XML代表可扩展标记语言。XML是一种非常流行的格式,通常用于在Internet上共享数据。本章介绍如何解析XML文件并从中提取必要的信息。
android提供三种类型的XML解析器,分别是dom、sax和xmlpullparser。其中android推荐使用xmlpullparser,因为它既高效又易于使用。所以我们将使用xmlpullparser来解析XML。
首先先在Assets目录下创建file.xml 加入如下的内容
<?xml version="1.0"?>
<records>
<employee>
<name>张飞</name>
<surname>张</surname>
<salary>50000</salary>
</employee>
<employee>
<name>孙权 </name>
<surname>孙</surname>
<salary>60000</salary>
</employee>
<employee>
<name>鲁智深</name>
<surname>鲁</surname>
<salary>70000</salary>
</employee>
</records>
接着修改activity_main.xml 布局文件的内容
<?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"
tools:context=".MainActivity">
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</RelativeLayout>
编写activity代码
package com.example.abc.xmlpaserdemo;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.TextView;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import java.io.InputStream;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
public class MainActivity extends AppCompatActivity {
TextView tv;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
tv=(TextView)findViewById(R.id.textView1);
try {
InputStream is = getAssets().open("file.xml");
DocumentBuilderFactory dbFactory = DocumentBuilderFactory.newInstance();
DocumentBuilder dBuilder = dbFactory.newDocumentBuilder();
Document doc = dBuilder.parse(is);
Element element=doc.getDocumentElement();
element.normalize();
NodeList nList = doc.getElementsByTagName("employee");
for (int i=0; i<nList.getLength(); i++) {
Node node = nList.item(i);
if (node.getNodeType() == Node.ELEMENT_NODE) {
Element element2 = (Element) node;
tv.setText(tv.getText()+"\nName : " + getValue("name", element2)+"\n");
tv.setText(tv.getText()+"Surname : " + getValue("surname", element2)+"\n");
tv.setText(tv.getText()+"-----------------------");
}
}
} catch (Exception e) {e.printStackTrace();}
}
private static String getValue(String tag, Element element) {
NodeList nodeList = element.getElementsByTagName(tag).item(0).getChildNodes();
Node node = nodeList.item(0);
return node.getNodeValue();
}
}
效果图