私はSpaceX社へのAPI呼び出しを行うにしようとしていますが、私は私の応答にエラーを取得しておきます。私のPOJOが問題ですか？

フアン・ピメンテル：

だから、現在、私は、起動（取得するAPI呼び出しを行うにしようとしていますhttps://api.spacexdata.com/v3/launchesを SpaceX社から）。POJOが誤って生成された場合、私は言うことができません。何らかの理由で、私はこのエラーを得続けます

E/AndroidRuntime: FATAL EXCEPTION: DefaultDispatcher-worker-1
    Process: com.example.spacex, PID: 13481
    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:39)
        at retrofit2.converter.gson.GsonResponseBodyConverter.convert(GsonResponseBodyConverter.java:27)
        at retrofit2.OkHttpCall.parseResponse(OkHttpCall.java:225)
        at retrofit2.OkHttpCall$1.onResponse(OkHttpCall.java:121)
        at okhttp3.RealCall$AsyncCall.execute(RealCall.java:206)
        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:919)

私は、最新の打ち上げを取得するためのAPI呼び出しを行うとき、私は実際の応答を取得します

I/Choreographer: Skipped 83 frames!  The application may be doing too much work on its main thread.
I/OpenGLRenderer: Davey! duration=1418ms; Flags=0, IntendedVsync=15042096638405, Vsync=15043479971683, OldestInputEvent=9223372036854775807, NewestInputEvent=0, HandleInputStart=15043493004500, AnimationStart=15043493189900, PerformTraversalsStart=15043494154700, DrawStart=15043498745100, SyncQueued=15043501592400, SyncStart=15043502485000, IssueDrawCommandsStart=15043502592300, SwapBuffers=15043503508300, FrameCompleted=15043516419500, DequeueBufferDuration=921000, QueueBufferDuration=671000, 
I/System.out: SpaceXResponse(missionName=CRS-20, staticFireDateUtc=2020-03-01T10:20:00.000Z, launchYear=2020, launchDateUtc=2020-03-07T04:50:31.000Z, launchFailureDetails=null, flightNumber=91, isTentative=false, rocket=Rocket(secondStage=SecondStage(payloads=[PayloadsItem(payloadType=Dragon 1.1, payloadMassKg=1977.0, payloadId=CRS-20, nationality=United States, noradId=[], customers=[NASA (CRS)], orbit=ISS, orbitParams=OrbitParams(periapsisKm=null, meanAnomaly=null, inclinationDeg=null, regime=low-earth, argOfPericenter=null, eccentricity=null, apoapsisKm=null, semiMajorAxisKm=null, raan=null, epoch=null, lifespanYears=null, referenceSystem=geocentric, periodMin=null, meanMotion=null, longitude=null), payloadMassLbs=4358.539, reused=true, manufacturer=SpaceX)], block=5.0), rocketId=falcon9, firstStage=FirstStage(cores=[CoresItem(flight=2, landingType=RTLS, gridfins=true, landingIntent=true, legs=true, landSuccess=true, landingVehicle=LZ-1, block=5.0, reused=true, coreSerial=B1059)]), rocketType=FT, rocketName=Falcon 9, fairings=null), missionId=[EE86F74], launchWindow=0, crew=null, launchDateLocal=2020-03-06T23:50:31-05:00, tentativeMaxPrecision=hour, ships=[], launchDateUnix=1583556631, launchSuccess=true, staticFireDateUnix=1583058000, tbd=false, timeline=null, telemetry=Telemetry(flightClub=null), links=Links(missionPatchSmall=https://i.imgur.com/LIrgTnt.png, missionPatch=https://i.imgur.com/LIrgTnt.png, videoLink=https://youtu.be/1MkcWK2PnsU, flickrImages=[], redditRecovery=null, redditMedia=null, redditCampaign=https://www.reddit.com/r/spacex/comments/ezn6n0/crs20_launch_campaign_thread, wikipedia=https://en.wikipedia.org/wiki/SpaceX_CRS-20, redditLaunch=https://www.reddit.com/r/spacex/comments/fe8pcj/rspacex_crs20_official_launch_discussion_updates/, youtubeId=1MkcWK2PnsU, presskit=https://www.spacex.com/sites/spacex/files/crs-20_mission_press_kit.pdf, articleLink=null), details=SpaceX's 20th and final Crew Resupply Mission under the original NASA CRS contract, this mission brings essential supplies to the International Space Station using SpaceX's reusable Dragon spacecraft. It is the last scheduled flight of a Dragon 1 capsule. (CRS-21 and up under the new Commercial Resupply Services 2 contract will use Dragon 2.) The external payload for this mission is the Bartolomeo ISS external payload hosting platform. Falcon 9 and Dragon will launch from SLC-40, Cape Canaveral Air Force Station and the booster will land at LZ-1. The mission will be complete with return and recovery of the Dragon capsule and down cargo., launchSite=LaunchSite(siteName=CCAFS SLC 40, siteId=ccafs_slc_40, siteNameLong=Cape Canaveral Air Force Station Space Launch Complex 40), upcoming=false)

これは私のViewModelです

class MainViewModel : ViewModel() {
    private val spaceRepo : Repository = Repository(SpaceService.spaceApi)
    val spaceLiveData = liveData(Dispatchers.IO){
        val data = spaceRepo.getLaunch()
        emit(data)
        println(data)
    }
}

これは私のリポジトリであります

class Repository(private val apiInterface : SpaceXInterface) {
    suspend fun getLaunch() = apiInterface.fetchLaunches()
}

これは私のサービスです

object SpaceService{

   private const val BASE_URL : String = "https://api.spacexdata.com/"

   private val retrofit = Retrofit.Builder()
      .baseUrl(BASE_URL)
      .addConverterFactory(GsonConverterFactory.create())
      .addCallAdapterFactory(CoroutineCallAdapterFactory())
      .build()

   val spaceApi: SpaceXInterface = retrofit.create(SpaceXInterface::class.java)
}

これは私のインターフェイスです

interface SpaceXInterface {

    @GET("v3/launches/latest")
    suspend fun fetchLaunches() : SpaceXResponse

}

そして、これは私の応答であるPOJO

data class SpaceXResponse(

    @field:SerializedName("mission_name")
    val missionName: String? = null,

    @field:SerializedName("static_fire_date_utc")
    val staticFireDateUtc: String? = null,

    @field:SerializedName("launch_year")
    val launchYear: String? = null,

    @field:SerializedName("launch_date_utc")
    val launchDateUtc: String? = null,

    @field:SerializedName("launch_failure_details")
    val launchFailureDetails: LaunchFailureDetails? = null,

    @field:SerializedName("flight_number")
    val flightNumber: Int? = null,

    @field:SerializedName("is_tentative")
    val isTentative: Boolean? = null,

    @field:SerializedName("rocket")
    val rocket: Rocket? = null,

    @field:SerializedName("mission_id")
    val missionId: List<Any?>? = null,

    @field:SerializedName("launch_window")
    val launchWindow: Int? = null,

    @field:SerializedName("crew")
    val crew: Any? = null,

    @field:SerializedName("launch_date_local")
    val launchDateLocal: String? = null,

    @field:SerializedName("tentative_max_precision")
    val tentativeMaxPrecision: String? = null,

    @field:SerializedName("ships")
    val ships: List<Any?>? = null,

    @field:SerializedName("launch_date_unix")
    val launchDateUnix: Int? = null,

    @field:SerializedName("launch_success")
    val launchSuccess: Boolean? = null,

    @field:SerializedName("static_fire_date_unix")
    val staticFireDateUnix: Int? = null,

    @field:SerializedName("tbd")
    val tbd: Boolean? = null,

    @field:SerializedName("timeline")
    val timeline: Timeline? = null,

    @field:SerializedName("telemetry")
    val telemetry: Telemetry? = null,

    @field:SerializedName("links")
    val links: Links? = null,

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

    @field:SerializedName("launch_site")
    val launchSite: LaunchSite? = null,

    @field:SerializedName("upcoming")
    val upcoming: Boolean? = null
)

サダト：

エラーは、そのリストがないオブジェクトを返す、あなたはあなたの呼び出しを変更する必要があることを述べています

interface SpaceXInterface {
    @GET("v3/launches/latest")
    suspend fun fetchLaunches() : List<SpaceXResponse>
}

それに応じて他の部分を変更します。