Unhandled Exception: MissingPluginException(No implementation found for method check on channel plugins.flutter.io/connectivity)

问题

I already added connectivity plugin on my pubspec.yaml.

connectivity: ^0.4.6

But still getting this error:

E/flutter ( 4789): [ERROR:flutter/lib/ui/ui_dart_state.cc(148)] Unhandled Exception: MissingPluginException(No implementation found for method check on channel plugins.flutter.io/connectivity)
E/flutter ( 4789): #0 MethodChannel.invokeMethod (package:flutter/src/services/platform_channel.dart:314:7)
E/flutter ( 4789):
E/flutter ( 4789): #1 Connectivity.checkConnectivity (package:connectivity/connectivity.dart:73:47)

error connectivity is from this line :

  Future<ConnectivityResult> checkConnectivity() async {
    final String result = await methodChannel.invokeMethod<String>('check');
    return _parseConnectivityResult(result);
  }

and I never modified this package, But still get this error no matter what version of this plugin that I use. I hope anyone can help me to solve this error, thank you. Sorry for my bad English.

回答1:

This error mostly occurs when you try to Hot Reload or Hot Restart after just adding new package to your pubspec.yaml.

Just stop the running project(app) and then freshly run it again. So that the added package(which contains the implementations) also pushed to the device

回答2:

Following is irrelevant to above questing but the end result is same. I had complications with connectivity plugin and IOS configuration. So I use following method to check whether my app is connected to internet:

static Future<bool> checkInternetConnectivity() async {
    bool isConnected;
    try {
      final result = await InternetAddress.lookup('google.com');
      if (result.isNotEmpty && result[0].rawAddress.isNotEmpty) {
        isConnected = true;
      }
    } on SocketException catch (_) {
      isConnected = false;
    }
    return isConnected;
  }

AppUtil.checkInternetConnectivity().then((isOnline) async {
      if (isOnline) {...} else {...}
})

I never saw google website going down. If I wanted to listen to internet connectivity, I use timer.

If you want to check mobile data connectivity or wifi data connectivity, sorry! you will still have to go on implementing connectivity.

回答3:

this problem is solved by manuaally edit and add line on your android GeneratedPluginRegistrant, like this:

import io.flutter.plugins.connectivity.ConnectivityPlugin;

ConnectivityPlugin.registerWith(registry.registrarFor("io.flutter.plugins.connectivity.ConnectivityPlugin"));

回答4:

Flutter clean on terminal, stop the build and running again worked for me

来源：https://stackoverflow.com/questions/60087278/unhandled-exception-missingpluginexceptionno-implementation-found-for-method-c

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