是否可以在Android中使用DOM解析器解析特定的XML？

使用进行解析会容易得多XmlPullParser，并且效率也更高

前任。XML文件内容（在外部存储中另存为code.xml）

<?xml version="1.0" encoding="utf-8"?>
<countries>
 <country>
   <name>Iran</name>
   <phonecode>+98</phonecode>
   <code>IRI</code>
 </country>
 <country>
   <name>United State</name>
   <phonecode>+1</phonecode>
   <code>USA</code>
 </country>
</countries>

让我们开始解析它

1. 首先创建一个Helper类

   import android.util.Xml;
   import org.xmlpull.v1.XmlPullParser;
   import org.xmlpull.v1.XmlPullParserException;
   import java.io.IOException;
   import java.io.InputStream;
   
   public class XmlDataParseHelper {
   
   private XmlPullParser parser;
   private static final String NULL = null;
   
   /**
    * 
    * @param in
    * @throws XmlPullParserException
    * @throws IOException
    * @throws IllegalArgumentException
    */
   public XmlDataParseHelper(InputStream in) throws XmlPullParserException,
           IOException, IllegalArgumentException {
       try {
           parser = Xml.newPullParser();
           parser.setFeature(XmlPullParser.FEATURE_PROCESS_NAMESPACES, false);
           parser.setInput(in, null);
           parser.nextTag();
       } catch (Exception e) {
           e.printStackTrace();
       }
   }
   
   /**
    * 
    * @return XmlPullParser
    */
   public XmlPullParser getParser() {
       return parser;
   }
   
   /**
    * 
    * @param parser
    * @param tag
    * @return String
    * @throws IOException
    * @throws XmlPullParserException
    */
   public static String readTag(XmlPullParser parser, String tag)
           throws IOException, XmlPullParserException {
       String tagData = "";
       parser.require(XmlPullParser.START_TAG, NULL, tag);
       if (parser.next() == XmlPullParser.TEXT) {
           tagData = parser.getText();
           parser.nextTag();
       }
       parser.require(XmlPullParser.END_TAG, NULL, tag);
       return tagData;
   }
   
   /**
    * 
    * @param parser
    * @param tag
    * @param attributeName
    * @return String
    * @throws IOException
    * @throws XmlPullParserException
    */
   public static String readAttribute(XmlPullParser parser, String tag,
           String attributeName) throws IOException, XmlPullParserException {
       parser.require(XmlPullParser.START_TAG, NULL, tag);
       String attributeData = parser.getAttributeValue(NULL, attributeName);
       parser.nextTag();
       parser.require(XmlPullParser.END_TAG, NULL, tag);
       return attributeData;
   }
   
   }
   

2. 读取xml文件为

   public InputStream readFile(String fileName) throws FileNotFoundException,
           IOException {
   //check external storage present
   // else throw new IOException();
   
   return new FileInputStream(Environment.getExternalStorageDirectory()
           + "/" + fileName);
   }
   

3. 将InputStream传递给另一个方法，该方法初始化XMLPullParser对象

    public void readXmlFile(String fileName) {
    try {
       if (fileName.isEmpty())
       throw new NullPointerException();
       readData(new XmlDataParseHelper(readFile(fileName)).getParser());
    } catch (IOException e) {
          e.printStackTrace();
    } catch (XmlPullParserException e) {
          e.printStackTrace();
    } catch (IllegalArgumentException e) {
          e.printStackTrace();
    }
    }
   

4. Atlast将XMLPullParser objectas解析为

     public void readData(XmlPullParser parser)
               throws XmlPullParserException, IOException {
   int eventType = parser.getEventType();
   String tagName = "";
   Log.w("Developer", "Reading file...");
   while (eventType != XmlPullParser.END_DOCUMENT) {
       switch (eventType) {
           case XmlPullParser.START_DOCUMENT :
               Log.w("Developer", "Reading backup file...");
               break;
           case XmlPullParser.START_TAG :
               tagName = parser.getName();
               if (tagName.equals("countries")) {
                   Log.w("XMLParse", "Start TAG countries");
                   // do something when countries tag starts
               }
               if (tagName.equals("country")) {
                   Log.w("XMLParse", "Start TAG country");
                   // do some when country tag starts
               } else if (tagName.equals("name")) {
                   // read tag value using XmlDataParseHelper class
                   String countryName = XmlDataParseHelper.readTag(parser,
                                   "name");
                   Log.w("XmlParser", "Country name : "+countryName);
               } else if (tagName.equals("phonecode")) {
                   String countryPhoneCode = 
                                 XmlDataParseHelper.readTag(parser,"phonecode");
                   Log.w("XmlParser", "Country Phone code : "+countryPhoneCode);
               } else if (tagName.equals("code")) {
                   String countryCode = 
                                XmlDataParseHelper.readTag(parser, "code");
                   Log.w("XmlParser", "Country code name : "+countryCode); 
               }
           break;
           case XmlPullParser.END_TAG :
               tagName = parser.getName();
               if (tagName.equals("countries")) {
                     // do something when counties tag is close.
               }           
           break;
       }
       eventType = parser.next();
   }
   Log.w("Developer", "File parsing complete...");
    }
   

5. 要读取文件，只需readXmlFile(String fileName)使用存储在外部存储器中的文件名在AsyncTask中调用该方法。

整个android工作示例代码位于https://gist.github.com/rachitrm/7810837或分叉项目http://www.github.com/rachitrm/rm-xmlparser/