Classy-Bear

 @override
  void initState() {
    super.initState();
    connectivity = Connectivity();
    subscription =
      connectivity.onConnectivityChanged.listen((ConnectivityResult result) {
        if (result == ConnectivityResult.wifi || result == ConnectivityResult.mobile) {
          setState(() {});
        }
      });

Classy-Bear

import 'package:connectivity/connectivity.dart';
...
Connectivity connectivity;
StreamSubscription<ConnectivityResult> subscription;

Classy-Bear

FutureBuilder(
    future: getData(),
    builder: (BuildContext context, AsyncSnapshot snapshot) {
      if (snapshot.hasError) {
          return Center(child: Text('Error'));
      }
      if (snapshot.connectionState == ConnectionState.done) {
          var mydata = snapshot.data;
          return Center(child: Text('${mydata['data'][0]['email']}'));
      } else {

Classy-Bear

FutureBuilder(
    future: getData(),
    builder: (BuildContext context, AsyncSnapshot snapshot) {}
)

Classy-Bear

Future getData() async {
  http.Response response = await http.get("https://reqres.in/api/users");
  if (response.statusCode == HttpStatus.ok) {
    var result = jsonDecode(response.body);
    return result;
  }
}

Classy-Bear

import 'package:http/http.dart' as http;
...
FutureBuilder(
    builder: (BuildContext context, AsyncSnapshot snapshot) {}
)