PageView.onPageChanged not called for first Page

The PageView.onPageChanged has the following documentation:

Called whenever the page in the center of the viewport changes.

On my tests I can see that it does notify every time the page changes... BUT it doesn't notify when the first page is loaded for the first time. As I understand it, it should notify also when the first page loads for the first time, as it qualifies as a "page in the center of the viewport change".

very annoying issue, any updates on that?

Persists with current master 1.21.0-6.0.pre.129

code sample

import 'package:flutter/material.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        body: PageViewDemo(),
      ),
    );
  }
}

class PageViewDemo extends StatefulWidget {
  @override
  _PageViewDemoState createState() => _PageViewDemoState();
}

class _PageViewDemoState extends State<PageViewDemo> {

  PageController _controller = PageController(
    initialPage: 0,
  );

  @override
  void dispose() {
    _controller.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return PageView(
      controller: _controller,
      onPageChanged: (index) {
        print('Current page - $index');
      },
      children: List.generate(3, (index) => Center(child: Text(index.toString()))),
    );
  }
}

flutter doctor -v

[✓] Flutter (Channel master, 1.21.0-6.0.pre.129, on Mac OS X 10.15.6 19G73, locale en-GB)
    • Flutter version 1.21.0-6.0.pre.129 at /Users/nevercode/dev/flutter
    • Framework revision 30aef0a3b9 (14 hours ago), 2020-07-30 14:20:21 -0700
    • Engine revision a9910e409c
    • Dart version 2.10.0 (build 2.10.0-1.0.dev 24c7666def)

 
[✓] Android toolchain - develop for Android devices (Android SDK version 29.0.3)
    • Android SDK at /Users/nevercode/Library/Android/sdk
    • Platform android-29, build-tools 29.0.3
    • Java binary at: /Applications/Android Studio.app/Contents/jre/jdk/Contents/Home/bin/java
    • Java version OpenJDK Runtime Environment (build 1.8.0_242-release-1644-b3-6222593)
    • All Android licenses accepted.

[✓] Xcode - develop for iOS and macOS (Xcode 11.6)
    • Xcode at /Applications/Xcode.app/Contents/Developer
    • Xcode 11.6, Build version 11E708
    • CocoaPods version 1.9.1

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

[✓] Android Studio (version 4.0)
    • Android Studio at /Applications/Android Studio.app/Contents
    • Flutter plugin version 47.1.2
    • Dart plugin version 193.7361
    • Java version OpenJDK Runtime Environment (build 1.8.0_242-release-1644-b3-6222593)

[✓] VS Code (version 1.47.1)
    • VS Code at /Applications/Visual Studio Code.app/Contents
    • Flutter extension version 3.12.2

[✓] Connected device (6 available)
    • Redmi Note 7 (mobile)       • 6345c469                                 • android-arm64  • Android 9 (API 28)
    • Nevercode’s iPhone (mobile) • b668e524315069f3db3661ac11ff1f66afafebdb • ios            • iOS 13.6
    • iPhone 11 Pro Max (mobile)  • 55C8466B-5367-492B-8EFE-EC45D980571F     • ios            • com.apple.CoreSimulator.SimRuntime.iOS-13-6 (simulator)
    • macOS (desktop)             • macos                                    • darwin-x64     • Mac OS X 10.15.6 19G73
    • Web Server (web)            • web-server                               • web-javascript • Flutter Tools
    • Chrome (web)                • chrome                                   • web-javascript • Google Chrome 84.0.4147.105

• No issues found!

@feinstein

Hi @feinstein, I can no longer reproduce it, With the above code sample when I swipe left I see onPageChanged gets triggered (on the first swipe).

flutter doctor -v (mac)

[✓] Flutter (Channel stable, 3.0.3, on macOS 12.4 21F79 darwin-arm, locale en-IN)
    • Flutter version 3.0.3 at /Users/mahesh/Documents/flutter
    • Upstream repository https://github.com/flutter/flutter.git
    • Framework revision 676cefaaff (5 days ago), 2022-06-22 11:34:49 -0700
    • Engine revision ffe7b86a1e
    • Dart version 2.17.5
    • DevTools version 2.12.2

[✓] Android toolchain - develop for Android devices (Android SDK version 33.0.0-rc4)
    • Android SDK at /Users/mahesh/Library/Android/sdk
    • Platform android-32, build-tools 33.0.0-rc4
    • 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 11.0.12+0-b1504.28-7817840)
    • All Android licenses accepted.

[✓] Xcode - develop for iOS and macOS (Xcode 13.2.1)
    • Xcode at /Applications/Xcode.app/Contents/Developer
    • CocoaPods version 1.11.2

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

[✓] Android Studio (version 2021.2)
    • 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 11.0.12+0-b1504.28-7817840)

[✓] 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 1.67.2)
    • VS Code at /Applications/Visual Studio Code.app/Contents
    • Flutter extension version 3.43.20220621

[✓] Connected device (3 available)
    • sdk gphone arm64 (mobile) • emulator-5554 • android-arm64  • Android 11 (API 30) (emulator)
    • macOS (desktop)           • macos         • darwin-arm64   • macOS 12.4 21F79 darwin-arm
    • Chrome (web)              • chrome        • web-javascript • Google Chrome 103.0.5060.53

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

• No issues found!

Without additional information, we are unfortunately not sure how to resolve this issue. We are therefore reluctantly going to close this bug for now.
If you find this problem please file a new issue with the same description, what happens, logs and the output of 'flutter doctor -v'. All system setups can be slightly different so it's always better to open new issues and reference the related ones.
Thanks for your contribution.

This thread has been automatically locked since there has not been any recent activity after it was closed. If you are still experiencing a similar issue, please open a new bug, including the output of flutter doctor -v and a minimal reproduction of the issue.

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PageView.onPageChanged not called for first Page #37656

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PageView.onPageChanged not called for first Page #37656

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karabaralex commented on Sep 7, 2019

VladyslavBondarenko commented on Jul 31, 2020

maheshj01 commented on Jun 30, 2022

github-actions commented on Jul 21, 2022

github-actions commented on Aug 15, 2022

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