android 以太网（ethernet）获取静态信息和动态信息.IP.子网掩码.getaway（以太网 一）

由于开发需要获取以太网的IP信息，设置静态IP等功能特此记录。

首先我们需要申请权限

 这个操作需要有自己编译的系统包，或者将对应 的SDK中的platforms\android-23\data\layoutlib.jar导入，同样上篇wifi中也可以这样，

 private void setEthernetInfo(){
        Boolean isethernetconnecyt = false;
        String ethernetIp = getEthernetIpAddress();//IP
        String ethernetMac = "";//MAC
        String ethernetDNS = "";//DNS
        String ethernetGateway = "";//网关
        String ethernetMask = "";//子网掩码
        Boolean isDHCP = true;//是否动态

        if( ethernetIp != null && !ethernetIp.isEmpty()){//判断是否有网络连接
            if (ethernetAdmin.getethernetstatic()){//判断是否是静态IP
                StaticIpConfiguration staticIpConfiguration  = ethernetAdmin.getConfiguration().staticIpConfiguration;
                isDHCP = false;
                  //获取静态IP设置的网络信息
                ethernetDNS = staticIpConfiguration.dnsServers.iterator().toString();
                ethernetGateway = staticIpConfiguration.gateway.getHostAddress();
                ethernetMask = utils.getMaskUtil(staticIpConfiguration.ipAddress.getNetworkPrefixLength());
                Iterator dns = staticIpConfiguration.dnsServers.iterator();
                if(dns.hasNext()){
                    ethernetDNS = dns.next().getHostAddress();
                }
            }else{
                isDHCP = true;
             //获取动态IP设置的网络信息
                ethernetMask = SystemProperties.get("dhcp.eth0.mask");
                ethernetGateway = SystemProperties.get("dhcp.eth0.gateway");
                ethernetDNS = SystemProperties.get("dhcp.eth0.dns1");
            }
        
        }else{
          //无网络连接
        }
        ethernetMac = getEthernetMAC();
        
    }

//获取以太网的IP地址  
public String getEthernetIpAddress() {
         mConnectivityManager = (ConnectivityManager) context.getSystemService(
                Context.CONNECTIVITY_SERVICE);
        LinkProperties linkProperties =
                mConnectivityManager.getLinkProperties(ConnectivityManager.TYPE_ETHERNET);
        for (LinkAddress linkAddress: linkProperties.getAllLinkAddresses()) {
            InetAddress address = linkAddress.getAddress();

            if (address instanceof Inet4Address) {

                return address.getHostAddress();
            }
        }
        // IPv6 address will not be shown like WifiInfo internally does.
        return "";
    }
//获取以太网的mac地址
 public String getEthernetMAC(){
           mEthernetManager = (EthernetManager)                 context.getSystemService(Context.ETHERNET_SERVICE);
        return mEthernetManager.getMacAddress();
    }

//上图中子网掩码换算
 public String getMaskUtil(int lenth){
        lenth = (-1 >> (31-(lenth-1))) << (31-(lenth-1));
        StringBuilder maskStr = new StringBuilder();
        byte[] maskIp = new byte[4];
        for (int i=0; i>(maskIp.length-1-i)*8);
            maskStr.append((maskIp[i] & 0xff));
            if (i < maskIp.length-1) {maskStr.append(".");}
        }
        return maskStr.toString();
    }