Android Open Source - android-augment-reality-framework Wikipedia Data Source

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License

The source code is released under:

GNU General Public License

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Java Source Code

package com.jwetherell.augmented_reality.data;
//from w  w w.java2  s. c om
import java.util.ArrayList;
import java.util.List;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import android.content.res.Resources;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Color;

import com.jwetherell.augmented_reality.R;
import com.jwetherell.augmented_reality.ui.IconMarker;
import com.jwetherell.augmented_reality.ui.Marker;

/**
 * This class extends DataSource to fetch data from Wikipedia.
 * 
 * @author Justin Wetherell <phishman3579@gmail.com>
 */
public class WikipediaDataSource extends NetworkDataSource {

    private static final String BASE_URL = "http://ws.geonames.org/findNearbyWikipediaJSON";

    private static Bitmap icon = null;

    public WikipediaDataSource(Resources res) {
        if (res == null) throw new NullPointerException();

        createIcon(res);
    }

    protected void createIcon(Resources res) {
        if (res == null) throw new NullPointerException();

        icon = BitmapFactory.decodeResource(res, R.drawable.wikipedia);
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public String createRequestURL(double lat, double lon, double alt, float radius, String locale) {
        return BASE_URL + "?lat=" + lat + "&lng=" + lon + "&radius=" + radius + "&maxRows=40" + "&lang=" + locale;

    }

    /**
     * {@inheritDoc}
     */
    @Override
    public List<Marker> parse(JSONObject root) {
        if (root == null) return null;

        JSONObject jo = null;
        JSONArray dataArray = null;
        List<Marker> markers = new ArrayList<Marker>();

        try {
            if (root.has("geonames")) dataArray = root.getJSONArray("geonames");
            if (dataArray == null) return markers;
            int top = Math.min(MAX, dataArray.length());
            for (int i = 0; i < top; i++) {
                jo = dataArray.getJSONObject(i);
                Marker ma = processJSONObject(jo);
                if (ma != null) markers.add(ma);
            }
        } catch (JSONException e) {
            e.printStackTrace();
        }
        return markers;
    }

    private Marker processJSONObject(JSONObject jo) {
        if (jo == null) return null;

        Marker ma = null;
        if (jo.has("title") && jo.has("lat") && jo.has("lng") && jo.has("elevation")) {
            try {
                ma = new IconMarker(jo.getString("title"), jo.getDouble("lat"), jo.getDouble("lng"), jo.getDouble("elevation"), Color.WHITE, icon);
            } catch (JSONException e) {
                e.printStackTrace();
            }
        }
        return ma;
    }
}

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