Android Open Source - RssReader Channel List Fragment

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License

The source code is released under:

GNU General Public License

Java Source Code

/**
 * RssReader// w ww.j a va 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 org.m2x.rssreader.adapter.ChannelListAdapter;
import org.m2x.rssreader.provider.FeedData.FeedColumns;
import org.m2x.rssreader.MainApplication;
import org.m2x.rssreader.R;


import android.database.Cursor;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemLongClickListener;
import android.widget.ListView;
import com.actionbarsherlock.app.SherlockListFragment;


/**
 * The channel list fragment, including a ListView that shows all
 * the RSS channel titles that user have subscribed and corresponding refresh count.
 * If the user clicks the channel list item, it will navigate to the RSS item list 
 * for that channel.
 * @author teejoe(mtjm2x@gmail.com)
 *
 */
public class ChannelListFragment extends SherlockListFragment {
  

  // The channel list adapter.
  private ChannelListAdapter mAdapter;
  
    // The listener to notify when a channel is selected
    private OnChannelSelectedListener mChannelSelectedListener = null;
    
    // The listener to notify when a channel is long clicked. 
    private OnChannelLongClickListener mChannelLongClickListener = null;

    /** Represents a listener that will be notified of channel selections. */
    public interface OnChannelSelectedListener {
        /**
         * Called when a given channel is selected.
         * @param position the position of the selected channel.
         */
        public void onChannelSelected(int position);
    }
    
    /** Represents a listener that be notified of channel long clicks. */
    public interface OnChannelLongClickListener {
      /**
       * Called when a given channel is long clicked.
       * @param position the position of the long clicked channel.
       */
      public void onChannelLongClicked(int position);
    }
  
  @Override
  public View onCreateView(LayoutInflater inflater, ViewGroup container, 
      Bundle savedInstanceState){
  
    return inflater.inflate(R.layout.fragment_channel_list, container, false);
  }
  
  @Override
  public void onActivityCreated(Bundle savedInstanceState){
    super.onActivityCreated(savedInstanceState);
    
    // Set the ListView's long click listener.
    getListView().setOnItemLongClickListener(new OnItemLongClickListener() {

      @Override
      public boolean onItemLongClick(AdapterView<?> listView, View view,
          int position, long id) {
        if (mChannelLongClickListener != null) {
          getListView().setItemChecked(position, true);
          mChannelLongClickListener.onChannelLongClicked(position);
          return true;
        }
        return false;
      }
    });
  }
  
    /** Set the listener that should be notified of channel selection events. */
    public void setChannelSelectedListener(OnChannelSelectedListener listener) {
        mChannelSelectedListener = listener;
    }
    
    /** Set the listener that should be notified of channel long click events. */
    public void setChannelLongClickListener (OnChannelLongClickListener listener) {
      mChannelLongClickListener = listener;
    }
    
  @Override
  public void onListItemClick (ListView list, View view, int position, long id){
        if (null != mChannelSelectedListener) {
          mChannelSelectedListener.onChannelSelected(position);
        }
        getListView().setItemChecked(position, true);
  }
  
  /** Get the position of checked item. */
  public int getCheckedItemPosition() {
    return getListView().getCheckedItemPosition();
  }
  
  /** Get the ID of checked item. */
  public long getCheckedItemId() {
    return getItemId(getCheckedItemPosition());
  }
  
  
  /** Set the cursor of ChannelListApdater. */
  public void setCursor(Cursor feedCursor){
    if (mAdapter == null){
      mAdapter = new ChannelListAdapter(getActivity(), feedCursor);
      mAdapter.setCursor(feedCursor);
      setListAdapter(mAdapter);
    }
    else {
      mAdapter.setCursor(feedCursor);
    }
  }
  
  public long getItemId(int position) {
    return mAdapter.getItemId(position);
  }
  
  public boolean isItemAGroup(int position) {
    return mAdapter.isItemAGroup(position);
  }
  
  /** Delete a checked item by remove the feed or feed group in the ContentProvider. Note that
   * "all_feeds" and "favorite" item will not be removed. */
  public boolean deleteCheckedItem() {
    int position = getListView().getCheckedItemPosition();
    if (position == 0 || position == 1 || position == ListView.INVALID_POSITION) {
      return false;
    }
    //getListView().setItemChecked(position, false);
    
    Cursor cursor = mAdapter.getCursor();
    cursor.moveToPosition(position - 2);
    
    int id = cursor.getInt(cursor.getColumnIndex(FeedColumns._ID));
    boolean isGroup = cursor.getInt(cursor.getColumnIndex(FeedColumns.IS_GROUP)) == 1;
    if (isGroup) {
      MainApplication.getContext().getContentResolver().delete(FeedColumns
          .GROUPS_CONTENT_URI(id), null, null);
    } else {
      MainApplication.getContext().getContentResolver().delete(FeedColumns
          .CONTENT_URI(id), null, null);
    }
    
    return true;
  }
  
  public void notifyDataSetChanged() {
    mAdapter.notifyDataSetChanged();
  }
}

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