Java Inetaddress.Getlocalhost(); Returns 127.0.0.1 ... How to Get Real Ip

InetAddress.getLocalHost().getHostAddress() is returning 127.0.1.1

You'll need to use NetworkInterface to enumerate network interfaces; InetAddress.getLocalHost() always returns loopback. This doesn't explain why you get 127.0.1.1 instead of 127.0.0.1, but since that method doesn't do what you're trying to do, it doesn't seem especially pertinent. See: http://docs.oracle.com/javase/6/docs/api/java/net/NetworkInterface.html#getInetAddresses()

why does InetAddress.getLocalHost().getHostAddress() returns 127.0.0.1 in android .But works fine in JAVA program

This is expected behavior on Android. Please refer to the javadoc for getLocalHost():

Note that if the host doesn't have a hostname set – as Android devices
typically don't – this method will effectively return the loopback
address, albeit by getting the name localhost and then doing a lookup
to translate that to 127.0.0.1.

InetAddress: getHostAddress() returns 127.x.x.x instead of external IP address

The result of that function depends on your system's configuration (which host is treated as "canonical" by your OS), which can be system and configuration dependent.

To find out internet addresses for your system, use NetworkInterface::getNetworkInterfaces(), as described eg. here: https://docs.oracle.com/javase/tutorial/networking/nifs/listing.html

In your case, what you want to do is probably something like this:

InetAddress theOneAddress = null;
Enumeration<NetworkInterface> nets = NetworkInterface.getNetworkInterfaces();
for (NetworkInterface netint : Collections.list(nets)) {
    if (!netint.isLoopback()) {
        theOneAddress = Collections.list(netint.getInetAddresses()).stream().findFirst().orElse(null);
        if (theOneAddress != null) {
            break;
        }
    }
}

Java. InetAddress.getLocalHost returns strange IP

The problem is that my hostname will consists only of numbers and could not be resolved.
I change my /etc/hostname with characters at first position and problem has solved.

Java InetAddress.getLocalHost().getHostAddress() returns invalid IP

Finally managed to fix it.

The issue, as @guest pointed out, is for some reason connecting to VPN messes up name resolution, so that my localhost is resolved to some remote IP.

The solution was to simply add an /etc/hosts entry, manually mapping my hostname to 127.0.0.1. That fixed it.

InetAddress.getLocalHost().getHostAddress() returns 127.0.0.1 in Android

Modified few bits and this one is working as desired for getting IPv4 addresses. !inetAddress.isLoopbackAddress() removes all the loopback address. !inetAddress.isLinkLocalAddress() and inetAddress.isSiteLocalAddress()) removes all IPv6 addresses. I hope this will help someone in here.

    StringBuilder IFCONFIG=new StringBuilder();
    try {
        for (Enumeration<NetworkInterface> en = NetworkInterface.getNetworkInterfaces(); en.hasMoreElements();) {
            NetworkInterface intf = en.nextElement();
            for (Enumeration<InetAddress> enumIpAddr = intf.getInetAddresses(); enumIpAddr.hasMoreElements();) {
                InetAddress inetAddress = enumIpAddr.nextElement();
                if (!inetAddress.isLoopbackAddress() && !inetAddress.isLinkLocalAddress() && inetAddress.isSiteLocalAddress()) {
                IFCONFIG.append(inetAddress.getHostAddress().toString()+"\n");
                }

            }
        }
    } catch (SocketException ex) {
        Log.e("LOG_TAG", ex.toString());
    }
    servers.add(IFCONFIG.toString());