Android Open Source - RssReader Rss Item List Fragment

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License

The source code is released under:

GNU General Public License

Java Source Code

/**
 * RssReader// www .j a v a  2 s. co m
 *
 * Copyright (c) 2013-2014 teejoe
 *
 *     This program is free software: you can redistribute it and/or modify
 *     it under the terms of the GNU General Public License as published by
 *     the Free Software Foundation, either version 3 of the License, or
 *     (at your option) any later version.
 *
 *     This program is distributed in the hope that it will be useful,
 *     but WITHOUT ANY WARRANTY; without even the implied warranty of
 *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *     GNU General Public License for more details.
 *
 *     You should have received a copy of the GNU General Public License
 *     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

package org.m2x.rssreader.fragment;

import java.util.ArrayList;

import android.database.Cursor;
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.ListView;

import com.actionbarsherlock.app.SherlockListFragment;

import org.m2x.rssreader.MainApplication;
import org.m2x.rssreader.R;
import org.m2x.rssreader.adapter.RssItemListAdapter;
import org.m2x.rssreader.provider.FeedData.EntryColumns;

/**
 * The RSS item list fragment.
 * @author teejoe(mtjm2x@gmail.com)
 *
 */
public class RssItemListFragment extends SherlockListFragment{

  public static final String EXTRA_URI = "Uri";
  
  private Uri mUri;
  private RssItemListAdapter mAdapter;
  
  // Listener of the RSS item selections.
  private OnRssItemSelectedListener mOnRssItemSelectedListener;
  
    /**
     * Represents a listener that will be notified of RSS item selections.
     */
    public interface OnRssItemSelectedListener {
        /**
         * Called when a given RSS item is selected.
         * @param index the index of the selected RSS item.
         */
        public void onRssItemSelected(int index);
    }
  
  @Override
  public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState){
  
    return inflater.inflate(R.layout.fragment_rss_item_list, container, false);
  }
  
  @Override
  public void onActivityCreated(Bundle savedInstanceState){
    super.onActivityCreated(savedInstanceState);
        
    mAdapter = new RssItemListAdapter(getActivity(), null);
    this.setListAdapter(mAdapter);
  }
  
  @Override
  public void onResume() {
    super.onResume();
    
    // Update the list data.
    if (mUri != null) {
      beginLoadData(mUri);
    }
  }
  
  /**
   * Set the listener of RSS item selections.
   * @param listener the listener to set.
   */
  public void setRssItemSelectedListener(OnRssItemSelectedListener listener){
    mOnRssItemSelectedListener = listener;
  }
  
  @Override
  public void onListItemClick (ListView list, View view, int position, long id){
  
    if (null != mOnRssItemSelectedListener){
      mOnRssItemSelectedListener.onRssItemSelected(position);
    }
  }
  
  /** Begin to load the list items asynchronously. */
  public void beginLoadData(Uri uri){
    mUri = uri;
    new RssItemListLoaderTask().execute(uri);
  }
  
  /** Get the RSS entry IDs of the channel or group. */
  public ArrayList<Long> getRssEntryIds() {
    return mAdapter.getRssEntryIds(); 
  }
  
  /** Set the content uri for RSS entries. */
  public void setUri(Uri uri) {
    mUri = uri;
  }
  
  /** AsyncTask to load the list items. Given a content URI, fetch feed data from
   *  the FeedDataProvider, then return the Cursor. */
  class RssItemListLoaderTask extends AsyncTask<Uri, Integer, Cursor> {

    @Override
    protected Cursor doInBackground(Uri... uri) {
      Cursor cursor = MainApplication.getContext().getContentResolver().query(
            uri[0],  
            null,
            null,
            null,
            EntryColumns.DATE + " DESC");
      
      return cursor;
    }
    
    @Override
    protected void onPostExecute(Cursor cursor){
      mAdapter.setCursor(cursor);
      mAdapter.notifyDataSetChanged();
    }
  }
}

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