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
),
);
}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
),
);
}Copyright © 2021 Codeinu
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