java - Android 应用程序中的 UnknownHostException 警告

Question

我正在开发一个 Android 应用程序，它使用 Web 服务并调用 API 来发送请求并获取响应。

我的应用程序之前工作正常，但现在当我启动应用程序并尝试登录(应用程序的第一页)时，会显示以下警告和异常

我的应用程序代码行是:

SoapObject request = new SoapObject(NAMESPACE, METHOD_NAME);
        request.addProperty("requestXml", envelope1);
        SoapSerializationEnvelope envelope = new SoapSerializationEnvelope(
                SoapEnvelope.VER11);
        envelope.setOutputSoapObject(request);
        HttpTransportSE androidHttpTransport = new HttpTransportSE(URL);
        Object response = null;
        try {
            androidHttpTransport.call(SOAP_ACTION, envelope);
            response = envelope.getResponse();
            authenticationLoginResponse = response.toString();
        } catch (Exception e) {
            e.printStackTrace();
        }

我在以下行收到警告:

androidHttpTransport.call(SOAP_ACTION, 信封);

完整的警告日志是:

05-28 17:09:06.819: W/System.err(1771): java.net.UnknownHostException: capsconnect.phasestreamtest.com
05-28 17:09:06.822: W/System.err(1771):     at java.net.InetAddress.lookupHostByName(InetAddress.java:506)
05-28 17:09:06.832: W/System.err(1771):     at java.net.InetAddress.getAllByNameImpl(InetAddress.java:294)
05-28 17:09:06.832: W/System.err(1771):     at java.net.InetAddress.getAllByName(InetAddress.java:256)
05-28 17:09:06.832: W/System.err(1771):     at org.apache.harmony.luni.internal.net.www.protocol.http.HttpConnection.<init>(HttpConnection.java:69)
05-28 17:09:06.832: W/System.err(1771):     at org.apache.harmony.luni.internal.net.www.protocol.http.HttpConnection.<init>(HttpConnection.java:48)
05-28 17:09:06.832: W/System.err(1771):     at org.apache.harmony.luni.internal.net.www.protocol.http.HttpConnection$Address.connect(HttpConnection.java:322)
05-28 17:09:06.842: W/System.err(1771):     at org.apache.harmony.luni.internal.net.www.protocol.http.HttpConnectionPool.get(HttpConnectionPool.java:89)
05-28 17:09:06.842: W/System.err(1771):     at org.apache.harmony.luni.internal.net.www.protocol.http.HttpURLConnectionImpl.getHttpConnection(HttpURLConnectionImpl.java:285)
05-28 17:09:06.853: W/System.err(1771):     at org.apache.harmony.luni.internal.net.www.protocol.http.HttpURLConnectionImpl.makeConnection(HttpURLConnectionImpl.java:267)
05-28 17:09:06.853: W/System.err(1771):     at org.apache.harmony.luni.internal.net.www.protocol.http.HttpURLConnectionImpl.connect(HttpURLConnectionImpl.java:205)
05-28 17:09:06.853: W/System.err(1771):     at org.ksoap2.transport.ServiceConnectionSE.connect(ServiceConnectionSE.java:76)
05-28 17:09:06.853: W/System.err(1771):     at org.ksoap2.transport.HttpTransportSE.call(HttpTransportSE.java:152)
05-28 17:09:06.853: W/System.err(1771):     at org.ksoap2.transport.HttpTransportSE.call(HttpTransportSE.java:95)
05-28 17:09:06.853: W/System.err(1771):     at commerce.app.lib.login.LoginScreen.performBackgroundProcess(LoginScreen.java:273)
05-28 17:09:06.862: W/System.err(1771):     at commerce.app.lib.login.LoginScreen.access$2(LoginScreen.java:233)
05-28 17:09:06.862: W/System.err(1771):     at commerce.app.lib.login.LoginScreen$1$1.run(LoginScreen.java:219)
05-28 17:09:06.862: W/System.err(1771): java.lang.NullPointerException
05-28 17:09:06.862: W/System.err(1771):     at java.io.StringReader.<init>(StringReader.java:46)
05-28 17:09:06.872: W/System.err(1771):     at commerce.app.lib.login.LoginScreen.performBackgroundProcess(LoginScreen.java:285)
05-28 17:09:06.872: W/System.err(1771):     at commerce.app.lib.login.LoginScreen.access$2(LoginScreen.java:233)
05-28 17:09:06.872: W/System.err(1771):     at commerce.app.lib.login.LoginScreen$1$1.run(LoginScreen.java:219)

任何人都可以建议为什么在该项目几天前运行良好的情况下现在会出现此错误吗？

Answer 1

抛出UnknownHostException表示无法确定主机的IP地址。因此，请检查连接问题或是否可以访问服务器。