改装& Mochi:空响应(和奇怪的bug)

Question

我有遇到过的最奇怪的虫子。

对于一个学校项目，我需要得到这个API接口的JSON。我没有遇到任何错误，但是响应体是空的。不完全为空，但仍然为空。首先，下面是我用来获取数据的代码(是的，它在UI线程中，但这不是我的主要问题)

    val moshi = Moshi.Builder()
            .add(KotlinJsonAdapterFactory())
            .build()

        val retrofit: Retrofit = Retrofit.Builder()
            .baseUrl("http://barcelonaapi.marcpous.com")
            .addConverterFactory(MoshiConverterFactory.create(moshi))
            .build()

        val service = retrofit.create(StationAPI::class.java)
        val call = service.stationsList()

        call.enqueue(object : Callback<StationResponse> {
            override fun onResponse(
                call: Call<StationResponse>,
                response: Response<StationResponse>
            ) {
                val statusCode: Int = response.code()
                val resp: StationResponse? = response.body()

                Log.d("JSON", "Status code: $statusCode")
                Log.d("JSON", "Resp: $resp")
            }

            override fun onFailure(call: Call<StationResponse>?, t: Throwable) {
                t.printStackTrace()
            }
        })

下面是我的数据类：

interface StationAPI {
    @GET("/bus/nearstation/latlon/41.3985182/2.1917991/1.json")
    fun stationsList(): Call<StationResponse>
}

data class StationResponse (
    @field:Json(name = "code") var code: Int,
    @field:Json(name = "data") var data: NearStation
)

data class NearStation(
    @field:Json(name = "nearstations") var stations: List<Station>
)

data class Station(
    @field:Json(name = "id") var id: Long,
    @field:Json(name = "street_name") var streetName: String?,
    @field:Json(name = "city") var city: String?,
    @field:Json(name = "utm_x") var utmX: String?,
    @field:Json(name = "utm_y") var utmY: String?,
    @field:Json(name = "lat") var latitude: String?,
    @field:Json(name = "lon") var longitude: String?,
    @field:Json(name = "furniture") var furniture: String?,
    @field:Json(name = "buses") var buses: String?,
    @field:Json(name = "distance") var distance: Float,
)

在onResponse()中，响应代码总是等于0(Int的默认值)，数据总是为null。但是，现在乐趣开始了。如果我注释@field:Json(name = "data") var data: NearStation，代码参数现在应该是200。

为了给这个有趣的蛋糕增添更多的乐趣，一个朋友有着完全相同的代码，但这对他来说是有效的。

帮帮忙，我不明白。

Answer 1

您应该使用@Json注释而不是java字段注释@field:Json。应该是这样的

data class StationResponse (
    @Json(name = "code") var code: Int,
    @Json(name = "data") var data: NearStation
)

data class NearStation(
    @Json(name = "nearstations") var stations: List<Station>
)

data class Station(
    @Json(name = "id") var id: Long,
    @Json(name = "street_name") var streetName: String?,
    @Json(name = "city") var city: String?,
    @Json(name = "utm_x") var utmX: String?,
    @Json(name = "utm_y") var utmY: String?,
    @Json(name = "lat") var latitude: String?,
    @Json(name = "lon") var longitude: String?,
    @Json(name = "furniture") var furniture: String?,
    @Json(name = "buses") var buses: String?,
    @Json(name = "distance") var distance: Float,
)