XML 파서: DOM파서, SAX파서

XML 파서 (p400)

안드로이드에서는 3가지 XML 파서 방법이 지원된다. : DOM파서, SAX파서, XmlPullParser

1. xml로 데이터를 만든다.

경로는 res에 raw라는 폴더를 만든 뒤 그 안에서 파일 생성-student.xml이란 이름으로 만든다.

<person>

    <student>

        <name>홍길동</name>
        <age>30</age>
        <address>서울</address>
    </student>
    <student>
        <name>이순신</name>
        <age>40</age>
        <address>전라도</address>
    </student>

    <student>
        <name>강감찬</name>
        <age>50</age>
        <address>경상도</address>
    </student>

</person>

2. 레이아웃

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.progdv.dom.MainActivity">


    <LinearLayout
        android:orientation="vertical"
        android:layout_width="match_parent"
        android:layout_height="match_parent">


        <ListView
            android:background="#5a87cf"
            android:id="@+id/listView"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"/>

    </LinearLayout>

</RelativeLayout>

3. 메인 액티비티

package com.progdv.dom;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.widget.ArrayAdapter;
import android.widget.ListView;

import org.w3c.dom.Document;
import org.w3c.dom.NodeList;
import org.xml.sax.SAXException;

import java.io.IOException;
import java.io.InputStream;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;

public class MainActivity extends AppCompatActivity {

    ListView listView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        listView = (ListView)findViewById(R.id.listView);
        String[] data = xmlParsing();

        ArrayAdapter<String> adapter = new ArrayAdapter<String>(getApplicationContext(),
                android.R.layout.simple_list_item_1, data);
        listView.setAdapter(adapter);
    }

    public String[]  xmlParsing(){

        String[] data = null;

        try {
            InputStream is = getResources().openRawResource(R.raw.student);
            DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();

            DocumentBuilder builder = factory.newDocumentBuilder();
            Document doc = builder.parse(is);

            NodeList studentList = doc.getElementsByTagName("student");
            NodeList nameList = doc.getElementsByTagName("name");
            NodeList ageList = doc.getElementsByTagName("age");
            NodeList addressList = doc.getElementsByTagName("address");

            data = new String[studentList.getLength()];

            for(int i = 0; i < studentList.getLength(); i++) {
                String name = nameList.item(i).getFirstChild().getNodeValue();
                String age = ageList.item(i).getFirstChild().getNodeValue();
                String addr = addressList.item(i).getFirstChild().getNodeValue();

                data[i] = name + " " + age + " " + addr;
            }

        } catch (ParserConfigurationException e) {
            e.printStackTrace();
        } catch (SAXException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();

        }
        return data;
    }


}

웹에서의 자바스크립트와 같은 방법으로 데이터를 넘겨줌.