An easy example of background network request in Android using AsyncTask.

AsyncTaskExample.java

package com.marcoscg.sportstv.utils;

import android.os.AsyncTask;

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.nio.charset.StandardCharsets;

public class AsyncTaskExample {

    public void loadData() {
        // Execute the async task
        new RestAsyncTask().execute("https://www.google.com/");
    }

    private class RestAsyncTask extends AsyncTask<String, Integer, String> {

        @Override
        protected void onPreExecute() {
            super.onPreExecute();

            // Here you can show a progressBar, a loading message...
        }

        @Override
        protected String doInBackground(String... urls) {
            StringBuilder stringBuilder = new StringBuilder();

            try {
                URL url = new URL(urls[0]);
                HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection();

                httpURLConnection.setReadTimeout(150000); //milliseconds
                httpURLConnection.setConnectTimeout(15000); // milliseconds
                httpURLConnection.setRequestMethod("GET");

                httpURLConnection.connect();

                if (httpURLConnection.getResponseCode() == HttpURLConnection.HTTP_OK) {
                    BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(
                            httpURLConnection.getInputStream(), StandardCharsets.UTF_8));
                    String line;

                    while ((line = bufferedReader.readLine()) != null) {
                        stringBuilder.append(line + "\n");
                    }
                } else {
                    return "Error: " + httpURLConnection.getResponseCode();
                }
            } catch (Exception e) {
                e.printStackTrace();
                return "Error: " + e.getLocalizedMessage();
            }

            return stringBuilder.toString();
        }

        @Override
        protected void onPostExecute(String s) {
            super.onPostExecute(s);

            // Do whatever you want with the result
        }
    }

}