Question

冒着11次问这个问题的风险，我遇到问题处理来自POST请求的响应。并且无法找到stackoverflow的任何示例。

我向我的后端发出一个简单的请求，它返回一个 json对象数组。

我得到的错误是。点。

Expected BEGIN_ARRAY but was BEGIN_OBJECT at line 1 column 2 path $

这正是我正在做的事情

WebAPIService.class

@Headers("Content-Type: application/json")
@POST("pendingTransfers")
Call<List<VehicleTransferData>> refreshVehicles(@Body VehicleTransferData msg);

活动

public void refreshCars(View view) {

    Retrofit retrofit = new Retrofit.Builder()
            .baseUrl(TRANSFER_API)
            .addConverterFactory(GsonConverterFactory.create())
            .build();

    WebAPIService client = retrofit.create(WebAPIService.class);

    setTestData();

    Call<List<VehicleTransferData>> call = client.refreshVehicles(vtData);

    call.enqueue(new Callback<List<VehicleTransferData>>()
    {
        @Override
        public void onResponse(Call<List<VehicleTransferData>> call, Response<List<VehicleTransferData>> response) {

            Toast.makeText(RegisteredVehicles.this, response.body().get(0).getVehicleReg(),Toast.LENGTH_LONG).show();
        }

        @Override
        public void onFailure(Call<List<VehicleTransferData>> call, Throwable t) {
            Toast.makeText(RegisteredVehicles.this, t.getMessage(),Toast.LENGTH_LONG).show();
        }
    });

}

从服务器响应数据

{ResponseCode=200, ResponseMessage=ok, ApiVersion=v1, ResponsePackage=[
  {
    "transferUUID":"TRANSFER-UUID-5678-0000-567812345678",
    "vehicleUUID":"0VEHICLE-UUID-5678-0000-567812345678",
    "vehicleRegUUID":"VEHICLER-UUID-5678-0000-567812345678",
    "vehicleReg":"j107",
    "status":"pending",
    "transferDate":"2099-12-3",
    "seller":{
      "personUUID":"00SELLER-UUID-5678-0000-567812345678",
      "signature":"%3FR%3FD%3FV%3F%344DX54F%3F%3F%3F%3F%3F%3FBOOT-INF%2Flib%2FasmPK%0D%0A",
      "mileage":39993,"timestamp":"2099-12-31T23:59:59"
    },
    "buyer":{
      "personUUID":"000BUYER-UUID-5678-0000-567812345678",
      "signature":"Alfred Schmidt",
      "mileage":3993,
      "timestamp":"time"
    }
  }
]}

Answer 1

如果真的是服务器的响应，那么你需要创建一个如下所示的类：

class VehicleResponse{
    int ResponseCode;
    string ResponseMessage;
    string ApiVersion;
    List<VehicleTransferData> ResponsePackage;
}

API：

@Headers("Content-Type: application/json")
@POST("pendingTransfers")
Call<VehicleResponse> refreshVehicles(@Body VehicleTransferData msg);

的活动：

call.enqueue(new Callback<VehicleResponse>()
    {
        @Override
        public void onResponse(Call<VehicleResponse> call, Response<VehicleResponse> response) {

            Toast.makeText(RegisteredVehicles.this, response.body().get(0).getVehicleReg(),Toast.LENGTH_LONG).show();
        }

        @Override
        public void onFailure(Call<VehicleResponse> call, Throwable t) {
            Toast.makeText(RegisteredVehicles.this, t.getMessage(),Toast.LENGTH_LONG).show();
        }
    });

Answer 2

您可以在VehicleTransferData类中发布代码吗？

也许JSON不会返回数组而是返回一个对象。如果是这种情况，则改为：

 @Headers("Content-Type: application/json")
@POST("pendingTransfers")
Call<VehicleTransferData> refreshVehicles(@Body VehicleTransferData msg);

活动

call.enqueue(new Callback<VehicleTransferData>()
    {
        @Override
        public void onResponse(Call<VehicleTransferData> call, Response<VehicleTransferData> response) {

            Toast.makeText(RegisteredVehicles.this, response.body().get(0).getVehicleReg(),Toast.LENGTH_LONG).show();
        }

        @Override
        public void onFailure(Call<VehicleTransferData> call, Throwable t) {
            Toast.makeText(RegisteredVehicles.this, t.getMessage(),Toast.LENGTH_LONG).show();
        }
    });

使用retrofit2处理对象数组响应

2 个答案: