Android 如何使用dom解析器从xml解析中获取数据?
我不熟悉xml解析。在我的xml解析中,数据就是这样Android 如何使用dom解析器从xml解析中获取数据?,android,xml,parsing,Android,Xml,Parsing,我不熟悉xml解析。在我的xml解析中,数据就是这样 <popularmakes> <make> <name>Maruti Suzuki</name> <brandlogo> <ldpi><![CDATA[http://www.cartrade.com/images/logos/png/68/Maruti-Suzuki.png]]></ldpi>
<popularmakes>
<make>
<name>Maruti Suzuki</name>
<brandlogo>
<ldpi><![CDATA[http://www.cartrade.com/images/logos/png/68/Maruti-Suzuki.png]]></ldpi>
<mdpi><![CDATA[http://www.cartrade.com/images/logos/png/90/Maruti-Suzuki.png]]></mdpi>
</brandlogo>
</make>
<name>Maruti Suzuki</name>
<brandlogo>
<ldpi><![CDATA[http://www.cartrade.com/images/logos/png/68/Maruti-Suzuki.png]]></ldpi>
<mdpi><![CDATA[http://www.cartrade.com/images/logos/png/90/Maruti-Suzuki.png]]></mdpi>
</brandlogo>
</make>
.......
.......
.......
<name>Maruti Suzuki</name>
<brandlogo>
<ldpi><![CDATA[http://www.cartrade.com/images/logos/png/68/Maruti-Suzuki.png]]></ldpi>
<mdpi><![CDATA[http://www.cartrade.com/images/logos/png/90/Maruti-Suzuki.png]]></mdpi>
</brandlogo>
</make>
</popularmakes>
<othermakes>
<make>
<name>Maruti Suzuki</name>
<brandlogo>
<ldpi><![CDATA[http://www.cartrade.com/images/logos/png/68/Maruti-Suzuki.png]]></ldpi>
<mdpi><![CDATA[http://www.cartrade.com/images/logos/png/90/Maruti-Suzuki.png]]></mdpi>
</brandlogo>
</make>
<name>Maruti Suzuki</name>
<brandlogo>
<ldpi><![CDATA[http://www.cartrade.com/images/logos/png/68/Maruti-Suzuki.png]]></ldpi>
<mdpi><![CDATA[http://www.cartrade.com/images/logos/png/90/Maruti-Suzuki.png]]></mdpi>
</brandlogo>
</make>
.......
.......
.......
<name>Maruti Suzuki</name>
<brandlogo>
<ldpi><![CDATA[http://www.cartrade.com/images/logos/png/68/Maruti-Suzuki.png]]></ldpi>
<mdpi><![CDATA[http://www.cartrade.com/images/logos/png/90/Maruti-Suzuki.png]]></mdpi>
</brandlogo>
</make>
</othermakes>
玛鲁蒂铃木
玛鲁蒂铃木
.......
.......
.......
玛鲁蒂铃木
玛鲁蒂铃木
玛鲁蒂铃木
.......
.......
.......
玛鲁蒂铃木
在这篇文章中,我使用dom解析器来获取数据。但我无法做到这一点。我在谷歌搜索了很多,但所有样本都只有一个节点数据。在这篇xml解析文章中,如何获取名称和brandlogo,即图像ldpi和mdpi。特别是如何获取brandlogo内部的数据,即ldpi和mdpi。我的问题是ldpi和mdpi CDATA的内部可用。因此我无法解析数据。因此请建议我如何进行解析。提前感谢所有..android DOM Xml解析示例 activity_main.xml
<RelativeLayout xmlns:androclass="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"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:layout_marginLeft="75dp"
android:layout_marginTop="46dp"
android:text="TextView" />
</RelativeLayout>
从托盘中拖动一个文本视图。现在,activity_main.xml文件如下所示:
文件:activity_main.xml
<RelativeLayout xmlns:androclass="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"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:layout_marginLeft="75dp"
android:layout_marginTop="46dp"
android:text="TextView" />
</RelativeLayout>
xml文档
在项目的资产目录中创建一个名为file.xml的xml文件。
文件:File.xml
<?xml version="1.0"?>
<records>
<employee>
<name>Sachin Kumar</name>
<salary>50000</salary>
</employee>
<employee>
<name>Rahul Kumar</name>
<salary>60000</salary>
</employee>
<employee>
<name>John Mike</name>
<salary>70000</salary>
</employee>
</records>
萨钦·库马尔
50000
拉胡尔·库马尔
60000
约翰·迈克
70000
活动课
让我们编写使用dom解析器解析xml的代码。
文件:MainActivity.java
import java.io.InputStream;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import android.app.Activity;
import android.os.Bundle;
import android.widget.TextView;
public class MainActivity extends Activity {
TextView tv1;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
tv1=(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;
tv1.setText(tv1.getText()+"\nName : " + getValue("name", element2)+"\n");
tv1.setText(tv1.getText()+"Salary : " + getValue("salary", element2)+"\n");
tv1.setText(tv1.getText()+"-----------------------");
}
}//end of for loop
} catch (Exception e) {e.printStackTrace();}
}
private static String getValue(String tag, Element element) {
NodeList nodeList = element.getElementsByTagName(tag).item(0).getChildNodes();
Node node = (Node) nodeList.item(0);
return node.getNodeValue();
}
}
import java.io.InputStream;
导入javax.xml.parsers.DocumentBuilder;
导入javax.xml.parsers.DocumentBuilderFactory;
导入org.w3c.dom.Document;
导入org.w3c.dom.Element;
导入org.w3c.dom.Node;
导入org.w3c.dom.NodeList;
导入android.app.Activity;
导入android.os.Bundle;
导入android.widget.TextView;
公共类MainActivity扩展活动{
文本视图tv1;
@凌驾
创建时的公共void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
tv1=(TextView)findViewById(R.id.textView1);
试试{
InputStream is=getAssets().open(“file.xml”);
DocumentBuilderFactory dbFactory=DocumentBuilderFactory.newInstance();
DocumentBuilder dBuilder=dbFactory.newDocumentBuilder();
Document doc=dBuilder.parse(is);
Element=doc.getDocumentElement();
元素。normalize();
NodeList nList=doc.getElementsByTagName(“员工”);
对于(inti=0;i创建一个名为XmlParser的类
public class XMLParser {
// constructor
public XMLParser() {
}
/**
* Getting XML from URL making HTTP request
* @param url string
* */
public String getXmlFromUrl(String url) {
String xml = null;
try {
// defaultHttpClient
DefaultHttpClient httpClient = new DefaultHttpClient();
HttpPost httpPost = new HttpPost(url);
HttpResponse httpResponse = httpClient.execute(httpPost);
HttpEntity httpEntity = httpResponse.getEntity();
xml = EntityUtils.toString(httpEntity);
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
// return XML
return xml;
}
/**
* Getting XML DOM element
* @param XML string
* */
public Document getDomElement(String xml){
Document doc = null;
DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
try {
DocumentBuilder db = dbf.newDocumentBuilder();
InputSource is = new InputSource();
is.setCharacterStream(new StringReader(xml));
doc = db.parse(is);
} catch (ParserConfigurationException e) {
Log.e("Error: ", e.getMessage());
return null;
} catch (SAXException e) {
Log.e("Error: ", e.getMessage());
return null;
} catch (IOException e) {
Log.e("Error: ", e.getMessage());
return null;
}
return doc;
}
/** Getting node value
* @param elem element
*/
public final String getElementValue( Node elem ) {
Node child;
if( elem != null){
if (elem.hasChildNodes()){
for( child = elem.getFirstChild(); child != null; child = child.getNextSibling() ){
if( child.getNodeType() == Node.TEXT_NODE ){
return child.getNodeValue();
}
}
}
}
return "";
}
/**
* Getting node value
* @param Element node
* @param key string
* */
public String getValue(Element item, String str) {
NodeList n = item.getElementsByTagName(str);
return this.getElementValue(n.item(0));
}
}
在asyncTask的doinBg方法中,生成以下代码:
ArrayList<HashMap<String, String>> urList = new ArrayList<HashMap<String, String>>();
XMLParser parser = new XMLParser();
String xml = parser.getXmlFromUrl(URL); // getting XML from URL
Document doc = parser.getDomElement(xml); // getting DOM element
NodeList nl = doc.getElementsByTagName("make");
// looping through all song nodes <song>
for (int i = 0; i < nl.getLength(); i++) {
// creating new HashMap
HashMap<String, String> map = new HashMap<String, String>();
Element e = (Element) nl.item(i);
// adding each child node to HashMap key => value
map.put("name", parser.getValue(e, "name"));
map.put("ldpi", parser.getValue(e, "ldpi"));
map.put("mdpi", parser.getValue(e, "mdpi"));
// adding HashList to ArrayList
urList .add(map);
}
ArrayList urList=new ArrayList();
XMLParser=新的XMLParser();
字符串xml=parser.getXmlFromUrl(URL);//从URL获取xml
Document doc=parser.getDomeElement(xml);//获取DOM元素
NodeList nl=doc.getElementsByTagName(“make”);
//循环通过所有歌曲节点
对于(int i=0;ivalue
map.put(“name”,parser.getValue(e,“name”);
map.put(“ldpi”,parser.getValue(e,“ldpi”);
map.put(“mdpi”,parser.getValue(e,“mdpi”);
//将哈希列表添加到ArrayList
urList.add(map);
}
希望您现在知道如何使用arraylist。祝您编码愉快
如果有任何问题,请告诉我。显示您所做的一些代码。这样我们可以在其中进行编辑以使youname更容易使用。value正在工作,但ldpi和mdpi位于brandlogo内部,因此不会出现图像URL