CODEWITHSUNDEEP
flutterbluetoothbackground-service
fli27
fli27

Reputation: 319

flutter_blue and background service : MissingPluginException No implementation found on channel

I want to make bluetooth work (connection to a device) in the background. but I get the following error:

E/flutter (15225): [ERROR:flutter/lib/ui/ui_dart_state.cc(199)] Unhandled Exception: MissingPluginException(No implementation found for method isAvailable on channel plugins.pauldemarco.com/flutter_blue/methods)
E/flutter (15225): #0      MethodChannel._invokeMethod (package:flutter/src/services/platform_channel.dart:156:7)
E/flutter (15225): <asynchronous suspension>
E/flutter (15225): #1      FlutterBlue._setLogLevelIfAvailable (package:flutter_blue/src/flutter_blue.dart:77:9)
E/flutter (15225): <asynchronous suspension>

To reproduce the problem it's very simple:

  1. Create a Flutter app

  2. Add the following packages:

    flutter pub add flutter_blue

    flutter pub add flutter_background_service

Then start the background service and trigger it

    void main() {
      WidgetsFlutterBinding.ensureInitialized();
      FlutterBackgroundService.initialize(onStart);
      runApp(MyApp());
    }

    void onStart() {
      WidgetsFlutterBinding.ensureInitialized();
      final service = FlutterBackgroundService();
      service.onDataReceived.listen((event) {
        if (event!["bluetooth"] == "start") {
          FlutterBlue flutterBlue = FlutterBlue.instance;
          flutterBlue.startScan(timeout: Duration(seconds: 4));
    
          var subscription = flutterBlue.scanResults.listen((results) {
            for (ScanResult r in results) {
              print('${r.device.name} found! rssi: ${r.rssi}');
            }
          });
    
          flutterBlue.stopScan();
          return;
        }
    
      });
    
      service.setForegroundMode(false);
    }



    IconButton(
      onPressed: (){
        FlutterBackgroundService().sendData({"bluetooth": "start"},);
        },
      icon: Icon(Icons.bluetooth),
    )

Thank you in advance for your help

Upvotes: 2

Views: 929

Answers (2)

Pratik Lakhani
Pratik Lakhani

Reputation: 341

In my case, This package is working fine. I have modified this package locally, and it is functioning well on Android. Since this package is new, I think it is still a work in progress.

Upvotes: 1

Xavier B
Xavier B

Reputation: 1

Use the FlutterBluePlus plugin which is more up to date...

It's almost a drop-in replacement : all you have to do is replace FlutterBlue by FlutterBluePlus in your code...

Upvotes: 0

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