Classy-Bear

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

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

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

Classy-Bear

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

Classy-Bear

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

Classy-Bear

//https://stackoverflow.com/questions/50360443/parsing-json-that-has-a-nested-array-of-objects-in-dart
genres = (jsonMap['genres'] as List).map((i) => Genre.fromJson(i)).toList()
///JSON Data
//{
//   "adult": false,
//    "backdrop_path": "/wrqUiMXttHE4UBFMhLHlN601MZh.jpg",
//    "belongs_to_collection": null,
//    "budget": 120000000,
//    "genres": [
//        {

Classy-Bear

 Future<void> _probarAutorizacion() async {
    bool podemosUsarAutorizacion = false;
    try {
      podemosUsarAutorizacion = await _autenticacion.canCheckBiometrics;
    } on PlatformException catch (e) {
      print(e);
    }

    if (!mounted) return;

Classy-Bear

  final LocalAuthentication _autenticacion = LocalAuthentication();
  bool _podemosUsarAutorizacion = false;
  String _autorizado = "No autorizado";
  List<BiometricType> _autorizacionesDisponibles = List<BiometricType>();