edu.stanford.mobisocial.dungbeetle.ui.fragments.FeedSlideshowFragment.java Source code

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Here is the source code for edu.stanford.mobisocial.dungbeetle.ui.fragments.FeedSlideshowFragment.java

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/*
 * Copyright (C) 2011 The Stanford MobiSocial Laboratory
 *
 * This file is part of Musubi, a mobile social network.
 *
 *  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 2
 * 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, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */

package edu.stanford.mobisocial.dungbeetle.ui.fragments;

import android.content.ContentResolver;
import android.database.ContentObserver;
import android.database.Cursor;
import android.net.Uri;
import android.os.Bundle;
import android.os.Handler;
import android.support.v4.app.Fragment;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import edu.stanford.mobisocial.dungbeetle.R;
import edu.stanford.mobisocial.dungbeetle.feed.DbObjects;
import edu.stanford.mobisocial.dungbeetle.model.DbObject;
import edu.stanford.mobisocial.dungbeetle.util.CommonLayouts;

public class FeedSlideshowFragment extends Fragment {

    public static final String ARG_FEED_URI = "feed_uri";

    public static final String TAG = "ObjectsActivity";
    private ContentObserver mFeedObserver;
    private Uri mFeedUri;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        View tabs = getActivity().findViewById(R.id.tab_frame);
        if (tabs != null) {
            tabs.setVisibility(View.GONE);
        }
        View view = inflater.inflate(R.layout.objects_item, container, false);
        view.setLayoutParams(CommonLayouts.FULL_WIDTH);
        view.setId(R.id.feed_view);
        return view;
    }

    @Override
    public void onActivityCreated(Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);
        mFeedObserver = new ContentObserver(new Handler(getActivity().getMainLooper())) {
            @Override
            public void onChange(boolean selfChange) {
                // TODO, queue to end of list if we don't requery
            }
        };
        mFeedUri = getArguments().getParcelable(ARG_FEED_URI);
        ContentResolver resolver = getActivity().getContentResolver();
        resolver.registerContentObserver(mFeedUri, true, mFeedObserver);
        startSlideshow();
    }

    @Override
    public void onDestroyView() {
        super.onDestroyView();
        getActivity().getContentResolver().unregisterContentObserver(mFeedObserver);
    }

    public static String getFeedObjectClause() {
        String[] types = DbObjects.getRenderableTypes();
        StringBuffer allowed = new StringBuffer();
        for (String type : types) {
            allowed.append(",'").append(type).append("'");
        }
        return DbObject.TYPE + " in (" + allowed.substring(1) + ")";
    }

    private void startSlideshow() {
        Cursor c = getActivity().getContentResolver().query(mFeedUri, null, getFeedObjectClause(), null,
                DbObject._ID + " ASC");
        try {
            if (!c.moveToFirst()) {
                Log.d(TAG, "No items to display.");
                return;
            }

            while (!c.isLast()) {
                View v = getActivity().findViewById(R.id.feed_view);
                DbObject.bindView(v, getActivity(), c, false);

                // TODO: background thread that wakes up and updates foreground activity.
                try {
                    Thread.sleep(3000); // TODO: diff timestamps; beware of sync death!
                } catch (InterruptedException e) {
                }
            }
        } finally {
            c.close();
        }
    }
}