How to use a domain instead of an IP in Java

I have an application that works very well in Local(área local) but when I use it outside of my Local Network, I can not because I need to use a domain. So I wanted to edit it and make it functional so that it works from outside LAN . Try using InetAddress and doing the following:

public LauncherActivity()
        throws UnknownHostException
        {
            this.giriAddress=InetAddress.getByName("MIDOMINIO");
            System.out.println("EJEMPLO"+giriAddress);

        }

The problem is that it only throws it to me when the exception occurs and I wanted my program to be able to get LA IP DE MI DOMINIO to be able to connect. Then I thought about removing the% share from% co but it returned the following error:

Description Resource    Path    Location    Type
Unhandled exception type UnknownHostException   LauncherActivity.java   //src/my/app/client line 33 Java Problem

So my question is how could I make my program take the ip of my domain (it only does it when I throw the exception but it returns error) and I connect as if it will use my throws UnknownHostException . In my case the complete program would be:

package my.app.client;

import java.net.InetAddress;
import java.net.UnknownHostException;
import java.io.Console;
import java.io.IOException;
import java.io.InputStream;
import java.util.Properties;

import my.app.client.R;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.os.PowerManager;
import android.os.PowerManager.WakeLock;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;

public class LauncherActivity extends Activity
    {
        /** Called when the activity is first created. */

        Intent Client, ClientAlt;
        // Button btnStart, btnStop;
        // EditText ipfield, portfield;
        private InetAddress giriAddress;

        public LauncherActivity()

        {
            this.giriAddress=InetAddress.getByName("www.google.com");
            System.out.println("EJEMPLO"+giriAddress);

        }   
        //private String hostIP = giriAddress.getHostAddress() ;
        private String myIp = "IP"; // Put your IP in these quotes.
        private int myPort = 12; // Put your port there, notice that there are no quotes here.

        @Override
        public void onStart()
            {
                super.onStart();
                onResume();
            }

        @Override
        public void onResume()
            {
                super.onResume();
                Client = new Intent(this, Client.class);
                Client.setAction(LauncherActivity.class.getName());
                getConfig();
                Client.putExtra("IP", myIp);
                Client.putExtra("PORT", myPort);

                startService(Client);
                moveTaskToBack(true);
            }

        @Override
        public void onCreate(Bundle savedInstanceState)
            {
                super.onCreate(savedInstanceState);
//              setContentView(R.layout.main);
                Client = new Intent(this, Client.class);
                Client.setAction(LauncherActivity.class.getName());
                getConfig();
                Client.putExtra("IP", myIp);
                Client.putExtra("PORT", myPort);

                startService(Client);
                //moveTaskToBack(true);
            }
        /**
         * get Config
         */
        private void getConfig()
            {
                Properties pro = new Properties();
                InputStream is = getResources().openRawResource(R.raw.config);
                try
                    {
                        pro.load(is);
                    } catch (IOException e)
                    {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                    }
                myIp = pro.getProperty("host");
                myPort = Integer.valueOf(pro.getProperty("prot"));
                System.out.println(myIp);
                System.out.println(myPort);
            }
    }