Getting IP address in simple way.

IPFinderTask.java

import android.os.AsyncTask;
import android.util.Log;

import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;

public class IPFinderTask extends AsyncTask<Void, Void, String> {

    private static final String TAG = IPFinderTask.class.getSimpleName();

    public static IPFinderTask newInstance() {
        return new IPFinderTask();
    }

    @Override
    protected String doInBackground(Void... voids) {
        try {
            URL url = new URL("https://api.ipify.org/?format=text");
            HttpURLConnection httpConnection = (HttpURLConnection) url.openConnection();
            httpConnection.setRequestMethod("GET");
            InputStream inputStream = httpConnection.getInputStream();
            InputStreamReader inputStreamReader = new InputStreamReader(inputStream);
            BufferedReader bufferedReader = new BufferedReader(inputStreamReader);
            String ip = bufferedReader.readLine();
            Log.d(TAG, "IP : " + ip);
            httpConnection.disconnect();
            return ip;
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }
}