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 ), ); }
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