如何获取rss feed android？

Question

我在这里有这个网址:http://www.webpronews.com/feeds

现在我需要获取feed并在android中显示它.任何线索？

Answer 1

我使用lib xmlpull_1_1_3_4c.jar,例如阅读下面的twitter feed(rss).

XML Pull是开源的.您只需根据Feed调整标记即可.如果您在网上找不到jar,我可以通过电子邮件发送给您.我不记得我从哪里得到它,它曾经是在xmlpull.org,但不知道它现在在哪里.我从http://www.ibm.com/developerworks/opensource/library/x-android/链接到了某个地方

import org.developerworks.android.FeedParser;
import org.developerworks.android.FeedParserFactory;
import org.developerworks.android.Message;
import org.developerworks.android.ParserType;
import org.xmlpull.v1.XmlSerializer;

....
loadFeed(ParserType.ANDROID_SAX);
....



private void loadFeed(ParserType type){
     try{
      Log.i("AndroidNews", "ParserType="+type.name());
      FeedParser parser = FeedParserFactory.getParser(type);
      long start = System.currentTimeMillis();
      messages = parser.parse();
      long duration = System.currentTimeMillis() - start;
      String xml = writeXml();      
      titles = new ArrayList<String>(messages.size());
      for (Message msg : messages){
       titles.add(msg.getTitle());
      }
     } catch (Throwable t){
      Log.e("AndroidNews",t.getMessage(),t);
     }
    }

private String writeXml() {


 XmlSerializer serializer = Xml.newSerializer();
  StringWriter writer = new StringWriter();
  try {
   serializer.setOutput(writer);
   serializer.startDocument("UTF-8", true);
   serializer.startTag("", "messages");
   serializer.attribute("", "number", String.valueOf(messages.size()));
   for (Message msg: messages){
    serializer.startTag("", "message");
    serializer.attribute("", "date", msg.getDate());
    serializer.startTag("", "title");
    serializer.text(msg.getTitle());
    serializer.endTag("", "title");
    serializer.startTag("", "url");
    serializer.text(msg.getLink().toExternalForm());
    serializer.endTag("", "url");
    serializer.startTag("", "body");
    serializer.text(msg.getDescription());
    serializer.endTag("", "body");
    serializer.endTag("", "message");
   }
   serializer.endTag("", "messages");
   serializer.endDocument();
   return writer.toString();
  } catch (Exception e) {
   throw new RuntimeException(e);
  }
 }

编辑:

这是使用ArrayAdapter将提要填充到列表视图的整个类,但是在任何数据库上都没有游标,因为我没有在本地存储提要:

import android.app.ProgressDialog;
import android.content.Intent;
import android.net.Uri;
import android.os.AsyncTask;
import android.os.Bundle;
import android.text.Html;
import android.util.Log;
import android.util.Xml;
import android.view.Gravity;
import android.view.View;
import android.widget.*;
import org.developerworks.android.FeedParser;
import org.developerworks.android.FeedParserFactory;
import org.developerworks.android.Message;
import org.developerworks.android.ParserType;
import org.xmlpull.v1.XmlSerializer;

import java.io.StringWriter;
import java.util.ArrayList;
import java.util.List;

public class Twitter extends BaseActivity implements
        AdapterView.OnItemClickListener {

    private List<Message> messages;
    private List<String> titles;

    //TweetsAdapter ta = new TweetsAdapter(this);
    public ListView lstTweets = null;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.twitter);

        // set header title
        ((TextView)findViewById(R.id.txtHeaderTitle)).setText( Html.fromHtml("<b>" + getResources().getString(R.string.activity_title_twitter) +"</b>"));

        // highlight icon
        ImageButton btn = (ImageButton)findViewById(R.id.btnTwitter);
        btn.setBackgroundResource(R.drawable.menu_icon_twitter_active);

        // load list of tweets
        lstTweets = (ListView)findViewById(R.id.lstTweets);
        lstTweets.setOnItemClickListener(this);

        new AsyncTask<Void, Void, Void>() {

            ProgressDialog p;
            boolean success = false;

            @Override
            protected void onPostExecute(Void aVoid) {
                p.dismiss();
                if (!success) {

                    Twitter.this.runOnUiThread(new Runnable() {
                        public void run() {
                            Toast toast = Toast.makeText(Twitter.this, "Sorry, could not connect to Twitter.", Toast.LENGTH_LONG);
                            toast.setGravity(Gravity.CENTER_VERTICAL|Gravity.CENTER_HORIZONTAL, 0, 0);
                            toast.show();
                        }
                    });

                } else {
                    ArrayAdapter<String> adapter =
                        new ArrayAdapter<String>(Twitter.this, R.layout.twitter_list_row,titles);
                    lstTweets.setAdapter(adapter);
                }
            }

            @Override
            protected void onPreExecute() {
                p  = ProgressDialog.show(Twitter.this,"Loading...","...please wait a moment.");
            }

            @Override
            protected Void doInBackground(Void... params) {
                try {
                    loadFeed(ParserType.ANDROID_SAX);
                    if (messages!=null&&messages.size()>0) success = true;
                } catch (RuntimeException e) {}
                catch (Exception e) {}
                return null;
            }
        }.execute();



    }


    public void onItemClick(AdapterView<?> adapterView, View view, int position, long l) {
  Intent viewMessage = new Intent(Intent.ACTION_VIEW,
    Uri.parse(messages.get(position).getLink().toExternalForm()));
  this.startActivity(viewMessage);
    }


 private void loadFeed(ParserType type){
     try{
      Log.i("AndroidNews", "ParserType="+type.name());
      FeedParser parser = FeedParserFactory.getParser(type);
      long start = System.currentTimeMillis();
      messages = parser.parse();
      long duration = System.currentTimeMillis() - start;
      String xml = writeXml();      
      titles = new ArrayList<String>(messages.size());
      for (Message msg : messages){
       titles.add(msg.getTitle());
      }
     } catch (Throwable t){
      Log.e("AndroidNews",t.getMessage(),t);
     }
    }

    private String writeXml(){
  XmlSerializer serializer = Xml.newSerializer();
  StringWriter writer = new StringWriter();
  try {
   serializer.setOutput(writer);
   serializer.startDocument("UTF-8", true);
   serializer.startTag("", "messages");
   serializer.attribute("", "number", String.valueOf(messages.size()));
   for (Message msg: messages){
    serializer.startTag("", "message");
    serializer.attribute("", "date", msg.getDate());
    serializer.startTag("", "title");
    serializer.text(msg.getTitle());
    serializer.endTag("", "title");
    serializer.startTag("", "url");
    serializer.text(msg.getLink().toExternalForm());
    serializer.endTag("", "url");
    serializer.startTag("", "body");
    serializer.text(msg.getDescription());
    serializer.endTag("", "body");
    serializer.endTag("", "message");
   }
   serializer.endTag("", "messages");
   serializer.endDocument();
   return writer.toString();
  } catch (Exception e) {
   throw new RuntimeException(e);
  }
 }
}