Android - 读取XML文件中的数据

读取XML中存储的数据。将xmlfile.xml存放在assets文件夹中。在activity_main.xml中创建一个textview，用来显示读取到的数据。

XML文件内容如下：xmlfile.xml

<?xml version="1.0" encoding="UTF-8"?>
<Languages cat="it">
	<lan id="1">
		<name>Java</name>
		<ide>Eclipse</ide>
		<type>面向对象</type>
	</lan>
	<lan id="2">
		<name>C</name>
		<ide>VS</ide>
		<type>面向过程</type>
	</lan>
	<lan id="3">
		<name>C#</name>
		<ide>vs</ide>
		<type>面向对象</type>
	</lan>
	
</Languages>

使用的是W3C的包。

用builderfactory来创建builder。并用builder打开assets的xml文件，创建出document。

读出document的element。从element中获取nodelist，再得到单个的node。注意要从item中取出字符内容。

import java.io.IOException;

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

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

import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.TextView;

public class MainActivity extends Activity {

	TextView text;
	
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		
		text = (TextView) findViewById(R.id.text);

		try {
			DocumentBuilderFactory builderFactory = DocumentBuilderFactory.newInstance();
			DocumentBuilder builder;
			builder = builderFactory.newDocumentBuilder();
			Document document = builder.parse(getAssets().open("xmlfile.xml"));
			Element element = document.getDocumentElement();
			NodeList nodeList = element.getElementsByTagName("lan");
			text.append("\n");
			for (int i = 0; i < nodeList.getLength(); i++) {
				Element lan = (Element) nodeList.item(i);
				text.append(lan.getAttribute("id") + "\n");
				text.append(lan.getElementsByTagName("name").item(0).getTextContent() + " ");
				text.append(lan.getElementsByTagName("ide").item(0).getTextContent() + " ");
				text.append(lan.getElementsByTagName("type").item(0).getTextContent() + " ");
				text.append("\n");
			}

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