RETROFIT预期的begin_object，但在GET方法中是BEGIN_ARRAY

Question

我正在尝试通过改造获取一些数据，并且我遇到了此错误。我了解错误是什么，但我不知道如何解决：

com.google.gson.JsonSyntaxException: java.lang.IllegalStateException: Expected BEGIN_OBJECT but was BEGIN_ARRAY at line 1 column 2 path $

我试图在这里的其他问题中找到答案，但是我找不到类似我的问题的东西...

我的接口代码：

public interface ApiInterface {
    @GET("api/category")
    Call<Category> getBusinessCategory();
}

我要调用改造的班级代码：

private Call<Category> mCall;
  mCall = apiService.getBusinessCategory();
        mCall.enqueue(new Callback<Category>() {
            @Override
            public void onResponse(Call<Category> call, Response<Category> response) {
                if (response.isSuccess()) {
                    Log.e(TAG, response.toString());
                } else {
                    Toast.makeText(getApplication(), "No conexion", Toast.LENGTH_SHORT).show();
                }
            }
            @Override
            public void onFailure(Call<Category> call, Throwable t) {
                Log.e(TAG, t.toString());
            }
        });

这是JSON：

[
  {
    "id": 1,
    "name": "FOOD",
    "imageRef": "v1475594353/categories/a",
    "translate": null
  },
  {
    "id": 2,
    "name": "CAR",
    "imageRef": "v1475594195/categories/b",
    "translate": null
   }
]

类别类别：

public class Category  implements Serializable {
  @SerializedName("category")
    @Expose
    private final static String TAG = "Category";
    private String imageRef = "";
    private Long id;
    private String name;
    private String translate;
    private transient Bitmap image;
... Getters and setters

apiclient类

public class ApiClient {
    public static final String BASE_URL = "http://xxxxx/";
    private static Retrofit retrofit = null;

    public static Retrofit getClient() {
        if (retrofit==null) {
            retrofit = new Retrofit.Builder()
                    .baseUrl(BASE_URL)
                    .addConverterFactory(GsonConverterFactory.create())
                    .build();
        }
        return retrofit;
    }}

Answer 1

出现问题，因为您试图将数组分析到对象，更正后端实现或更改代码如下：

您的校正接口：

public interface ApiInterface {
@GET("api/category")
Call<List<Category>> getBusinessCategory(); }

和可变MCALL：

private Call<List<Category>> mCall;

Answer 2

在这里我编辑了您的代码：

public interface ApiInterface {
    @GET("api/category")
    Call<List<Category>> getBusinessCategory();
}

您的API返回数组，但您正在尝试将其施加到一个对象。

编辑：

  private Call<List<Category>> mCall;
  mCall = apiService.getBusinessCategory();
        mCall.enqueue(new Callback<List<Category>>() {
            @Override
            public void onResponse(Call<List<Category>> call, Response<List<Category>> response) {
                if (response.isSuccess()) {
                    Log.e(TAG, response.toString());
                } else {
                    Toast.makeText(getApplication(), "No conexion", Toast.LENGTH_SHORT).show();
                }
            }
            @Override
            public void onFailure(Call<List<Category>> call, Throwable t) {
                Log.e(TAG, t.toString());
            }
        });