改造 returns 200 响应代码，但我在访问字段时收到空值

Question

我正在使用改装向 API 发出网络请求。响应代码 returns 200 但我在尝试访问字段时收到 null。我检查了其他解决方案，但似乎无法解决我的问题。我正在使用 hilt

这是我的APIclass

interface BlockIOApi{

   @GET("/api/v2/get_balance/")
   suspend fun getBalance(
   @Query("api_key")
   apiKey: String = BuildConfig.API_KEY
   ): Response<BalanceResponse>
}

这是我的应用模块对象

AppModule

@Module
@InstallIn(ApplicationComponent::class)
object AppModule{
@Singleton
@Provides
fun provideOkHttpClient() = if (BuildConfig.DEBUG) {
    val loggingInterceptor = HttpLoggingInterceptor()
    loggingInterceptor.setLevel(HttpLoggingInterceptor.Level.BODY)
    OkHttpClient.Builder()
        .addInterceptor(loggingInterceptor)
        .build()
} else OkHttpClient
    .Builder()
    .build()


@Provides
@Singleton
fun providesRetrofit(okHttpClient: OkHttpClient): Retrofit =
    Retrofit.Builder()
        .addConverterFactory(GsonConverterFactory.create())
        .baseUrl(BASE_URL)
        .client(okHttpClient)
        .build()

@Provides
@Singleton
fun providesApiService(retrofit: Retrofit): BlockIOApi = retrofit.create(BlockIOApi::class.java)

}

最后是我的存储库，DefaultRepository.kt

class DefaultRepository @Inject constructor(
private val blockIOApi: BlockIOApi,
private val balanceDao: BalanceDao
):BlockIORepository {
override suspend fun getBalance(): Resource<BalanceResponse> {
  return try {
      val response = blockIOApi.getBalance()
      Log.d("TAG", "getBalance>>Response:${response.body()?.balance} ")
      if (response.isSuccessful){
          response.body().let {
              return@let Resource.success(it)
          }
      }else{
          Log.d("TAG", "getBalance: Error Response >>> ${response.message()}")
          Resource.error("An unknown error occured",null)
      }
  }catch (ex :Exception){
      Resource.error("Could not reach the server.Check your internet connection",null)
  }
}

还有这个界面，BlockIORepository.kt

interface BlockIORepository {
suspend fun getBalance(): Resource<BalanceResponse>
suspend fun insertBalance(balance: Balance)
suspend fun getCachedBalance(): Balance
suspend fun getAddresses(): Resource<DataX>
}

这是我的数据classes

data class BalanceResponse(
val balance: Balance,
val status: String

)

@Entity
data class Balance(
    val available_balance: String,
    val network: String,
    val pending_received_balance: String,
    @PrimaryKey(autoGenerate = false)
    var id: Int? = null
)

当我尝试访问 data 对象时，问题就来了。我没有为 status 对象获取空值我已经坚持了两天了。任何帮助将不胜感激。提前致谢。

Answer 1

您的 class 应按照 json 提交姓名，或者应提供 @SerializedName 所以你的 BalanceResponse class 应该是

data class BalanceResponse(
@SerializedName("data")
val balance: Balance,
@SerializedName("status")
val status: String
)

由于您试图在 balance 中保留 data，因此您必须提供 SerializedName，但如果它们具有相同的名称且大小写完全相同，那么解析器将自动识别他们。

Answer 2

问题出现在这里：

data class BalanceResponse(
   val balance: Balance,  <-- in postman it is "data"
   val status: String
)

您应该考虑为您的 class 添加 @SerializedName(xxx)。

data class BalanceResponse(
   @SerializedName("data") val balance: Balance, 
   val status: String
)

改造 returns 200 响应代码，但我在访问字段时收到空值

Retrofit returns 200 response code but I'm receiving null when accessing fields

android

mvvm

kotlin

retrofit2

dagger-hilt