使用Retrofit2解析API时获取null

时间:2018-01-20 14:51:18

标签: android json parsing retrofit2 api-design

直接在我的浏览器中输入(删除了appId)

  

http://api.openweathermap.org/data/2.5/weather?q=37421&appid=xxxx

我得到了这个预期的回应

  

{“coord”:{“lon”:73,“lat”:31.32},“weather”:[{“id”:800,“main”:“Clear”,“description”:“晴朗的天空” “图标”: “01N”}], “基”: “站”, “主”:{ “温度”:286.471, “压力”:1007.05, “湿度”:86, “temp_min”:286.471,“temp_max “:286.471,” sea_level “:1028.03,” grnd_level “:1007.05},” 风 “:{” 速度 “:3.01,” DEG “:252.003},” 云 “:{” 所有 “:0},” DT” :1516458282,“sys”:{“message”:0.0035,“country”:“PK”,“sunrise”:1516413964,“sunset”:1516451547},“id”:1179400,“name”:“Chak 247 RB Miani ”, “鳕鱼”:200}

我想要的只是纬度和经度坐标。

这是我的模特

public class CoordObject {
    private String lat;
    private String lon;

    public CoordObject(
            String lat,
            String lon({
        this.lat =lat;
        this.lon =lon;
    }

    public String getLat(){
        return lat;
    }
    public String getLon(){
        return lon;
    }
}

和我的界面

public interface OwmInterface {

@GET("/data/2.5/weather")
Call<CoordObject> getCoord(@Query("q") String zipCode,
                           @Query("appid") String appId);
}

和我的活动

 final String BASE_URL = "https://api.openweathermap.org/";
    final String API_KEY_OWM = "xxxx";

    Retrofit retrofit = new Retrofit.Builder()
            .baseUrl(BASE_URL)
            .addConverterFactory(GsonConverterFactory.create())
            .build();
    OwmInterface request = retrofit.create(OwmInterface.class);

    Call<CoordObject> call = request.getCoord(
            "37421",
            API_KEY_OWM
    );

    call.enqueue(new Callback<CoordObject>() {
        @Override
        public void onResponse(Call<CoordObject> call, Response<CoordObject> response){
            CoordObject coordObjectResponse = response.body();
            Toast.makeText(MainActivity.this, coordObjectResponse.getLat(), Toast.LENGTH_LONG).show();
            Toast.makeText(MainActivity.this, coordObjectResponse.getLon(), Toast.LENGTH_LONG).show();
        }

        @Override
        public void onFailure(Call<CoordObject> call, Throwable t) {
                Toast.makeText(MainActivity.this, "failed" +t, Toast.LENGTH_SHORT).show();
            }
    });

我得到了回复但是祝酒词显示为空。

1 个答案:

答案 0 :(得分:1)

根目录中有一个包含CoordObject的对象 您应该再创建一个类:

public class RootObject {

    private CoordObject coord;

    public RootObject(CoordObject coord){
        this.coord = coord
    }

    public CoordObject getCoordinates(){
        return coord;
    }
}

现在您的界面应该返回RootObject

@GET("/data/2.5/weather")
Call<RootObject> getCoord(@Query("q") String zipCode,
                           @Query("appid") String appId);

同时检查latlon是否来自double,而不是String