Data is not being received using retrofit

Question

I am using a retrofit to get Json data but something is wrong. No data is being received.

The following is my model class

public class DataList {
@SerializedName("pariyojanaId")
    @Expose
    private Float pariyojanaId;
    @SerializedName("projectStatus")
    @Expose
    private String projectStatus;
    @SerializedName("heading")
    @Expose
    private String heading;
    @SerializedName("projectNumber")
    @Expose
    private Float projectNumber;
    @SerializedName("fieldTitle")
    @Expose
    private String fieldTitle;
    @SerializedName("targetedGroup")
    @Expose
    private String targetedGroup;

//Getter Setter
}

My interface

public interface PariyojanaInterface {
@GET("projectBudget/pariyojanaListForMobile")
Call<List<DataList>> getData(
        @Query("memberId") int id);
}

I have an API interface which is working. Below is my retrofit function.

 apiInterface = ApiClient.getApiClient().create(PariyojanaInterface.class);
    Call<List<DataList>> call = apiInterface.getData(id);
    Log.e("url", call.request().toString());
    call.enqueue(new Callback<List<DataList>>() {
        @Override
        public void onResponse(Call<List<DataList>> call, Response<List<DataList>> response) {
            Log.e("url", "hello");
            posts =  response.body();
            adapter = new PariyojanaAdapter(posts,getApplicationContext());
            recyclerView.setAdapter(adapter);

            adapter.notifyDataSetChanged();
        }

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

When i run this program, upto the line

Log.e("url", call.request().toString());

I am getting response but after that in line

call.enqueue(new Callback<List<DataList>>() {}

I think there is some problem. I am not able to run my program past this. Can anybody please help me.

Answer 1

you cant directly access the array without going through the outer object,you will need one more pojo class like this :

DataResponse.java

    public class DataResponse {

@SerializedName("data")
@Expose
private List<DataList> data = null;

public List<DataList> getData() {
return data;
}

public void setData(List<DataList> data) {
this.data = data;
}

}

Change all List<DataList> to DataResponse i.e, convert your network call like this :

apiInterface = ApiClient.getApiClient().create(PariyojanaInterface.class);
Call<DataResponse> call = apiInterface.getData(id);
Log.e("url", call.request().toString());
call.enqueue(new Callback<DataResponse>() {
    @Override
    public void onResponse(Call<DataResponse> call, Response<DataResponse> response) {
        Log.e("url", "hello");
        ArrayList<DataList> post_list =  new ArrayList<>(response.body().getData());
        adapter = new PariyojanaAdapter(post_list,getApplicationContext());
        recyclerView.setAdapter(adapter);

        adapter.notifyDataSetChanged();
    }

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

and change interface like this

    public interface PariyojanaInterface {
@GET("projectBudget/pariyojanaListForMobile")
Call<DataResponse> getData(
        @Query("memberId") int id);
}

As i have mentioned, your endpoint is returning an object, not an array. So specify an object as return params for your network callbacks

Answer 2

Try this flow

               try {
                    JSONObject jsonObject = new JSONObject(resultJSONResponse);

                    JSONArray jsonArray = jsonObject.getJSONArray("data");

                    for (int i = 0; i < jsonArray.length(); i++)
                    {
                        JSONObject o = jsonArray.getJSONObject(i);

                                strid = o.getString("pariyojanaId");
                                strstatus = o.getString("projectStatus");

                                showMethod();

                    }
                } catch (JSONException e) {
                    e.printStackTrace();
                }