java如何使用JSON显示天气数据？

Question

基本上，我为天气应用程序设计了UI/UX，设置了一个远程应用程序 用于从OpenWeatherMap API获取数据的it连接类：

RemoteFetch。java:

 import 安卓.content.Context;
 
 import 安卓x.appcompat.app.AppCompatActivity;
 
 import org.json.JSONObject;
 
 import java.io.BufferedReader;
 import java.io.InputStreamReader;
 import java.net.HttpURLConnection;
 import java.net.URL;
 
 public class RemoteFetch extends AppCompatActivity {
 
     private static final String OPEN_WEATHER_MAP_API =
             "https://api.openweathermap.org/data/2.5/onecall?lat=9.0765&lon=7.3986&exclude=daily&appid=";
 
     public static JSONObject getJSON(Context context, String city){
         try {
             URL url = new URL(String.format(OPEN_WEATHER_MAP_API, city));
             HttpURLConnection connection =
                     (HttpURLConnection)url.openConnection();
 
             connection.addRequestProperty("x-api-key",
                     context.getString(R.string.open_weather_maps_app_id));
 
             BufferedReader reader = new BufferedReader(
                     new InputStreamReader(connection.getInputStream()));
 
             StringBuilder json = new StringBuilder(1024);
             String tmp;
             while((tmp=reader.readLine())!=null)
                 json.append(tmp).append("\n");
             reader.close();
 
             JSONObject data = new JSONObject(json.toString());
 
             // This value will be 404 if the request was not
             // successful
             if(data.getInt("cod") != 200){
                 return null;
             }
 
             return data;
         }catch(Exception e){
             return null;
         }
     }
 }

为内部的RemoteFetch类创建了一个thread来调用getJSON 如果getJSON返回的值为null， 应向用户显示一条错误消息：

 private void updateWeatherData(final String city) {
     new Thread(){
         public void run(){
             final JSONObject json = RemoteFetch.getJSON(getActivity(), city);
             if(json == null){
                 handler.post(new Runnable(){
                     public void run(){
                         Toast.makeText(getActivity(),
                                 getActivity().getString(R.string.place_not_found),
                                 Toast.LENGTH_LONG).show();
                     }
                 });
             } else {
                 handler.post(new Runnable(){
                     public void run(){
                         renderWeather(json);
                     }

如果不是，则应调用renderWeather方法。这个 renderWeather方法使用JSON数据更新TextView 我在片段类中设置的对象：

 private void renderWeather(JSONObject json){
                         try {
                             cityField.setText(json.getString("name").toUpperCase(Locale.US)) +
                                     ", " +
                                     json.getJSONObject("sys").getString("country");
                             JSONObject details = json.getJSONArray("Weather").getJSONObject(0);
                             JSONObject main = json.getJSONObject("main");
                             detailsfield.setText(
                                     details.getString("description").toUpperCase(Locale.US) +
                                             "\n" + "Humidity: " + main.getString("humidity") + "%" +
                                             "\n" + "Pressure: " + main.getString("pressure") + " hpa");
 
                             current_temp.setText(
                                     String.format("%.2f", main.getDouble("temp")) + " \\u2103");
 
                             DateFormat df = DateFormat.getDateTimeInstance();
                             String updatedOn = df.format(new Date(json.getLong("dt") * 1000));
                             updatedField.setText("Last update: " + updatedOn);
 
                             setcurrent_output(details.getInt("id"),
                                     json.getJSONObject("sys").getLong("sunrise") * 1000,
                                     json.getJSONObject("sys").getLong("sunset") * 1000);
 
                         }catch (Exception e){
                             Log.e("lightweatherforcast", "One or more fields not found in this JSON data");
 
 
 
                         }
                     }
                 });
             }
         }
     }.start();
 }

现在问题就出在这里，因为我从中学到的教程使用它来匹配他们的应用程序UI，但我的应用程序是不同的，而且 包含我需要从设置中添加的更多详细信息，我已尝试 有这么多的方法一直在匹配我的应用程序界面，但都没有成功

到目前为止，通过天气设置，一切正常，只有 问题在于renderWeather方法。我试图用JSON来 当前在以下TextViews中显示天气数据：

 *`User city(cityField)`,
 *`Current time(Updated Field)`
 *`Current Temperature(current_temp)`
 *`Condition of the current temperature(current_output)`
 *`Tomorrow Temperature(small_temp1)`
 *`Condition of tomorrow's temperature(small_icon1)`
 *`Next tomorrow's temperature(small_temp2)`
 *`Condition of Next tomorrow's temperature(small_icon2)`
 *`Sunrise time(rise_time)`
 *`Sunset set(set_time)`

天气情况小组：

 *`Temperature(temp_out)`
 *`Pressure(press_out)`
 *`Humidity(Humid_out)`
 *`Wind Speed(Ws_out)`
 *`Visibility(Visi_out)`
 *`UV index(UV_out)`

进程已完成，退出代码为0

这就是JSON响应的样子（格式化为可读性）：

{
   "lat":9.08,
   "lon":7.4,
   "timezone":"Africa/Lagos",
   "timezone_offset":3600,
   "current":{
      "dt":1608984165,
      "sunrise":1608961391,
      "sunset":1609003132,
      "temp":305.15,
      "feels_like":303.24,
      "pressure":1012,
      "humidity":25,
      "dew_point":282.68,
      "uvi":8.87,
      "clouds":35,
      "visibility":5000,
      "wind_speed":2.6,
      "wind_deg":150,
      "weather":[
         {
            "id":721,
            "main":"Haze",
            "description":"haze",
            "icon":"50d"
         }
      ]
   }
}

Answer 1

这似乎是一个重复我留下的链接的链接，你可能会发现有用的下面

但作为一个简单的答案，你可以用文本来表示这些天气数据，就像上面那个问题所回答的那样，然后你可以选择在你想要的UI中设置放置位置的选项。 JSON格式将非常简单：

city: {
id: 2643743,   //City ID, You may find more about these at https://openweathermap.org/find?q=
name: "London", //City Name, Just the name of your city
coord: {
lon: -0.12574,//These are coordinates for the city, Find them at google maps
lat: 51.50853
},
country: "GB", //Country names, GB here stands for United Kingdom, learn more at https://sustainablesources.com/resources/country-abbreviations/
population: 0 //Country Population
},
cod: "200",
message: 0.0268,
cnt: 5,
list: [
{
dt: 1448535600,
temp: { //Average Temperature at these times of the day (Current data is for london)
day: 8.58,
min: 8.58,
max: 9.18,
night: 9.18,
eve: 8.58,
morn: 8.58
},  //This is average temperature properties
pressure: 1025.14,
humidity: 95,
weather: [
{//Average Rain (Properties & Probabilities)
id: 500,
main: "Rain",
description: "light rain",
icon: "10d"
}
],
speed: 3.67,
deg: 224,
clouds: 92,
rain: 0.35
},
{},
{},
{},
{}
]

您可以通过以下方式访问这些数据：-

JSONObject forecastJson = new JSONObject(jsonString);
JSONArray forecastArray = forecastJson.getJSONArray("list");
double minTemp, maxTemp;
for(int i = 0; i < forecastArray.length(); i++) {
    JSONObject dailyForecast = forecastArray.getJSONObject(i);
    JSONObject tempObject = dailyForecast.getJSONObject("temp");
    minTemp = tempObject.getDouble("min");
    maxTemp = tempObject.getDouble("max");
    //add these minTemp and maxTemp to array or the 
   //way you want to use
}

如果你觉得我的答案奇怪、难以理解或难以理解，你可以查看我在下面嵌入的问题。谢谢 [1] ：How to retrieve weather data in json [android]