Dart 在 Flutter 中以间隔自动获取 API 数据

在我的Flutter 应用程序上，我试图显示更新的数据.我成功地从气象API手动获取了数据.但我需要每隔5秒不断地抓取数据.所以它应该会自动更新.下面是我的代码:

class MyApp extends StatelessWidget {

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Sakarya Hava',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: Scaffold(
        appBar: AppBar(
          title: Text('Sakarya Hava'),
        ),
        body: Center(
          child: FutureBuilder<SakaryaAir>(
            future: getSakaryaAir(), //sets the getSakaryaAir method as the expected Future
            builder: (context, snapshot) {
              if (snapshot.hasData) { //checks if the response returns valid data
                return Center(
                  child: Column(
                    children: <Widget>[
                      Text("${snapshot.data.temp}"), //displays the temperature
                      SizedBox(
                        height: 10.0,
                      ),
                      Text(" - ${snapshot.data.humidity}"), //displays the humidity
                    ],
                  ),
                );
              } else if (snapshot.hasError) { //checks if the response throws an error
                return Text("${snapshot.error}");
              }
              return CircularProgressIndicator();
            },
          ),
        ),
      ),
    );
  }


  Future<SakaryaAir> getSakaryaAir() async {
    String url = 'http://api.openweathermap.org/data/2.5/weather?id=740352&APPID=6ccf09034c9f8b587c47133a646f0e8a';
    final response =
    await http.get(url, headers: {"Accept": "application/json"});


    if (response.statusCode == 200) {
      return SakaryaAir.fromJson(json.decode(response.body));
    } else {
      throw Exception('Failed to load post');
    }
  }
}

我发现这样一个片段可以从中受益:

// runs every 5 second
Timer.periodic(new Duration(seconds: 5), (timer) {
   debugPrint(timer.tick);
});

可能我需要用这段代码包装并调用FutureBuilder，但我不能理解如何做到这一点.