Android 应为 BEGIN_OBJECT 但为 BEGIN_ARRAY

Question

当我启动我的应用程序时，我不断收到此错误。我不知道为什么会出现此错误，因为我的 Response 类在构造函数中有列表。我看到了这个link，但我没有找到我的问题的答案。我正在使用 json server 作为虚拟 RESTful api。

E/AndroidRuntime: FATAL EXCEPTION: main
    Process: com.social.network, PID: 3448
    com.google.gson.JsonSyntaxException: java.lang.IllegalStateException: Expected BEGIN_OBJECT but was BEGIN_ARRAY at line 1 column 2 path $
        at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.read(ReflectiveTypeAdapterFactory.java:226)
        at retrofit2.converter.gson.GsonResponseBodyConverter.convert(GsonResponseBodyConverter.java:40)
        at retrofit2.converter.gson.GsonResponseBodyConverter.convert(GsonResponseBodyConverter.java:27)
        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:1167)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641)
        at java.lang.Thread.run(Thread.java:929)
     Caused by: java.lang.IllegalStateException: Expected BEGIN_OBJECT but was BEGIN_ARRAY at line 1 column 2 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:40) 
        at retrofit2.converter.gson.GsonResponseBodyConverter.convert(GsonResponseBodyConverter.java:27) 
        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:1167) 
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641) 
        at java.lang.Thread.run(Thread.java:929) 
I/Process: Sending signal. PID: 3448 SIG: 9

这是我的 Api 接口：

interface Api {

    companion object {
        const val BASE_URL = "http://be7c232bf30e.ngrok.io "
    }

    @GET("/posts")
    suspend fun searchPhotos(
        @Query("_page") page: Int,
        @Query("_limit") perPage: Int
    ): Response
}

这是响应数据类：

data class Response(
    val results: List<Post>
)

Answer 1

您可能应该返回Post 的列表或Response 的列表

interface Api {

    companion object {
        const val BASE_URL = "http://be7c232bf30e.ngrok.io "
    }

    @GET("/posts")
    suspend fun searchPhotos(
        @Query("_page") page: Int,
        @Query("_limit") perPage: Int
    ): List<Post> // or List<Response>
}