java.lang.IllegalStateException：应为 BEGIN_ARRAY，但在第 1 行第 1 列路径 $ 错误

Question

我知道这个问题还有其他一些主题，但我找不到我的错误的解决方案，所以如果您有任何建议，请告诉我。我正在尝试在正文中创建一个带有参数的 POST 请求，以从 API 中检索一些数据。

我的 DataApi 界面：

interface ChartsDataApi {

@POST(NetworkUtils.CASH_COLLECTION_URL)
fun getCashCollection(@Body guid: String) : Call<List<CashCollection>>

@POST(NetworkUtils.TICKETS_DETAILS_URL)
fun getTicketsDetails() : Call<List<TicketDetails>>

}

我在使用 Retrofit 和试图获得响应的地方很有趣：

private fun geCashCollectionDetails(){
    var params : MutableMap<String, String> = HashMap()
    val BASE_URL = " here i wrote the base URL "
    val gson = GsonBuilder()
            .setLenient()
            .create()
   val api = Retrofit.Builder()
           .baseUrl(BASE_URL)
           .addConverterFactory(GsonConverterFactory.create(gson))
           .build()
           .create(ChartsDataApi::class.java)

    GlobalScope.launch(Dispatchers.IO){
        val response = api.getCashCollection(" **here i wrote the guid** ").awaitResponse()
        if(response.isSuccessful){
            val day = response.body()!!.lastIndex
            Log.d("RAZZ", day.toString())
            withContext(Dispatchers.Main){
            }
        }
    }

我的 CashCollection 数据类：

data class CashCollection(
    @SerializedName("label")
    val label: String?,
    @SerializedName("value")
    val value: String?)

来自服务器的响应： {"data":[{"label":"12.10.2020","value":"0,00"},{"label":"16.10.2020","value":"0,00 "},{"label":"17.10.2020","value":"0,00"},{"label":"18.10.2020","value":"0,00"}],"货币":"欧元"}

Process: com.eschbachit.citylinemobile, PID: 32529
com.google.gson.JsonSyntaxException: java.lang.IllegalStateException: Expected BEGIN_OBJECT but was STRING at line 1 column 1 path $
    at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.read(ReflectiveTypeAdapterFactory.java:226)
    at retrofit2.converter.gson.GsonResponseBodyConverter.convert(GsonResponseBodyConverter.java:37)
    at retrofit2.converter.gson.GsonResponseBodyConverter.convert(GsonResponseBodyConverter.java:25)
    at retrofit2.OkHttpCall.parseResponse(OkHttpCall.java:243)
    at retrofit2.OkHttpCall$1.onResponse(OkHttpCall.java:153)
    at okhttp3.RealCall$AsyncCall.execute(RealCall.java:174)
    at okhttp3.internal.NamedRunnable.run(NamedRunnable.java:32)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1133)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:607)
    at java.lang.Thread.run(Thread.java:776)
 Caused by: java.lang.IllegalStateException: Expected BEGIN_OBJECT but was STRING at line 1 column 1 path $
    at com.google.gson.stream.JsonReader.beginObject(JsonReader.java:385)
    at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.read(ReflectiveTypeAdapterFactory.java:215)
    at retrofit2.converter.gson.GsonResponseBodyConverter.convert(GsonResponseBodyConverter.java:37) 
    at retrofit2.converter.gson.GsonResponseBodyConverter.convert(GsonResponseBodyConverter.java:25) 
    at retrofit2.OkHttpCall.parseResponse(OkHttpCall.java:243) 
    at retrofit2.OkHttpCall$1.onResponse(OkHttpCall.java:153) 
    at okhttp3.RealCall$AsyncCall.execute(RealCall.java:174) 
    at okhttp3.internal.NamedRunnable.run(NamedRunnable.java:32) 
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1133) 
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:607) 
    at java.lang.Thread.run(Thread.java:776) 

当我尝试测试和检查收到的数据时，我收到了该错误。

Answer 1

请提供您的数据类别和来自服务器的响应。此错误意味着来自服务器的数据无法映射到您作为这些请求的结果提供的数据类中。

好的，数据类必须准确反映响应的结构。你的CashCollection 类必须是

data class CashCollection(
    val data: ArrayList<CashCollectionItem>,
    val currency: String
) {
   data class CashCollectionItem(
       @SerializedName("label")
       val label: String?,
       @SerializedName("value")
       val value: String?)
}

以及回复类型Call<CashCollection>

Answer 2

您似乎错误地将您的 api 响应映射到 kotlin 类。在您的 Retrofit api 中，您说您希望 api 返回 CashCollections 列表 ([{"label":"12.12.1212", "value": ""0,00}])，但服务器返回一个 json 对象，该数组位于 data 属性中：{"data":[{"label":"12.12.1212", "value": "0,00"}]}

您应该更新您的改造界面以对应 api 返回的内容：

class CashCollectionResponse(
  @SerializedName("data") data: List<CashCollection>
)

interface ChartsDataApi {
  @POST("GetTheData")
  fun getCashCollection(@Body guid: String): Call<CashCollectionResponse>
}