Android線程XML閱讀器方法

Question

我怎樣才能線程方法readRss（），以便如果互聯網連接速度慢，它不會減慢應用程序的其餘部分？

package com.noah.rss; 

import java.io.IOException; 
import java.net.MalformedURLException; 
import java.net.URL; 
import java.util.List; 

import javax.xml.parsers.ParserConfigurationException; 
import javax.xml.parsers.SAXParser; 
import javax.xml.parsers.SAXParserFactory; 

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

import android.app.ListActivity; 
import android.content.Context; 
import android.content.Intent; 
import android.os.Bundle; 
import android.view.Menu; 
import android.view.MenuItem; 
import android.view.View; 
import android.view.ViewGroup; 
import android.widget.ArrayAdapter; 
import android.widget.ListView; 
import android.widget.TextView; 
import android.widget.Toast; 
import android.view.LayoutInflater; 

public class AndroidRssReader extends ListActivity { 

    private RSSFeed myRssFeed = null; 

    /** Called when the activity is first created. */ 
    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.main); 
     readRss(); 
    } 

    public class MyCustomAdapter extends ArrayAdapter<RSSItem> { 

     public MyCustomAdapter(Context context, int textViewResourceId, List<RSSItem> list) { 
      super(context, textViewResourceId, list); 
     } 

     @Override 
     public View getView(int position, View convertView, ViewGroup parent) { 
      // return super.getView(position, convertView, parent); 

      View row = convertView; 

      if (row == null) { 
       LayoutInflater inflater = getLayoutInflater(); 
       row = inflater.inflate(R.layout.row, parent, false); 
      } 

      TextView listTitle = (TextView) row.findViewById(R.id.listtitle); 
      listTitle.setText(myRssFeed.getList().get(position).getTitle()); 
      TextView listPubdate = (TextView) row.findViewById(R.id.listpubdate); 
      listPubdate.setText(myRssFeed.getList().get(position).getPubdate()); 

      if (position % 2 == 0) { 
       listTitle.setBackgroundColor(0xff101010); 
       listPubdate.setBackgroundColor(0xff101010); 
      } else { 
       listTitle.setBackgroundColor(0xff080808); 
       listPubdate.setBackgroundColor(0xff080808); 
      } 
      return row; 
     } 

     private void readRss() { 
      try { 
       URL rssUrl = new URL("http://www.gov.hk/en/about/rss/govhkrss.data.xml"); 
       SAXParserFactory mySAXParserFactory = SAXParserFactory.newInstance(); 
       SAXParser mySAXParser = mySAXParserFactory.newSAXParser(); 
       XMLReader myXMLReader = mySAXParser.getXMLReader(); 
       RSSHandler myRSSHandler = new RSSHandler(); 
       myXMLReader.setContentHandler(myRSSHandler); 
       InputSource myInputSource = new InputSource(rssUrl.openStream()); 
       myXMLReader.parse(myInputSource); 

       myRssFeed = myRSSHandler.getFeed(); 

      } catch (MalformedURLException e) { 
       e.printStackTrace(); 
      } catch (ParserConfigurationException e) { 
       e.printStackTrace(); 
      } catch (SAXException e) { 
       e.printStackTrace(); 
      } catch (IOException e) { 
       e.printStackTrace(); 
      } 

      if (myRssFeed != null) { 
       TextView feedTitle = (TextView) findViewById(R.id.feedtitle); 
       TextView feedDescribtion = (TextView) findViewById(R.id.feeddescribtion); 
       TextView feedPubdate = (TextView) findViewById(R.id.feedpubdate); 
       TextView feedLink = (TextView) findViewById(R.id.feedlink); 
       feedTitle.setText(myRssFeed.getTitle()); 
       feedDescribtion.setText(myRssFeed.getDescription()); 
       feedPubdate.setText(myRssFeed.getPubdate()); 
       feedLink.setText(myRssFeed.getLink()); 

       MyCustomAdapter adapter = new MyCustomAdapter(this, R.layout.row, myRssFeed.getList()); 
       setListAdapter(adapter); 
      } 
    } 

    @Override 
    protected void onListItemClick(ListView l, View v, int position, long id) { 
     Intent intent = new Intent(this, ShowDetails.class); 
     Bundle bundle = new Bundle(); 
     bundle.putString("keyTitle", myRssFeed.getItem(position).getTitle()); 
     bundle.putString("keyDescription", myRssFeed.getItem(position).getDescription()); 
     bundle.putString("keyLink", myRssFeed.getItem(position).getLink()); 
     bundle.putString("keyPubdate", myRssFeed.getItem(position).getPubdate()); 
     intent.putExtras(bundle); 
     startActivity(intent); 
    } 

    @Override 
    public boolean onCreateOptionsMenu(Menu menu) { 
     menu.add(0, 0, 0, "Reload"); 
     return true; 
    } 

    @Override 
    public boolean onOptionsItemSelected(MenuItem item) { 
     switch (item.getItemId()) { 
     case (0): 
       Toast.makeText(this, "Reading News, Please wait.", 
       Toast.LENGTH_LONG).show(); 
       readRss(); 
       break; 
      default: 
       break; 
     } 
     return true; 
    } 
} 

Answer 1

使用AsyncTask，這將創建一個單獨的線程來解析，因此它不會消耗你的UI線程。 :)

這是Informative樣品，祝你好運！