it.gulch.linuxday.android.activities.TrackScheduleEventActivity.java Source code

Introduction

Here is the source code for it.gulch.linuxday.android.activities.TrackScheduleEventActivity.java

Source

/*
 * Copyright 2014 Christophe Beyls
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package it.gulch.linuxday.android.activities;

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.LoaderCallbacks;
import android.support.v4.content.Loader;
import android.support.v4.view.ViewPager;
import android.support.v7.app.ActionBar;
import android.support.v7.app.ActionBarActivity;
import android.util.Log;
import android.view.MenuItem;
import android.view.View;

import com.viewpagerindicator.PageIndicator;

import org.apache.commons.collections4.CollectionUtils;

import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;

import it.gulch.linuxday.android.R;
import it.gulch.linuxday.android.db.manager.EventManager;
import it.gulch.linuxday.android.db.manager.impl.DatabaseManagerFactory;
import it.gulch.linuxday.android.fragments.EventDetailsFragment;
import it.gulch.linuxday.android.loaders.TrackScheduleLoader;
import it.gulch.linuxday.android.model.db.Event;
import it.gulch.linuxday.android.model.db.Track;
import it.gulch.linuxday.android.utils.NfcUtils;

/**
 * Event view of the track schedule; allows to slide between events of the same track using a ViewPager.
 *
 * @author Christophe Beyls
 */
public class TrackScheduleEventActivity extends ActionBarActivity implements NfcUtils.CreateNfcAppDataCallback {
    public static final String EXTRA_DAY = "day";

    public static final String EXTRA_TRACK = "track";

    public static final String EXTRA_POSITION = "position";

    private static final int EVENTS_LOADER_ID = 1;

    private static final String TAG = TrackScheduleEventActivity.class.getSimpleName();

    private Track track;

    private int initialPosition = -1;

    private View progress;

    private ViewPager pager;

    private PageIndicator pageIndicator;

    private TrackScheduleEventAdapter adapter;

    private List<Event> events;

    private EventManager eventManager;

    LoaderCallbacks<List<Event>> loaderCallbacks;

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

        events = new ArrayList<>();
        setupServices();

        setContentView(R.layout.track_schedule_event);

        Bundle extras = getIntent().getExtras();
        track = (Track) extras.getSerializable(EXTRA_TRACK);

        progress = findViewById(R.id.progress);
        pager = (ViewPager) findViewById(R.id.pager);
        adapter = new TrackScheduleEventAdapter(getSupportFragmentManager());
        pageIndicator = (PageIndicator) findViewById(R.id.indicator);

        if (savedInstanceState == null) {
            initialPosition = extras.getInt(EXTRA_POSITION, -1);
            pager.setAdapter(adapter);
            pageIndicator.setViewPager(pager);
        }

        ActionBar bar = getSupportActionBar();
        bar.setDisplayHomeAsUpEnabled(true);
        bar.setTitle(R.string.event_details);
        bar.setSubtitle(track.getTitle());

        // Enable Android Beam
        NfcUtils.setAppDataPushMessageCallbackIfAvailable(this, this);

        setCustomProgressVisibility(true);

        setupLoaderCallbacks();
    }

    private void setupLoaderCallbacks() {
        loaderCallbacks = new LoaderCallbacks<List<Event>>() {
            @Override
            public Loader<List<Event>> onCreateLoader(int i, Bundle bundle) {
                return new TrackScheduleLoader(TrackScheduleEventActivity.this, eventManager, track);
            }

            @Override
            public void onLoadFinished(Loader<List<Event>> listLoader, List<Event> data) {
                setCustomProgressVisibility(false);

                if (data == null) {
                    return;
                }

                events.clear();
                events.addAll(data);
                adapter.notifyDataSetChanged();

                // Delay setting the adapter when the instance state is restored
                // to ensure the current position is restored properly
                if (pager.getAdapter() == null) {
                    pager.setAdapter(adapter);
                    pageIndicator.setViewPager(pager);
                }

                if (initialPosition != -1) {
                    pager.setCurrentItem(initialPosition, false);
                    initialPosition = -1;
                }
            }

            @Override
            public void onLoaderReset(Loader<List<Event>> listLoader) {
                events.clear();
                adapter.notifyDataSetChanged();
            }
        };

        getSupportLoaderManager().initLoader(EVENTS_LOADER_ID, null, loaderCallbacks);
    }

    private void setupServices() {
        try {
            eventManager = DatabaseManagerFactory.getEventManager(this);
        } catch (SQLException e) {
            Log.e(TAG, e.getMessage(), e);
        }
    }

    private void setCustomProgressVisibility(boolean isVisible) {
        progress.setVisibility(isVisible ? View.VISIBLE : View.GONE);
    }

    @Override
    public byte[] createNfcAppData() {
        if (adapter.getCount() == 0) {
            return null;
        }

        long eventId = adapter.getItemId(pager.getCurrentItem());
        if (eventId == -1L) {
            return null;
        }

        return String.valueOf(eventId).getBytes();
    }

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

    public class TrackScheduleEventAdapter extends FragmentStatePagerAdapter {
        public TrackScheduleEventAdapter(FragmentManager fm) {
            super(fm);
        }

        @Override
        public int getCount() {
            if (CollectionUtils.isEmpty(events)) {
                return 0;
            }

            return events.size();
        }

        @Override
        public Fragment getItem(int position) {
            if (CollectionUtils.isEmpty(events)) {
                return null;
            }

            return EventDetailsFragment.newInstance(events.get(position));
        }

        public long getItemId(int id) {
            return id;
        }
    }
}