/Dart/Null error due to delay in api response

Null error due to delay in api response

String text;

fetchData() async {
//...
  text = weatherData.weather[0].main ?? 'Waiting api response...';
//...
}

// in your build method
@override
Widget build(BuildContext context) {
  return Scaffold(
    body: Container(
      child: Text(text), //this will render "Waiting api response" first, and when the api result arrive, it will change
    ),
  );
}

Source: stackoverflow.com

Null error due to delay in api response

Future fetchDataCity() async {
  // your code
  weatherCity = WeatherCity.fromJson(cityDecodedJson);
  return weatherCity;
}

Future fetchDataWeather() async {
  // your code
  weatherData = WeatherData.fromJson(decodedJson);
  return weatherData;
}

// in your build method
@override
Widget build(BuildContext context) {
  return Scaffold(
    body: Container(
      child: FutureBuilder(
        future: fetchDataWeather(), // a previously-obtained Future or null
        builder: (BuildContext context, AsyncSnapshot<String> snapshot) {
          switch (snapshot.connectionState)
            case ConnectionState.active:
            case ConnectionState.waiting:
              return Text('Awaiting result...'); //or a placeholder
            case ConnectionState.done:
              if (snapshot.hasError){
                return Text('Error: ${snapshot.error}');
              } else {
                return Text('Error: ${snapshot.data}');
            }
         },
      ) //FutureBuilder
    ),
  );
}

Source: stackoverflow.com

Similar codes

5 votes150 views2 answers
Padding flutter top
Dart
0 vote139 views1 answer
Flutter disable android back button
Dart
1 vote138 views1 answer
Generate method o dart list
Dart
11 votes139 views5 answers
Toast in flutter
Dart
0 vote86 views1 answer
Flutter listview inside sliverlist
Dart
4 votes142 views3 answers
Round container flutter
Dart
33 votes265 views5 answers
Flutter String to dateTime format
Dart
0 vote131 views1 answer
Invalid argument(s): join(null, "bin", "cache", "dart-sdk"): part 0 was null, but part 1 was not.
Dart
19 votes175 views2 answers
Get unique random numbers dart
Dart
0 vote136 views2 answers
Flutter how to disable splash on listview
Dart