英文:
Access to Nested Json Kotlin
问题
我不知道如何从嵌套的Json中获取数据
{
"results":[
{
"id":1,
"name":"Rick Sanchez",
"status":"Alive",
"species":"Human",
"type":"",
"gender":"Male"
}
]
}
Json看起来像上面这样，我想要访问name变量。
我的代码：
数据类：
data class Movie(
@Json(name = "results") val results: List<MovieDetail>
)
data class MovieDetail(
@Json(name = "name") val name: String
)
ApiService：
private const val BASE_URL = "https://rickandmortyapi.com/api/"
private val moshi = Moshi.Builder()
.add(KotlinJsonAdapterFactory())
.build()
private val retrofit = Retrofit.Builder()
.addConverterFactory(MoshiConverterFactory.create(moshi))
.baseUrl(BASE_URL)
.build()
interface MovieApiService {
@GET("character")
suspend fun getMovies(): List<Movie>
}
object MovieApi {
val retrofitService : MovieApiService by lazy {
retrofit.create(MovieApiService::class.java)
}
}
ViewModel：
private val _status = MutableLiveData<String>()
val status: LiveData<String> = _status
init {
getMovies()
}
private fun getMovies() {
viewModelScope.launch {
val listResult = MovieApi.retrofitService.getMovies()
_status.value = "Success: ${listResult.size} names retrieved"
}
}
对于普通的Json没有问题，但我不知道如何访问这些嵌套的变量，我认为我必须从数据类中使用"results"变量，但我不知道在哪里和如何使用。
在运行应用程序时，我收到错误：Expected BEGIN_ARRAY but was BEGIN_OBJECT at path $
英文:
I don't know how to get data from nested Json
{
"results":[
{
"id":1,
"name":"Rick Sanchez",
"status":"Alive",
"species":"Human",
"type":"",
"gender":"Male",
Json looks like above, i want to get access to name variable.
My code:
Data class:
data class Movie(
@Json(name = "results") val results: List<MovieDetail>
)
data class MovieDetail(
@Json(name = "name") val name: String
)
ApiService:
private const val BASE_URL = "https://rickandmortyapi.com/api/"
private val moshi = Moshi.Builder()
.add(KotlinJsonAdapterFactory())
.build()
private val retrofit = Retrofit.Builder()
.addConverterFactory(MoshiConverterFactory.create(moshi))
.baseUrl(BASE_URL)
.build()
interface MovieApiService {
@GET("character")
suspend fun getMovies(): List<Movie>
}
object MovieApi {
val retrofitService : MovieApiService by lazy {
retrofit.create(MovieApiService::class.java)
}
}
And ViewModel:
private val _status = MutableLiveData<String>()
val status: LiveData<String> = _status
init {
getMovies()
}
private fun getMovies() {
viewModelScope.launch {
val listResult = MovieApi.retrofitService.getMovies()
_status.value = "Success: ${listResult.size} names retrieved"
}
}
For plain Json there is no problem but i don't know how to get access to this nested variables, i think that i have to use "results" variable from data class but i don't know where and how.
During running app i've got error: Expected BEGIN_ARRAY but was BEGIN_OBJECT at path $
答案1
得分: 1
你应该将以下代码更改为：
@GET("character")
suspend fun getMovies(): Movie
你正在接收一个对象，而不是对象的列表。
英文:
You should change
@GET("character")
suspend fun getMovies(): List<Movie>
To:
@GET("character")
suspend fun getMovies(): Movie
You are receiving object and not list of objects
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