java - 如何在android中获取IP地址的主机名？

Question

我想制作一个小型 Android 应用程序，从连接的 LAN 网络获取 IP 地址和主机名。我有一个运行良好的代码，可以在连接的 LAN 网络中获取 ip 地址，但我不知道如何获取其 ip 地址的主机名。我需要更改代码的地方。抱歉英语不好。

Here is my code for getting ip address in lan network

String connections = "";
    InetAddress host;
    try
    {
        host = InetAddress.getByName("192.168.1.1");
       byte[] ip = host.getAddress();
       for(int i = 1; i <= 254; i++)
        {
            ip[3] = (byte) i;
            InetAddress address = InetAddress.getByAddress(ip);

            if(address.isReachable(100))
            {


                System.out.println(address + " machine is turned on and can be pinged "+address.getCanonicalHostName());
                connections+= address+"\n";
            }
            else if(!address.getHostAddress().equals(address.getHostName()))
            {
                System.out.println(address + " machine is known in a DNS lookup");
                System.out.println(address.getHostAddress()+"host Name:"+ address.getHostName());
            }

        }
        tv.setText(connections);

    }
    catch(UnknownHostException e1)
    {
        e1.printStackTrace();
    }
    catch(IOException e)
    {
        e.printStackTrace();
    }

Answer 1

使用.getHostname()

InetAddress addr = InetAddress.getByName("192.168.1.1");
String host = addr.getHostName();
System.out.println(host);