connectivity

import 'dart:async';
import 'dart:io';
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';

class HomePage extends StatefulWidget {
  final String origem;

  HomePage(this.origem);

  @override
  _HomePageState createState() => _HomePageState();
}

class _HomePageState extends State<HomePage> {
  PageController _pageCtrl = PageController();
  String _connectionStatus = 'Unknown';
  final Connectivity _connectivity = Connectivity();
  StreamSubscription<ConnectivityResult> _connectivitySubscription;

  @override
  void initState() {
    super.initState();

    initConnectivity();
    _connectivitySubscription =
        _connectivity.onConnectivityChanged.listen(_updateConnectionStatus);
  }

  Future<void> initConnectivity() async {
    ConnectivityResult result;
    // Platform messages may fail, so we use a try/catch PlatformException.
    try {
      result = await _connectivity.checkConnectivity();
    } on PlatformException catch (e) {
      print(e.toString());
    }

    // If the widget was removed from the tree while the asynchronous platform
    // message was in flight, we want to discard the reply rather than calling
    // setState to update our non-existent appearance.
    if (!mounted) {
      return Future.value(null);
    }

    return _updateConnectionStatus(result);
  }

  Future<void> _updateConnectionStatus(ConnectivityResult result) async {
    switch (result) {
      case ConnectivityResult.wifi:
        String wifiName, wifiBSSID, wifiIP;

        try {
          if (Platform.isIOS) {
            LocationAuthorizationStatus status =
                await _connectivity.getLocationServiceAuthorization();
            if (status == LocationAuthorizationStatus.notDetermined) {
              status =
                  await _connectivity.requestLocationServiceAuthorization();
            }
            if (status == LocationAuthorizationStatus.authorizedAlways ||
                status == LocationAuthorizationStatus.authorizedWhenInUse) {
              wifiName = await _connectivity.getWifiName();
            } else {
              wifiName = await _connectivity.getWifiName();
            }
          } else {
            wifiName = await _connectivity.getWifiName();
          }
        } on PlatformException catch (e) {
          print(e.toString());
          wifiName = "Failed to get Wifi Name";
        }

        try {
          if (Platform.isIOS) {
            LocationAuthorizationStatus status =
                await _connectivity.getLocationServiceAuthorization();
            if (status == LocationAuthorizationStatus.notDetermined) {
              status =
                  await _connectivity.requestLocationServiceAuthorization();
            }
            if (status == LocationAuthorizationStatus.authorizedAlways ||
                status == LocationAuthorizationStatus.authorizedWhenInUse) {
              wifiBSSID = await _connectivity.getWifiBSSID();
            } else {
              wifiBSSID = await _connectivity.getWifiBSSID();
            }
          } else {
            wifiBSSID = await _connectivity.getWifiBSSID();
          }
        } on PlatformException catch (e) {
          print(e.toString());
          wifiBSSID = "Failed to get Wifi BSSID";
        }

        try {
          wifiIP = await _connectivity.getWifiIP();
        } on PlatformException catch (e) {
          print(e.toString());
          wifiIP = "Failed to get Wifi IP";
        }

        setState(() {
          _connectionStatus = '$result\n'
              'Wifi Name: $wifiName\n'
              'Wifi BSSID: $wifiBSSID\n'
              'Wifi IP: $wifiIP\n';
        });
        break;
      case ConnectivityResult.mobile:
      case ConnectivityResult.none:
        setState(() => _connectionStatus = result.toString());
        _scaffoldKey.currentState.showSnackBar(SnackBar(
          duration: Duration(seconds: 3),
          backgroundColor: Colors.green,
          content: Text("Você está online novamente."),
        ));
        break;
      default:
        setState(() => _connectionStatus = 'Unknow');
        _scaffoldKey.currentState.showSnackBar(SnackBar(
          duration: Duration(seconds: 3),
          backgroundColor: Colors.red,
          content: Text("Você está offline no momento."),
        ));
        break;
    }
  }

  @override
  Widget build(BuildContext){...}
}