[英]Android: Kotlin - Retrofit2 - Moshi | working with complex json
我正在嘗試使用此 API 請求獲取游戲列表。 https://steamspy.com/api.php?request=top100forever
但是我相信我的問題是所有游戲都在另一個東西里面,只有 appid。 這就是響應的樣子
{
"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)
}
}
視圖模型
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()
}
}
游戲模型
data class Game(
//var id:Int,
@field:Json(name = "appid")
var appid:Int,
@field:Json(name = "name")
var name:String
//var desc:String
)
在這一點上,我一直在苦苦掙扎,我可能在路上弄壞了更多東西,哈哈,我認為我需要某種適配器,但我絕對一無所知。 試圖盡可能接近我們課程中的完成方式,但此時我會采取任何工作方式:D
問題似乎在這里:
interface GameApiService{
@GET("api.php?request=top100forever")
fun getTop100(): Deferred<List<Game>>
}
你在你的代碼中說你會得到一個Game
對象的List
,但你的 api 沒有給你。
這是來自您的 api 的響應:
{
"10": {
"appid": 10,
...
},
"30": {
"appid": 30,
...
}
}
在此示例中,您的 API 返回的是一個對象10
,其中包含許多其他數據,以及一個對象30
,其中包含許多其他數據。 似乎10
和30
包含相同的字段,因此可以在以后提供幫助。
這意味着您可以創建一個名為GameServiceResponse
的新數據類。
data class GameServiceResponse(
@Json(name = "10") val 10: Game,
@Json(name = "30") val 30: Game
)
然后您更改您的GameApiService
以接受此響應。 但是,您從一開始就沒有收到List
,因此必須這樣做。
interface GameApiService{
@GET("api.php?request=top100forever")
fun getTop100(): Deferred<GameServiceResponse>
}
最后,當你使用它時,你會得到類似getPropertiesDeferred.10.appid
東西
另一件事:由於您使用的是 moshi,我相信您仍然需要告訴 api 類您正在使用 moshi 反序列化(如果您的適配器正在執行此部分,則可能不需要):
interface GameApiService{
@MoshiDeserialization
@GET("api.php?request=top100forever")
fun getTop100(): Deferred<GameServiceResponse>
}
我希望這是有道理的。
嘗試如下更新:更新服務
interface GameApiService{
@GET("api.php?request=top100forever")
fun getTop100(): Deferred<Map<String,Game>>
}
然后你會從API中得到map的結果。
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