutter/flutter.git
    • Framework revision 5464c5bac7 (2 days ago), 2022-04-18 09:55:37 -0700
    • Engine revision 57d3bac3dd
    • Dart version 2.16.2
    • DevTools version 2.9.2

[√] Android toolchain - develop for Android devices (Android SDK version 31.0.0)
    • Android SDK at C:\Users\mahesh\AppData\Local\Android\sdk
    • Platform android-31, build-tools 31.0.0
    • Java binary at: C:\Program Files\Android\Android Studio\jre\bin\java      
    • Java version OpenJDK Runtime Environment (build 11.0.10+0-b96-7249189)    
    • All Android licenses accepted.

[√] Chrome - develop for the web
    • Chrome at C:\Program Files\Google\Chrome\Application\chrome.exe

[√] Visual Studio - develop for Windows (Visual Studio Community 2019 16.11.4)      
    • Visual Studio at C:\Program Files (x86)\Microsoft Visual Studio\2019\Community
    • Visual Studio Community 2019 version 16.11.31727.386
    • Windows 10 SDK version 10.0.19041.0

[√] Android Studio (version 2020.3)
    • Android Studio at C:\Program Files\Android\Android Studio
    • Flutter plugin can be installed from:
       https://plugins.jetbrains.com/plugin/9212-flutter
    • Dart plugin can be installed from:
       https://plugins.jetbrains.com/plugin/6351-dart
    • Java version OpenJDK Runtime Environment (build 11.0.10+0-b96-7249189)        

[√] VS Code (version 1.64.2)
    • VS Code at C:\Users\mahesh\AppData\Local\Programs\Microsoft VS Code
    • Flutter extension version 3.38.1

[√] Connected device (3 available)
    • Windows (desktop) • windows • windows-x64    • Microsoft Windows [Version 10.0.19044.1645]
    • Chrome (web)      • chrome  • web-javascript • Google Chrome 100.0.4896.127
    • Edge (web)        • edge    • web-javascript • Microsoft Edge 100.0.1185.44

[√] HTTP Host Availability
    • All required HTTP hosts are available

• No issues found!

details>

[kristoffer-zliide]

@maheshmnj: maybe a little more aggressive: 😃

Screen.Recording.mp4

Or, are you running directly from the PR, because there the issue is fixed?