1. JSON
Android Club 2015

2. Agenda
JSON
Parsing
ListView

3. What is JSON? JavaScript Object Notation Minimal Readable format
Server <-> Client
Alternative to XML
Language independant

4. JSON object: example
{ "id": 9999, "firstName": "Joe", "lastName": "Richard“ }

5. JSON object: practice
Create object for one book: author: Haruki Murakami title: Norwegian Wood year: 1987 You can check JSON in

6. JSON array: example
{ "employees": [ "firstName": "Joe", "lastName": "Richard" }, "firstName": "Anna", "lastName": "Kim" "firstName": "Kain", "lastName": "Saridzawa" } ]

7. JSON array: practice Create array: students Add three students:
Each student should contain
1) id
2) first_name
3) last_name

8. JSON symbols { object } [ array ] : equals “variable/object name”
“String”
int

9. JSON parsing: example http://joerichard.net/api/ac/student.json
JSONObject object = new JSONObject(s); String id = object.getString("id"); MainActivity.tvData.setText("My id is "+id);

10. JSON parsing: practice
Parse JSON object
Take its ip
Message: “My ip is ”

11. JSON object parsing: example
Create Student POJO
It should include: id, first_name, last_name
Create JSON object to Student object

12. JSON object parsing: practice
Create POJO: JsonIP
It should have: ip, about, Pro!
Convert JSON Object to JsonIP object

13. JSON array: example
JSONObject object = new JSONObject(s); JSONArray employees = object.getJSONArray("employees"); StringBuilder sb = new StringBuilder(); for (int i = 0; i < employees.length(); i++) { JSONObject employee = employees.getJSONObject(i); String firstName = employee.getString("firstName"); String lastName = employee.getString("lastName"); sb.append(firstName+" "+lastName+"\n"); } MainActivity.tvData.setText(sb.toString());

14. JSON array: practice http://joerichard.net/api/ac/tariffs.json
Show list of tarrifs

15. JSON array ->Object list: example
Create POJO: Employee
It should include: firstName, lastName
Convert JSON array to Object list
Show amount of list items

16. JSON array -> POJO list: practice
Create POJO: Tariff
It should contain: id, name
Convert JSON array to Tariff list
Show size of list

17. Homework http://joerichard.net/api/tw/tw.json
Take data from Object->daily->data array
Show weather data in TextView in this form
c-34c
c-40c
… like this for 7 days

18. Questions?
Any questions?

19. Thank you
Thank you for your attention!