android项目之RRS阅读器

ps:本程序是android网络技术开发详解书中的代码

项目截图：

代码片段： 

适配器布局的优化

public class MyAdapter extends BaseAdapter
{
  private LayoutInflater mInflater;
  private List<News> items;

  public MyAdapter(Context context, List<News> it)
  {
    mInflater = LayoutInflater.from(context);
    items = it;
  }

  @Override
  public int getCount()
  {
    return items.size();
  }

  @Override
  public Object getItem(int position)
  {
    return items.get(position);
  }

  @Override
  public long getItemId(int position)
  {
    return position;
  }

  @Override
  public View getView(int position, View convertView, ViewGroup par)
  {
    ViewHolder holder;
    if (convertView == null)
    {
      /* 使用自定义的news_row作为Layout */
      convertView = mInflater.inflate(R.layout.news_row, null);
      /* 初始化holder的text与icon */
      holder = new ViewHolder();
      holder.text = (TextView) convertView.findViewById(R.id.text);
      convertView.setTag(holder);
    } else
    {
      holder = (ViewHolder) convertView.getTag();
    }
    News tmpN = (News) items.get(position);
    holder.text.setText(tmpN.getTitle());

    return convertView;
  }

  /* class ViewHolder */
  private class ViewHolder
  {
    TextView text;
  }
}

XML的解析

package dfzy.RSSCH;

import java.util.ArrayList;
import java.util.List;
import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;

public class MyHandler extends DefaultHandler
{
  private boolean in_item = false;
  private boolean in_title = false;
  private boolean in_link = false;
  private boolean in_desc = false;
  private boolean in_date = false;
  private boolean in_mainTitle = false;
  private List<News> li;
  private News news;
  private String title = "";
  private StringBuffer buf = new StringBuffer();

  public List<News> getParsedData()
  {
    return li;
  }

  /* 将解析出的RSS title返回 */
  public String getRssTitle()
  {
    return title;
  }

  /* XML文件开始解析时调用此方法 */
  @Override
  public void startDocument() throws SAXException
  {
    li = new ArrayList<News>();
  }

  /* XML文件结束解析时调用此方法 */
  @Override
  public void endDocument() throws SAXException
  {
  }

  /* 解析到Element的开头时调用此方法 */
  @Override
  public void startElement(String namespaceURI, String localName,
      String qName, Attributes atts) throws SAXException
  {
    if (localName.equals("item"))
    {
      this.in_item = true;
      /* 解析到item的开头时new一个News对象 */
      news = new News();
    } else if (localName.equals("title"))
    {
      if (this.in_item)
      {
        this.in_title = true;
      } else
      {
        this.in_mainTitle = true;
      }
    } else if (localName.equals("link"))
    {
      if (this.in_item)
      {
        this.in_link = true;
      }
    } else if (localName.equals("description"))
    {
      if (this.in_item)
      {
        this.in_desc = true;
      }
    } else if (localName.equals("pubDate"))
    {
      if (this.in_item)
      {
        this.in_date = true;
      }
    }
  }

  /* 解析到Element的结尾时调用此方法 */
  @Override
  public void endElement(String namespaceURI, String localName,
      String qName) throws SAXException
  {
    if (localName.equals("item"))
    {
      this.in_item = false;
      /* 解析到item的结尾时将News对象写入List中 */
      li.add(news);
    } else if (localName.equals("title"))
    {
      if (this.in_item)
      {
        /* 设置News对象的title */
        news.setTitle(buf.toString().trim());
        buf.setLength(0);
        this.in_title = false;
      } else
      {
        /* 设置RSS的title */
        title = buf.toString().trim();
        buf.setLength(0);
        this.in_mainTitle = false;
      }
    } else if (localName.equals("link"))
    {
      if (this.in_item)
      {
        /* 设置News对象的link */
        news.setLink(buf.toString().trim());
        buf.setLength(0);
        this.in_link = false;
      }
    } else if (localName.equals("description"))
    {
      if (in_item)
      {
        /* 设置News对象的description */
        news.setDesc(buf.toString().trim());
        buf.setLength(0);
        this.in_desc = false;
      }
    } else if (localName.equals("pubDate"))
    {
      if (in_item)
      {
        /* 设置News对象的pubDate */
        news.setDate(buf.toString().trim());
        buf.setLength(0);
        this.in_date = false;
      }
    }
  }

  /* 取得Element的开头结尾中间夹的字符串 */
  @Override
  public void characters(char ch[], int start, int length)
  {
    if (this.in_item || this.in_mainTitle)
    {
      /* 将char[]添加StringBuffer */
      buf.append(ch, start, length);
    }
  }
}

    /* 设置mLink为网页连接 */
    Linkify.addLinks(mLink, Linkify.WEB_URLS);