flutter天气应用程序中的城市选择-flutter

Question

希望你做得好我是一个新手，我正在开发一个基本的天气应用程序作为入门。现在，一切都好了，除了城市名称。我不知道如何实现城市搜索功能，并根据位置从api中获取数据。在我的代码中，我手动定义了城市名称。这是我的代码：

import 'dart:ui';
import 'package:flutter/material.dart';
import 'package:carousel_slider/carousel_slider.dart';
import 'package:hava_chitor/Carousel.dart';
import 'package:hava_chitor/UnderCarousel.dart';
import 'package:http/http.dart' as http;
import 'dart:convert';
void main() => runApp(MyApp());
class MyApp extends StatefulWidget {
@override
_MyAppState createState() => _MyAppState();
}
class _MyAppState extends State<MyApp> {
var temp;
var name;
var humidity;
var description;
var city = 'London';
CarouselController buttonCarouselController = CarouselController();
Future getWeather() async {
http.Response response = await http.get(
"http://api.openweathermap.org/data/2.5/weather?q=$city&units=metric&appid=apikey");
var results = jsonDecode(response.body);
setState(() {
this.temp = results['main']['temp'];
this.name = results['name'];
this.humidity = results['main']['humidity'];
this.description = results['weather'][0]['main'];
});
}
@override
void initState() {
super.initState();
this.getWeather();
}
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Hava Chitor?',
theme: ThemeData(
primaryColor: Color(0xff424242),
),
home: Scaffold(
drawer: Drawer(),
appBar: AppBar(
actions: [
Padding(
padding: const EdgeInsets.all(15),
child: GestureDetector(
onTap: () {
print('kir');
},
child: Icon(
Icons.add_circle_outline,
color: Color(0xff5d5f64),
),
),
)
],
backgroundColor: Colors.transparent,
elevation: 0,
iconTheme: IconThemeData(color: Color(0xff5d5f64)),
title: Text(
'Hava Chitor?',
style: TextStyle(
color: Color(0xff5d5f64),
fontFamily: 'Sans',
fontWeight: FontWeight.w700),
),
centerTitle: true,
),
backgroundColor: Colors.white,
body: Padding(
padding: const EdgeInsets.symmetric(vertical: 1.0),
child: Column(
children: [
Carousel(name),
UnderCarousel(temp, description, humidity),
],
),
),
),
);
}
}

Answer 1

您需要添加一个TextField和一个TextFieldController，并在用户写完城市名称时调用函数getWeather，类似于以下

String city;
TextEditingController textEditingController = TextEditingController();
TextField(
controller: textEditingController,
onSubmitted: (value){
city = textEditingController.text;
getWeather();
},
),

Answer 2

您需要做的是为用户添加TextField以输入城市名称。你可以做到这一点的方法已经在前面展示过了。接下来要做的是编写一个函数来获取带有城市名称的天气数据。

var url =
'http://api.openweathermap.org/data/2.5/weather?q=$city&units=metric&appid=apikey';
class CityWeatherData {
final String city, temprateure, humidity; //...
CityWeatherData({
this.city,
this.temprateure,
this.humidity,
// ...
});
factory CityWeatherData.fromJson(Map<String, dynamic> json) {
return CityWeatherData(
city: json['city'],
humidity: json['city']['humidity'],
temprateure: json['city']['temp'],
// ...
);
}
}
Future<CityWeatherData> fetchWeatherDataBycity() async {
final response = await http.get(url);
if (response.statusCode == 200) {
return CityWeatherData.fromJson(jsonDecode(response.body));
} else {
throw Exception('failed to fetch data.');
}
}

根据您获得的JSON数据，您必须编辑fromjson方法。

我希望这是有帮助的！