Android获取热点提供设备的IP地址

Question

我正在使用

public static String getLocalIPAddress(WifiManager wm){
    return Formatter.formatIpAddress(wm.getConnectionInfo().getIpAddress());
}

获取执行设备的IP地址。如果设备连接到“公共”wlan网络，并且设备连接到由其他Android设备通过热点托管的wifi网络，则工作正常。如果设备未连接到任何wifi网络，则返回“0.0.0.0”（正确）。但是，如果设备通过提供热点来托管wifi网络，则该方法仍然返回“0.0.0.0”。如何在“自己的wifi网络”中获取热点提供设备的真实IP地址？

感谢和问候

Answer 1

你几乎是对的，热点的默认IP地址是192.168.43.1（如果设备制造商没有改变。）

您可以查看Android框架（AOSP）的源代码。

/frameworks/base/services/java/com/android/server/connectivity/Tethering.java /frameworks/base/wifi/java/android/net/wifi/WifiStateMachine.java

在Tethering.java中，

private static final String USB_NEAR_IFACE_ADDR      = "192.168.42.129";
private static final int USB_PREFIX_LENGTH        = 24;

// USB is  192.168.42.1 and 255.255.255.0
// Wifi is 192.168.43.1 and 255.255.255.0
// BT is limited to max default of 5 connections. 192.168.44.1 to 192.168.48.1
// with 255.255.255.0

private String[] mDhcpRange;
private static final String[] DHCP_DEFAULT_RANGE = {
    "192.168.42.2", "192.168.42.254", "192.168.43.2", "192.168.43.254",
    "192.168.44.2", "192.168.44.254", "192.168.45.2", "192.168.45.254",
    "192.168.46.2", "192.168.46.254", "192.168.47.2", "192.168.47.254",
    "192.168.48.2", "192.168.48.254",
};

另外，在WifiStateMachine.java中

private boolean startTethering(ArrayList<String> available) {                                 

    boolean wifiAvailable = false;                                                            

    checkAndSetConnectivityInstance();                                                        

    String[] wifiRegexs = mCm.getTetherableWifiRegexs();                                      

    for (String intf : available) {                                                           
        for (String regex : wifiRegexs) {                                                     
            if (intf.matches(regex)) {                                                        

                InterfaceConfiguration ifcg = null;                                           
                try {                                                                         
                    ifcg = mNwService.getInterfaceConfig(intf);                               
                    if (ifcg != null) {                                                       
                        /* IP/netmask: 192.168.43.1/255.255.255.0 */                          
                        ifcg.setLinkAddress(new LinkAddress(                                  
                                NetworkUtils.numericToInetAddress("192.168.43.1"), 24));      
                        ifcg.setInterfaceUp();                                                

                        mNwService.setInterfaceConfig(intf, ifcg);                            
                    }                                                                         
                } catch (Exception e) {                                                       
                    loge("Error configuring interface " + intf + ", :" + e);                  
                    return false;                                                             
                }                                                                             

                if(mCm.tether(intf) != ConnectivityManager.TETHER_ERROR_NO_ERROR) {           
                    loge("Error tethering on " + intf);                                       
                    return false;                                                             
                }                                                                             
                mTetherInterfaceName = intf;                                                  
                return true;                                                                  
            }                                                                                 
        }                                                                                     
    }                                                                                         
    // We found no interfaces to tether                                                       
    return false;                                                                             
}   

因此，默认值为192.168.43.1。

Answer 2

我测试了一小部分不同的设备，似乎热点提供设备总是在其网络上使用IP 192.168.43.1。有人可以检查/确认这个假设吗？

Answer 3

Hotspot可能充当DHCP服务器。所以，

从远程（客户端）连接到它后获取wifi热点的IP地址（服务器）

intToInetAddress(wifiManager.getDhcpInfo().serverAddress);// get hotspot ip

然后

public InetAddress intToInetAddress(int hostAddress) {
    byte[] addressBytes = {(byte) (0xff & hostAddress),
            (byte) (0xff & (hostAddress >> 8)),
            (byte) (0xff & (hostAddress >> 16)),
            (byte) (0xff & (hostAddress >> 24))};

    try {
        return InetAddress.getByAddress(addressBytes);
    } catch (UnknownHostException e) {
        throw new AssertionError();
    }
}

将返回已连接热点的IP地址，是的，热点的大多数默认IP地址是192.168.43.1

Answer 4

虽然这是一个老问题，但这可能对某人有所帮助。只要您打开热点，这将返回设备的IP地址。

private String getIpAddress() {
    String ip = "";
    try {
        Enumeration<NetworkInterface> enumNetworkInterfaces = NetworkInterface
                .getNetworkInterfaces();
        while (enumNetworkInterfaces.hasMoreElements()) {
            NetworkInterface networkInterface = enumNetworkInterfaces
                    .nextElement();
            Enumeration<InetAddress> enumInetAddress = networkInterface
                    .getInetAddresses();
            while (enumInetAddress.hasMoreElements()) {
                InetAddress inetAddress = enumInetAddress.nextElement();

                if (inetAddress.isSiteLocalAddress()) {
                    ip += "SiteLocalAddress: "
                            + inetAddress.getHostAddress() + "\n";
                }
            }
        }

    } catch (SocketException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
        ip += "Something Wrong! " + e.toString() + "\n";
    }
    return ip;
}