在Retrofit2中使用带有对象数组的json

Question

I have this json I want to consume using the retrofit only that is not working very well

{
"point_period_data": [
    [
        {
            "sys_point_id": "60",
            "sys_point_registration": "12345678",
            "sys_point_day": "21",
            "sys_point_month": "12",
            "sys_point_year": "18",
            "sys_point_hour": "08",
            "sys_point_minute": "05",
            "sys_point_geo_lat": "-5.0787026",
            "sys_point_geo_long": "-42.8044331",
            "sys_point_status": "Falta",
            "sys_point_reference_code": "dc4e6ff10a"
        },
        {
            "sys_point_id": "61",
            "sys_point_registration": "12345678",
            "sys_point_day": "21",
            "sys_point_month": "12",
            "sys_point_year": "18",
            "sys_point_hour": "17",
            "sys_point_minute": "28",
            "sys_point_geo_lat": "-5.0787569",
            "sys_point_geo_long": "-42.804378",
            "sys_point_status": "Falta",
            "sys_point_reference_code": "b11a829fda"
        },
        {
            "sys_point_id": "62",
            "sys_point_registration": "12345678",
            "sys_point_day": "21",
            "sys_point_month": "12",
            "sys_point_year": "18",
            "sys_point_hour": "17",
            "sys_point_minute": "28",
            "sys_point_geo_lat": "-5.0787571",
            "sys_point_geo_long": "-42.8043877",
            "sys_point_status": "Falta",
            "sys_point_reference_code": "a330347242"
        }
    ],
    [
        {
            "sys_point_id": "84",
            "sys_point_registration": "12345678",
            "sys_point_day": "22",
            "sys_point_month": "12",
            "sys_point_year": "18",
            "sys_point_hour": "02",
            "sys_point_minute": "59",
            "sys_point_geo_lat": "-5.0788858",
            "sys_point_geo_long": "-42.8043689",
            "sys_point_status": "Presença",
            "sys_point_reference_code": "22f1d178ef"
        }
    ]
]
}

My interface is this way

@FormUrlEncoded
@POST("point/list/")
Call<List<List<Value>>> listPointPeriod(@Field("token") String token,
                                  @Field("registration") String registration,
                                  @Field("from_date") String from_date,
                                  @Field("to_date") String to_date);

This is called

Call<List<List<Value>>> callPonto = api.listPontoPeriod(token, resultFuncionario.get(i).getOfficials_registration(), dtInicio, dtFim);
callPonto.enqueue(new Callback<List<List<Value>>>() {
    @Override
    public void onResponse(Call<List<List<Value>>> call, Response<List<List<Value>>> response) {
        Gson gson = new Gson();
        Type collectionType = new TypeToken<List<List<Ponto>>>(){}.getType();
        List<Ponto> ponto = gson.fromJson(response.body().get(0).toString(), collectionType);   }

    @Override
    public void onFailure(Call<List<List<Value>>> call, Throwable t) {
       Log.d("error", t.getMessage());
    }
});

Model Ponto

public class Ponto {

    String sys_point_id, sys_point_registration, sys_point_day, sys_point_month, sys_point_year, sys_point_hour, sys_point_minute,
        sys_point_geo_lat, sys_point_geo_long, sys_point_status, sys_point_reference_code;

    public Ponto(String sys_point_id, String sys_point_registration, String sys_point_day, String sys_point_month, String sys_point_year, String sys_point_hour, String sys_point_minute, String sys_point_geo_lat, String sys_point_geo_long, String sys_point_status, String sys_point_reference_code) {
        this.sys_point_id = sys_point_id;
        this.sys_point_registration = sys_point_registration;
        this.sys_point_day = sys_point_day;
        this.sys_point_month = sys_point_month;
        this.sys_point_year = sys_point_year;
        this.sys_point_hour = sys_point_hour;
        this.sys_point_minute = sys_point_minute;
        this.sys_point_geo_lat = sys_point_geo_lat;
        this.sys_point_geo_long = sys_point_geo_long;
        this.sys_point_status = sys_point_status;
        this.sys_point_reference_code = sys_point_reference_code;
    }

    public Ponto(){

    }

    public String getSys_point_id() {
        return sys_point_id;
    }

    public String getSys_point_registration() {
        return sys_point_registration;
    }

    public String getSys_point_day() {
        return sys_point_day;
    }

    public String getSys_point_month() {
        return sys_point_month;
    }

    public String getSys_point_year() {
        return sys_point_year;
    }

    public String getSys_point_hour() {
        return sys_point_hour;
    }

    public String getSys_point_minute() {
        return sys_point_minute;
    }

    public String getSys_point_geo_lat() {
        return sys_point_geo_lat;
    }

    public String getSys_point_geo_long() {
        return sys_point_geo_long;
    }

    public String getSys_point_status() {
        return sys_point_status;
    }

    public String getSys_point_reference_code() {
        return sys_point_reference_code;
    }
}

my value class

public class Value {List<Ponto> point_period_data;public List<Ponto>getPointPeriod() {return point_period_data}}

As you saw above my code, I am trying to consume this json, I tried in several ways this was the last one I tried. If someone has already had it and have some answer to solve this problem please let me know.

Answer 1

I can see two main issues in the code you provided:

1. The return type of your Retrofit method is wrong

Call<List<List<Value>>> listPointPeriod

With this, you are expecting a List of List in the Json of your HTTP response. However, the JSON you provided is an object with the "point_period_data" attribute (which is a List of List).

2. You're mixing two methods of parsing the body of your HTTP response

When using Retrofit, the most usual way to parse the body of your response is to use a "converter". In your case, you seem to be using Gson and should have a look to https://github.com/square/retrofit/tree/master/retrofit-converters/gson
The official documentation also shows how to add a Converter: https://square.github.io/retrofit/#restadapter-configuration

If you correctly configure Gson with Retrofit, you won't need to manually parse the result in onResponse

A corrected version would be something like:

public class Value {
    List<List<Ponto>> point_period_data;

    public List<List<Ponto>> getPointPeriodData() {
        return point_period_data;
    }
}

@FormUrlEncoded
@POST("point/list/")
Call<Value> listPointPeriod(@Field("token") String token,
                                  @Field("registration") String registration,
                                  @Field("from_date") String from_date,
                                  @Field("to_date") String to_date);

Call<Value> callPonto = api.listPontoPeriod(token, resultFuncionario.get(i).getOfficials_registration(), dtInicio, dtFim);
            callPonto.enqueue(new Callback<Value>() {
                @Override
                public void onResponse(Call<Value> call, Response<Value> response) {
                    // Check response.isSuccessful and use response.body
                }

                @Override
                public void onFailure(Call<List<List<Value>>> call, Throwable t) {
                   Log.d("error", t.getMessage());
                }
            });