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Checking whether Internet can be accessed without the user having to log in or agree to terms first via the browser
public class InternetCheck {

        public static boolean ActiveInternetExists() {

            boolean internetAccessExists = false;

            //make the android homepage as the requested url
            //this is a critical decision point.
            //the belief here is that this url can be accessed all around the world
            String urlToBeAccessed = "http://www.android.com/";

            final int TIMEOUT_VALUE_IN_MILLISECONDS = 6000;

            URL url;
            HttpURLConnection urlConnection = null;

            try {

                url = new URL(urlToBeAccessed);
                urlConnection = (HttpURLConnection) url.openConnection();

                //set the respective timeouts for the connection
                urlConnection.setConnectTimeout(TIMEOUT_VALUE_IN_MILLISECONDS);
                urlConnection.setReadTimeout(TIMEOUT_VALUE_IN_MILLISECONDS);

                //the redirect check is valid only after the response headers have been received
                //this is triggered by the getInputStream() method
                InputStream in = new BufferedInputStream(urlConnection.getInputStream());

                //check if the urls of the requested and landing pages are equal
                //if yes, then we don't have a redirect
                if (url.getHost().equals(urlConnection.getURL().getHost()))
                    internetAccessExists =  true;
            }

            //any sort of exception is considered as a redirect.
            //more specific exceptions such as SocketTimeOutException and IOException can be handled as well
            catch (Exception e) {
            }
            finally {
                urlConnection.disconnect();
            }

            return internetAccessExists;
        }

}