android 应用DOM解析xml

android 使用DOM解析xml
美国地震信息网http://earthquake.usgs.gov/earthquakes/catalogs/1day-M2.5.xml

public class EarthquakeList extends Activity {
 
  ListView list;
  EarthQuakeInfo selectedQuake;

  ArrayAdapter<EarthQuakeInfo> adapter;
  ArrayList<EarthQuakeInfo> infoList = new ArrayList<EarthQuakeInfo>();
 
  @Override
  public void onCreate(Bundle icicle) {
    super.onCreate(icicle);
   
    setContentView(R.layout.main); //设置用户界面

    list = (ListView)this.findViewById(R.id.list);
   
    //设置ListView的内容为infoList
    adapter = new ArrayAdapter<EarthQuakeInfo>(this,android.R.layout.simple_list_item_1,infoList);
    //设置ListView的适配器为adapter
    list.setAdapter(adapter);

    getInfo(); //获得infoList的具体内容，这样ListView才有地震信息可以显示
  }
 
  /** 刷新数据，获得最新地址信息 */
  private void getInfo() {
  // 获得XML
  URL url;
  try {
    String feed = getString(R.string.feed);
    url = new URL(feed);
        
    URLConnection connection = url.openConnection();
      
    HttpURLConnection httpConnection = (HttpURLConnection)connection;
    int responseCode = httpConnection.getResponseCode();

    if (responseCode == HttpURLConnection.HTTP_OK) {
      InputStream in = httpConnection.getInputStream();
         
      DocumentBuilderFactory dbfactory = DocumentBuilderFactory.newInstance();
      DocumentBuilder db = dbfactory.newDocumentBuilder();

      // 解析地震feed
      Document dom = db.parse(in);     
      Element docEle = dom.getDocumentElement();
       
      // 清空旧的地震信息
      infoList.clear();
         
      // 获得地震信息的列表
      NodeList nl = docEle.getElementsByTagName("entry");
      if (nl != null && nl.getLength() > 0) {
        for (int i = 0 ; i < nl.getLength(); i++) {
          Element entry = (Element)nl.item(i);
          Element title = (Element)entry.getElementsByTagName("title").item(0);
          Element geo = (Element)entry.getElementsByTagName("georss:point").item(0);
          Element when = (Element)entry.getElementsByTagName("updated").item(0);

          String details = title.getFirstChild().getNodeValue();
          String point = geo.getFirstChild().getNodeValue();
          String date = when.getFirstChild().getNodeValue(); 
          SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd'T'hh:mm:ss'Z'");
          Date qdate = new GregorianCalendar(0,0,0).getTime();
          try {
            qdate = sdf.parse(date);
          } catch (ParseException e) {
            e.printStackTrace();
          }

          String[] location = point.split(" ");
          Location loc = new Location("dummyGPS");
          loc.setLatitude(Double.parseDouble(location[0]));
          loc.setLongitude(Double.parseDouble(location[1]));

          String magnitudeString = details.split(" ")[1];
          int end =  magnitudeString.length()-1;
          double magnitude = Double.parseDouble(magnitudeString.substring(0, end));
             
          details = details.split(",")[1].trim();
             
          EarthQuakeInfo info = new EarthQuakeInfo(qdate, details, loc, magnitude);

          // 处理新的地震信息
          newEntry(info);
        }
      }
    }
  } catch (Exception e) {
    e.printStackTrace();
  }
  }

  //新的地震信息
  private void newEntry(EarthQuakeInfo info) {
  // 将新的地址信息条目加入列表中
  infoList.add(info);

  // 通知array adapter
  adapter.notifyDataSetChanged();
}
//地震信息类
  public class EarthQuakeInfo {
      public Date date;
      public String details;
      public Location location;
      public double magnitude;
     
      public EarthQuakeInfo(Date d, String de, Location loc, double mag) {
        date = d;
        details = de;
        location = loc;
        magnitude = mag;
      }

      @Override
      public String toString() {
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd' 'hh:mm:ss");
        return sdf.format(date)
            + "\n 里氏"
            + magnitude
            + "级 \n "
            + details;
      }
    }
}