E/AndroidRuntime：致命异常：main 和 Coroutine，Retrofit2

Question

我刚开始学习kotlin，我的第一个应用使用了Retrofit2和Coroutine，但是有问题。我有一些错误，但是协程的堆栈跟踪信息非常少。也许有人会发现错误或知道热点以使堆栈跟踪提供更多信息。

API服务：

const val API_KEY = "Bcae2032bb596c73b10bdab625c037da"

interface CurrencyApi {

//https://api.currencystack.io/currency?base=USD&target=EUR&apikey=Bcae2032bb596c73b10bdab625c037da

@GET("currency")
fun getCurrentCurrency(
    @Query("base") base: String,
    @Query("target") target: String
): Deferred<Currency>

companion object {
    operator fun invoke(): CurrencyApi {
        val requestInterceptor = Interceptor { chain ->

            val url = chain.request()
                .url()
                .newBuilder()
                .addQueryParameter("key", API_KEY)
                .build()
            val request = chain.request()
                .newBuilder()
                .url(url)
                .build()

            return@Interceptor chain.proceed(request)
        }

        val okHttpClient = OkHttpClient.Builder()
            .addInterceptor(requestInterceptor)
            .build()

        return Retrofit.Builder()
            .client(okHttpClient)
            .baseUrl("https://api.currencystack.io/")
            .addCallAdapterFactory(CoroutineCallAdapterFactory())
            .addConverterFactory(GsonConverterFactory.create())
            .build()
            .create(CurrencyApi::class.java)
    }
}

Activity:

 class MainActivity : AppCompatActivity(), AdapterView.OnItemSelectedListener {


override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    val binding: ActivityMainBinding = DataBindingUtil.setContentView(this, R.layout.activity_main)
    val model = ViewModelProviders.of(this).get(MainViewModel::class.java)

    val apiService = CurrencyApi()

    GlobalScope.launch(Dispatchers.Main) {
        val currency = apiService.getCurrentCurrency("PLN", "EUR").await()
        return@launch try {
            text_view_test.text = currency.toString()
        } catch (e: Exception) {

        }
    }

Logcat:

E/AndroidRuntime: FATAL EXCEPTION: main Process: com.example.daniellachacz.currencyconverter, PID: 10924 retrofit2.HttpException: HTTP 400 at com.jakewharton.retrofit2.adapter.kotlin.coroutines.CoroutineCallAdapterFactory$BodyCallAdapter$adapt.onResponse(CoroutineCallAdapterFactory.kt:104) at retrofit2.OkHttpCall.onResponse(OkHttpCall.java:123) at okhttp3.RealCall$AsyncCall.execute(RealCall.java:153) at okhttp3.internal.NamedRunnable.run(NamedRunnable.java:32) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1113) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:588) at java.lang.Thread.run(Thread.java:818)

Answer 1

您收到服务器错误 400 Bad Request 响应。此状态代码表示由于语法无效，服务器无法理解请求。尝试调试或放置一些日志，看看您真正发送到服务器的内容。我认为调试的好地方是 Interceptor 接口的实现。

Answer 2

如@Sergey 所说，这是服务器错误。

在我的例子中，它无法被 API 捕获，服务器写道：An internal server error occurred.（代码 500）而不是 JSON。

Answer 3

将@GET(currency)替换为@GET(currency.json)

E/AndroidRuntime：致命异常：main 和 Coroutine，Retrofit2

E/AndroidRuntime: FATAL EXCEPTION: main and Coroutine, Retrofit2

android

coroutine

kotlin

retrofit2

kotlin-coroutines