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

Introduction

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

Source

/*
 * 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.app.Activity;
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.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.ViewGroup.LayoutParams;
import android.webkit.WebView;
import edu.stanford.mobisocial.dungbeetle.feed.objects.LocationObj;
import edu.stanford.mobisocial.dungbeetle.model.DbObject;

public class FeedMapFragment extends Fragment {

    public static final String ARG_FEED_URI = "feed_uri";
    LayoutParams LAYOUT_FULL_WIDTH = new LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.WRAP_CONTENT);

    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);

        ContentResolver resolver = getActivity().getContentResolver();
        resolver.registerContentObserver(mFeedUri, true, mFeedObserver);

        View view = new WebView(getActivity());
        view.setLayoutParams(LAYOUT_FULL_WIDTH);
        view.setId(android.R.id.custom);
        return view;
    }

    @Override
    public void onAttach(Activity activity) {
        super.onAttach(activity);
        mFeedObserver = new ContentObserver(new Handler(activity.getMainLooper())) {
            @Override
            public void onChange(boolean selfChange) {
                onFeedUpdated();
            }
        };
        mFeedUri = getArguments().getParcelable(ARG_FEED_URI);
    }

    @Override
    public void onActivityCreated(Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);
        onFeedUpdated();
    }

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

    private void onFeedUpdated() {
        StringBuilder pathBuilder = new StringBuilder();
        pathBuilder.append("http://maps.googleapis.com/maps/api/staticmap?size=512x512&sensor=true&path=");
        pathBuilder.append("color:0x0000ff|weight:5");

        Cursor c = getActivity().getContentResolver().query(mFeedUri, null, getLocationClause(), null,
                DbObject._ID + " DESC");
        try {
            int totalSize = c.getCount();
            c.moveToFirst();
            // TODO: This graphs all points in a path.
            // You probably want unique paths for each user.
            for (int i = 1; i < totalSize; i++) {
                c.moveToNext();
                DbObject obj = DbObject.fromCursor(c);
                String lat = obj.getJson().optString(LocationObj.COORD_LAT);
                String lon = obj.getJson().optString(LocationObj.COORD_LONG);
                pathBuilder.append("|").append(lat).append(",").append(lon);
            }
        } finally {
            c.close();
        }
        Uri data = Uri.parse(pathBuilder.toString());
        ((WebView) getActivity().findViewById(android.R.id.custom)).loadUrl(data.toString());
    }

    private String getLocationClause() {
        return DbObject.TYPE + " = '" + LocationObj.TYPE + "'";
    }
}