Java tutorial
//package com.java2s; import java.net.InetAddress; import java.net.UnknownHostException; import android.content.Context; import android.net.DhcpInfo; import android.net.wifi.WifiManager; import android.widget.Toast; public class Main { public static String getDhcpIpString(Context mContext) { WifiManager mWifiManager; String broadcastIp = null; mWifiManager = (WifiManager) mContext.getSystemService(Context.WIFI_SERVICE); if (mWifiManager.isWifiEnabled()) { DhcpInfo myDhcpInfo = mWifiManager.getDhcpInfo(); if (myDhcpInfo == null) { Toast.makeText(mContext, "can not get dhcp info", Toast.LENGTH_SHORT).show(); return null; } else { try { broadcastIp = getBroadcastAddress(myDhcpInfo).getHostAddress(); } catch (UnknownHostException e) { // TODO Auto-generated catch block e.printStackTrace(); return null; } } return broadcastIp; } return null; } private static InetAddress getBroadcastAddress(DhcpInfo mDhcpInfo) throws UnknownHostException { int broadcast = (mDhcpInfo.ipAddress & mDhcpInfo.netmask) | ~mDhcpInfo.netmask; byte[] quads = new byte[4]; try { for (int k = 0; k < 4; k++) quads[k] = (byte) ((broadcast >> k * 8) & 0xFF); } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } return InetAddress.getByAddress(quads); } }