1. Networking Android Club 2015

2. Networking AsyncTask HttpUrlConnection JSON Parser

3. Thread UI thread Background thread

4. AsyncTask Helps us to manage process of backgroud thread Started from UI thread

5. AsyncTask: 3 parameters 1. Params 2. Progess 3. Result

6. AsyncTask: example TimeUnit.SECONDS.sleep(10);

7. AsyncTask: practice Create public static ProgressDialog in Activity Create AsyncTask onPreExecute: set message to dialog onPreExecute: show progress dialog onPostExecute: dismiss dialog

8. AsyncTask: pass data HttpTask task = new HttpTask(); task.execute(3); TimeUnit.SECONDS.sleep(params[0]);

9. Pass data: practice Change previous code so that it should wait twice amount of time If you pass 3, it should wait 6 seconds If 10, then 20

10. Networking: easiest way 1.Add permission: INTERNET 2.Create AsyncTask 3. Create HttpUrlConnection 4. Convert InputStream to String 5. Update UI 6. Start from UI

11. Step 1: Add permission Open AndroidManifest.xml Add this permission:

12. Step 2: Create AsynkTask public class HttpTask extends AsyncTask { @Override protected String doInBackground(String... params) { return null; } @Override protected void onPostExecute(String s) { } }

13. Step 3: HttpUrlConnection URL url = new URL(params[0]); HttpURLConnection connection = (HttpURLConnection) url.openConnection(); connection.connect();

14. Step 4: InputString to String InputStream stream = connection.getInputStream(); InputStreamReader isReader = new InputStreamReader(stream ); BufferedReader buffer = new BufferedReader(isReader ); StringBuilder content = new StringBuilder(); String line; while ((line = buffer.readLine()) != null) { content.append(line); }

15. Step 5: Update UI MainActivity.tvData.setText(s);

16. Step 6: Start from UI HttpTask task = new HttpTask(); String url = "http://jsonip.com"; task.execute(url);

17. HttpUrlConnection: practice http://www.telize.com/geoip?callback=YOUR_IP 1.Create new AsyncTask 2. Get content using HttpUrlConnection 3. Convert content InputStream to String 4. Update UI 5. Pass that URL to AsyncTask

18. Parsing JSON: example JSONObject object = new JSONObject(s); String ip = object.getString("ip"); MainActivity.tvData.setText("My ip address is "+ip);

19. Parsing JSON: practice http://www.telize.com/geoip?callback=Y OUR_IP Show latitude Show longitude Show ISP Show country

20. Homework 1: Forecast.IO developer.forecast.io

21. Homework 2: Football- api.com http://football-api.com Demo - EPL Free English Premier League Access limit: 1000 requests per hour Access from 1 IP address

22. Homework 3: Your own API Create your own API For example: calculator for communal services