Question

如何在安伯网站印刷IP地址? 我可以使用<代码>InetAddress,并在网上使用<编码>systemout.println()。以下是我的样本编码:

public String getHostAddress () {
        InetAddress addr=null;
        try {
            addr= InetAddress.getByName("www.google.com");
        }
            
        catch (UnknownHostException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
            }
        return addr.getHostAddress();
    }

It always shows "Unfortunately, your program has stopped."
May I know is there any way to get the IP address of the visited website in Android?

05-19 14:22:39.008: I/dalvikvm(1062): threadid=3: reacting to signal 3
05-19 14:22:39.049: I/dalvikvm(1062): Wrote stack traces to  /data/anr/traces.txt 
05-19 14:22:39.688: I/dalvikvm(1062): threadid=3: reacting to signal 3
05-19 14:22:39.828: I/dalvikvm(1062): Wrote stack traces to  /data/anr/traces.txt 
05-19 14:22:39.929: D/AndroidRuntime(1062): Shutting down VM
05-19 14:22:39.948: W/dalvikvm(1062): threadid=1: thread exiting with uncaught exception (group=0x409c01f8)
05-19 14:22:40.039: E/AndroidRuntime(1062): FATAL EXCEPTION: main
05-19 14:22:40.039: E/AndroidRuntime(1062): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.android.destinationurl/com.android.destinationurl.DestinationURL}: android.os.NetworkOnMainThreadException
05-19 14:22:40.039: E/AndroidRuntime(1062):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1956)
05-19 14:22:40.039: E/AndroidRuntime(1062):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1981)
05-19 14:22:40.039: E/AndroidRuntime(1062):     at android.app.ActivityThread.access$600(ActivityThread.java:123)
05-19 14:22:40.039: E/AndroidRuntime(1062):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1147)
05-19 14:22:40.039: E/AndroidRuntime(1062):     at android.os.Handler.dispatchMessage(Handler.java:99)
05-19 14:22:40.039: E/AndroidRuntime(1062):     at android.os.Looper.loop(Looper.java:137)
05-19 14:22:40.039: E/AndroidRuntime(1062):     at android.app.ActivityThread.main(ActivityThread.java:4424)
05-19 14:22:40.039: E/AndroidRuntime(1062):     at java.lang.reflect.Method.invokeNative(Native Method)
05-19 14:22:40.039: E/AndroidRuntime(1062):     at java.lang.reflect.Method.invoke(Method.java:511)
05-19 14:22:40.039: E/AndroidRuntime(1062):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
05-19 14:22:40.039: E/AndroidRuntime(1062):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
05-19 14:22:40.039: E/AndroidRuntime(1062):     at dalvik.system.NativeStart.main(Native Method)
05-19 14:22:40.039: E/AndroidRuntime(1062): Caused by: android.os.NetworkOnMainThreadException
05-19 14:22:40.039: E/AndroidRuntime(1062):     at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1099)
05-19 14:22:40.039: E/AndroidRuntime(1062):     at java.net.InetAddress.lookupHostByName(InetAddress.java:391)
05-19 14:22:40.039: E/AndroidRuntime(1062):     at java.net.InetAddress.getAllByNameImpl(InetAddress.java:242)
05-19 14:22:40.039: E/AndroidRuntime(1062):     at java.net.InetAddress.getByName(InetAddress.java:295)
05-19 14:22:40.039: E/AndroidRuntime(1062):     at com.android.destinationurl.DestinationURL.getHostAddress(DestinationURL.java:57)
05-19 14:22:40.039: E/AndroidRuntime(1062):     at com.android.destinationurl.DestinationURL.onCreate(DestinationURL.java:40)
05-19 14:22:40.039: E/AndroidRuntime(1062):     at android.app.Activity.performCreate(Activity.java:4465)
05-19 14:22:40.039: E/AndroidRuntime(1062):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049)
05-19 14:22:40.039: E/AndroidRuntime(1062):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1920)
05-19 14:22:40.039: E/AndroidRuntime(1062):     ... 11 more
05-19 14:22:40.248: I/dalvikvm(1062): threadid=3: reacting to signal 3
05-19 14:22:40.283: I/dalvikvm(1062): Wrote stack traces to  /data/anr/traces.txt 
05-19 14:22:40.608: I/dalvikvm(1062): threadid=3: reacting to signal 3
05-19 14:22:40.698: I/dalvikvm(1062): Wrote stack traces to  /data/anr/traces.txt 
05-19 14:22:42.078: I/Process(1062): Sending signal. PID: 1062 SIG: 9

Answer 1

简而言之,

阁下对URL的错误是正确的。

www.google.com>, 您的URL.

And add Use-Permission <uses-permission android:name="android.permission.INTERNET"> in manifest file of your android application..

这是正确的。

http://www.google.com;。

EDIT: Use AsyncTask for Network Operation

String netAddress = null;
 try
  {
   netAddress = new NetTask().execute("www.google.com").get();
  }
  catch (Exception e1)
   {
    e1.printStackTrace();
   }

其中一个是NetTask。

public class NetTask extends AsyncTask<String, Integer, String>
    {
        @Override
        protected String doInBackground(String... params)
        {
            InetAddress addr = null;
            try
            {
                addr = InetAddress.getByName(params[0]);
            }

            catch (UnknownHostException e)
            {
                            e.printStackTrace();
            }
            return addr.getHostAddress();
        }
    }

Answer 2

你错误地用wwww.google.com进入URL。

addr= InetAddress.getByName("www.google.com");

After correction it worked.

Answer 3

确保你获得所需的一切许可。或许你的申请因没有适当的许可而停止。如果你在XML表中获得互联网接入许可,进行检查。

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

Answer 4

这是因为你正在把网络引向主线。

String address = "";
AsyncTask.execute(new Runnable() {
    @Override
    public void run() {
        address = InetAddress.getByName("www.google.com");
    }
});

友情链接