适配器支架中未返回数据

Question

我正在使用改造来呼叫数据。以下是我的情话

public class DataList {
@SerializedName("pariyojanaId")
@Expose
private Integer pariyojanaId;

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

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

@SerializedName("projectNumber")
@Expose
private Integer projectNumber;

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

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

//getter setter
}

以下是我的改造课程

pariyojanaInterfaces = ApiClient.getApiClient().create(PariyojanaInterface.class);
    Call<DataList> call = pariyojanaInterfaces.getData(memberId);
    Log.e("urll",call.request().toString());

    call.enqueue(new Callback<DataList>() {
        @Override
        public void onResponse(Call<DataList> call, Response<DataList> response) {
            datas = Collections.singletonList(response.body());
            ItemListAdapter itemListAdapter = new ItemListAdapter(context, datas);
            holder.rv.setLayoutManager(new LinearLayoutManager(context));
            holder.rv.setAdapter(itemListAdapter);
        }

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

正在设置我的适配器，但是设置的值为null。以下是我的适配器类的bindView持有人

 public void onBindViewHolder(ListViewHolder holder, int position) {

    datas = dataList.get(position);
    //Log.e("datasss", datas + "");
    holder.txtPariyojanaId.setText(String.valueOf(datas.getPariyojanaId()));
    holder.txtProjectStatus.setText(String.valueOf(datas.getProjectStatus()));
    holder.txtHeading.setText(String.valueOf(datas.getHeading()));
    holder.txtFieldTitle.setText(datas.getFieldTitle());
    holder.txtTargetedGroup.setText(datas.getTargetedGroup());
    Log.e("datahead","" + datas.getHeading() );

}

当我打印日志时，正在打印的数据为空。我不认为我的pojo有任何问题，并且url中也有数据。有人可以帮我解决这个问题吗？我不知道为什么我会变空。