Retrofit2 whit

Question

我试图在Kotlin中读取一个带有retrofit2的API，但是我不明白为什么它会返回一个错误。如果能帮助我理解问题所在，我将不胜感激。谢谢。

ApiResponse.kt ...

package app.macgo.api.models

data class ApiResponse(
    val bpi: Bpi,
    val chartName: String,
    val disclaimer: String,
    val time: Time
)

data class Bpi(
    val EUR: EUR,
    val GBP: GBP,
    val USD: USD
)

data class Time(
    val updated: String,
    val updatedISO: String,
    val updateduk: String
)

data class EUR(
    val code: String,
    val description: String,
    val rate: String,
    val rate_float: Double,
    val symbol: String
)

data class GBP(
    val code: String,
    val description: String,
    val rate: String,
    val rate_float: Double,
    val symbol: String
)

data class USD(
    val code: String,
    val description: String,
    val rate: String,
    val rate_float: Double,
    val symbol: String
)

..。

ApiService

..。

package app.macgo.api.models

import retrofit2.Response
import retrofit2.http.GET
import retrofit2.http.Url

interface ApiService {
    @GET
    fun getPricesByData(@Url url:String):Response<ApiResponse>
}

..。

MainActivity

..。

package app.macgo.api

import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.widget.TextView
import app.macgo.api.databinding.ActivityMainBinding
import app.macgo.api.models.ApiResponse
import app.macgo.api.models.ApiService
import kotlinx.coroutines.CoroutineScope
import kotlinx.coroutines.Dispatchers
import kotlinx.coroutines.launch
import retrofit2.Response
import retrofit2.Retrofit
import retrofit2.converter.gson.GsonConverterFactory

class MainActivity : AppCompatActivity() {
    private lateinit var binding: ActivityMainBinding
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        binding = ActivityMainBinding.inflate(layoutInflater)
        setContentView(binding.root)
        val btn = findViewById<TextView>(R.id.btn)
        btn.setOnClickListener{
            callPrice()
        }

    }
    //
    private fun getRetrofit():Retrofit{
        return Retrofit.Builder()
                .baseUrl("https://api.coindesk.com/v1/bpi/")
                .addConverterFactory(GsonConverterFactory.create())
                .build()
    }
    //
    private fun callPrice(){
        CoroutineScope(Dispatchers.IO).launch {
            val call:Response<ApiResponse> = getRetrofit().create(ApiService::class.java).getPricesByData("scurrentprice.json")
            val resultado: ApiResponse? = call.body()
            if (call.isSuccessful){
                println("RESULTADO: $resultado")
            }
        }
    }
}

..。

错误：

E/AndroidRuntime:致命异常:DefaultDispatcher-worker进程: app.macgo.api，PID: 11571 java.lang.IllegalArgumentException:无法为位于retrofit2.HttpServiceMethod.createCallAdapter(HttpServiceMethod.java:116) at retrofit2.HttpServiceMethod.parseAnnotations(HttpServiceMethod.java:67) at retrofit2.ServiceMethod.parseAnnotations(ServiceMethod.java:39) at retrofit2.Retrofit.loadServiceMethod(Retrofit.java:202) at retrofit2.Retrofit$1.invoke(Retrofit.java:160) at java.lang.reflect.Proxy.invoke的方法ApiService.getPricesByData at retrofit2.Utils.methodError(Utils.java:54)创建retrofit2.Response调用适配器(app.macgo.api.MainActivity$callPrice$1.invokeSuspend(MainActivity.kt:38) at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:33) at kotlinx.coroutines.DispatchedTask.run(DispatchedTask.kt:56) at kotlinx.coroutines.scheduling.CoroutineScheduler.runSafely(CoroutineScheduler.kt:571) at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.executeTask(CoroutineScheduler.kt:738) at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.runWorker(CoroutineScheduler.kt:678) at kotlinx.coroutines的Proxy.java:1006) $Proxy1.getPricesByData(未知来源).scheduling.CoroutineScheduler$Worker.run(CoroutineScheduler.kt:665)原因: retrofit2.Response.的java.lang.IllegalArgumentException:找不到调用适配器已尝试：* retrofit2.DefaultCallAdapterFactory 2.CompletableFutureCallAdapterFactory*Retrofit2.DefaultCallAdapterFactory at retrofit2.Retrofit.callAdapter(Retrofit.java:237) at retrofit2.HttpServiceMethod.createCallAdapter(HttpServiceMethod.java:114) ... 13更多

Answer 1

在普通的翻新界面中，使用Call而不是Response作为包装类型。

也就是说，改变

fun getPricesByData(@Url url:String):Response<ApiResponse>

至

fun getPricesByData(@Url url:String):Call<ApiResponse>