如何使用Android中的Retrofit 2获取Post请求引发的纯文本错误消息？

Question

因此，我已向服务器发出了此POST请求，并且服务器将基于参数在Retrofit的errorBody（）内返回错误消息。我正在尝试处理服务器返回的纯文本错误，然后将其显示给使用Java的Android应用程序中的用户。以下是我当前的尝试，但这在Logcat中给了我这个错误：

@Url cannot be used with @POST URL (parameter #1)

这是来自服务器的400条响应：

接口：

public interface ChangePickLocationClient
{

@GET
Call<ResponseBody> checkItem(@Url String url, @Header("Authorization") String authToken);

@GET
Call<String> getStringError(@Url String url, @Header("Authorization") String authToken);


@POST("Pick/ChangePickLocationAcceptChange")
Call<String> changePickLocationPOST(@Url String url, @Header("Authorization") String authToken, @Body 
ChangePickLocationPostModel changePickLocationPostModel);
}

实施：

private static final String BASE_URL = "http://00.00.00.1234/api/";
Gson mGson = new Gson();
Retrofit retrofit = new Retrofit.Builder().client(new OkHttpClient())
        .baseUrl(BASE_URL).addConverterFactory(ScalarsConverterFactory.create())
        .addConverterFactory(GsonConverterFactory.create(mGson))
        .build();
        
 ChangePickLocationClient ChangePickLocationClient = 
 retrofitPOST.create(ChangePickLocationClient.class);
 String itemNumber = itemNumberValue.getText().toString();
 newPickLocationValue.setText(newPickLocationValue.getText().toString().toUpperCase());
 String newPickLocation = newPickLocationValue.getText().toString();
 String token = globalClass.getActiveToken();
    
 final ChangePickLocationClient mChangePickLocationInterface = 
    retrofit.create(ChangePickLocationClient.class);
                    Call<String> mCallErrorPOST = mChangePickLocationInterface.changePickLocationPOST
                            (postUrl, "Bearer " + globalClass.getActiveToken(), 
                                                  changePickLocationPostModel);
                    call.enqueue(new Callback<ChangePickLocationPostModel>()
                    {
                        @Override
                        public void onResponse(Call<ChangePickLocationPostModel> call, 
     Response<ChangePickLocationPostModel> response)
                        {
                            String mPlainTextResponse = null;
                            try {
                                if(response.errorBody() != null)
                                {
                                    mPlainTextResponse = response.errorBody().string();
                                }

                            } catch (IOException e)
                            {
                                e.printStackTrace();
                            }
                            Toast.makeText(ChangePickLocation.this, mPlainTextResponse 
      ,Toast.LENGTH_SHORT).show();
                        }

                        @Override
                        public void onFailure(Call<ChangePickLocationPostModel> call, Throwable t)
                        {
                            Toast.makeText(ChangePickLocation.this, "Unknown server error!" 
       ,Toast.LENGTH_SHORT).show();
                        }
                    });

Answer 1

当响应为400时，进行的第二个调用必须是clone（）调用。这是因为该呼叫不能多次使用，如文档中所述。

使用此：

call.clone().enqueue(new Callback<ChangePickLocationPostModel>()

代替

call.enqueue(new Callback<ChangePickLocationPostModel>()