在 android 中处理网络请求响应

Question

我创建了一个 android 应用程序来使用 Volley API 处理网络请求。 我已经设法从服务器获得响应，但是我无法遍历结果 JSON 的不同对象，当我将数据添加到 Listview 时，它只给了我应用程序的 package 名称，并在末尾添加了一个数字。

这是我要处理的响应。

{
    "list": [
        {
            "dt": 1637172000,
            "main": {
                "temp": 301.79,
                "feels_like": 300.34,
                "temp_min": 298.24,
                "temp_max": 301.79,
                "pressure": 1008,
                "sea_level": 1008,
                "grnd_level": 854,
                "humidity": 20,
                "temp_kf": 3.55
            },
            "weather": [
                {
                    "id": 800,
                    "main": "Clear",
                    "description": "clear sky",
                    "icon": "01n"
                }
            ],
            "clouds": {
                "all": 7
            },
            "wind": {
                "speed": 3.77,
                "deg": 46,
                "gust": 8.98
            },
            "visibility": 10000,
            "pop": 0,
            "sys": {
                "pod": "n"
            },
            "dt_txt": "2021-11-17 18:00:00"
        }
    ]
}

object model及其字段

public class WeatherReportModel {

    private int dt;
    private JSONObject main;
    private JSONArray weather;
    private JSONObject clouds;
    private JSONObject wind;
    private int visibility;
    private double pop;
    private JSONObject sys;
    private String dt_txt;

    public WeatherReportModel(
            int dt, 
            JSONObject main, 
            JSONArray weather, 
            JSONObject clouds, 
            JSONObject wind, 
            int visibility, 
            double pop, 
            JSONObject sys, 
            String dt_txt) {
        this.dt = dt;
        this.main = main;
        this.weather = weather;
        this.clouds = clouds;
        this.wind = wind;
        this.visibility = visibility;
        this.pop = pop;
        this.sys = sys;
        this.dt_txt = dt_txt;
    }
}

这是回调 function 获取响应并添加到模型的 object

public void getWeather(VolleyResponseListener forecast) {

        List<WeatherReportModel> weatherReportModels = new ArrayList<>();

        JsonObjectRequest request = new JsonObjectRequest(Request.Method.GET, url, null,
                new Response.Listener<JSONObject>() {
                    @Override
                    public void onResponse(JSONObject response) {

                        try {
                            JSONArray weather_list = response.getJSONArray("list");

                            // get the first item


                            for (int i = 0; i < weather_list.length(); i++) {

                                WeatherReportModel one_day_weather = new WeatherReportModel();

                                JSONObject first_day_from_api = (JSONObject) weather_list.get(i);

                                one_day_weather.setDt(first_day_from_api.getInt("dt"));
                                one_day_weather.setMain(first_day_from_api.getJSONObject("main"));
                                one_day_weather.setWeather(first_day_from_api.getJSONArray("weather"));
                                one_day_weather.setClouds(first_day_from_api.getJSONObject("clouds"));
                                one_day_weather.setWind(first_day_from_api.getJSONObject("wind"));
                                one_day_weather.setVisibility(first_day_from_api.getInt("visibility"));
                                one_day_weather.setPop(first_day_from_api.getLong("pop"));
                                one_day_weather.setSys(first_day_from_api.getJSONObject("sys"));
                                one_day_weather.setDt_txt(first_day_from_api.getString("dt_txt"));

                                weatherReportModels.add(one_day_weather);
                            }

                            forecast.onResponse(weatherReportModels);
                        } catch (JSONException e) {
                            e.printStackTrace();
                        }

                    }
                },
                new Response.ErrorListener() {
                    @Override
                    public void onErrorResponse(VolleyError error) {

                    }
                });

        //get the property call consolidated weather

        MySingleton.getInstance(context).addToRequestQueue(request);
    }

Answer 1

通常，ArrayAdapter 这样使用时会尝试使用 toString() function 来获取值并显示它。 尝试覆盖WeatherReportModel中的 toString 并重试。