SimpleXML - как?

Question

Я пытался пару дней заставить SimpleXML работать с Retorfix и проанализировать xml-ответ NOAA.Данные поступают со следующего URL: https://www.aviationweather.gov/adds/dataserver_current/httpparam?dataSource=metars&requestType=retrieve&format=xml&hoursBeforeNow=1.5&stationString=KOJA

Я продолжаю получать сообщения об ошибках в поле METAR:

onFailure: NOAA: org.simpleframework.xml.core.ValueRequiredException: невозможноудовлетворить @ org.simpleframework.xml.Attribute (empty =, name =, required = true) в поле 'metar' private us.sensornet.aviationweatherapp.data.noaa.METAR us.sensornet.aviationweatherapp.data.noaa.Data.metar для класса us.sensornet.aviationweatherapp.data.noaa.Data в строке 9

Я попытался изменить тип поля с METAR на String и обратно.Я пробовал разные аннотации.Я не могу понять, в чем проблема.

Для краткости я перечислю здесь только те классы, которые мне важны:

package us.sensornet.aviationweatherapp.data.noaa;

import com.google.gson.annotations.Expose;
import com.google.gson.annotations.SerializedName;


public class Response {

@SerializedName("errors")
@Expose
private String errors;

@SerializedName("time_Taken_ms")
@Expose
private String time_taken_ms;

@SerializedName("Data_Source")
@Expose
private Data_source data_source;

@SerializedName("Request")
@Expose
private Request request;

@SerializedName("Request_Index")
@Expose
private String request_index;

@SerializedName("Data")
@Expose
private Data data;

@SerializedName("Warnings")
@Expose
private String warnings;

@SerializedName("version")
@Expose
private String version;

public Response() {
    /* Empty Constructor */
}

public String getErrors ()
{
    return errors;
}

public void setErrors (String errors)
{
    this.errors = errors;
}

public String getTime_taken_ms ()
{
    return time_taken_ms;
}

public void setTime_taken_ms (String time_taken_ms)
{
    this.time_taken_ms = time_taken_ms;
}

public Data_source getData_source ()
{
    return data_source;
}

public void setData_source (Data_source data_source)
{
    this.data_source = data_source;
}

public Request getRequest ()
{
    return request;
}

public void setRequest (Request request)
{
    this.request = request;
}

public String getRequest_index ()
{
    return request_index;
}

public void setRequest_index (String request_index)
{
    this.request_index = request_index;
}

public Data getData ()
{
    return data;
}

public void setData (Data data)
{
    this.data = data;
}

public String getWarnings ()
{
    return warnings;
}

public void setWarnings (String warnings)
{
    this.warnings = warnings;
}

public String getVersion ()
{
    return version;
}

public void setVersion (String version)
{
    this.version = version;
}

@Override
public String toString()
{
    return "ClassPojo [errors = "+errors+", time_taken_ms = "+time_taken_ms+", data_source = "+data_source+", request = "+request+", request_index = "+request_index+", data = "+data+", warnings = "+warnings+", version = "+version+"]";
}
}

Класс данных:

package us.sensornet.aviationweatherapp.data.noaa;

import com.google.gson.annotations.Expose;
import com.google.gson.annotations.SerializedName;

import org.simpleframework.xml.Attribute;

public class Data
{
@SerializedName("num_result")
@Expose
@Attribute(required = false)
private String num_results;

@SerializedName("METAR")
@Expose
@Attribute(required = true)
private METAR metar;

@SerializedName("meta")
@Expose
@Attribute(required = false)
private String meta;

public void setMeta(String meta) {
    this.meta = meta;
}

public String getMeta() {
    return meta;
}


public String getNum_results ()
{
    return num_results;
}

public void setNum_results (String num_results)
{
    this.num_results = num_results;
}

public METAR getMetar ()
{
    return metar;
}

public void setMETAR (METAR metar)
{
    this.metar = metar;
}

@Override
public String toString()
{
    return "ClassPojo [num_results = "+num_results+", metar = "+ metar +"]";
}
}   

Класс METAR:

package us.sensornet.aviationweatherapp.data.noaa;

import com.google.gson.annotations.Expose;
import com.google.gson.annotations.SerializedName;

public class METAR
{
@SerializedName("sea_level_pressure_mb")
@Expose
private String sea_level_pressure_mb;

@SerializedName("wind_dir_degrees")
@Expose
private String wind_dir_degrees;

@SerializedName("altim_in_hg")
@Expose
private String altim_in_hg;

@SerializedName("observation_time")
@Expose
private String observation_time;

@SerializedName("temp_c")
@Expose
private String temp_c;

@SerializedName("visibility_statute_mi")
@Expose
private String visibility_statute_mi;

@SerializedName("flight_category")
@Expose
private String flight_category;

@SerializedName("maxT_c")
@Expose
private String maxT_c;

@SerializedName("raw_text")
@Expose
private String raw_text;

@SerializedName("sky_condition")
@Expose
private Sky_condition[] sky_condition;

@SerializedName("minT_c")
@Expose
private String minT_c;

@SerializedName("dewpoint")
@Expose
private String dewpoint_c;

@SerializedName("metar_type")
@Expose
private String metar_type;

@SerializedName("wind_speed_kt")
@Expose
private String wind_speed_kt;

@SerializedName("three_hr_pressure_tendency_mb")
@Expose
private String three_hr_pressure_tendency_mb;

@SerializedName("longitude")
@Expose
private String longitude;

@SerializedName("latitude")
@Expose
private String latitude;

@SerializedName("station_id")
@Expose
private String station_id;

@SerializedName("elevation_m")
@Expose
private String elevation_m;

@SerializedName("quality_control_flags")
@Expose
private Quality_control_flags quality_control_flags;


public String getSea_level_pressure_mb ()
{
    return sea_level_pressure_mb;
}

public void setSea_level_pressure_mb (String sea_level_pressure_mb)
{
    this.sea_level_pressure_mb = sea_level_pressure_mb;
}

public String getWind_dir_degrees ()
{
    return wind_dir_degrees;
}

public void setWind_dir_degrees (String wind_dir_degrees)
{
    this.wind_dir_degrees = wind_dir_degrees;
}

public String getAltim_in_hg ()
{
    return altim_in_hg;
}

public void setAltim_in_hg (String altim_in_hg)
{
    this.altim_in_hg = altim_in_hg;
}

public String getObservation_time ()
{
    return observation_time;
}

public void setObservation_time (String observation_time)
{
    this.observation_time = observation_time;
}

public String getTemp_c ()
{
    return temp_c;
}

public void setTemp_c (String temp_c)
{
    this.temp_c = temp_c;
}

public String getVisibility_statute_mi ()
{
    return visibility_statute_mi;
}

public void setVisibility_statute_mi (String visibility_statute_mi)
{
    this.visibility_statute_mi = visibility_statute_mi;
}

public String getFlight_category ()
{
    return flight_category;
}

public void setFlight_category (String flight_category)
{
    this.flight_category = flight_category;
}

public String getMaxT_c ()
{
    return maxT_c;
}

public void setMaxT_c (String maxT_c)
{
    this.maxT_c = maxT_c;
}

public String getRaw_text ()
{
    return raw_text;
}

public void setRaw_text (String raw_text)
{
    this.raw_text = raw_text;
}

public Sky_condition[] getSky_condition ()
{
    return sky_condition;
}

public void setSky_condition (Sky_condition[] sky_condition)
{
    this.sky_condition = sky_condition;
}

public String getMinT_c ()
{
    return minT_c;
}

public void setMinT_c (String minT_c)
{
    this.minT_c = minT_c;
}

public String getDewpoint_c ()
{
    return dewpoint_c;
}

public void setDewpoint_c (String dewpoint_c)
{
    this.dewpoint_c = dewpoint_c;
}

public String getMetar_type ()
{
    return metar_type;
}

public void setMetar_type (String metar_type)
{
    this.metar_type = metar_type;
}

public String getWind_speed_kt ()
{
    return wind_speed_kt;
}

public void setWind_speed_kt (String wind_speed_kt)
{
    this.wind_speed_kt = wind_speed_kt;
}

public String getThree_hr_pressure_tendency_mb ()
{
    return three_hr_pressure_tendency_mb;
}

public void setThree_hr_pressure_tendency_mb (String three_hr_pressure_tendency_mb)
{
    this.three_hr_pressure_tendency_mb = three_hr_pressure_tendency_mb;
}

public String getLongitude ()
{
    return longitude;
}

public void setLongitude (String longitude)
{
    this.longitude = longitude;
}

public String getLatitude ()
{
    return latitude;
}

public void setLatitude (String latitude)
{
    this.latitude = latitude;
}

public String getStation_id ()
{
    return station_id;
}

public void setStation_id (String station_id)
{
    this.station_id = station_id;
}

public String getElevation_m ()
{
    return elevation_m;
}

public void setElevation_m (String elevation_m)
{
    this.elevation_m = elevation_m;
}

public Quality_control_flags getQuality_control_flags ()
{
    return quality_control_flags;
}

public void setQuality_control_flags (Quality_control_flags quality_control_flags)
{
    this.quality_control_flags = quality_control_flags;
}

@Override
public String toString()
{
    return "ClassPojo [sea_level_pressure_mb = "+sea_level_pressure_mb+", wind_dir_degrees = "+wind_dir_degrees+", altim_in_hg = "+altim_in_hg+", observation_time = "+observation_time+", temp_c = "+temp_c+", visibility_statute_mi = "+visibility_statute_mi+", flight_category = "+flight_category+", maxT_c = "+maxT_c+", raw_text = "+raw_text+", sky_condition = "+sky_condition+", minT_c = "+minT_c+", dewpoint_c = "+dewpoint_c+", metar_type = "+metar_type+", wind_speed_kt = "+wind_speed_kt+", three_hr_pressure_tendency_mb = "+three_hr_pressure_tendency_mb+", longitude = "+longitude+", latitude = "+latitude+", station_id = "+station_id+", elevation_m = "+elevation_m+", quality_control_flags = "+quality_control_flags+"]";
}
}

Класс NOAAWeather

package us.sensornet.aviationweatherapp.network.noaaweather;

import org.simpleframework.xml.convert.AnnotationStrategy;
import org.simpleframework.xml.core.Persister;

import okhttp3.OkHttpClient;
import okhttp3.logging.HttpLoggingInterceptor;
import retrofit2.Retrofit;
import retrofit2.converter.simplexml.SimpleXmlConverterFactory;

public class NOAAWeatherClient {
private static Retrofit retrofit = null;

public static Retrofit getClient(String baseUrl) {
   OkHttpClient.Builder OkHttpClient = new OkHttpClient.Builder();

   HttpLoggingInterceptor logging = new HttpLoggingInterceptor();
   logging.setLevel(HttpLoggingInterceptor.Level.BASIC);
   OkHttpClient.addInterceptor(logging);


    if (retrofit == null) {
        retrofit = new Retrofit.Builder()
                .baseUrl(baseUrl)
                .addConverterFactory(SimpleXmlConverterFactory.createNonStrict(
                        new Persister(new AnnotationStrategy())))
                .client(OkHttpClient.build())
                .build();
    }
    return retrofit;
}
}

Класс NOAAWeatherService

package us.sensornet.aviationweatherapp.network.noaaweather;

import retrofit2.Call;
import retrofit2.http.GET;
import retrofit2.http.Query;
import us.sensornet.aviationweatherapp.data.noaa.Response;

public interface NOAAWeatherService {
// dataSource=metars&requestType=retrieve&format=xml&hoursBeforeNow=1.5&stationString=KBIL

@GET("httpparam?dataSource=metars&requestType=retrieve&format=xml&hoursBeforeNow=1.5")
Call<Response> getMetar(@Query("stationString") String icao);

}

Класс ApiUtil

package us.sensornet.aviationweatherapp.network;

import us.sensornet.aviationweatherapp.network.avwx.AVWXClient;
import us.sensornet.aviationweatherapp.network.avwx.AVWXService;
import us.sensornet.aviationweatherapp.network.geocodexyz.GeoCodeXYZClient;
import us.sensornet.aviationweatherapp.network.geocodexyz.GeoCodeXYZService;
import us.sensornet.aviationweatherapp.network.noaaweather.NOAAWeatherClient;
import us.sensornet.aviationweatherapp.network.noaaweather.NOAAWeatherService;

public class ApiUtil {

public static final String BASE_URL = "https://avwx.rest/api/";
public static final String NOAA_BASE_URL = "https://www.aviationweather.gov/adds/dataserver_current/";
public static final String GEOCODE_BASE_URL = "https://geocode.xyz/";

public static AVWXService getAVWXService() {
    return AVWXClient.getClient(BASE_URL).create(AVWXService.class);
}

public static NOAAWeatherService getNOAAWeatherService() {
    return NOAAWeatherClient.getClient(NOAA_BASE_URL).create(NOAAWeatherService.class);
}

public static GeoCodeXYZService getGeoCodeService() {
    return GeoCodeXYZClient.getClient(GEOCODE_BASE_URL).create(GeoCodeXYZService.class);
}
}

Я включилURL для API с точным запросом, который я делаю.Я попытался включить это здесь, но я либо получаю ошибку форматирования, либо он вырывает теги xml.Так что перейдите по ссылке выше, и вы увидите точный ответ, который я получаю.Спасибо, что взглянули на это:

Я вижу несколько результатов METAR в результатах.Что-то, чего я не видел при тестировании API в браузере перед кодированием.Это может быть проблемой.Однако, пожалуйста, посмотрите на это и дайте мне знать, если есть другие проблемы.Я думаю, что я могу просто сделать список в модели данных? enter code here