XML

Android Club 2015

Agenda

• XML• JSON

XML

• eXtensible Markup Language• Used for: data transfer• PHP -> Java

XML: example

XML: example

<?xml version="1.0" encoding="UTF-8" ?><countries> <country> <name>Uzbekistan</name> <capital>Tashkent</capital> <currency>Sum</ currency> </country></countries>

XML: practice

• Add following countries:• Russia – Moscow – Ruble• China – Beijing – Yuan• Japan – Tokyo – Yen• US – Washington – US Dollar• Germany – Berlin - Euro

XML Parsing (разобрать)

• DOM• JDOM• StAX• JAXB• Lynda.com - XML Integration with Java

Android XML parsers

• DOM• SAX• XmlPullParser

DOM: example

• DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();

• DocumentBuilder builder = factory.newDocumentBuilder();

• Document doc = builder.parse("http://www.w3schools.com/xml/simple.xml");

DOM: example

• NodeList list = doc.getElementsByTagName("food");

• for (int i = 0; i < list.getLength(); i++) {Element element = (Element) list.item(i);String value =

element.getElementsByTagName("name").item(0).getTextContent();

System.out.println(value);• }

DOM: practice

• http://joerichard.net/api/ac/countries.xml

• Create DocumentBuilderFactory• Create DocumentBuilder • Create Document -> use before

stated URL• Get node list• Print country names

DOM: practice (cont)

• http://joerichard.net/api/ac/countries.xml

• Print: [CAPITAL] is capital city of [COUNTRY]

• Example: Tashkent is capital city of Uzbekistan

DOM: practice 2

• http://joerichard.net/api/ac/books.xml• Create DocumentBuilderFactory• Create DocumentBuilder• Create Document -> use before

stated URL• Get node list• Print book titles

POJO

• Plain old java object

XML - example

<food><name>Belgian Waffles</name>

<price>$5.95</price><description>Two of our famous

Belgian Waffles with plenty of real maple syrup

</description><calories>650</calories>

</food>

POJO - example

• String name;• String price;• String description;• int calories;

• Getters + setters

XML parsing: example

• List<Food> foodList = new ArrayList<>();

• Food food = new Food();• food.setName(name);• food.setDescription(description);• food.setPrice(price);• food.setCalories(Integer.parseInt(calories));

• foodList.add(food);

POJO - practice

• http://joerichard.net/api/ac/countries.xml

• Create list of country POJOs• Print amount of countries using POJO

list

POJO – practice 2

• http://joerichard.net/api/ac/books.xml• Create list of books POJOs• Print amount of books

FINAL PRACTICE

• http://joerichard.net/api/ac/students.xml

• Create DocumentBuilderFactory• Create DocumentBuilder• Create Document• Create node list• Using node list parse XML to POJOs

list• Print names: firstname+lastname

Questions?

• Do you have questions?

Review

• Chapter 10: File management

Next lesson

• Tic Tac Toe

Test: June 29th

• Warmup-1 & Warmup-2 10%+10%• String-1 & String-2 10%+10%• Array-1 & Array-2 10%+10%• Logic-1 & Logic-2 10%+10%• Project Euler 1 problem from 1-20

20%• 8*10%+1*20%=100%• Next month will be FREE!

Thank you

• Thank you for your attention!