android4.0 通过DHCP实现以太网连接

本文转载自 android4.0 通过DHCP实现以太网连接

由于项目需要，需要使用以太网进行通讯，看了一下一个网友的实现，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() {    @Override    public 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DHCP        break;        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。。——

后续会贴上 WIFI，热点扫描，配对，以及IP的获取。、

本文转载自 android4.0 通过DHCP实现以太网连接