我遇到此错误 java.lang.IllegalArgumentException：无法找到 class java.lang.Object 的调用适配器

Question

我是 kotlin 中 MVVM 的新手，我想使用改造获取一些数据并在 textview 中显示它，但我无法获取它。第一次在这个应用程序中，我使用了 android 喷气背包组件。我尝试了很多次，但无法解决此错误。我的代码在下面

MainActivity.kt

override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    setContentView(R.layout.activity_main)

    val repository = Repository()
    val viewModelFactory = MainViewModelFactory(repository)
    viewModel = ViewModelProvider(this, viewModelFactory).get(MainViewModel::class.java)
    viewModel.getEmployeeData()

    viewModel.repoResponse.observe(this, Observer { response ->
        if (response.isSuccessful) {
            Log.d("Response", response.body()?.employee_id.toString())
            Log.d("Response", response.body()?.employee_name.toString())
            Log.d("Response", response.body()?.employee_age.toString())
            Log.d("Response", response.body()?.employee_salary.toString())

            name.text = response.body()?.employee_name!!

        } else {
            Log.d("Response", response.errorBody().toString())
            name.text = response.code().toString()
        }
    })
}

MainViewModelFactory.kt

class MainViewModelFactory(private val repository: Repository):ViewModelProvider.Factory {
override fun <T : ViewModel?> create(modelClass: Class<T>): T {
    return MainViewModel(repository) as T
}

MainViewModel.kt

class MainViewModel(private val repository: Repository):ViewModel() {
val repoResponse:MutableLiveData<Response<Employee>> = MutableLiveData()
fun getEmployeeData(){
    viewModelScope.launch {
        val response = repository.getEmployeeData()
        repoResponse.value = response
    }
}

ApiClient.kt

object ApiClient {
private val retrofit by lazy{
    Retrofit.Builder()
        .baseUrl(BASE_URL)
        .addConverterFactory(GsonConverterFactory.create())
        .build()
}

val api:Api by lazy {
    retrofit.create(Api::class.java)
}

Api.kt

public interface Api {

@GET("api/v1/employee/1")
suspend fun getEmployeeData():Response<Employee>
}

Repository.kt

class Repository {
suspend fun getEmployeeData():Response<Employee>{
    return ApiClient.api.getEmployeeData()
}

Employee.kt

data class Employee(
@SerializedName("id")
var employee_id: Int,
@SerializedName("employee_name")
var employee_name: String,
@SerializedName("employee_age")
var employee_age: Int,
@SerializedName("employee_salary")
var employee_salary: Int
)

Constants.kt

class Constants {
companion object{
    const val BASE_URL = "http://dummy.restapiexample.com"
}

错误图片

我该如何解决这个问题？请帮我。谢谢

Answer 1

Retrofit 从 2.6.4 开始只支持 suspend 关键字，因此使用 2.3.0 将不起作用。

您应该更新到更新版本的 Retrofit。撰写本文时的当前最新版本是 2.9.0。

我遇到此错误 java.lang.IllegalArgumentException：无法找到 class java.lang.Object 的调用适配器

I face this error java.lang.IllegalArgumentException: Could not locate call adapter for class java.lang.Object

android-studio

android-mvvm

android-livedata

kotlin-coroutines

android-jetpack-compose