Return ALL available IP addresses for an Android device?

Question

I have the need to list all available IP addresses for any particular Android Device.

I have found some sample code but this only results in returning one IP address, which happens to be an IPv6 address. I need to get all available IPs for any particular device. I do the same on an iOS version of this app and it returns 3 IPv6 addresses, one 192. address and one 10. address. I am trying to replicate the same on Android. I pass all values to an Array and display them in a list.

The code I have in place is:

public String getLocalIpAddress()
{
    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()) {
                    IPAddresses.setText(inetAddress.getHostAddress().toString());
                    return inetAddress.getHostAddress().toString();
                }
            }
         }
    } catch (SocketException ex) {
        String LOG_TAG = null;
        Log.e(LOG_TAG, ex.toString());
    }

    return null;
}

score 5 · Accepted Answer · answered Jun 03 '13 at 20:31

It looks to me like your code is just returning the first match - is that not the problem? I would have expected you to build up list of addresses, and return that instead of just a single string. Something like this:

public String[] getLocalIpAddress()
{          
    ArrayList<String> addresses = new ArrayList<String>();
    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()) {
                    IPAddresses.setText(inetAddress.getHostAddress().toString());
                    addresses.add(inetAddress.getHostAddress().toString());
                }
             }
         }
     } catch (SocketException ex) {
         String LOG_TAG = null;
         Log.e(LOG_TAG, ex.toString());
     }
     return addresses.toArray(new String[0]);
}

I'm not sure what the IPAddresses.setText call is doing, so I've left it in, but I expect that would also need to be adjusted in some way to handle the fact that you could have multiple addresses being matched.

I'm attempting your solution and trying to pass the returned value to an Array with no luck. I'm trying: String[] ipArray = new String[] { getLocalIpAddress() }; I've been on iOS for a while and I'm bit rusty coming back to Android! — Dan, Jun 03 '13 at 20:49
`String[] ipArray = getLocalIpAddress();` should be all you need to do. — James Holderness, Jun 03 '13 at 20:52

Return ALL available IP addresses for an Android device?

1 Answers1