LJava/NET/URL类中没有字段主机

Question

E/AndroidRuntime: FATAL EXCEPTION: AsyncTask #1
    Process: com.example.corentin.myapplication, PID: 3168
    java.lang.RuntimeException: An error occurred while executing doInBackground()
        at android.os.AsyncTask$3.done(AsyncTask.java:354)
        at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:383)
        at java.util.concurrent.FutureTask.setException(FutureTask.java:252)
        at java.util.concurrent.FutureTask.run(FutureTask.java:271)
        at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:245)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641)
        at java.lang.Thread.run(Thread.java:764)
     Caused by: java.lang.NoSuchFieldException: No field host in class Ljava/net/URL; (declaration of 'java.net.URL' appears in /system/framework/core-oj.jar)
        at java.lang.Class.getDeclaredField(Native Method)
        at khttp.requests.GenericRequest.toIDN(GenericRequest.kt:193)
        at khttp.requests.GenericRequest.makeRoute(GenericRequest.kt:198)
        at khttp.requests.GenericRequest.<init>(GenericRequest.kt:128)
        at khttp.KHttp.request(KHttp.kt:58)
        at khttp.KHttp.get(KHttp.kt:28)
        at khttp.KHttp.get$default(KHttp.kt:27)
        at com.example.corentin.myapplication.InfoUser.run(InfoUser.kt:29)
        at com.example.corentin.myapplication.InfoUser$onCreate$1.invoke(InfoUser.kt:23)
        at com.example.corentin.myapplication.InfoUser$onCreate$1.invoke(InfoUser.kt:16)
        at com.example.corentin.myapplication.doAsync.doInBackground(InfoUser.kt:11)
        at com.example.corentin.myapplication.doAsync.doInBackground(InfoUser.kt:9)
        at android.os.AsyncTask$2.call(AsyncTask.java:333)
        at java.util.concurrent.FutureTask.run(FutureTask.java:266)
        at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:245) 
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167) 
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641) 
        at java.lang.Thread.run(Thread.java:764) 

class doAsync(val handler: () -> Unit) : AsyncTask<Void, Void, Void>() {
    override fun doInBackground(vararg params: Void?): Void? {
        handler()
        return null
    }
}

class InfoUser : AppCompatActivity() {

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

        doAsync {
            run("https://api.imgur.com/3/account/xcoco55?client_id=CLIENT ID")
        }.execute()
    }


    fun run(url: String) {
        val response  = khttp.get(url)

        println("Coucou")
        if (response.statusCode == 200) {
            runOnUiThread {textView.text = response.text}
        }
    }
}

当我删除val response=khttp.get(url)行时，或者当我在手机（Android Oreo 8.1）上启动应用程序时，一切都运行良好。

你认为这个错误是来自Android9.0还是来自模拟器？

Answer 1

免责声明：我是通过以下请求被提到这篇文章的。

这是一个问题，当您的目标是Android9.0时，就会遇到，正如@Torben Kohlmeier所提到的，因为该字段不再可以访问。

您可以将模块build.gradle中的khttp实现替换为以下内容，这将按预期工作。