Dummy1234 Dummy1234 - 3 years ago 116
Android Question

InetAddress in Android

How to print the IP address of a website in android ? I can run inetaddress and print it by using system.out.println() in netbean. Below is my sample coding.

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 show Unfortunately, your program has stopped.
May know is there any way to get the IP address of 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 Source

Simply,

Its your mistake on URL, Just correct it..

"www.google.com" you have 4 w's in your URL...

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

This one is correct..

addr = InetAddress.getByName("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();
   }

And this one is NetTask class..

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();
        }
    }
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