java.net.UnknownHostException：无法解析主机没有与主机名关联的地址

Question

从后台服务和移动屏幕进行API调用时关闭。 得到了以下错误。

java.net.UnknownHostException：无法解析主机：与主机名W / System.err关联的地址：在java.net.InetAddress.lookupHostByName（InetAddress.java:424）在java.net.InetAddress.getAllByNameImpl（InetAddress.java： 236），位于com.android.okhttp.internal.Dns处的java.net.InetAddress.getAllByName（InetAddress.java:214），位于com.android.okhttp.internal.http.RouteSelector处的com.android.okhttp.internal.Dns $ 1.getAllByName（Dns.java:28）处。在com.android.okhttp.internal.http.RouteSelector.next（RouteSelector.java:122）处的resetNextInetSocketAddress（RouteSelector.java:216）在com.android.okhttp.internal.http.HttpEngine.connect（HttpEngine.java:292）处在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）处的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

如果尚未这样做，请向您的AndroidManifest.xml文件添加权限。

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

我认为这是此UnknownHostException错误消息的最常见原因。 另一个可能的原因是您的Internet连接实际上已断开。