如何在Android中扫描IP

Question

我想创建一个“简单”的应用程序来查找给定网络中的所有 IP 地址..

例如……

我有一个按钮，点击后，可以找到所有 IP 地址并在 ListView 中显示它们。

有人有示例或功能源代码可以解释如何做吗？

对不起我的英语 =)

Answer 1

这是我在本地网络中查找 IP 地址的代码。 首先，您必须找到您的设备 IP 地址，然后使用该 IP 地址的subnet ping 每个 IP 地址。假设设备 IP 地址为192.168.0.100，则本地subnet 为192.168.0.。然后从192.168.0.1 ping 每个IP 地址到192.168.0.255 以查找设备的IP 地址，您可以使用两种方法： 1 方法：

    String ip = "";
      Enumeration<NetworkInterface> enumNetworkInterfaces =  NetworkInterface.getNetworkInterfaces();

           while(enumNetworkInterfaces.hasMoreElements())
           {
            NetworkInterface networkInterface = enumNetworkInterfaces.nextElement();
     Enumeration<InetAddress> enumInetAddress = networkInterface.getInetAddresses();

      while(enumInetAddress.hasMoreElements())
            {
             InetAddress inetAddress = enumInetAddress.nextElement();
    String ipAddress = "";
    if(inetAddress.isSiteLocalAddress())
             {
              ipAddress = "SiteLocalAddress: ";
    }
     ip += ipAddress + inetAddress.getHostAddress() + "\n";
String subnet = getSubnetAddress(ip);

private String getSubnetAddress(int address) 
     {
         String ipString = String.format(
                   "%d.%d.%d",
                   (address & 0xff),
                   (address >> 8 & 0xff),
                   (address >> 16 & 0xff));

                   return ipString;
     }

2 方法：

 WifiManager mWifiManager = (WifiManager) getSystemService(Context.WIFI_SERVICE);
    WifiInfo  mWifiInfo = mWifiManager.getConnectionInfo();
String subnet = getSubnetAddress(mWifiManager.getDhcpInfo().gateway);

找到子网地址后，ping网络中的每个IP地址：

 private void checkHosts(String subnet)
     {
         try 
         {
             int timeout=5;
             for (int i=1;i<255;i++)
             {
                 String host=subnet + "." + i;
                 if (InetAddress.getByName(host).isReachable(timeout))
                 {
                     Log.d(TAG, "checkHosts() :: "+host + " is reachable");
                 }
             }
         }
         catch (UnknownHostException e) 
         {
             Log.d(TAG, "checkHosts() :: UnknownHostException e : "+e);
             e.printStackTrace();
         } 
         catch (IOException e) 
         {
             Log.d(TAG, "checkHosts() :: IOException e : "+e);
             e.printStackTrace();
         }
    }

在 ping 每个 IP 地址之后，android 内核文件会存储那些在网络中的 IP 地址。您可以通过调用 AndroidOS 文件获取此列表。这个文件是arp，它存储在android中的/proc/net/中。您可以通过代码进入。只需以编程方式执行特定命令并将其存储在您的模型数据中，然后通过适配器通知您的 listView：

ArrayList<IpAddress> mIpAddressesList;
    private boolean getIpFromArpCache() 
         {
             BufferedReader br = null;
             char buffer[] = new char[65000];
             String currentLine;
             try 
             {
                 br = new BufferedReader(new FileReader("/proc/net/arp"));

                 while ((currentLine = br.readLine()) !=  null) 
                 {
                     Log.d(TAG, "getIpFromArpCache() :: "+ currentLine);

                     String[] splitted = currentLine.split(" +");
                     if (splitted != null && splitted.length >= 4) 
                     {
                        String ip = splitted[0];
                        String mac = splitted[3];
                        if (!splitted[3].equals(emptyMac)) 
                        {
                            if (!splitted[0].equals(IP)) 
                            {
    //                          int remove = mac.lastIndexOf(':');
    //                          mac = mac.substring(0,remove) + mac.substring(remove+1);
                                mac = mac.replace(":", "");
                                Log.i(TAG, "getIpFromArpCache() :: ip : "+ip+" mac : "+mac);
                                mIpAddressesList.add(new IpAddress(ip, mac));
                            }
                        }
                     }

                 }

                 return true;

             } 
             catch (Exception e) 
             {
                 e.printStackTrace();
             } 
             finally 
             {
                 try 
                 {
                     br.close();
                 } 
                 catch (IOException e) 
                 {
                     e.printStackTrace();
                 }
             }
             return false;
         }



public class IpAddress 
{
    private String ipAddressName;
    private String macAddress;


    public IpAddress(String ipAddressName, String macAddress) 
    {
        setIpAddressName(ipAddressName);
        setMacAddress(macAddress);
    }

    public void setIpAddressName(String ipAddressName) 
    {
        this.ipAddressName = ipAddressName;
    }

    public String getIpAddressName() 
    {
        return this.ipAddressName;
    }


    public void setMacAddress(String macAddress) 
    {
        this.macAddress = macAddress;
    }


    public String getMacAddress() 
    {
        return this.macAddress;
    }
}

但是在主线程上执行这些网络操作并不好。您必须将所有代码推送到线程上。并在后台线程上执行所有与网络相关的问题。希望它可以帮助你。让我知道天气是否有效。 如果你需要我想分享这个演示的.apk。

Answer 2

你可以试试这样的：

public class MainActivity extends Activity  {

       WifiManager wifi;
       String wifis[];
       WifiScanReceiver wifiReciever;

       @Override
       protected void onCreate(Bundle savedInstanceState) {
          super.onCreate(savedInstanceState);
          setContentView(R.layout.activity_main);

          wifi=(WifiManager)getSystemService(Context.WIFI_SERVICE);
          wifiReciever = new WifiScanReceiver();
          wifi.startScan();
       }



       protected void onResume() {
          registerReceiver(wifiReciever, new IntentFilter(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION));
          super.onResume();
       }



       private class WifiScanReceiver extends BroadcastReceiver{
          public void onReceive(Context c, Intent intent) {
             List<ScanResult> wifiScanList = wifi.getScanResults();
             wifis = new String[wifiScanList.size()];

             for(int i = 0; i < wifiScanList.size(); i++){
                wifis[i] = ((wifiScanList.get(i)).toString());
             }
             //here you can set your list view with wifis
          }
       }
    }