I have ArrayList with books in my android app, and I add 100 items in MainActivity as below:

a = new Book("J. K. Roaling", "Harry Potter", R.drawable.book_cover1);
bookList.add(a);

But I do not like the fact that because of this in MainActivity.java, there are a lot of lines. I would like to move all the lines to an XML file. But I do not know how to implement the xml file itself and read data from it.

4

1 Answer

you need to do XMLPullParsing here below code, please check

XML File

<?xml version="1.0" encoding="UTF-8"?>
<employees> <employee> <id>1</id> <name>Sachin</name> <salary>50000</salary> </employee> <employee> <id>2</id> <name>Nikhil</name> <salary>60000</salary> </employee>
</employees>

Mode class

public class Employee { private int id; private String name; private float salary; public int getId() { return id; } public void setId(int id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } public float getSalary() { return salary; } public void setSalary(float salary) { this.salary = salary; }
} 

XMLPullParserHandler

import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;
import org.xmlpull.v1.XmlPullParser;
import org.xmlpull.v1.XmlPullParserException;
import org.xmlpull.v1.XmlPullParserFactory;
public class XmlPullParserHandler { private List<Employee> employees= new ArrayList<Employee>(); private Employee employee; private String text; public List<Employee> getEmployees() { return employees; } public List<Employee> parse(InputStream is) { try { XmlPullParserFactory factory = XmlPullParserFactory.newInstance(); factory.setNamespaceAware(true); XmlPullParser parser = factory.newPullParser(); parser.setInput(is, null); int eventType = parser.getEventType(); while (eventType != XmlPullParser.END_DOCUMENT) { String tagname = parser.getName(); switch (eventType) { case XmlPullParser.START_TAG: if (tagname.equalsIgnoreCase("employee")) { // create a new instance of employee employee = new Employee(); } break; case XmlPullParser.TEXT: text = parser.getText(); break; case XmlPullParser.END_TAG: if (tagname.equalsIgnoreCase("employee")) { // add employee object to list employees.add(employee); }else if (tagname.equalsIgnoreCase("id")) { employee.setId(Integer.parseInt(text)); } else if (tagname.equalsIgnoreCase("name")) { employee.setName(text); } else if (tagname.equalsIgnoreCase("salary")) { employee.setSalary(Float.parseFloat(text)); } break; default: break; } eventType = parser.next(); } } catch (XmlPullParserException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();} return employees; }
} 

here public List<Employee> parse(InputStream is) this method returns the list of employees in your case this is a list of book for more information refer this link

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