NetworkHelper.java

package com.openrobot.common;

import java.net.InetAddress;
import java.net.NetworkInterface;
import java.net.SocketException;
import java.util.Enumeration;

import android.util.Log;

public class NetworkHelper {
	
	private static String TAG = "NetworkHelper";
	
    // gets the ip address of the phone's network
    public static String getLocalIpAddress() {
        try {
            for (Enumeration<NetworkInterface> en = NetworkInterface.getNetworkInterfaces(); en.hasMoreElements();) {
                NetworkInterface intf = en.nextElement();
                for (Enumeration<InetAddress> enumIpAddr = intf.getInetAddresses(); enumIpAddr.hasMoreElements();) {
                    InetAddress inetAddress = enumIpAddr.nextElement();
                    if (!inetAddress.isLoopbackAddress()) { 
                    	return inetAddress.getHostAddress().toString(); 
                    }
                }
            }
        } catch (SocketException ex) {
            Log.d(TAG, ex.toString());
        }
        return null;
    }
}