flutter Unhandled Expection: PlatformException(channel-error, Unable to establish connection on channel., null, null)

Question

This error is not about firebase. Both shared_preferences and path_provider packages will report this error. This exception only appears on Android devices (both emulators and real devices). When building on Windows11, everything is normal. This exception troubles me because it suddenly occurs when I upgrade to flutter 3.19.6 and flutter upgrade some packages. All my codes should be normal:

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

  await ConfigService().initConfigurations();
  await DataStore().initDB();
  MediaKit.ensureInitialized();

  runApp(const ProviderScope(child: MyApp()));
}

  Future<void> initConfigurations() async {
    prefs = await SharedPreferences.getInstance();
  }

 Future<void> initDB() async {
    final dir = await getApplicationDocumentsDirectory();
}

ERROR:

 [ERROR:flutter/runtime/dart_vm_initializer.cc(41)] Unhandled Exception: PlatformException(channel-error, Unable to establish connection on channel., null, null)

It will be so good if anyone has clues to solve this problem. It came suddenly and I can no longer dev on Android since.

I have tried flutter pub outdated, flutter pub upgrade outdated_package, flutter clean, flutter pub get then flutter run. Those just won't work.

Does this answer your question? Unhandled Exception: PlatformException(channel-error, Unable to establish connection on channel., null, null) — Kars
– Kars, Commented May 4, 2024 at 11:30
I have tried those solutions available on StackOverflow, none worked for me. I have also deletes and recreated android folder, and change flutter version. Still not work. — hzbhhh
– hzbhhh, Commented May 6, 2024 at 1:34

Jamal-o · Accepted Answer · 2025-03-13 07:34:52Z

If the problem is specifically with release mode. It might be because Flutter obfuscates code and sometimes it create errors on Android or Java libraries. This might be the case if you see an error like this:

W/FlutterEngineCxnRegstry( 5882): Attempted to register plugin (J.a@3981a52) but it was already registered with this FlutterEngine (Y0.b@d346123).
W/FlutterEngineCxnRegstry( 5882): Attempted to register plugin (N0.e@3e1ec7f) but it was already registered with this FlutterEngine (Y0.b@d346123).
W/FlutterEngineCxnRegstry( 5882): Attempted to register plugin (J.a@67a944c) but it was already registered with this FlutterEngine (Y0.b@d346123).
W/FlutterEngineCxnRegstry( 5882): Attempted to register plugin (N0.e@5e2a938) but it was already registered with this FlutterEngine (Y0.b@d346123).
W/FlutterEngineCxnRegstry( 5882): Attempted to register plugin (J.a@e156750) but it was already registered with this FlutterEngine (Y0.b@d346123).
W/FlutterEngineCxnRegstry( 5882): Attempted to register plugin (V0.a@c778d49) but it was already registered with this FlutterEngine (Y0.b@d346123).
E/flutter ( 5882): [ERROR:flutter/runtime/dart_vm_initializer.cc(40)] Unhandled Exception: PlatformException(channel-error, Unable to establish connection on channel: "dev.flutter.pigeon.shared_preferences_android.SharedPreferencesApi.getAll"., null, null)

Here are the things I tried:

1. Add this to the app/build.gradle file:

buildTypes {  
release {  
            // add this lines  
            minifyEnabled true  
            shrinkResources true  
            proguardFiles getDefaultProguardFile(  
                    'proguard-android-optimize.txt'),  
                    'proguard-rules.pro'  
        }

2. If that doesn't fix it then, add this to the proguard-rules.pro file:

-if class * implements io.flutter.embedding.engine.plugins.FlutterPlugin
-keep,allowshrinking,allowobfuscation class <1>

See: Issue#154580 for more details

Phi Phụng Tạ · Accepted Answer · 2024-05-20 11:11:37Z

1

A temporary solution is changing minifyEnabled to false in your app-level gradle to solve the issue. Probably minifyEnabled: true with a proper proguard file is a more favor solution, I will try to update it

   buildTypes {
    debug {
        minifyEnabled false
        shrinkResources false
        debuggable true
        signingConfig signingConfigs.debug
    }
   release {
        minifyEnabled false
        shrinkResources false
        signingConfig signingConfigs.release
   }

}

answered May 20, 2024 at 11:11

Phi Phụng Tạ

191 bronze badge

1 Comment

user1034912 Over a year ago

2024 not working anymore

mlopez99 · Accepted Answer · 2024-07-11 00:01:40Z

1

Double check your Android emulator to make sure it targets the same API level for your Flutter project.

I had the same issue when my emulator was targeting API level 30 and creating an emulator that target API level 33 or 34 fixed it.

answered Jul 11, 2024 at 0:01

mlopez99

212 bronze badges

Comments

Muhammad Sarim · Accepted Answer · 2024-11-04 09:24:04Z

1

If you are using native bridge and adding flutter module into native iOS code add this line where you are initialising flutter engine GeneratedPluginRegistrant.register(with: flutterEngine!)

and

import FlutterPluginRegistrant

answered Nov 4, 2024 at 9:24

Muhammad Sarim

4105 silver badges11 bronze badges

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