如何在 retrofit 上实现这个？

Question

您好，我是一名 android 开发人员，在“预期 BEGIN_ARRAY 但在第 1 行第 2 列路径 $ 处是 BEGIN_OBJECT”之前我从未遇到过这个问题，我怀疑问题出在我的 model 中。

这是 postman 响应原样

{
  "Status": 200,
  "Message": "OK",
  "Data": {
    "ServiceTypes": [
      {
        "Id": 1,
        "ServiceTypeNameAr": "صيانة",
        "ServiceTypeNameEn": "Maintenance",
        "MainServices": [
          {
            "Id": 11,
            "ServiceTypeId": 1,
            "MainServiceNameAr": "تكييفات\r\n",
            "MainServiceNameEn": "Air conditioning\r\n",
            "SubServices": null
          },
          {
            "Id": 12,
            "ServiceTypeId": 1,
            "MainServiceNameAr": "كهرباء\r\n",
            "MainServiceNameEn": "Electricity\r\n",
            "SubServices": null
          },
          {
            "Id": 14,
            "ServiceTypeId": 1,
            "MainServiceNameAr": "سباكة",
            "MainServiceNameEn": "Plumbing\r\n",
            "SubServices": null
          },
          {
            "Id": 15,
            "ServiceTypeId": 1,
            "MainServiceNameAr": "اجهزة منزلية\r\n",
            "MainServiceNameEn": "Home appliances\r\n",
            "SubServices": null
          }
          
        ]
     }
      
    ]
    
  }
  
}

我想在我的代码中将其实现为 pojo(model) 这是我的尝试（已编辑）ResponseModel

public class ResponseModel {
    @SerializedName("Status")
    public int Status;
    @SerializedName("Message")
    public String Message;
    @SerializedName("Data")

    public DataModel Data;

    public int getStatus() {
        return Status;
    }

    public void setStatus(int status) {
        Status = status;
    }

    public String getMessage() {
        return Message;
    }

    public void setMessage(String message) {
        Message = message;
    }

    public DataModel getData() {
        return Data;
    }

    public void setData(DataModel data) {
        this.Data = data;
    }

}

数据模型

public class DataModel {
    @SerializedName("Country")
    private List<CountryModel> countryModels;
    @SerializedName("Users")
    private List<UserModel> users;
    @SerializedName("Cities")
    private List<CityItem> cityItems;
    @SerializedName("ServiceTypes")
    private List<ServiceTypeModel> serviceTypeModels;
    private Map<String, Object> additionalProperties = new HashMap<String,
                Object>();

    public List<CityItem> getCityItems() {
        return cityItems;
    }

    public void setCityItems(List<CityItem> cityItems) {
        this.cityItems = cityItems;
    }

    public List<UserModel> getUsers() {
        return users;
    }

    public void setUsers(ArrayList<UserModel> users) {
        this.users = users;
    }

    public List<CountryModel> getCountryModels() {
        return countryModels;
    }

    public void setCountryModels(ArrayList<CountryModel> countryModels) {
        this.countryModels = countryModels;
    }
    public List<ServiceTypeModel> getServiceTypeModels() {
        return serviceTypeModels;
    }

    public void setServiceTypeModels(List<ServiceTypeModel> serviceTypeModels) {
        this.serviceTypeModels = serviceTypeModels;
    }

    public void setCountryModels(List<CountryModel> countryModels) {
        this.countryModels = countryModels;
    }

    public void setUsers(List<UserModel> users) {
        this.users = users;
    }

    public Map<String, Object> getAdditionalProperties() {
        return additionalProperties;
    }

    public void setAdditionalProperties(Map<String, Object> additionalProperties) {
        this.additionalProperties = additionalProperties;
    }
}

服务类型模型

public class ServiceTypeModel {
    @SerializedName("Id")
    private int id;
    @SerializedName("ServiceTypeNameAr")
    private String serviceTypeNameAr;
    @SerializedName("ServiceTypeNameEn")
    private String serviceTypeNameEn;
    @SerializedName("MainServices")
    private List<MainServicesModel> mainServicesList;

    public List<MainServicesModel> getMainServicesList() {
        return mainServicesList;
    }

    public void setMainServicesList(List<MainServicesModel> mainServicesList) {
        this.mainServicesList = mainServicesList;
    }

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getServiceTypeNameAr() {
        return serviceTypeNameAr;
    }

    public void setServiceTypeNameAr(String serviceTypeNameAr) {
        this.serviceTypeNameAr = serviceTypeNameAr;
    }

    public String getServiceTypeNameEn() {
        return serviceTypeNameEn;
    }

    public void setServiceTypeNameEn(String serviceTypeNameEn) {
        this.serviceTypeNameEn = serviceTypeNameEn;
    }
}

界面：

public interface ServiceTypeInterface {

    @GET("ServiceType")
    public Call<ResponseModel> GetServicesType(@Header("authorization") String token);

    @GET("ServiceType/{id}")
    public Call<ResponseModel> GetServiceTypeById(@Path("id") int Id, @Header("authorization") String token);
}

适配器

public class ServiceTypeAdapter extends RecyclerView.Adapter<ServiceTypeAdapter.ServiceTypeHolder> {
    private List<ResponseModel> serviceTypeModels = new ArrayList<>();
    private final ServiceTypeListener listener;
    private Context context;

    public ServiceTypeAdapter(ServiceTypeListener listener, Context context, List<ResponseModel> serviceTypeList) {
        this.listener = listener;
        this.context = context;
        this.serviceTypeModels = serviceTypeList;
    }

    @NonNull
    @Override
    public ServiceTypeHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        View itemView = LayoutInflater.from(parent.getContext()).inflate(R.layout.item_sub_service, parent, false);
        return new ServiceTypeHolder(itemView);
    }

    @Override
    public void onBindViewHolder(@NonNull ServiceTypeHolder holder, int position) {
        final ResponseModel ServiceType = serviceTypeModels.get(position);
        holder.TxtServiceTypeName.setText(ServiceType.getData().getServiceTypeModels().get(0).getServiceTypeNameEn());
    }

    @Override
    public int getItemCount() {
        return serviceTypeModels.size();
    }

    public long getItemId(int position) {
        return position;
    }

    public void  setList(List<ResponseModel> serviceTypeModels) {
//        serviceTypeModels = new List<ResponseModel>(serviceTypeModels.get(0).getData().getServiceTypeModels().get(0).getServiceTypeNameEn());
        this.serviceTypeModels = serviceTypeModels;
        notifyDataSetChanged();
    }

    public class ServiceTypeHolder extends RecyclerView.ViewHolder {
        TextView TxtServiceTypeName;
        public ServiceTypeHolder(@NonNull View itemView) {
            super(itemView);
            TxtServiceTypeName = itemView.findViewById(R.id.ServiceTypeName);
            itemView.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                    listener.onServiceTypeSelected(serviceTypeModels.get(getAdapterPosition()));
                }
            });
        }
    }

    public interface ServiceTypeListener {
        void onServiceTypeSelected(ResponseModel serviceTypeModel);
    }
}

我试图将它们也分成两个模型，状态、消息和数据，它们调用另一个 model 中的服务类型。 如果需要任何其他或更多说明，请不要犹豫，向我索要代码或任何东西。 非常感谢任何帮助。 提前致谢。

Answer 1

你可以这样实现 pojo：

这个 class 代表顶级 object：

public class ResponseModel {
   private Integer Status;
   private String Message;
   private DataModel Data;

   // getters, setters, constructors
}

这个 class 代表数据 class：

public class DataModel {
    private List<ServiceTypeModel> ServiceTypes;

    // getters, setters, constructors
}

这个 class 映射到 ServiceTypes

public class ServiceTypeModel {
    private Long Id;
    private String ServiceTypeNameAr;
    private String ServiceTypeNameEn;
    private List<MainServiceModel> MainServices;

    // getters, setters, constructors
}

最后这个 class 映射到 MainServices

public class MainServiceModel{
    private Long Id;
    private Long ServiceTypeId;
    private String MainServiceNameAr;
    private String MainServiceNameEn;
    private List<SubServiceModel> SubServices;

    // getters, setters, constructors

}

对于SubServices ，您提供了 null 所以我想这是SubServiceModel的列表。 您可以像我为其他人所做的那样实现此 class。 您也可以使用一些在线工具来生成 json 的 pojo 像这样

Answer 2

我认为问题出在您的ServiceTypeWebEntity model 中，您将data设置为list ，但它是一个 object，其中有ServiceTypes键，其中包含List<ServiceTypeModel> ，所以您可以试试这个 Z20F35E630DAF44DBFA4CZ.F68F58C

public class ServiceTypeWebEntity {
    @SerializedName("Status")
    private int Status;
    @SerializedName("Message")
    private String Message;
    @SerializedName("data")
    public ServiceTypes ServicesType;

    public int getStatus() {
        return Status;
    }

    public void setStatus(int status) {
        Status = status;
    }

    public String getMessage() {
        return Message;
    }

    public void setMessage(String message) {
        Message = message;
    }

    public ServiceTypes getServicesType() {
        return ServicesType;
    }

    public void setServicesType(ServiceTypes servicesType) {
        ServicesType = servicesType;
    }

 public class ServiceTypes{
       
    @SerializedName("ServiceTypes")
     public List<ServiceTypeModel> ServicesType;
      
   public List<ServiceTypeModel> getServicesType() {
        return ServicesType;
    }

    public void setServicesType(List<ServiceTypeModel> servicesType) {
        ServicesType = servicesType;
    }
    }
    
    public class ServiceTypeModel {
        @SerializedName("Id")
        private int id;
        @SerializedName("ServiceTypeNameAr")
        private String serviceTypeNameAr;
        @SerializedName("ServiceTypeNameEn")
        private String serviceTypeNameEn;
        @SerializedName("MainServices")
        private List<MainServicesModel> mainServicesList;

        public List<MainServicesModel> getMainServicesList() {
            return mainServicesList;
        }

        public void setMainServicesList(List<MainServicesModel> mainServicesList) {
            this.mainServicesList = mainServicesList;
        }

        public int getId() {
            return id;
        }

        public void setId(int id) {
            this.id = id;
        }

        public String getServiceTypeNameAr() {
            return serviceTypeNameAr;
        }

        public void setServiceTypeNameAr(String serviceTypeNameAr) {
            this.serviceTypeNameAr = serviceTypeNameAr;
        }

        public String getServiceTypeNameEn() {
            return serviceTypeNameEn;
        }

        public void setServiceTypeNameEn(String serviceTypeNameEn) {
            this.serviceTypeNameEn = serviceTypeNameEn;
        }
    }
}

希望能帮助到你。

Answer 3

我知道我错在哪里我在我的主要部分中遗漏了一小部分来调用列表本身这里是任何需要它的人或面临相同问题的人的主要部分

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_categories);
//
        TestTxt = findViewById(R.id.TestTxt);
        serviceTypeViewModel = ViewModelProviders.of(this).get(ServiceTypeViewModel.class);
        serviceTypeViewModel.GetServiceType();
        serviceTypeRecycler = findViewById(R.id.ServiceTypeRV);
//        LinearLayoutManager layoutManager = new LinearLayoutManager(this, LinearLayoutManager.HORIZONTAL, false);
//        serviceTypeRecycler.setLayoutManager(layoutManager);
//        serviceTypeRecycler.setItemAnimator(new DefaultItemAnimator());
//        serviceTypeRecycler.setAdapter(serviceTypeAdapter);
        FillListServices();

    }

    private void FillListServices() {
        serviceTypeViewModel.ServiceTypeMutableLiveData.observe(this, new Observer<ResponseModel>() {
//          Here i was trying to call the ServiceTypeModel instead
            @Override
            public void onChanged(ResponseModel responseModel) {
                Utilities.dismissLoadingDialog();

                serviceTypeModelArrayList = new ArrayList<>();
                serviceTypeModelArrayList = responseModel.getData().getServiceTypeModels();
                TestTxt.setText(responseModel.getData().getServiceTypeModels().get(0).getServiceTypeNameAr());
                serviceTypeAdapter = new ServiceTypeAdapter(responseModel.getData().getServiceTypeModels());
                LinearLayoutManager layoutManager = new LinearLayoutManager(MainCategories.this, LinearLayoutManager.HORIZONTAL, false);

                serviceTypeRecycler.setLayoutManager(layoutManager);
                serviceTypeRecycler.setAdapter(serviceTypeAdapter);

            }
        });
    }