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'WidgetsBinding' runtime warnings using 3.0.0 stable release #103561

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'WidgetsBinding' runtime warnings using 3.0.0 stable release#103561
Labels
P2Important issues not at the top of the work lista: error messageError messages from the Flutter frameworka: null-safetySupport for Dart's null safety featurecustomer: crowdAffects or could affect many people, though not necessarily a specific customer.frameworkflutter/packages/flutter repository. See also f: labels.r: solvedIssue is closed as solved
@pattobrien

Description

@pattobrien
pattobrien
opened on May 12, 2022

Pre-Requisites

  • Flutter installed with the latest 3.0.0 stable, using FVM version manager.

Steps to Reproduce

  1. Execute flutter create test_app to create a new app
  2. Execute flutter run to build and run app

Expected results:

No warnings in debug console.

Actual results:

The following warnings are seen:

 Warning: Operand of null-aware operation '!' has type 'SchedulerBinding' which excludes null.
../…/src/framework.dart:275
- 'SchedulerBinding' is from 'package:flutter/src/scheduler/binding.dart' ('../../../fvm/versions/stable/packages/flutter/lib/src/scheduler/binding.dart').
package:flutter/…/scheduler/binding.dart:1
    if (SchedulerBinding.instance!.schedulerPhase ==
                         ^
: Warning: Operand of null-aware operation '!' has type 'WidgetsBinding' which excludes null.
../…/src/widgets_binding_observer.dart:42
- 'WidgetsBinding' is from 'package:flutter/src/widgets/binding.dart' ('../../../fvm/versions/stable/packages/flutter/lib/src/widgets/binding.dart').
package:flutter/…/widgets/binding.dart:1
    _state = WidgetsBinding.instance!.lifecycleState;
                            ^

: Warning: Operand of null-aware operation '!' has type 'WidgetsBinding' which excludes null.
../…/src/widgets_binding_observer.dart:43
- 'WidgetsBinding' is from 'package:flutter/src/widgets/binding.dart' ('../../../fvm/versions/stable/packages/flutter/lib/src/widgets/binding.dart').
package:flutter/…/widgets/binding.dart:1
    WidgetsBinding.instance!.addObserver(this);
                   ^
: Warning: Operand of null-aware operation '!' has type 'WidgetsBinding' which excludes null.
../…/src/widgets_binding_observer.dart:52
Code sample 
import 'package:flutter/material.dart';

void main() {
  WidgetsFlutterBinding.ensureInitialized();

  runApp(const MyApp());
}

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

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: const MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  const MyHomePage({Key? key, required this.title}) : super(key: key);

  final String title;

  @override
  State<MyHomePage> createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  int _counter = 0;

  void _incrementCounter() {
    setState(() {
      _counter++;
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            const Text(
              'You have pushed the button this many times:',
            ),
            Text(
              '$_counter',
              style: Theme.of(context).textTheme.headline4,
            ),
          ],
        ),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: _incrementCounter,
        tooltip: 'Increment',
        child: const Icon(Icons.add),
      ),
    );
  }
}
Logs 
fvm flutter analyze
Analyzing custom_widgets_custom_themes...                       
No issues found! (ran in 0.9s)

[✓] Flutter (Channel stable, 3.0.0, on macOS 12.3.1 21E258 darwin-arm, locale en-US)
    • Flutter version 3.0.0 at /Users/pattobrien/fvm/versions/stable
    • Upstream repository https://github.com/flutter/flutter.git
    • Framework revision ee4e09cce0 (2 days ago), 2022-05-09 16:45:18 -0700
    • Engine revision d1b9a6938a
    • Dart version 2.17.0
    • DevTools version 2.12.2

[✓] Android toolchain - develop for Android devices (Android SDK version 33.0.0-rc1)
    • Android SDK at /Users/pattobrien/Library/Android/sdk
    • Platform android-31, build-tools 33.0.0-rc1
    • 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 13.3.1)
    • Xcode at /Applications/Xcode.app/Contents/Developer
    • CocoaPods version 1.11.3

[✓] 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)

[✓] VS Code (version 1.67.1)
    • VS Code at /Applications/Visual Studio Code.app/Contents
    • Flutter extension version 3.40.0

[✓] Connected device (2 available)
    • iPhone 12 Pro (mobile) • 0296EE26-719D-4F1A-B59D-50FCB6EC3F7E • ios          • com.apple.CoreSimulator.SimRuntime.iOS-15-4
      (simulator)
    • macOS (desktop)        • macos                                • darwin-arm64 • macOS 12.3.1 21E258 darwin-arm

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

• No issues found!

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    P2Important issues not at the top of the work lista: error messageError messages from the Flutter frameworka: null-safetySupport for Dart's null safety featurecustomer: crowdAffects or could affect many people, though not necessarily a specific customer.frameworkflutter/packages/flutter repository. See also f: labels.r: solvedIssue is closed as solved

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