java.net.UnknownHostException：無法解析主機沒有與主機名關聯的地址

Question

從后台服務和移動屏幕進行API調用時關閉。 得到了以下錯誤。

java.net.UnknownHostException：無法解析主機：與主機名W / System.err關聯的地址：在java.net.InetAddress.lookupHostByName（InetAddress.java:424）在java.net.InetAddress.getAllByNameImpl（InetAddress.java： 236），位於com.android.okhttp.internal.Dns處的java.net.InetAddress.getAllByName（InetAddress.java:214），位於com.android.okhttp.internal.http.RouteSelector處的com.android.okhttp.internal.Dns $ 1.getAllByName（Dns.java:28）處。在com.android.okhttp.internal.http.RouteSelector.next（RouteSelector.java:122）處的resetNextInetSocketAddress（RouteSelector.java:216）在com.android.okhttp.internal.http.HttpEngine.connect（HttpEngine.java:292）處在com.android.okhttp.internal.http.HttpEngine.sendSocketRequest（HttpEngine.java:255）在com.android.okhttp.internal.http.HttpEngine.sendRequest（HttpEngine.java:206）在com.android.okhttp.internal com.android.okhttp.internal.http.HttpURLConnectionImpl.connect（HttpURLConnectionImpl.java:89）處的com.android.okhttp.internal.http.HttpURLConnectionImpl.execute（HttpURLConnectionImpl.java:345） .http.HttpsURLConnectionImpl.connect（HttpsURLConnectionImpl.java:161）

  When API call from background service and mobile screen is off. Got the following error. java.net.UnknownHostException: Unable to resolve host "": No address associated with hostname W/System.err: at java.net.InetAddress.lookupHostByName(InetAddress.java:424) at java.net.InetAddress.getAllByNameImpl(InetAddress.java:236) at java.net.InetAddress.getAllByName(InetAddress.java:214) at com.android.okhttp.internal.Dns$1.getAllByName(Dns.java:28) at com.android.okhttp.internal.http.RouteSelector.resetNextInetSocketAddress(RouteSelector.java:216) at com.android.okhttp.internal.http.RouteSelector.next(RouteSelector.java:122) at com.android.okhttp.internal.http.HttpEngine.connect(HttpEngine.java:292) at com.android.okhttp.internal.http.HttpEngine.sendSocketRequest(HttpEngine.java:255) at com.android.okhttp.internal.http.HttpEngine.sendRequest(HttpEngine.java:206) at com.android.okhttp.internal.http.HttpURLConnectionImpl.execute(HttpURLConnectionImpl.java:345) at com.android.okhttp.internal.http.HttpURLConnectionImpl.connect(HttpURLConnectionImpl.java:89) at com.android.okhttp.internal.http.HttpsURLConnectionImpl.connect(HttpsURLConnectionImpl.java:161) 

Answer 1

如果尚未這樣做，請向您的AndroidManifest.xml文件添加權限。

<uses-permission android:name="android.permission.INTERNET" />

我認為這是此UnknownHostException錯誤消息的最常見原因。 另一個可能的原因是您的Internet連接實際上已斷開。