visibility_detector 0.3.0 breaks the build

[alexeyinkin]

Steps to reproduce

1. In Android Studio, create a new Flutter project.
2. Add visibility_detector: ^0.3.0 to pubspec.yaml
3. Replace main.dart with the following:

import 'package:flutter/material.dart';
import 'package:visibility_detector/visibility_detector.dart';

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

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

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      home: VisibilityDetector(
        key: ValueKey(1),
        child: Scaffold(),
        onVisibilityChanged: (_) {},
      ),
    );
  }
}

Expected behavior

The app builds.

Actual behavior

Launching lib/main.dart on SM T585 in debug mode...
Running Gradle task 'assembleDebug'...
../../../snap/flutter/common/flutter/.pub-cache/hosted/pub.dartlang.org/visibility_detector-0.3.0/lib/src/visibility_detector_layer.dart:126:37: Error: Property 'renderView' cannot be accessed on 'RendererBinding?' because it is potentially null.
 - 'RendererBinding' is from 'package:flutter/src/rendering/binding.dart' ('../../../snap/flutter/common/flutter/packages/flutter/lib/src/rendering/binding.dart').
Try accessing using ?. instead.
    assert(RendererBinding.instance.renderView != null);
                                    ^^^^^^^^^^
../../../snap/flutter/common/flutter/.pub-cache/hosted/pub.dartlang.org/visibility_detector-0.3.0/lib/src/visibility_detector_layer.dart:127:59: Error: Property 'renderView' cannot be accessed on 'RendererBinding?' because it is potentially null.
 - 'RendererBinding' is from 'package:flutter/src/rendering/binding.dart' ('../../../snap/flutter/common/flutter/packages/flutter/lib/src/rendering/binding.dart').
Try accessing using ?. instead.
    var clipRect = Offset.zero & RendererBinding.instance.renderView.size;
                                                          ^^^^^^^^^^
../../../snap/flutter/common/flutter/.pub-cache/hosted/pub.dartlang.org/visibility_detector-0.3.0/lib/src/visibility_detector_layer.dart:170:35: Error: Method 'addPostFrameCallback' cannot be called on 'SchedulerBinding?' because it is potentially null.
 - 'SchedulerBinding' is from 'package:flutter/src/scheduler/binding.dart' ('../../../snap/flutter/common/flutter/packages/flutter/lib/src/scheduler/binding.dart').
Try calling using ?. instead.
        SchedulerBinding.instance.addPostFrameCallback((timeStamp) {
                                  ^^^^^^^^^^^^^^^^^^^^
../../../snap/flutter/common/flutter/.pub-cache/hosted/pub.dartlang.org/visibility_detector-0.3.0/lib/src/visibility_detector_layer.dart:194:10: Error: Method 'scheduleTask' cannot be called on 'SchedulerBinding?' because it is potentially null.
 - 'SchedulerBinding' is from 'package:flutter/src/scheduler/binding.dart' ('../../../snap/flutter/common/flutter/packages/flutter/lib/src/scheduler/binding.dart').
Try calling using ?. instead.
        .scheduleTask<void>(_processCallbacks, Priority.touch);
         ^^^^^^^^^^^^


FAILURE: Build failed with an exception.

* Where:
Script '/home/alexey/snap/flutter/common/flutter/packages/flutter_tools/gradle/flutter.gradle' line: 1102

* What went wrong:
Execution failed for task ':app:compileFlutterBuildDebug'.
> Process 'command '/home/alexey/snap/flutter/common/flutter/bin/flutter'' finished with non-zero exit value 1

* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.

* Get more help at https://help.gradle.org

BUILD FAILED in 28s
Exception: Gradle task assembleDebug failed with exit code 1

[alexeyinkin]

At https://pub.dev/packages/visibility_detector/score
the score also shows broken static analysis with some of the above errors.

[alexeyinkin]

I understand that in Flutter 2.13 all these nullable getters become non-nullable. So the real problem here is missing Flutter 2.13 in pubspec.yaml:

environment:
  sdk: '>=2.12.0 <3.0.0'
  flutter: '>=2.10.5'

[mark8044]

Same exact issue for me, for now went back to 0.2.2

[meg4cyberc4t]

The same problem. Please fix it 🙏🏻

[hicnar]

Same here, back to 0.2.2. Write some tests before releasing your stuff please!

[meg4cyberc4t]

Same here, back to 0.2.2. Write some tests before releasing your stuff please!

Yes, there are tests, but only on flutter 2.10.5 they do not pass)
(Thanks for the temporary solution)

[hicnar]

If tests run against the latest stable release do not pass, then why the library gets released one might ask?
Hopefully this will get fixed soon.

[gysipos]

+1 for the issue

[dhanrajVerma]

facing exactly same issue
+1 for the issue

[loic-hamdi]

Any solution please?

[mark8044]

Any solution please?

Just downgrade back to 0.2.2, its not like 0.3.0 has any new feature

[meg4cyberc4t]

Any solution please?

Just downgrade back to 0.2.2, its not like 0.3.0 has any new feature

My solution was to use scroll_to_index (https://pub.dev/packages/scroll_to_index)