Android实例RSS客户端开发(3)--rss列表并显示在ui上
修改main.java,调用前面的类,从intentert获取rss列表并显示在ui上:
public final String RSS_URL = "http://blog.sina.com.cn/rss/1267454277.xml";//从网络获取RSS地址
public final String tag = "RSSReader";
private RSSFeed feed = null;
/** Called when the activity is first created. */
public void onCreate(Bundle icicle) {
super.onCreate(icicle);
setContentView(R.layout.main);
feed = getFeed(RSS_URL);//调用getFeed方法,从服务器取得rss提要
showListView(); //把rss内容绑定到ui界面进行显示
}
private RSSFeed getFeed(String urlString) //该方法通过url获得xml并解析xml内容为RSSFeed对象
{
try
{
URL url = new URL(urlString);
SAXParserFactory factory = SAXParserFactory.newInstance();
SAXParser parser = factory.newSAXParser();
XMLReader xmlreader = parser.getXMLReader();
RSSHandler rssHandler = new RSSHandler();
xmlreader.setContentHandler(rssHandler);
InputSource is = new InputSource(url.openStream());
xmlreader.parse(is);
return rssHandler.getFeed();
}
catch (Exception ee)
{
return null;
}
}
private void showListView()
{
ListView itemlist = (ListView) findViewById(R.id.itemlist);
if (feed == null)
{
setTitle("访问的RSS无效");
return;
}
SimpleAdapter adapter = new SimpleAdapter(this, feed.getAllItemsForListView(),
android.R.layout.simple_list_item_2, new String[] { RSSItem.TITLE,RSSItem.PUBDATE },
new int[] { android.R.id.text1 , android.R.id.text2});
itemlist.setAdapter(adapter); //listview绑定适配器
itemlist.setOnItemClickListener(this); //设置itemclick事件代理
itemlist.setSelection(0);
}
public void onItemClick(AdapterView parent, View v, int position, long id) //itemclick事件代理方法
{
Intent itemintent = new Intent(this,ActivityShowDescription.class);//构建一个“意图”,用于指向activity :detail
Bundle b = new Bundle(); //构建buddle,并将要传递参数都放入buddle
b.putString("title", feed.getItem(position).getTitle());
b.putString("description", feed.getItem(position).getDescription());
b.putString("link", feed.getItem(position).getLink());
b.putString("pubdate", feed.getItem(position).getPubDate());
itemintent.putExtra("android.intent.extra.rssItem", b); //用android.intent.extra.INTENT的名字来传递参数
startActivityForResult(itemintent, 0);
}
}
到此,程序已经可以显示第1个activity(页面)了。但由于程序使用了网络,我们还必须在AndroidManifest.xml中增加使用网络的权限:
当我们点击一个item的时候,页面要跳转到另一个Activity,用来展现item里面的内容,所以需要建立一个新的Activity:ActivityShowDescription。
public class ActivityShowDescription extends Activity {
public void onCreate(Bundle icicle) {
super.onCreate(icicle);
setContentView(R.layout.showdescription);
String content = null;
Intent startingIntent = getIntent();
if (startingIntent != null) {
Bundle bundle = startingIntent
.getBundleExtra("android.intent.extra.rssItem");
if (bundle == null) {
content = "不好意思程序出错啦";
} else {
content = bundle.getString("title") + "\n\n"
+ bundle.getString("pubdate") + "\n\n"
+ bundle.getString("description").replace('\n', ' ')
+ "\n\n详细信息请访问以下网址:\n" + bundle.getString("link");
}
} else {
content = "不好意思程序出错啦";
}
TextView textView = (TextView) findViewById(R.id.content);
textView.setText(content);
Button backbutton = (Button) findViewById(R.id.back);
backbutton.setOnClickListener(new Button.OnClickListener() {
public void onClick(View v) {
finish();
}
});
}
}
它对应的xml文件如下:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:autoLink="all"
android:text=""
android:id="@+id/content"
android:layout_weight="1.0"
/>
<Button
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="返回"
android:id="@+id/back"
/>
</LinearLayout>
这样我们就完成了这个RSS小程序,运行效果如下:
posted on 2012-06-01 21:37 android开发实例 阅读(1210) 评论(0) 编辑 收藏 举报