android – 无法在Retrofit 2中解析错误

概述我正在使用Retrofit 2,我在这一行得到一个空指针异常： RetrofitClient.APIError error = RetrofitClient.ErrorUtils.parseError(response, retrofit); 错误为空.更多细节： 这是API返回错误的格式： { "error": { "message": "Incorrect credentials" 我正在使用Retrofit 2,我在这一行得到一个空指针异常：

RetrofitClIEnt.APIError error = RetrofitClIEnt.ErrorUtils.parseError(response,retrofit);

错误为空.更多细节：

这是API返回错误的格式：

{  "error": {    "message": "Incorrect credentials","statusCode": 401  }}

这是我的登录回调代码：

new Callback<LoginResponse>() {    @OverrIDe    public voID onResponse(Response<LoginResponse> response,Retrofit retrofit) {       if (Listener != null) {           if (response.isSuccess() && response.body() != null) {               User user = RetrofitUserToUserMapper.fromretrofitUser(response.body().getLoginUser());           } else {               RetrofitClIEnt.APIError error = RetrofitClIEnt.ErrorUtils.parseError(response,retrofit);               Listener.onUserLoginFailure(error.getErrorMessage()); // NPE - error is null           }        }    }    @OverrIDe    public voID onFailure(Throwable t) {        if (Listener != null) {            Listener.onUserLoginFailure("");        }    }}

这是我的Retrofit 2课程：

public class RetrofitClIEnt {    public static final String API_ROOT = "http://example.com/API/v1/";    private static final String header_OS_VERSION = "X-OS-Type";    private static final String header_APP_VERSION = "X-App-Version";    private static final String header_OS_VERSION_VALUE_ANDROID = "androID";    private RetrofitClIEnt() {    }    private static Retrofit INSTANCE;    public static Retrofit getInstance() {        if (INSTANCE == null) {            setupRestClIEnt();        }        return INSTANCE;    }    public static voID setupRestClIEnt() {        OkhttpClIEnt httpClIEnt = new OkhttpClIEnt();        addheadersrequiredForAllRequests(httpClIEnt,BuildConfig.VERSION_name);        INSTANCE = new Retrofit.Builder()                .baseUrl(API_ROOT)                .addConverterFactory(GsonConverterFactory.create())                .clIEnt(httpClIEnt)                .build();    }    private static voID addheadersrequiredForAllRequests(OkhttpClIEnt httpClIEnt,final String appVersion) {        class RequestInterceptor implements Interceptor {            @OverrIDe            public com.squareup.okhttp.Response intercept(Chain chain) throws IOException {                Request request = chain.request().newBuilder()                        .addheader(header_OS_VERSION,header_OS_VERSION_VALUE_ANDROID)                        .addheader(header_APP_VERSION,appVersion)                        .build();                return chain.proceed(request);            }        }        httpClIEnt.networkInterceptors().add(new RequestInterceptor());    }    public static class ErrorUtils {        public static APIError parseError(Response<?> response,Retrofit retrofit) {            Converter<ResponseBody,APIError> converter =                    retrofit.responseConverter(APIError.class,new Annotation[0]);            APIError error;            try {                error = converter.convert(response.errorBody());            } catch (IOException e) {                e.printstacktrace();                return new APIError();            } catch (Exception e) {                e.printstacktrace();                return new APIError();            }            return error;        }    }    public static class APIError {        @Serializedname("error")        public        ErrorResponse loginError;        public ErrorResponse getLoginError() {            return loginError;        }        public String getErrorMessage() {            return loginError.message;        }        private class ErrorResponse {            @Serializedname("message")            private String message;            @Serializedname("statusCode")            public int statusCode;            public String getMessage() {                return message;            }            public int getStatusCode() {                return statusCode;            }            @OverrIDe            public String toString() {                return "LoginErrorResponseBody{" +                        "message='" + getMessage() + '\'' +                        ",statusCode=" + statusCode +                        '}';            }            public voID setMessage(String message) {                this.message = message;            }        }    }}

我从本教程获得了错误utils类,但稍微改了一下因为它们的示例中的错误格式不同：

编辑：这是Converter类：

/** * Convert objects to and from their representation as http bodIEs. Register a converter with * Retrofit using {@link Retrofit.Builder#addConverterFactory(Factory)}. */public interface Converter<F,T> {  T convert(F value) throws IOException;  abstract class Factory {    /**     * Create a {@link Converter} for converting an http response body to {@code type} or null if it     * cannot be handled by this factory.     */    public Converter<ResponseBody,?> fromresponseBody(Type type,Annotation[] annotations) {      return null;    }    /**     * Create a {@link Converter} for converting {@code type} to an http request body or null if it     * cannot be handled by this factory.     */    public Converter<?,Requestbody> toRequestbody(Type type,Annotation[] annotations) {      return null;    }  }}

解决方法 更新：

如果要在下面使用自定义类而不是JsONObject,可以参考以下内容：

自定义类：

public class ResponseError {    Error error;    class Error {        int statusCode;        String message;    }}

将以下内容添加到WebAPIService接口：

@GET("/API/geterror")Call<ResponseError> getError2();

然后,在MainActivity.java中：

Call<ResponseError> responseErrorCall = service.getError2();responseErrorCall.enqueue(new Callback<ResponseError>() {    @OverrIDe    public voID onResponse(Response<ResponseError> response,Retrofit retrofit) {        if (response.isSuccess() && response.body() != null){            Log.i(LOG_TAG,response.body().toString());        } else {            if (response.errorBody() != null){                RetrofitClIEnt.APIError error = RetrofitClIEnt.ErrorUtils.parseError(response,retrofit);                Log.e(LOG_TAG,error.getErrorMessage());            }        }    }    @OverrIDe    public voID onFailure(Throwable t) {        Log.e(LOG_TAG,t.toString());    }});

我刚用我的Web服务测试了你的RetrofitClIEnt类.我对你的APIError类做了一个小的更新,如下所示(添加2个构造函数,实际上它们没有被调用)：

public APIError(){    this.loginError = new ErrorResponse();}public APIError(int statusCode,String message) {    this.loginError = new ErrorResponse();    this.loginError.statusCode = statusCode;    this.loginError.message = message;}

接口：

public interface WebAPIService {    @GET("/API/geterror")    Call<JsONObject> getError();}

主要活动：

// Retrofit 2.0-beta2Retrofit retrofit = new Retrofit.Builder()        .baseUrl(API_URL_BASE)        .addConverterFactory(GsonConverterFactory.create())        .build();WebAPIService service = retrofit.create(WebAPIService.class);Call<JsONObject> JsonObjectCall = service.getError();JsonObjectCall.enqueue(new Callback<JsONObject>() {    @OverrIDe    public voID onResponse(Response<JsONObject> response,t.toString());    }});

我的Web服务(Asp.Net Web API)：

根据您的JsON响应数据,我使用了以下代码：

[Route("API/geterror")]public httpResponseMessage GetError(){    var detailError = new    {        message = "Incorrect credentials",statusCode = 401    };    var myError = new    {        error = detailError    };                return Request.CreateResponse(httpStatusCode.Unauthorized,myError);}

它的工作原理！希望能帮助到你！

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