Question

我尝试修改此代码http://code.google.com/p/krvarma-android-samples/source/browse/trunk/RSSReader/src/com/varma/samples/rssreader/ui/RSSListActivity.java

为了使它与我的程序一起工作，看起来我的解析工作正常，但是列表没有显示，并且我确定我的其余资源与上面的链接相同，我希望它会混乱明显的东西？

import java.net.URL;
import java.util.ArrayList;
import java.util.List;

import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;
import org.xml.sax.InputSource;
import org.xml.sax.XMLReader;

import com.actionbarsherlock.app.SherlockListFragment;
import android.app.ListActivity;
import android.app.ProgressDialog;
import android.content.Context;
import android.content.Intent;
import android.net.Uri;
import android.os.AsyncTask;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.TextView;

public class newsFragment extends SherlockListFragment{

    private ArrayList<RSSItem> itemlist = null;
    private RSSListAdaptor rssadaptor = null;

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

        itemlist = new ArrayList<RSSItem>();

        new RetrieveRSSFeeds().execute();
    }

    @Override
public void onListItemClick(ListView l, View v, int position, long id) {
    super.onListItemClick(l, v, position, id);

    RSSItem data = itemlist.get(position);

    Intent intent = new Intent(Intent.ACTION_VIEW,Uri.parse(data.link));

    startActivity(intent);
}

private void retrieveRSSFeed(String urlToRssFeed,ArrayList<RSSItem> list)
{
    try
    {
       URL url = new URL(urlToRssFeed);
       SAXParserFactory factory = SAXParserFactory.newInstance();
       SAXParser parser = factory.newSAXParser();
       XMLReader xmlreader = parser.getXMLReader();
       RSSParser theRssHandler = new RSSParser(list);

       xmlreader.setContentHandler(theRssHandler);

       InputSource is = new InputSource(url.openStream());

       xmlreader.parse(is);
    }
    catch (Exception e)
    {
        e.printStackTrace();
    }
}

private class RetrieveRSSFeeds extends AsyncTask<Void, Void, Void>
{
    private ProgressDialog progress = null;

    @Override
    protected Void doInBackground(Void... params) {
        retrieveRSSFeed("http://www.krvarma.com/feed",itemlist);

        rssadaptor = new RSSListAdaptor(getActivity(), R.layout.rssitemview,itemlist);

        return null;
    }

    @Override
    protected void onCancelled() {
        super.onCancelled();
    }

    @Override
    protected void onPreExecute() {
        progress = ProgressDialog.show(
                getActivity(), null, "Loading RSS Feeds...");

        super.onPreExecute();
    }

    @Override
    protected void onPostExecute(Void result) {
        setListAdapter(rssadaptor);

        progress.dismiss();

        super.onPostExecute(result);
    }

    @Override
    protected void onProgressUpdate(Void... values) {
        super.onProgressUpdate(values);
    }
}

private class RSSListAdaptor extends ArrayAdapter<RSSItem>{
    private List<RSSItem> objects = null;

    public RSSListAdaptor(Context context, int textviewid, List<RSSItem> objects) {
        super(context, textviewid, objects);

        this.objects = objects;
    }

    @Override
    public int getCount() {
        return ((null != objects) ? objects.size() : 0);
    }

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

    @Override
    public RSSItem getItem(int position) {
        return ((null != objects) ? objects.get(position) : null);
    }

    public View getView(int position, View convertView, ViewGroup parent) {
        View view = convertView;

        if(null == view)
        {
            LayoutInflater vi = (LayoutInflater)getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            view = vi.inflate(R.layout.rssitemview, null);
        }

        RSSItem data = objects.get(position);

        if(null != data)
        {
            TextView title = (TextView)view.findViewById(R.id.txtTitle);
            TextView date = (TextView)view.findViewById(R.id.txtDate);
            TextView description = (TextView)view.findViewById(R.id.txtDescription);

            title.setText(data.title);
            date.setText("on " + data.date);
            description.setText(data.description);
        }

        return view;
    }
}
}

提前致谢

Answer 1

我认为代码的主要问题是这一行：

getActivity().setContentView(R.layout.news_layout);

有没有理由为什么你决定从片段的onCreate()方法设置活动的内容视图，这个片段可能是在那个布局文件中声明的？删除上面的行，让活动管理自己的布局文件。

Listfragment没有显示列表

1 个答案: