Android/Java code for managing download/service access tasks asynchronously via a generic query task and generic fetchdata method..

Android Async data fetch

  private class QueryTask extends AsyncTask<String, Void, String> {
		String role = new String();

		@Override
		protected String doInBackground(String... querySections) {
			/* querySections: requestURL, requestQuery, role (index/data) */
			String data = "", requestQuery = new String();
			role = querySections[2];
			try {
				requestQuery = URLEncoder.encode(querySections[1], "UTF-8");
			} catch (UnsupportedEncodingException e) {
				e.printStackTrace();
			}
			try {
				data = fetchData(querySections[0] + requestQuery);
			} catch (IOException e) {
				e.printStackTrace();
			}
			return (data);
		}

		/* check role and act accordingly */
		@Override
		protected void onPostExecute(String result) {
			super.onPostExecute(result);
			if (role.equals(new String("index"))) {
				// do whatever
			} else if (role.equals(new String("data"))) {
				// do whatever
			}
		}
	}

	private String fetchData(String reqString) throws IOException {
		int connectionTimeout = 4000;
		int responseTimeout = 5000;
		HttpParams httpParameters = new BasicHttpParams();
		HttpConnectionParams.setConnectionTimeout(httpParameters, connectionTimeout);
		HttpConnectionParams.setSoTimeout(httpParameters, responseTimeout);
		DefaultHttpClient client = new DefaultHttpClient(httpParameters);
		HttpGet httpget = new HttpGet(reqString);

		try {
			HttpResponse response = client.execute(httpget);
			HttpEntity httpEntity = response.getEntity();
			inputStream = httpEntity.getContent();
		} catch (Exception e) {
			e.printStackTrace();
		}

		StringBuilder stringBuilder = new StringBuilder();
		try {
			BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream, "iso-8859-1"), 8);
			String retrievedLine = null;
			while ((retrievedLine = reader.readLine()) != null) {
				stringBuilder.append(retrievedLine + "\n");
			}
			inputStream.close();
		} catch (Exception e) {
			e.printStackTrace();
		}
		return (stringBuilder.toString());
	}