代码如下：

package com.example.xml;

import java.io.StringReader;

import javax.xml.parsers.SAXParserFactory;

import org.xml.sax.InputSource;
import org.xml.sax.XMLReader;

import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;

public class MainActivity extends Activity {

    private Button start  = null;
    private TextView display = null;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        start = (Button)findViewById(R.id.start);
        start.setOnClickListener(new StartOnClickListener());
    }

    public class StartOnClickListener implements OnClickListener{

        public void onClick(View v) {
            // TODO Auto-generated method stub
            //注意2点，第1:字符串中如果要换行写，则应该用引号和加号来相加得到，不能直接换行写
            //第2点：如果字符串中有字符，则用括号里面的符合(/")代替引号。
            //我这里用的xml文件直接为该程序layout的布局xml文件
//            String result_str =
//            "<RelativeLayout " +
//              "  xmlns:tools=/"http://schemas.android.com/tools/" " +
//              "  android:layout_width=/"match_parent/" " +
//              "  android:layout_height=/"match_parent/" > " +
//           
//             "   <Button  " +
//               "     android:id=/"@+id/start/"    " +
//                 "   android:layout_width=/"fill_parent/"    " +
//                  "  android:layout_height=/"wrap_content/"    " +
//                 "   android:layout_alignParentBottom=/"true/"    " +
//                  "  android:text=/"Start XML Parse/"    "    +
//                "    /> " +
//              "  <TextView " +
//                "    android:id=/"@+id/display/" " +
//               "     android:layout_width=/"fill_parent/"    " +
//                "    android:layout_height=/"fill_parent/"    " +
//                "    android:gravity=/"center/"    " +
//                "     android:layout_alignParentLeft=/"true/"    "    +
//                "     android:layout_above=/"@+id/start/"    "    +
//                "     android:text=/"The XML Parse Example!!/"    " +
//                "    />    " +
//        "    </RelativeLayout>";

            String result_str =        
             "   <Button  " +
               "     id=/"@+id/start/"    " +
                 "   layoutwidth=/"fillparent/"    " +
                  "  layoutheight=/"wrapcontent/"    " +
                 "   layoutalignParentBottom=/"true/"    " +
                  "  text=/"Start XML Parse/"    "    +
                "    </Button> " ;

           
            System.out.println(result_str);
            try{
                //创建SAX工厂
                SAXParserFactory factory = SAXParserFactory.newInstance();
                XMLReader reader = factory.newSAXParser().getXMLReader();
                reader.setContentHandler(new MyContentHandler());
                reader.parse(new InputSource(new StringReader(result_str)));
            }
            catch(Exception e) {
                e.printStackTrace();
            }

        }

    }
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.activity_main, menu);
        return true;
    }
}

MyContentHandler.java:
代码如下：

package com.example.xml;

import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;

public class MyContentHandler extends DefaultHandler {

    String tagname, sid, swidth, sheight, text, salign;

    //当解析到标签的属性栏时调用该方法
    @Override
    public void characters(char[] ch, int start, int length)
            throws SAXException {
        // TODO Auto-generated method stub
        if(tagname.equals("id"))
            sid = new String(ch, start, length);
        else if(tagname.equals("layoutwidth"))
            swidth = new String(ch, start, length);
        else if(tagname.equals("layoutheight"))
            sheight = new String(ch, start, length);
        else if(tagname.equals("layoutalignParentBottom"))
            salign = new String(ch, start, length);
        else if(tagname.equals("text"))
            text = new String(ch, start, length);
        super.characters(ch, start, length);
    }

    //解析文档结束调用
    @Override
    public void endDocument() throws SAXException {
        // TODO Auto-generated method stub
        System.out.println("........end.......");
        super.endDocument();
    }

    //解析标签结束时调用
    @Override
    public void endElement(String uri, String localName, String qName)
            throws SAXException {
        // TODO Auto-generated method stub
        if(tagname.equals("Button")) {
            this.printout();
        }
        super.endElement(uri, localName, qName);
    }

    //解析文档开始时调用
    @Override
    public void startDocument() throws SAXException {
        // TODO Auto-generated method stub
        System.out.println("........begin.......");
        super.startDocument();
    }

    //标签开始时执行
    @Override
    public void startElement(String uri, String localName, String qName,
            Attributes attributes) throws SAXException {
        // TODO Auto-generated method stub
        tagname = localName;
        if(tagname.equals("Button")) {
            for(int i = 0; i < attributes.getLength(); i++) {       
                //得到第i个属性的名字和值
                System.out.println(attributes.getLocalName(i) + "=" + attributes.getValue(i));
            }

        }
        super.startElement(uri, localName, qName, attributes);
    }

    //输出标签属性解析结果
    private void printout() {
        System.out.print("id: ");
        System.out.println(sid);
        System.out.print("layout_width: ");
        System.out.println(swidth);
        System.out.print("layout_height: ");
        System.out.println(sheight);
        System.out.print("layout_alignParentBottom: ");
        System.out.println(salign);
        System.out.print("text: ");
        System.out.println(text);
    }

}