PlatformException (PlatformException(channel-error, Unable to establish connection on channel., null, null)) on Android devices about flutter

[EMUNES]

Sure. I found that this issue only occur if shared_preferences is used with flutter_quill. Using shared_preferences with other dozens of packages in our project all works well. I will first check super_clipboard that flutter_quill depends on, which uses Platform Specific Configurations. If I find other problems, I will report.

[huycozy]

Hi @EMUNES
Your sample code above is production code and it's unclear which plugin is causing the issue. You should narrow down the issue by removing the usage of 3rd party plugins/packages one by one, unrelated/unaffected pages, and isolating the affected page into a minimal sample code that can produce the issue. And please share it here when you have such an example. Thanks!

[EMUNES]

Thanks @huycoz. I never thought a plugin can cause this big trouble to the project. Taking your suggestion, I can reproduce the exception if I had flutter_quill in my project. The exception persists from flutter_quill 9.0.0 to newest 9.3.10 version. The minimal example is as follows:

the minimal dependency in pubspec.yaml

name: fix
description: "A new Flutter project."
publish_to: "none"
version: 1.0.0+1

environment:
  sdk: ">=3.3.4 <4.0.0"

dependencies:
  flutter:
    sdk: flutter
  shared_preferences: ^2.2.3 # Persistent settings.
  flutter_quill: "9.0.0"

dev_dependencies:
  flutter_test:
    sdk: flutter

flutter:
  uses-material-design: true

the minimal production code to run

import 'dart:async';

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

Future<void> main() async {
  WidgetsFlutterBinding.ensureInitialized();

  final prefs = await SharedPreferences.getInstance();

  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        colorScheme: ColorScheme.fromSeed(seedColor: Colors.deepPurple),
        useMaterial3: true,
      ),
      home: const MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

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

  final String title;

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

class _MyHomePageState extends State<MyHomePage> {
  @override
  Widget build(BuildContext context) {
    return Container();
  }
}

It looks like I have found the problem. Everything was fine before, it could be flutter pub upgrade certain dependencies under flutter_quill. Maybe I should raise an issue there?

[huycozy]

Well, since you left shared_preferences in the sample code above, I re-checked this using its package example but couldn't reproduce the issue.

I think it may not issue of flutter_quill because I don't see it has platform implementation (it's a normal package as I can see) but it could be caused by a plugin that it's depending on, see its Platform Specific Configurations.

So, if the issue appears when you only import and use flutter_quill package, you should report the issue on its repository for better support there. In case you can narrow it down and find something new that you think this is a Flutter 1st party package bug, please write in comments.

[EMUNES]

It's a package issue related to rust language recent changes. Fixed by irondash/irondash#51.