如何在android中准确扫描所有连接到wifi的设备的IP和Mac地址？

概述嗨,我想找到从Android连接到我的WIFI路由器的所有设备,我需要设备Mac地址和每个设备的本地IP地址(包括iOT设备),现在,我试图从ARP缓存表中找到.但是在扫描的某个时候某些设备丢失了,它并不那么准确.我的代码：List<LocalDeviceInfo>devicesInfos=newArrayList<>();

嗨,我想找到从Android连接到我的WIFI路由器的所有设备,我需要设备Mac地址和每个设备的本地IP地址(包括iOT设备),
现在,我试图从ARP缓存表中找到.但是在扫描的某个时候某些设备丢失了,它并不那么准确.

我的代码：

 List<LocalDeviceInfo> devicesInfos = new ArrayList<>();        BufferedReader bufferedReader = null;        try {            bufferedReader = new BufferedReader(new fileReader("/proc/net/arp"));            String line;            while ((line = bufferedReader.readline()) != null) {                String[] splitted = line.split(" +");                if (splitted != null && splitted.length >= 4) {                    String ip = splitted[0];                    String mac = splitted[3];                    if (mac.matches("..:..:..:..:..:..")) {                        LocalDeviceInfo thisNode = new LocalDeviceInfo(ip, mac);                        devicesInfos.add(thisNode);                    }                }            }        } catch (fileNotFoundException e) {            e.printstacktrace();        } catch (IOException e) {            e.printstacktrace();        } finally{            try {                bufferedReader.close();            } catch (IOException e) {                e.printstacktrace();            }        }        // Print Description        for (LocalDeviceInfo devicesInfo :devicesInfos)        {            System.out.print("✅");            System.out.println("IP : "+devicesInfo.getIp());            System.out.println("Mac : "+devicesInfo.getMacAddress());        }

How can i scan all devices (IP address and Mac address) in
androID accurately .

解决方法:

我找到了我的问题的解决方案,大多数设备都不在系统arp表中,所以你需要在第一次Ping每个设备,一旦你Ping该设备它将存储在系统ARP表中存储在(/ PROC /净/ ARP)

使用ip Ping所有设备:(首先需要找到设备的IP地址,而不是确定子网掩码,你可以从(0-255)开始学习

码：

public  voID startPingService(Context context){  List<LocalDeviceInfo> deviceInfoList  = new ArrayList<LocalDeviceInfo>();    try {        WifiManager mWifiManager = (WifiManager) context.getSystemService(Context.WIFI_SERVICE);        WifiInfo mWifiInfo = mWifiManager.getConnectionInfo();        String subnet = getsubnetAddress(mWifiManager.getDhcpInfo().gateway);        for (int i=1;i<255;i++){            String host = subnet + "." + i;            if (InetAddress.getByname(host).isReachable(timeout)){                String strMacAddress = getMacAddressFromIP(host);                Log.w("Devicediscovery", "Reachable Host: " + String.valueOf(host) +" and Mac : "+strMacAddress+" is reachable!");                    LocalDeviceInfo localDeviceInfo = new LocalDeviceInfo(host,strMacAddress);                    deviceInfoList.add(localDeviceInfo);             }            else            {                Log.e("Devicediscovery", "❌ Not Reachable Host: " + String.valueOf(host));            }        }    }    catch(Exception e){        //System.out.println(e);    }}private String getsubnetAddress(int address){    String ipString = String.format(            "%d.%d.%d",            (address & 0xff),            (address >> 8 & 0xff),            (address >> 16 & 0xff));    return ipString;}

从ARP缓存表中获取Mac地址

public String getMacAddressFromIP(@NonNull String ipFinding){    Log.i("IPScanning","Scan was started!");    List<LocalDeviceInfo> antarDevicesInfos = new ArrayList<>();    BufferedReader bufferedReader = null;    try {        bufferedReader = new BufferedReader(new fileReader("/proc/net/arp"));        String line;        while ((line = bufferedReader.readline()) != null) {            String[] splitted = line.split(" +");            if (splitted != null && splitted.length >= 4) {                String ip = splitted[0];                String mac = splitted[3];                if (mac.matches("..:..:..:..:..:..")) {                    if (ip.equalsIgnoreCase(ipFinding))                    {                        return mac;                    }                }            }        }    } catch (fileNotFoundException e) {        e.printstacktrace();    } catch (IOException e) {        e.printstacktrace();    } finally{        try {            bufferedReader.close();        } catch (IOException e) {            e.printstacktrace();        }    }    return "00:00:00:00";}

您也需要这些权限：

<uses-permission androID:name="androID.permission.INTERNET" /><uses-permission androID:name="androID.permission.ACCESS_WIFI_STATE" /><uses-permission androID:name="androID.permission.ACCESS_NETWORK_STATE" />

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