cz.tomas.StockAnalyze.activity.NewsActivity.java Source code

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Here is the source code for cz.tomas.StockAnalyze.activity.NewsActivity.java

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/*******************************************************************************
 * StockAnalyze for Android
 *     Copyright (C)  2011 Tomas Vondracek.
 * 
 *     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 cz.tomas.StockAnalyze.activity;

import android.content.Intent;
import android.database.Cursor;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.SystemClock;
import android.support.v4.app.LoaderManager.LoaderCallbacks;
import android.support.v4.content.CursorLoader;
import android.support.v4.content.Loader;
import android.util.Log;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ListView;
import com.actionbarsherlock.view.Menu;
import com.actionbarsherlock.view.MenuInflater;
import com.actionbarsherlock.view.MenuItem;
import com.handmark.pulltorefresh.library.PullToRefreshBase.OnRefreshListener;
import com.handmark.pulltorefresh.library.PullToRefreshListView;
import cz.tomas.StockAnalyze.Application;
import cz.tomas.StockAnalyze.News.NewsContentProvider;
import cz.tomas.StockAnalyze.News.NewsListAdapter;
import cz.tomas.StockAnalyze.News.NewsSqlHelper;
import cz.tomas.StockAnalyze.News.Rss;
import cz.tomas.StockAnalyze.R;
import cz.tomas.StockAnalyze.activity.base.BaseFragmentActivity;
import cz.tomas.StockAnalyze.utils.NavUtils;
import cz.tomas.StockAnalyze.utils.Utils;

/**
 * Activity with list of titles of all articles together with description.
 * @author tomas
 *
 */
public class NewsActivity extends BaseFragmentActivity implements LoaderCallbacks<Cursor> {

    public static final String EXTRA_NEWS_POSITION = "news-position";
    private static final long UPDATE_INTERVAL = 60 * 1000;

    private NewsListAdapter adapter;
    private PullToRefreshListView listView;
    private static long lastUpdateTime = 0;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        this.setContentView(R.layout.news_layout);

        this.listView = (PullToRefreshListView) this.findViewById(R.id.listView);
        listView.setOnRefreshListener(new OnRefreshListener() {

            @Override
            public void onRefresh() {
                refresh();
            }
        });
        final ListView refreshableView = listView.getRefreshableView();
        refreshableView.setTextFilterEnabled(true);
        refreshableView.setOnItemClickListener(new OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long rowId) {
                Intent intent = new Intent(NewsActivity.this, NewsDetailActivity.class);
                intent.putExtra(EXTRA_NEWS_POSITION, position - refreshableView.getHeaderViewsCount());
                startActivity(intent);
            }
        });

        this.adapter = new NewsListAdapter(this, null);
        refreshableView.setAdapter(this.adapter);

        this.getSupportLoaderManager().initLoader(0, null, this);
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        final MenuInflater inflater = getSupportMenuInflater();
        inflater.inflate(R.menu.news_menu, menu);

        return super.onCreateOptionsMenu(menu);
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle item selection
        switch (item.getItemId()) {
        case R.id.menu_refresh:
            refresh();
            return true;
        case R.id.menu_settings:
            NavUtils.goToSettings(this);
            return true;
        default:
            return super.onOptionsItemSelected(item);
        }
    }

    protected void refresh() {
        NewsRefreshTask task = new NewsRefreshTask();
        task.execute();
    }

    @Override
    protected void onNavigateUp() {
        NavUtils.goUp(this, HomeActivity.class);
    }

    @Override
    public Loader<Cursor> onCreateLoader(int id, Bundle args) {
        return new CursorLoader(this, NewsContentProvider.ARTICLES_CONTENT_URI,
                NewsSqlHelper.ArticleColumns.BASE_PROJECTION, null, null, null);
    }

    @Override
    public void onLoadFinished(Loader<Cursor> loader, Cursor data) {
        this.adapter.swapCursor(data);

        //      this.getActionBar().setRefreshActionItemState(false);
        this.listView.onRefreshComplete();
        final long current = SystemClock.elapsedRealtime();
        if (current - lastUpdateTime > UPDATE_INTERVAL) {
            this.refresh();
            lastUpdateTime = current;
        }
    }

    @Override
    public void onLoaderReset(Loader<Cursor> loader) {
        this.adapter.swapCursor(null);
    }

    private class NewsRefreshTask extends AsyncTask<Void, Integer, Boolean> {

        @Override
        protected void onPreExecute() {
            super.onPreExecute();

            //         getActionBarHelper().setRefreshActionItemState(true);
        }

        @Override
        protected Boolean doInBackground(Void... params) {
            Rss rss = (Rss) getApplicationContext().getSystemService(Application.RSS_SERVICE);
            try {
                rss.fetchArticles();
            } catch (Exception e) {
                Log.e(Utils.LOG_TAG, "failed to refresh news", e);
                return false;
            }
            return true;
        }

        @Override
        protected void onPostExecute(Boolean result) {
            if (result == null || !result) {
                // error
                //            getActionBarHelper().setRefreshActionItemState(false);
                listView.onRefreshComplete();
            }
        }
    }
}