/**

    * 獲取本地 ip

    *@return

    */

    public String getLocalIpAddress(){

        try{

            String ipv4=null;

            // 取得機器所有網路介面

            List<NetworkInterface> nilist= Collections.list(NetworkInterface.getNetworkInterfaces());

            for(NetworkInterface ni:nilist){

                // 取得網卡所有的 IP 地址

                List<InetAddress>ialist=Collections.list(ni.getInetAddresses());

                for(InetAddress address:ialist){

                    // 只取 IPv4 地址

                    ipv4=address.getHostAddress();

                                        if(!address.isLoopbackAddress() && address instanceof Inet4Address){

                        return ipv4;

                    }

                }

            }

        }catch(SocketException ex){

            Log.e(TAG, ex.toString());

        }

                return"0.0.0.0";

    }

    /**

    *通過本地 ip 獲取 mac 地址

*通過 ip 獲取的 mac 地址, 所以當是 wifi 連線時的 ip 獲取到的則是 WIFI 的 mac，如果是*Ethernet 連線時則獲取的是 Ethernet 的 mac 地址

    *@return

    */

    public String getLocalMacAddressFromIp(){

        String mac_s="";

        try{

            byte[]mac;

            // 獲取本地 IP

            String ip=getLocalIpAddress();

            // 取得網卡

            InetAddress ipAddress=InetAddress.getByName(ip);

            if(ipAddress==null){

                return mac_s;

            }

            // 只取 IPv4 地址

            if(!(ipAddress instanceof Inet4Address)){

                 return mac_s;

            }

            // 取 MAC

            NetworkInterface ne=NetworkInterface.getByInetAddress(ipAddress);

            mac=ne.getHardwareAddress();

                if(mac.length>0){

                    mac_s=byte2mac(mac);

                }

        }catch(Exception e){

            e.printStackTrace();

        }finally{

            return mac_s;

        }

    }

    // 轉為 MAC 文字

    private String byte2mac(byte[]b){

        StringBuffer hs=new StringBuffer(b.length);

        String stmp="";

        int len=b.length;

        for(int n=0;n<len;n++){

            stmp=Integer.toHexString(b[n]&0xFF);

            if(stmp.length()==1){

                hs=hs.append("0").append(stmp);

            }else{

                hs=hs.append(stmp);

            }

        }

        StringBuffer str=new StringBuffer(hs);

        for(int i=0;i<str.length();i++){

            if(i%3==0){

                str.insert(i,":");

            }

        }

        return str.toString().substring(1);

    }

    /**

    *獲取 Ethernet 的 MAC 地址

    *@return

    */

        private String getWireMac(){

                String strMacAddress = null;

                try {

                        // 取得網卡 MAC

            byte[] b = NetworkInterface.getByName("eth0")

                                        .getHardwareAddress();

                        strMacAddress = byte2mac(b);

                } catch (Exception e) {

                        e.printStackTrace();

                }

                return strMacAddress;

        }

    /**

    *獲取 wifi mac

    *@return

    */

    private String getWifiMac(){

        WifiManager wifi=(WifiManager)getSystemService(Context.WIFI_SERVICE);

        WifiInfo info=wifi.getConnectionInfo();

        return info.getMacAddress()==null?"":info.getMacAddress();

    }