Android Open Source - RssReader Rss Article Fragment

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License

The source code is released under:

GNU General Public License

Java Source Code

/**
 * RssReader//from w w  w .jav  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.lang.ref.WeakReference;

import android.content.ActivityNotFoundException;
import android.content.Intent;
import android.database.Cursor;
import android.net.Uri;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Toast;

import com.actionbarsherlock.app.SherlockFragment;
import com.actionbarsherlock.app.SherlockFragmentActivity;

import org.m2x.rssreader.MainApplication;
import org.m2x.rssreader.R;
import org.m2x.rssreader.provider.FeedData.EntryColumns;
import org.m2x.rssreader.view.RssArticleView;

/**
 * The fragment to show a RSS article.
 * @author teejoe (mtjm2x@gmail.com)
 *
 */
public class RssArticleFragment extends SherlockFragment implements
    RssArticleView.OnActionListener {
  
  private static final String EXTRA_ENTRY_ID = "extra_entry_id";
  
  private static final int MESSAGE_LOAD_BEGIN = 0x0001;
  private static final int MESSAGE_LOAD_FINISH = 0x0002;
  
  private long mEntryId;
  
  private Cursor mCursor;
  
  private RssArticleView mRssArticleView;
      
  /** Handler to update progress bar state. */
  static class ProgressBarHandler extends Handler {
    WeakReference<SherlockFragmentActivity> mActivityRef = null;
    
    ProgressBarHandler(SherlockFragmentActivity activity) {
      mActivityRef = new WeakReference<SherlockFragmentActivity>(activity);
    }
    
    public void handlerMessage(Message msg) {
        if (msg.what == MESSAGE_LOAD_BEGIN) {
          SherlockFragmentActivity activity = mActivityRef.get();
          if (activity != null) {
            activity.setSupportProgressBarIndeterminateVisibility(true);
          }
        } else if (msg.what == MESSAGE_LOAD_FINISH) {
          SherlockFragmentActivity activity = mActivityRef.get();
          if (activity != null) {
            activity.setSupportProgressBarIndeterminateVisibility(false);
          }
        }
    }
  };
  
  public static RssArticleFragment newInstance(long feedId) {
      final RssArticleFragment fragment = new RssArticleFragment();
    
      final Bundle args = new Bundle();
      args.putLong(EXTRA_ENTRY_ID, feedId);
      fragment.setArguments(args);
  
      return fragment;
  }
  
  public RssArticleFragment() {}
  
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        mEntryId = getArguments() != null ? getArguments().getLong(EXTRA_ENTRY_ID) : null;
    }
    
    @Override
    public void onResume() {
      super.onResume();
    }
  
  @Override
  public View onCreateView(LayoutInflater inflater, ViewGroup container, 
      Bundle savedInstanceState){
    View rootView = inflater.inflate(R.layout.fragment_rss_article, container, false);
        
    mRssArticleView = (RssArticleView) rootView.findViewById(R.id.article_view);
    mRssArticleView.setListener(this);
    
    return rootView;
  }
  
  @Override
  public void onActivityCreated(Bundle savedInstanceState){
    super.onActivityCreated(savedInstanceState);
  
    beginLoadData();
  }

  private void beginLoadData() {
    new LoadArticleTask().execute(mEntryId);
  }
  
  /** Load the RSS feed information by a given feed ID. */
  class LoadArticleTask extends AsyncTask<Long, Integer, Cursor> {
    
    @Override
    protected Cursor doInBackground(Long... params) {
      mCursor = MainApplication.getContext().getContentResolver().query(
            EntryColumns.CONTENT_URI(params[0]), null, null, null, null);
      
      return mCursor;
    }    
    
    @Override
    protected void onPostExecute(Cursor cursor){
      if (cursor.moveToFirst()) {
        String title = cursor.getString(cursor.getColumnIndex(EntryColumns.TITLE));
        String link = cursor.getString(cursor.getColumnIndex(EntryColumns.LINK));
        long timestamp = cursor.getLong(cursor.getColumnIndex(EntryColumns.DATE));
        String author = cursor.getString(cursor.getColumnIndex(EntryColumns.AUTHOR));
        String content = cursor.getString(cursor.getColumnIndex(EntryColumns.ABSTRACT));
      
        mRssArticleView.setHtml(mEntryId, title, link, content, author, 
            timestamp, false);  
        
        setProgressBarVisibility(false);
      }
    }
  }
  
  /** Set the visibility of ProgressBar on the ActionBar. */
  private void setProgressBarVisibility(boolean visible) {
    SherlockFragmentActivity activity = (SherlockFragmentActivity)getActivity();
    if (activity == null) {
      return;
    } else {
      activity.setSupportProgressBarIndeterminateVisibility(visible);
    }
  }

  @Override
  public void onClickComment() {
    if (mCursor == null || !mCursor.moveToFirst()) {
      return;
    }
    
    String commentsLink = mCursor.getString(mCursor.getColumnIndex(EntryColumns.COMMENTS));
    if (commentsLink == null || commentsLink.equals("")) {
      Toast.makeText(MainApplication.getContext(), MainApplication.getContext()
          .getResources().getString(R.string.no_comments_link), Toast.LENGTH_SHORT)
          .show();
    } else {
      try {
        Intent browserIntent = new Intent(Intent.ACTION_VIEW, Uri.parse(commentsLink));
        startActivity(browserIntent);  
      } catch (ActivityNotFoundException e) {
        Toast.makeText(MainApplication.getContext(), MainApplication.getContext()
            .getResources().getString(R.string.open_comments_fail), Toast.LENGTH_SHORT)
            .show();
        e.printStackTrace();
      }
    };
  }
}

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