get Local IP Address from NetworkInterface - Android Network

Android examples for Network:Network Operation

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Description

get Local IP Address from NetworkInterface

Demo Code


//package com.java2s;

import java.net.Inet4Address;
import java.net.InetAddress;
import java.net.NetworkInterface;
import java.net.SocketException;

import java.util.Enumeration;

import android.util.Log;

public class Main {
    private final static String P2P_INT = "p2p0";

    public static String getLocalIPAddress() {
        try {//from  ww  w.  j  a  v  a2  s .  co  m
            for (Enumeration<NetworkInterface> en = NetworkInterface
                    .getNetworkInterfaces(); en.hasMoreElements();) {
                NetworkInterface intf = en.nextElement();
                for (Enumeration<InetAddress> enumIpAddr = intf
                        .getInetAddresses(); enumIpAddr.hasMoreElements();) {
                    InetAddress inetAddress = enumIpAddr.nextElement();

                    String iface = intf.getName();
                    if (iface.matches(".*" + P2P_INT + ".*")) {
                        if (inetAddress instanceof Inet4Address) {
                            return getDottedDecimalIP(inetAddress
                                    .getAddress());
                        }
                    }
                }
            }
        } catch (SocketException ex) {
            Log.e("AndroidNetworkAddressFactory", "getLocalIPAddress()", ex);
        } catch (NullPointerException ex) {
            Log.e("AndroidNetworkAddressFactory", "getLocalIPAddress()", ex);
        }
        return null;
    }

    private static String getDottedDecimalIP(byte[] ipAddr) {
        String ipAddrStr = "";
        for (int i = 0; i < ipAddr.length; i++) {
            if (i > 0) {
                ipAddrStr += ".";
            }
            ipAddrStr += ipAddr[i] & 0xFF;
        }
        return ipAddrStr;
    }
}

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