couldn't receive the Json response result on HTTP GET Request

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Android

I'm new to Android platform. I couldn't get the response result from the HTTP GET request. Need a guidance on where i went wrong.

public class Window extends Service {
public void onCreate() {
        // TODO Auto-generated method stub
        super.onCreate();

HttpRequest request = new HttpRequest();
        String json = request.execute("url").toString();

        txtPackageName.setText(json); //txtPackageName - is a TextView
}

My HttpRequest File

public class HttpRequest extends AsyncTask<String,Void, JSONArray> {

    @Override
    protected JSONArray doInBackground(String... params) {
        URL url;
        HttpURLConnection urlConnection = null;
        JSONArray response = new JSONArray();

        try {
            url = new URL(params[0]);
            urlConnection = (HttpURLConnection) url.openConnection();
            int responseCode = urlConnection.getResponseCode();

            String responseString = readStream(urlConnection.getInputStream());
            Log.v("CatalogClient", responseString);
            response = new JSONArray(responseString);
            /*
            if(responseCode == HttpStatus.SC_OK){
                String responseString = readStream(urlConnection.getInputStream());
                Log.v("CatalogClient", responseString);
                response = new JSONArray(responseString);
            }else{
                Log.v("CatalogClient", "Response code:"+ responseCode);
            }*/

        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            if(urlConnection != null)
                urlConnection.disconnect();
        }

        return response;
    }

    private String readStream(InputStream in) {
        BufferedReader reader = null;
        StringBuffer response = new StringBuffer();
        try {
            reader = new BufferedReader(new InputStreamReader(in));
            String line = "";
            while ((line = reader.readLine()) != null) {
                response.append(line);
            }
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (reader != null) {
                try {
                    reader.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
        return response.toString();
    }


}