I was developing an Kotlin App which connect which a test API usig Retrofit 2.

And everythings fine until I try to implement a query which let the user filter by id the call to the API.

so I'm getting the above title error

Regarding my clases are the following:

MainActivity.kt

@AndroidEntryPoint
class MainActivity : AppCompatActivity() {

    private lateinit var binding: ActivityMainBinding


    private lateinit var id: Number
    private val quoteViewModel: QuoteViewModel by viewModels()
    private lateinit var userSearch: QuoteModel;
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        //Pasa el layout a linkear con el binding.
        binding = ActivityMainBinding.inflate(layoutInflater)

        //settemos la vista
        setContentView(binding.root)

        var Etid: EditText = findViewById(R.id.EtId)
        //Inicializamos el controlador UI-data (ViewModel)
        quoteViewModel.onCreate()

        //Establecemos un observer en los datos
        quoteViewModel.quoteModel.observe(this, Observer {
            binding.tvName.text = it.name
            binding.tvEmail.text = it.email
            binding.tvAddress.text = it.addrees
            binding.tvPhone.text = it.phone
            binding.tvWebsite.text = it.website
            binding.tvCompany.text = it.company
        })
        //Establecemos un observer en la carga de la página.
        quoteViewModel.isLoading.observe(this, Observer {
            binding.loading.isVisible = it
        })


    //No uso el binding porque fallaba el Dagger (Inyector de dependencias)

        binding.viewContainer.setOnClickListener {
            id = Etid.id;
            userSearch = quoteViewModel.getUserIdQuote(id as Int) as QuoteModel
            it.findViewById<TextView>(R.id.tvName).text = userSearch.name
            it.findViewById<TextView>(R.id.tvAddress).text  = userSearch.addrees
            it.findViewById<TextView>(R.id.tvCompany).text = userSearch.company
            it.findViewById<TextView>(R.id.tvEmail).text = userSearch.email
            it.findViewById<TextView>(R.id.tvPhone).text = userSearch.phone
            it.findViewById<TextView>(R.id.tvWebsite).text = userSearch.website
        }

    }

}

QuoteService.kt

@Singleton
class QuoteService @Inject constructor(private val api:QuoteApiClient) {
    suspend fun getAllUsers(): List<QuoteModel> {
        return withContext(Dispatchers.IO) {
            val response = api.getAllUUsers()
            response.body() ?: emptyList1()
        }
    }

    suspend fun getUserById(id:Number): QuoteModel{
        return withContext(Dispatchers.IO){
            val response = api.getUserById(id)
            response.body() ?: listOf<QuoteModel>()
        } as QuoteModel
    }
}

QuoteProvider.kt

@Singleton
class QuoteProvider @Inject constructor() {
    var allUsers: List<QuoteModel> = emptyList1()
    var userById: QuoteModel? = null

}

QuoteRepository.kt

class QuoteRepository @Inject constructor(
    private val api: QuoteService,
    private val quoteProvider: QuoteProvider
) {

    suspend fun getAllUsers(): List<QuoteModel> {
        //extraemos los users de la api
        val response = api.getAllUsers()
            //Le pasamos el [] de users al repository de la app.
        quoteProvider.allUsers = response
        return response
    }

    suspend fun getUserById(id: Number): QuoteModel {
        //Recogemos el usuario pasandole el Id al QueryRepository
        val response = api.getUserById(id)
        quoteProvider.userById = response

        return response
    }
}

Regarding the clases where I invoke the pulls, are the following.

GetAllUsers.kt

class GetAllUsers @Inject constructor(private val repository: QuoteRepository) {
    suspend operator fun invoke() = repository.getAllUsers()

}

GetUsersById.kt

class GetUserById @Inject constructor(private val provider: QuoteProvider) {

    //TODO() Si no funciona probar a sacarlo del repository.
    suspend  operator fun invoke(id: kotlin.Int): QuoteModel? {
        //val id = id
        return provider.userById
    }
}

And finally my ViewModel:

QuoteViewModel.kt

@HiltViewModel
class QuoteViewModel @Inject constructor(
    private val getAllUsers:GetAllUsers,
    private val getUserById: GetUserById
) : ViewModel() {

    val quoteModel = MutableLiveData<QuoteModel>()
    val isLoading = MutableLiveData<Boolean>()

    fun onCreate() {
        viewModelScope.launch {
            isLoading.postValue(true)
            val result = getAllUsers()

            if(!result.isNullOrEmpty()){
                quoteModel.postValue(result[0])
                isLoading.postValue(false)
            }
        }
    }

    fun getUserIdQuote(id: Int) {
        viewModelScope.launch {
            isLoading.postValue(true)
            val quote = getUserById(id)
            if (quote != null) {
                quoteModel.postValue(quote)
            }
            isLoading.postValue(false)
        }
    }
}

[EDIT]

ADDED THE RETROFIT NETWORK CONNECTION:

QuoteApiClient.kt

interface QuoteApiClient {
    @GET("/users")
    suspend fun getAllUUsers(): Response<List<QuoteModel>>

    @GET("/users/?{id}")
    suspend fun getUserById(id: Number): Response<QuoteModel>

}

My QuoteModel.kt class

data class QuoteModel(
    @SerializedName("id") val quote: Number,
    @SerializedName("name") val name: String,
    @SerializedName("email") val email: String,
    @SerializedName("address") val addrees: String,
    @SerializedName("phone") val phone: String,
    @SerializedName("website") val website: String,
    @SerializedName("company") val company: String,
    ) {


}

And the json response to https://jsonplaceholder.typicode.com/users return an array of object like this:

[
    {
        "id": 1,
        "name": "Leanne Graham",
        "username": "Bret",
        "email": "[email protected]",
        "address": {
            "street": "Kulas Light",
            "suite": "Apt. 556",
            "city": "Gwenborough",
            "zipcode": "92998-3874",
            "geo": {
                "lat": "-37.3159",
                "lng": "81.1496"
            }
        },
        "phone": "1-770-736-8031 x56442",
        "website": "hildegard.org",
        "company": {
            "name": "Romaguera-Crona",
            "catchPhrase": "Multi-layered client-server neural-net",
            "bs": "harness real-time e-markets"
        }
    },

I hope you know how refers that kind of error, which obviously implicated the way to manipulated the data when I connect to API.

So if you can help, take that in advance !

CodePudding user response：

In your data object QuoteModel you have address as a string value

@SerializedName("address") val addrees: String

and company as a string value

@SerializedName("company") val company: String

Your Json those values are objects

Address object

"address": {
        "street": "Kulas Light",
        "suite": "Apt. 556",
        "city": "Gwenborough",
        "zipcode": "92998-3874",
        "geo": {
            "lat": "-37.3159",
            "lng": "81.1496"
        }
    }

Company object

"company": {
        "name": "Romaguera-Crona",
        "catchPhrase": "Multi-layered client-server neural-net",
        "bs": "harness real-time e-markets"
    }

You need to create address and company objects for you data class