org.m2x.rssreader.activity.RssArticleActivity.java Source code

Introduction

Here is the source code for org.m2x.rssreader.activity.RssArticleActivity.java

Source

/**
 * RssReader
 *
 * 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.activity;

import org.m2x.rssreader.MainApplication;
import org.m2x.rssreader.R;
import org.m2x.rssreader.adapter.RssArticlePagerAdapter;
import org.m2x.rssreader.provider.FeedData.EntryColumns;
import org.m2x.rssreader.util.UiUtils;

import android.content.ContentResolver;
import android.content.ContentValues;
import android.content.Intent;
import android.database.Cursor;
import android.os.Bundle;
import android.support.v4.view.ViewPager;
import android.util.Log;

import com.actionbarsherlock.app.SherlockFragmentActivity;
import com.actionbarsherlock.view.Menu;
import com.actionbarsherlock.view.MenuItem;
import com.actionbarsherlock.view.Window;

/**
 * The RSS article Activity. Shows the RSS articles.
 * @author teejoe (mtjm2x@gmail.com)
 *
 */
public class RssArticleActivity extends SherlockFragmentActivity implements ViewPager.OnPageChangeListener {

    private static final String TAG = "RssArticleActivity";

    public static final String EXTRA_ENTRY_IDS = "entry_ids";
    public static final String EXTRA_INIT_POS = "initial_pos";

    private long[] mEntryIds; // The list of RSS entry IDs.

    private ViewPager mPager; // The ViewPager to show RSS articles.

    private RssArticlePagerAdapter mAdapter; // Adapter for the ViewPager.

    private MenuItem mMenuStar; // The star menu, used to change the icon of action star.

    private int mInitPos; // The initial position of the ViewPager.

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        UiUtils.setPreferenceTheme(this);
        super.onCreate(savedInstanceState);
        requestWindowFeature(Window.FEATURE_INDETERMINATE_PROGRESS);
        setContentView(R.layout.activity_rss_article);

        setSupportProgressBarIndeterminateVisibility(true);

        getSupportActionBar().setDisplayHomeAsUpEnabled(true);

        // Get the RSS entry ids.
        mPager = (ViewPager) findViewById(R.id.pager);
        mEntryIds = getIntent().getLongArrayExtra(EXTRA_ENTRY_IDS);
        if (mEntryIds == null) {
            Log.e(TAG, "Entry id extra is null!");
        }

        // Set the adapter.
        mAdapter = new RssArticlePagerAdapter(getSupportFragmentManager(), mEntryIds);
        mPager.setAdapter(mAdapter);
        mPager.setOnPageChangeListener(this);

        // Get the initial position of pager.
        mInitPos = getIntent().getIntExtra(EXTRA_INIT_POS, -1);
        if (mInitPos != -1) {
            mPager.setCurrentItem(mInitPos);
        }
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getSupportMenuInflater().inflate(R.menu.article_activity_theme_dark, menu);

        // Set the star icon of the action bar.
        mMenuStar = menu.findItem(R.id.star);
        if (isEntryStared(mEntryIds[mInitPos])) {
            mMenuStar.setIcon(R.drawable.ic_action_important);
        } else {
            mMenuStar.setIcon(R.drawable.ic_action_not_important);
        }

        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem menuItem) {
        switch (menuItem.getItemId()) {
        case android.R.id.home:
            finish();
            break;
        case R.id.star:
            int position = mPager.getCurrentItem();
            boolean stared = isEntryStared(mEntryIds[position]);
            ContentValues values = new ContentValues();
            values.put(EntryColumns.IS_FAVORITE, !stared);
            MainApplication.getContext().getContentResolver().update(EntryColumns.CONTENT_URI(mEntryIds[position]),
                    values, null, null);
            mMenuStar.setIcon(stared ? R.drawable.ic_action_not_important : R.drawable.ic_action_important);
            break;
        case R.id.menu:
            Intent intent = new Intent(this, PreferenceActivity.class);
            startActivity(intent);
            break;
        default:
            return true;
        }

        return (super.onOptionsItemSelected(menuItem));
    }

    @Override
    public void onPageScrollStateChanged(int arg0) {
        return;
    }

    @Override
    public void onPageScrolled(int arg0, float arg1, int arg2) {
        return;
    }

    @Override
    public void onPageSelected(int position) {
        ContentResolver cr = MainApplication.getContext().getContentResolver();

        // Set the RSS entry as read.
        ContentValues value = new ContentValues();
        value.put(EntryColumns.IS_READ, true);
        cr.update(EntryColumns.CONTENT_URI(mEntryIds[position]), value, null, null);

        // Update the star icon.
        if (mMenuStar != null) { // mMenuStar could be null when OptionsMenu has not created yet.
            if (isEntryStared(mEntryIds[position])) {
                mMenuStar.setIcon(R.drawable.ic_action_important);
            } else {
                mMenuStar.setIcon(R.drawable.ic_action_not_important);
            }
        }

    }

    /** Tell if the entry is stared by its ID. */
    private boolean isEntryStared(long entryId) {
        ContentResolver cr = MainApplication.getContext().getContentResolver();
        Cursor cursor = cr.query(EntryColumns.CONTENT_URI(entryId), new String[] { EntryColumns.IS_FAVORITE }, null,
                null, null);

        if (cursor.moveToFirst() && cursor.getInt(cursor.getColumnIndex(EntryColumns.IS_FAVORITE)) == 1) {
            cursor.close();
            return true;
        }

        return false;
    }
}