当实际有值时，响应正文返回 null

Question

我希望响应正文在状态代码不成功时返回一个值，因为当我在 Postman 上尝试它时，它实际上给了我一条消息或 JSON 数组的属性之一。但是，当我尝试将响应主体存储到变量中时，它总是返回 null。不知道为什么

这是ApiService

@POST("register")
    fun registerAkun(
        @Body registrasiAkun: RegistrasiBodyRequest
    ): Call<RegistrasiResponse>

这是RemoteDataSource里面的方法

override fun registrasiAkun(registrasiAkun: RegistrasiBodyRequest): LiveData<ApiResponse<RegistrasiResponse>> {
        val result = MutableLiveData<ApiResponse<RegistrasiResponse>>()
        result.postValue(ApiResponse.Loading)
        EspressoIdlingResource.increment()

        val client = apiService.registerAkun(registrasiAkun)
        client.enqueue(object : Callback<RegistrasiResponse> {
            override fun onResponse(
                call: Call<RegistrasiResponse>,
                response: Response<RegistrasiResponse>
            ) {
                val data = response.body()
                Log.d("RemoteDataSource0", "$data")

                if (response.isSuccessful) {
                    result.postValue(data?.let {
                        ApiResponse.Success(data)
                    })
                } else {
                    data?.let {
                        result.postValue(ApiResponse.Error(it.message.toString()))
                    } ?: run {
                        Log.d("RemoteDataSource", "$data dan $response")
                    }
                }
            }

            override fun onFailure(call: Call<RegistrasiResponse>, t: Throwable) {
                Log.d("RemoteDataSourceFailure", t.message.toString())
                result.postValue(ApiResponse.Error(t.message.toString()))
            }
        })

        return result
    }

型号：

data class RegistrasiResponse(

    @SerializedName("message")
    val message: String? = null,

    @SerializedName("customer")
    val customer: CustomerResponse? = null
)

data class CustomerResponse(
    @field:SerializedName("nama_customer")
    val namaCustomer: String?,

    @field:SerializedName("id_customer")
    val idCustomer: Int?,

    @field:SerializedName("email_customer")
    val emailCustomer: String?
)

这是日志

I/okhttp.OkHttpClient: --> POST MY_URL
I/okhttp.OkHttpClient: Content-Type: application/json; charset=UTF-8
I/okhttp.OkHttpClient: Content-Length: 84
I/okhttp.OkHttpClient: {"email_customer":"tesaje@gmail.com","nama_customer":"tesdlu","password":"12345678"}
I/okhttp.OkHttpClient: --> END POST (84-byte body)
I/okhttp.OkHttpClient: <-- 409 MY_URL (287ms)
I/okhttp.OkHttpClient: x-powered-by: PHP/7.4.25
I/okhttp.OkHttpClient: cache-control: no-cache, private
I/okhttp.OkHttpClient: content-type: application/json
I/okhttp.OkHttpClient: vary: Accept-Encoding
I/okhttp.OkHttpClient: date: Thu, 25 Nov 2021 06:26:48 GMT
I/okhttp.OkHttpClient: server: LiteSpeed
I/okhttp.OkHttpClient: alt-svc: quic=":443"; ma=2592000; v="43,46", h3-Q043=":443"; ma=2592000, h3-Q046=":443"; ma=2592000, h3-Q050=":443"; ma=2592000, h3-25=":443"; ma=2592000, h3-27=":443"; ma=2592000
I/okhttp.OkHttpClient: {"message":"User Registration Failed!"}
I/okhttp.OkHttpClient: <-- END HTTP (39-byte body)
D/RemoteDataSource0: null
D/RemoteDataSource: null dan Response{protocol=h2, code=409, message=, url=MY_URL}

这就是 I expect 或 these

只要响应成功，就会返回这个

RegistrasiResponse(message=Registrasi Sukses, customer=CustomerResponse(namaCustomer=aaaaaa, idCustomer=50, emailCustomer=aaaaa@mail.com))

Postman response success

Answer 1

对于案例!isSuccessful，您应该从errorBody() 而不是body() 获取正文。

编辑：
您可能需要一个对象来保存message。例如

data class ErrorResponse(
    val message: String? = null
)

在onResponse() 内部看起来像这样

if (response.isSuccessful) {
    result.postValue(response.body()?.let { 
        ApiResponse.Success(it)
    })
} else {
    response.errorBody()?.string()?.let {
        val error = Gson().fromJson(it, ErrorResponse::class.java)
        result.postValue(ApiResponse.Error(error.message.orEmpty()))
    } ?: run {
        Log.d("RemoteDataSource", "${response.errorBody()?.string()} dan $response")
    }
}