Flutter obtains the current network type

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By using the plug-in Connectivity, you can obtain whether the current device is connected to the Internet and whether the current network type is WIFI or mobile network

So the first step is to load the plug-in, first of allThe pub warehouseThe latest version of the search plugin

Then add the latest version to the Flutter project configuration file

Then import the header file when you use it

import 'package:connectivity/connectivity.dart';
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  // Get the network type
  String _netType;

  void isConnectedType(a) async {
    // Get the network connection type
    var connectivityResult = await (Connectivity().checkConnectivity());
    
    if (connectivityResult == ConnectivityResult.mobile) {
      // The network type is mobile
      _netType = "4G";
    } else if (connectivityResult == ConnectivityResult.wifi) {
      // The network type is WIFI
      _netType = "WIFI";
    }else{
      _netType = "Unjoined";
    }
    setState(() {});
  }
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Of course, you can directly determine whether the network is connected based on the connectivityResult

// Check whether the network is connected
  Future<bool> isConnected(a) async {
    var connectivityResult = await (Connectivity().checkConnectivity());
    returnconnectivityResult ! = ConnectivityResult.none; }Copy the code

Of course, when your network changes, you can also set up monitoring here

  // Add network switch listener
  connectLiserner() async {
    / / get the Stream
    Stream<ConnectivityResult> resultStream =
        Connectivity().onConnectivityChanged;
    // Add a listener
    resultStream.listen((event) {
      //
    });
  }
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The completion of

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