org.jamienicol.episodes.EpisodeActivity.java Source code

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Here is the source code for org.jamienicol.episodes.EpisodeActivity.java

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/*
 * Copyright (C) 2012-2015 Jamie Nicol <jamie@thenicols.net>
 *
 * 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.jamienicol.episodes;

import android.content.Intent;
import android.database.Cursor;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentStatePagerAdapter;
import android.support.v4.app.LoaderManager;
import android.support.v4.content.CursorLoader;
import android.support.v4.content.Loader;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AppCompatActivity;
import android.view.MenuItem;
import org.jamienicol.episodes.db.EpisodesTable;
import org.jamienicol.episodes.db.ShowsProvider;

public class EpisodeActivity extends AppCompatActivity implements LoaderManager.LoaderCallbacks<Cursor> {
    int initialEpisodeId;
    private ViewPager episodeDetailsPager;
    private Cursor episodesData;
    private EpisodeDetailsPagerAdapter pagerAdapter;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.episode_activity);

        getSupportActionBar().setDisplayHomeAsUpEnabled(true);

        Intent intent = getIntent();
        int showId = intent.getIntExtra("showId", -1);
        if (showId == -1) {
            throw new IllegalArgumentException("must provide valid showId");
        }
        int seasonNumber = intent.getIntExtra("seasonNumber", -1);
        if (seasonNumber == -1) {
            throw new IllegalArgumentException("must provide valid seasonNumber");
        }
        initialEpisodeId = intent.getIntExtra("initialEpisodeId", -1);
        if (initialEpisodeId == -1) {
            throw new IllegalArgumentException("must provide valid initialEpisodeId");
        }

        episodeDetailsPager = (ViewPager) findViewById(R.id.episode_details_pager);
        episodesData = null;
        pagerAdapter = new EpisodeDetailsPagerAdapter(getSupportFragmentManager(), episodesData);
        episodeDetailsPager.setAdapter(pagerAdapter);

        Bundle loaderArgs = new Bundle();
        loaderArgs.putInt("showId", showId);
        loaderArgs.putInt("seasonNumber", seasonNumber);
        getSupportLoaderManager().initLoader(0, loaderArgs, this);
    }

    @Override
    public Loader<Cursor> onCreateLoader(int id, Bundle args) {
        int showId = args.getInt("showId");
        int seasonNumber = args.getInt("seasonNumber");

        String[] projection = { EpisodesTable.COLUMN_ID };
        String selection = String.format("%s=? AND %s=?", EpisodesTable.COLUMN_SHOW_ID,
                EpisodesTable.COLUMN_SEASON_NUMBER);
        String[] selectionArgs = { String.valueOf(showId), String.valueOf(seasonNumber) };

        return new CursorLoader(this, ShowsProvider.CONTENT_URI_EPISODES, projection, selection, selectionArgs,
                EpisodesTable.COLUMN_EPISODE_NUMBER + " ASC");
    }

    private int getEpisodePositionFromId(Cursor episodesData, int id) {
        int position;

        episodesData.moveToPosition(-1);
        while (episodesData.moveToNext()) {
            int idColumnIndex = episodesData.getColumnIndexOrThrow(EpisodesTable.COLUMN_ID);

            if (id == episodesData.getInt(idColumnIndex)) {
                return episodesData.getPosition();
            }
        }

        return 0;
    }

    @Override
    public void onLoadFinished(Loader<Cursor> loader, Cursor data) {

        /* we'll need to move the view pager to the initial episode
           if this is the first time data has been loaded */
        final boolean moveToInitialPosition = (data != null) && (episodesData == null);

        episodesData = data;
        pagerAdapter.swapCursor(episodesData);

        if (moveToInitialPosition) {
            int initialPosition = getEpisodePositionFromId(episodesData, initialEpisodeId);
            episodeDetailsPager.setCurrentItem(initialPosition, false);
        }
    }

    @Override
    public void onLoaderReset(Loader<Cursor> loader) {
        onLoadFinished(loader, null);
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {
        case android.R.id.home:
            finish();
            return true;

        default:
            return super.onOptionsItemSelected(item);
        }
    }

    private static class EpisodeDetailsPagerAdapter extends FragmentStatePagerAdapter {
        Cursor episodesData;

        public EpisodeDetailsPagerAdapter(FragmentManager fragmentManager, Cursor episodesData) {
            super(fragmentManager);

            swapCursor(episodesData);
        }

        public void swapCursor(Cursor episodesData) {
            this.episodesData = episodesData;
            this.notifyDataSetChanged();
        }

        @Override
        public int getCount() {
            if (episodesData != null) {
                return episodesData.getCount();
            } else {
                return 0;
            }
        }

        @Override
        public Fragment getItem(int position) {
            int idColumnIndex = episodesData.getColumnIndexOrThrow(EpisodesTable.COLUMN_ID);
            episodesData.moveToPosition(position);
            int episodeId = episodesData.getInt(idColumnIndex);
            return EpisodeDetailsFragment.newInstance(episodeId);
        }
    }
}