Android : Pulling page content to string android

I'm trying to pull a php page to string on android. The problem is that I can't get the response_str variable outside of the try. Whatever I'm doing it keep returning null. The URL return 1 or 0.

this is my code:

public String IsLoggedIn() {
        String url_text = "http://klh-dev.com/lehava/lehava/system/isloggedin.php";
        String response_str = null;
        try {
                HttpClient client = new DefaultHttpClient();
                HttpGet request = new HttpGet(url_text.toString());
                ResponseHandler<String> responseHandler = new BasicResponseHandler();
                response_str = client.execute(request, responseHandler);
        }
        catch (Exception e) {
        }
        return response_str;
}

Thank you, Morha13