DNS IP Address Lookup from Host name in Java

dnsLookup.java

// Needs to be run on async otherwise you will get a crash.
// Make sure you have the internet permission added to the app manifest if this is going in an Anrdoid app...

    <uses-permission android:name="android.permission.INTERNET" />

public class DnsLookup extends AsyncTask<ArrayList<String>, Integer, ArrayList<HostIpDetails>> {

    private static String TAG = "DnsLookup";

    public interface DnsLookUpCompletionListener {
        void completed(ArrayList<HostIpDetails> hostDetails);
    }

    private String mFoundIp;

    private DnsLookUpCompletionListener mListener;

    public void excuteWithListener(ArrayList<String> strings, DnsLookUpCompletionListener listener) {
        mListener = listener;
        execute(strings);
    }

    @Override
    protected ArrayList<HostIpDetails> doInBackground(ArrayList<String>... strings) {
        ArrayList<HostIpDetails> details = new ArrayList<>();

        if (strings.length == 0) {
            return details;
        }

        ArrayList<String> hostNames = strings[0];

        for (String hostName : hostNames) {
            try {
                InetAddress inet = InetAddress.getByName(hostName.toLowerCase());
                String hostIp = inet.getHostAddress();

                if (hostIp != null) {
                    details.add(new HostIpDetails(hostName, hostIp));
                }
            } catch (UnknownHostException e) {
                e.printStackTrace();
                Log.i(TAG, "Host " + hostName + " not found");
            }
        }

        return details;
    }

    @Override
    protected void onPostExecute(ArrayList<HostIpDetails> hostIpDetails) {
        if (mListener != null) {
            mListener.completed(hostIpDetails);
        }
    }
}

//==================================
// Host Info Model Class

public class HostIpDetails {

    private String mHostName;
    private String mHostIp;

    public HostIpDetails(String hostName, String hostIp) {
        mHostName = hostName;
        mHostIp = hostIp;
    }

    public String getHostName() {
        return mHostName;
    }

    public String getHostIp() {
        return mHostIp;
    }
}

//==================================
// TO RUN IT...

ArrayList<String> ips = new ArrayList<>();
        ips.add(hostName);

        DnsLookup lookup = new DnsLookup();
        lookup.excuteWithListener(ips, new DnsLookup.DnsLookUpCompletionListener() {
            @Override
            public void completed(ArrayList<HostIpDetails> hostDetails) {
              // Returns an Array of found host details.
            }
        });

        return null;
    }