这是后端团队将数组更改为对象时遇到的常见错误。

问题是在您的模型类（pojo类）中的某个地方，您被声明为一个数组，但实际上它是对象（反之亦然）。

你使用的响应不正确，需要这样纠正

示例json响应

{
  "category": [
    {
      "categoryID": 5,
      "categoryName": "Name",
      "categoryImage": "path",
      "categoryProductCount": 0,
      "hasSubCategory": false  
    },
{
    "categoryID": 5,
    "categoryName": "Name",
    "categoryImage": "path",
    "categoryProductCount": 0,
    "hasSubCategory": false
    }
  ]
}

现在你应该在接口中使用的POJO类

public class MyPojo
{
    private List<Category> category;

    public List<Category>  getCategory ()
    {
        return category;
    }

    public void setCategory (List<Category> category)
    {
        this.category = category;
    }


}

其中类别类是

public class Category
{
    private String categoryImage;

    private String hasSubCategory;

    private String categoryName;

    private String categoryID;

    private String categoryProductCount;

    public String getCategoryImage ()
    {
        return categoryImage;
    }

    public void setCategoryImage (String categoryImage)
    {
        this.categoryImage = categoryImage;
    }

    public String getHasSubCategory ()
    {
        return hasSubCategory;
    }

    public void setHasSubCategory (String hasSubCategory)
    {
        this.hasSubCategory = hasSubCategory;
    }

    public String getCategoryName ()
    {
        return categoryName;
    }

    public void setCategoryName (String categoryName)
    {
        this.categoryName = categoryName;
    }

    public String getCategoryID ()
    {
        return categoryID;
    }

    public void setCategoryID (String categoryID)
    {
        this.categoryID = categoryID;
    }

    public String getCategoryProductCount ()
    {
        return categoryProductCount;
    }

    public void setCategoryProductCount (String categoryProductCount)
    {
        this.categoryProductCount = categoryProductCount;
    }

  }

**Usage**

public interface ApiInterface {
    @GET("/categories/0")
    Call<MyPojo> getCategoryList();
}

在片段类别片段类

public class CategoriesFragment extends Fragment {

    RecyclerView mRecyclerView;
    List<Category> categoryList;
    Category category;

    public CategoriesFragment() {
        // Required empty public constructor
    }
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        if (getArguments() != null) {
            mParam1 = getArguments().getString(ARG_PARAM1);
            mParam2 = getArguments().getString(ARG_PARAM2);

        }

    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        View view = inflater.inflate(R.layout.fragment_categories, container, false);
        mRecyclerView = view.findViewById(R.id.recyclerview);
        GridLayoutManager mGridLayoutManager = new GridLayoutManager(getActivity(), 2);
        mRecyclerView.setLayoutManager(mGridLayoutManager);

        ApiInterface apiInterface = ApiClient.getRetrofitInstance().create(ApiInterface.class);
        Call<MyPojo> call = apiInterface.getCategoryList();
        call.enqueue(new Callback<MyPojo>() {
            @Override
            public void onResponse(Call<MyPojo> call, Response<MyPojo> response) {
                if (response.isSuccessful()) {
                    categoryList = response.body().getCategory ();
                     CategoryAdapter myAdapter = new CategoryAdapter(getActivity(), categoryList);
                          mRecyclerView.setAdapter(new CategoryAdapter(category, R.layout.category_item_view, ));
                    // mRecyclerView.setAdapter(myAdapter);
                }
                else
                  //  ApiErrorUtils.parseError(response);
                  Log.d("Api hata", "");
            }

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

        return view;
    }



     // TODO: Rename method, update argument and hook method into UI event
        public void onButtonPressed(Uri uri) {
            if (mListener != null) {
                mListener.onFragmentInteraction(uri);
            }
        }
    @Override
    public void onAttach(Context context) {
        super.onAttach(context);
        if (context instanceof OnFragmentInteractionListener) {
            mListener = (OnFragmentInteractionListener) context;
        } else {
//            throw new RuntimeException(context.toString()
  //                  + " must implement OnFragmentInteractionListener");
        }
    }

    @Override
    public void onDetach() {
        super.onDetach();
        mListener = null;
    }


    public interface OnFragmentInteractionListener {
        // TODO: Update argument type and name
        void onFragmentInteraction(Uri uri);
    }
}