android4.0 通过DHCP方式实现以太网连接

前段时间做了个厂家测试程序，中间有涉及到网口的检测。基于android4.0的以太网DHCP或者设置静态Ip来实现网络连接，主要实现过程如下：

一。DHCP动态获取ip实现网络连接

1.注册网络状态变化的广播接收：

private void registerEthernet() {IntentFilter ethFilter = new IntentFilter(EthernetManager.ETHERNET_STATE_CHANGED_ACTION);ethFilter.addAction(EthernetManager.NETWORK_STATE_CHANGED_ACTION);registerReceiver(mEthConnectReceiver, ethFilter);}private BroadcastReceiver mEthConnectReceiver = new BroadcastReceiver() {@Overridepublic void onReceive(Context context, Intent intent) {String action = intent.getAction();Log.d(TAG, " Ethernet onRecevice action = " + action);if (action.equals(EthernetManager.ETHERNET_STATE_CHANGED_ACTION)) {int msg = intent.getIntExtra(EthernetManager.EXTRA_ETHERNET_STATE, -1);switch (msg) {case EthernetDataTracker.EVENT_DHCP_CONNECT_FAILED:break;case EthernetDataTracker.EVENT_DHCP_DISCONNECT_FAILED:break;case EthernetDataTracker.EVENT_STATIC_CONNECT_FAILED:break;case EthernetDataTracker.EVENT_STATIC_DISCONNECT_FAILED:break;case EthernetDataTracker.EVENT_DHCP_CONNECT_SUCCESSED:pingEthGateway(getEthGateWay());//ping命令DHCP连接网络是否成功break;case EthernetDataTracker.EVENT_DHCP_DISCONNECT_SUCCESSED:break;case EthernetDataTracker.EVENT_STATIC_CONNECT_SUCCESSED:pingEthGateway(getEthGateWay());//ping命令测试静态IP连接网络是否成功break;case EthernetDataTracker.EVENT_STATIC_DISCONNECT_SUCCESSED:break;case EthernetDataTracker.EVENT_PHY_LINK_UP:setDhcp();//网线插上后自己进行DHCPbreak;case EthernetDataTracker.EVENT_PHY_LINK_DOWN:Log.d(TAG, "EVENT_PHY_LINK_DOWN ");//网线拔出break;default:break;}}}};

2.通过DHCP实现网络连接

private String dhcp_gateway = null;private String wifi_gateway = null;private EthernetManager mEthManager = null;private WifiManager mWifiManager = null;private ConnectivityManager mConnectivityManager = null;public void getInstance(Context context) {mEthManager = (EthernetManager) context.getSystemService(Context.ETHERNET_SERVICE);mWifiManager = (WifiManager) context.getSystemService(Context.WIFI_SERVICE);mConnectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);}public void setDhcp() {mWifiManager.setWifiEnabled(false);//断开WIFI的连接mEthManager.setEthernetEnabled(false);Log.i(TAG, "getEthernetState=" + mEthManager.getEthernetState());mEthManager.setEthernetDefaultConf();mEthManager.setInterfaceName("eth0");mEthManager.setEthernetEnabled(true);Log.i(TAG, "getEthernetState=" + mEthManager.getEthernetState());}

3.获取IP信息：

public String getEthGateWay() {String ip = mConnectivityManager.getLinkProperties(ConnectivityManager.TYPE_ETHERNET).getAddresses().toString();String mGW = mConnectivityManager.getLinkProperties(ConnectivityManager.TYPE_ETHERNET).getRoutes().toString();String mDns = mConnectivityManager.getLinkProperties(ConnectivityManager.TYPE_ETHERNET).getDnses().toString();Log.i(TAG, "getEthGateWay ip=" + ip);Log.i(TAG, "getEthGateWay mGW=" + mGW);Log.i(TAG, "getEthGateWay mDns=" + mDns);if (mGW.contains(">")) {mGW = mGW.substring(mGW.lastIndexOf('>') + 2, mGW.length() - 1);}dhcp_gateway = mGW;return mGW;}

其中获取的Ip信息为：

getEthGateWay ip=[/192.168.1.102]
getEthGateWay mGW=[0.0.0.0/0 -> 192.168.1.1]
getEthGateWay mDns=[/192.168.10.247, /192.168.1.1]

因此需要对网关信息进行处理。

4.Ping命令测试IP地址:

使用Root权限，通过JNI封装成一个系统库，调用exe command进行ping -c 4 -w 100 192.168.1.1测试。代码将不详细贴出。

执行结果：

I/SystemTestingJNI( 1836): executeCommand ret=0, result=PING 192.168.1.1 (192.168.1.1) 56(84) bytes of data.
I/SystemTestingJNI( 1836): 64 bytes from 192.168.1.1: icmp_seq=1 ttl=64 time=6.54 ms
I/SystemTestingJNI( 1836): 64 bytes from 192.168.1.1: icmp_seq=2 ttl=64 time=0.316 ms
I/SystemTestingJNI( 1836): 64 bytes from 192.168.1.1: icmp_seq=3 ttl=64 time=0.194 ms
I/SystemTestingJNI( 1836): 64 bytes from 192.168.1.1: icmp_seq=4 ttl=64 time=0.255 ms
I/SystemTestingJNI( 1836):
I/SystemTestingJNI( 1836): --- 192.168.1.1 ping statistics ---
I/SystemTestingJNI( 1836): 4 packets transmitted, 4 received, 0% packet loss, time 3001ms
I/SystemTestingJNI( 1836): rtt min/avg/max/mdev = 0.194/1.826/6.542/2.723 ms

--还有一种方法，使用Runtime去ping,但是需要注意权限问题，以及输入输出流得自己处理。exec执行时阻塞、非阻塞，返回结果问题

Process p= Runtime.getRuntime().exec(cmd);//String cmd

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二。通过设置静态IP连接网络：

public static void setStaticIp() {mWifiManager.setWifiEnabled(false);mEthManager.setEthernetEnabled(false);DhcpInfoInternal mDhcpInfoInternal = new DhcpInfoInternal();InetAddress iRoute = NetworkUtils.numericToInetAddress("192.168.1.103");InetAddress iNetmask = NetworkUtils.numericToInetAddress("255.255.255.0");try {int netmask = NetworkUtils.inetAddressToInt(iNetmask);int prefixLength = NetworkUtils.netmaskIntToPrefixLength(netmask);mDhcpInfoInternal.prefixLength = prefixLength;} catch (IllegalArgumentException e) {e.printStackTrace();}mDhcpInfoInternal.ipAddress = "192.168.1.103";mDhcpInfoInternal.addRoute(new RouteInfo(iRoute));mDhcpInfoInternal.dns1 = "192.168.10.248";mDhcpInfoInternal.serverAddress = "255.255.255.0";mEthManager.saveEthernetIpInfo(mDhcpInfoInternal.makeDhcpInfo(),EthernetManager.ETHERNET_CONNECT_MODE_MANUAL);mEthManager.setEthernetEnabled(true);DhcpInfo dhcpInfo = mEthManager.getSavedEthernetIpInfo();dhcp_gateway = Formatter.formatIpAddress(dhcpInfo.gateway);}

----通过网口实现网络连接实现，就此Ending。。------

DHCP详细代码：http://www.oschina.net/code/snippet_1051613_26563

配置工程中需要引用framework.jar,services.jar。

配置方法：

取到out\target\common\obj\JAVA_LIBRARIES\framework_intermediates\class.jar，然后放到本地，右击工程进入java build path ,通过add Library--user library ---添加刚取到的class.jar,取名为framewrok.最后调整Java build path 中的order and Export 将framework一直up到第一个。

取到out\target\common\obj\JAVA_LIBRARIES\services_intermediates\class.jar。方法同framework.

环境配置好后，重新Build。就不会有红叉叉了！！

WIFI文章：WIFI，热点扫描，配对，以及IP的获取。

http://my.oschina.net/hiliusl/blog/175605

一。DHCP动态获取ip实现网络连接

1.注册网络状态变化的广播接收：

2.通过DHCP实现网络连接

3.获取IP信息：

二。通过设置静态IP连接网络：

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