canvasing/lib/Screens/CheckInternetConnection/CheckInternetConnection.dart

import 'dart:async';
import 'dart:developer' as developer;

import 'package:connectivity_plus/connectivity_plus.dart';
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:google_fonts/google_fonts.dart';
import 'package:lottie/lottie.dart';

class MyHomePage extends StatefulWidget {
  @override
  State<MyHomePage> createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  ConnectivityResult _connectionStatus = ConnectivityResult.none;
  final Connectivity _connectivity = Connectivity();
  late StreamSubscription<ConnectivityResult> _connectivitySubscription;

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

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

  @override
  void dispose() {
    _connectivitySubscription.cancel();
    super.dispose();
  }

  // Platform messages are asynchronous, so we initialize in an async method.
  Future<void> initConnectivity() async {
    late ConnectivityResult result;
    // Platform messages may fail, so we use a try/catch PlatformException.
    try {
      result = await _connectivity.checkConnectivity();
    } on PlatformException catch (e) {
      developer.log('Couldn\'t check connectivity status', error: e);
      return;
    }

    // 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 {
    setState(() {
      _connectionStatus = result;
    });
  }

  @override
  Widget build(BuildContext context) {
    return Container(
      child: Column(
        children: [
          SizedBox(
            width: 250,
            height: 250,
            child: LottieBuilder.asset(
                'assets/animation/animation_no_internet.json',
                repeat: true),
          ),
          Text(
            "No Internet Connection",
            style: GoogleFonts.josefinSans(fontSize: 18),
          ),
          Padding(
            padding: EdgeInsets.all(15),
            child: Text(
              'You Are Not Connected to The Internet. Please check your Wifi or Mobile Data!',
              style: GoogleFonts.zillaSlab(fontSize: 16),
            ),
          ),
          ElevatedButton(
              onPressed: (){

              },
              child: Text("Retry",
                  textAlign: TextAlign.center,
                  style: TextStyle(
                      color: Colors.white,
                      fontSize: 17,
                      fontWeight: FontWeight.w500)
              )
          )
        ],
      ),
    );
  }
}