Android：Kotlin - Retrofit2 - Moshi |处理复杂的 json

Question

我正在尝试使用此 API 请求获取游戏列表。 https://steamspy.com/api.php?request=top100forever

但是我认为我的问题是所有游戏都在另一个东西里面，只有 appid。这是响应的样子

{
  "10": {
    "appid": 10,
    "name": "Counter-Strike",
    "developer": "Valve",
    "publisher": "Valve",
    "score_rank": "",
    "positive": 143404,
    "negative": 3739,
    "userscore": 0,
    "owners": "20,000,000 .. 50,000,000",
    "average_forever": 9671,
    "average_2weeks": 815,
    "median_forever": 287,
    "median_2weeks": 925,
    "price": "99",
    "initialprice": "999",
    "discount": "90"
  },
  "30": {
    "appid": 30,
    "name": "Day of Defeat",
    "developer": "Valve",
    "publisher": "Valve",
    "score_rank": "",
    "positive": 3885,
    "negative": 463,
    "userscore": 0,
    "owners": "5,000,000 .. 10,000,000",
    "average_forever": 259,
    "average_2weeks": 0,
    "median_forever": 33,
    "median_2weeks": 0,
    "price": "49",
    "initialprice": "499",
    "discount": "90"
  },
  ....
}

我的 apiService:

private const val BASE_URL_GAMES = "https://steamspy.com/"

private val moshi = Moshi.Builder()
    //.add(ResponseGetGamesAdapter())
    .add(KotlinJsonAdapterFactory())
    .build()

//OkhttpClient for building http request url
private val tmdbClient = OkHttpClient().newBuilder()
    .build()

private val retrofit = Retrofit.Builder()
    .client(tmdbClient)
    .addConverterFactory(MoshiConverterFactory.create(moshi))
    .addCallAdapterFactory(CoroutineCallAdapterFactory())
    .baseUrl(BASE_URL_GAMES)
    .build()


interface GameApiService{
    @GET("api.php?request=top100forever")
    fun getTop100(): Deferred<List<Game>>

}



object GameApi {
    val retrofitService: GameApiService by lazy {
        retrofit.create(GameApiService::class.java)
    }
}

视图模型

enum class GameApiStatus { LOADING, ERROR, DONE }

class GameOverviewViewModel : ViewModel() {
    // TODO: Implement the
    private val _response = MutableLiveData<String>()
    private val _status = MutableLiveData<GameApiStatus>()

    //private var gameRepository: GameRepository = GameRepository()

    // The external immutable LiveData for the response String
    val response: LiveData<GameApiStatus>
        get() = _status

    private val _properties = MutableLiveData<List<Game>>()
    val properties: LiveData<List<Game>>
        get() = _properties

    // Create a Coroutine scope using a job to be able to cancel when needed
    private var viewModelJob = Job()

    // the Coroutine runs using the Main (UI) dispatcher
    private val coroutineScope = CoroutineScope(viewModelJob + Dispatchers.Main )

    init {
        getTop100()
    }

    private fun getTop100() {
        coroutineScope.launch {
            // Get the Deferred object for our Retrofit request
            var getPropertiesDeferred = GameApi.retrofitService.getTop100()
            try {
                // Await the completion of our Retrofit request
                var listResult = getPropertiesDeferred.await()
                _status.value = GameApiStatus.DONE
                _properties.value = listResult
            } catch (e: Exception) {
                val error = e.message
                _status.value = GameApiStatus.ERROR
                _properties.value = ArrayList()
            }
        }
    }

    /**
     * When the [ViewModel] is finished, we cancel our coroutine [viewModelJob], which tells the
     * Retrofit service to stop.
     */
    override fun onCleared() {
        super.onCleared()
        viewModelJob.cancel()
    }
}

游戏模型

data class Game(
    //var id:Int,
    @field:Json(name = "appid")
    var appid:Int,
    @field:Json(name = "name")
    var name:String
    //var desc:String
)

在这一点上，我已经苦苦挣扎了这么久，我可能在途中弄坏了更多东西哈哈我假设我需要某种适配器，但我绝对一无所知。试图尽可能接近我们课程中的完成方式，但此时我将采取任何工作方式：D

Answer 1

看来问题出在这里：

interface GameApiService{
@GET("api.php?request=top100forever")
fun getTop100(): Deferred<List<Game>>
}

你在你的代码中说你会得到一个 Game 对象的 List，但是你的 api 没有给你那个。

这是您的回复api：

{
  "10": {
    "appid": 10,
    ...
    },
  "30": {
    "appid": 30,
    ...
    }
}

在此示例中，您的 API 返回的是一个对象 10，其中包含许多其他数据，以及一个对象 30，其中包含许多其他数据。似乎 10 和 30 包含相同的字段，因此可以帮助您。

这意味着你可以创建一个新数据class，可以调用GameServiceResponse。

data class GameServiceResponse(
    @Json(name = "10") val 10: Game,
    @Json(name = "30") val 30: Game
)

然后您更改 GameApiService 以接受此回复。但是，您一开始就没有收到 List，所以必须取消。

interface GameApiService{
@GET("api.php?request=top100forever")
fun getTop100(): Deferred<GameServiceResponse>
}

最后，当你食用它时，你会得到类似 getPropertiesDeferred.10.appid

的东西

还有一件事：由于您使用的是 moshi，我相信您仍然需要告诉 api class 您正在使用 moshi 进行反序列化（如果您的适配器是做这部分）：

interface GameApiService{

@MoshiDeserialization
@GET("api.php?request=top100forever")
fun getTop100(): Deferred<GameServiceResponse>
}

我希望这是有道理的。

Answer 2

尝试如下更新：更新服务

interface GameApiService{
    @GET("api.php?request=top100forever")
    fun getTop100(): Deferred<Map<String,Game>>
}

然后你会从API得到地图的结果。

Android：Kotlin - Retrofit2 - Moshi |处理复杂的 json

Android: Kotlin - Retrofit2 - Moshi | working with complex json

android

kotlin

moshi

retrofit2