Question

当我尝试使用Retrofit从我的api获取数据时收到此错误消息：

W / MainActivity：onFailure客户端：预计BEGIN_ARRAY但是路径$
的BEGIN_OBJECT

我通读了几个主题，主要是说我制作了一个，但它仍然不起作用。

这是获取数据的方法

public void getClient() {
    callClient = service.client();
    callClient.enqueue(new Callback<List<ClientResponse>>() {
        @Override
        public void onResponse(Call<List<ClientResponse>> call, Response<List<ClientResponse>> response) {
            Log.w(TAG, "onResponse getClient: " + response );
            if(response.isSuccessful()) {
                Log.w(TAG, "getClient getData successful: " + response.body().get(0));
            } else {
                Log.w(TAG, "getClient not successful");
            }
        }
        @Override
        public void onFailure(Call<List<ClientResponse>> call, Throwable t) {
            Log.w(TAG, "onFailure client: " + t.getMessage() );
        }
    });
}

我的ApiService接口

public interface ApiService {
    ...
    @GET("client")
    Call<List<ClientResponse>> client();
    ...
}

My Client Model
public class Client {
    public int id;
    public String name;
    public String email;
    public String created_at;
    public String updated_at;

    public Client(int id, String name, String email, String created_at, String updated_at) {
        this.id = id;
        this.name = name;
        this.email = email;
        this.created_at = created_at;
        this.updated_at = updated_at;
    }

    public int getId() {
        return id;
    }
    public void setId(int id) {
        this.id = id;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public String getEmail() {
        return email;
    }
    public void setEmail(String email) {
        this.email = email;
    }
    public String getCreated_at() {
        return created_at;
    }
    public void setCreated_at(String created_at) {
        this.created_at = created_at;
    }
    public String getUpdated_at() {
        return updated_at;
    }
    public void setUpdated_at(String updated_at) {
        this.updated_at = updated_at;
    }
}

我的ClientResponse

public class ClientResponse {
    List<Client> data;
    public List<Client> getData() { return data; }
    public void setData(List<Client> data) { this.data = data; }
}

这是我当前的json输出的样子，我是从postman复制的：

{
    "data": {
        "id": 1,
        "name": "Mad Max",
        "email": "mad@max.com",
        "created_at": "2017-07-26 09:57:22",
        "updated_at": "2017-07-26 09:57:22"
    }
}

Answer 1

这意味着即将到来的回复为object，但您当前的回复是Array

您的回复List<ClientResponse>我觉得它应该是ClientResponse对象

public class ClientResponse {
    public Client data;
    public Client getData() { return data; }
    public void setData(Client data) { this.data = data; }
}

获取数据

public void getClient() {
    callClient = service.client();
    callClient.enqueue(new Callback<List<ClientResponse>>() {
        @Override
        public void onResponse(Call<List<ClientResponse>> call, Response<List<ClientResponse>> response) {
            if(response.isSuccessful()) {
                // first way to get data
                Client client =response.body().data;
                // second way but i dont prefer it .but you want it as per ou r 
                //discussion 
                response.body().setData(response.body().data);
                Client client =response.body().getData();

                // third way to get data
                ClientResponse clientResponse = response.body();
                Log.w(TAG, "getClient getData successful: " +
                    clientResponse.getData().getName());
            } else {
                Log.w(TAG, "getClient not successful");
            }
        }
        @Override
        public void onFailure(Call<List<ClientResponse>> call, Throwable t) {
            Log.w(TAG, "onFailure client: " + t.getMessage() );
        }
    });
}

Answer 2

我认为您可能应该将ApiService接口修改为

@GET("client")
Call<ClientResponse> client();

和ClientResponse应为

  public class ClientResponse {
     public Client data;
     public Client getData() { return data; }
        public void setData(Client data) { this.data = data; }
  }

Android Retrofit onFailure预计BEGIN_ARRAY但是BEGIN_OBJECT

2 个答案: