Android Open Source - android-augment-reality-framework Google Places 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  ww  .j  av  a 2 s. c  o  m
import java.io.InputStream;
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 Google Places.
 * 
 * @author Justin Wetherell <phishman3579@gmail.com>
 */
public class GooglePlacesDataSource extends NetworkDataSource {

  private static final String URL = "https://maps.googleapis.com/maps/api/place/search/json?";
  private static final String TYPES = "airport|amusement_park|aquarium|art_gallery|bus_station|campground|car_rental|city_hall|embassy|establishment|hindu_temple|local_governemnt_office|mosque|museum|night_club|park|place_of_worship|police|post_office|stadium|spa|subway_station|synagogue|taxi_stand|train_station|travel_agency|University|zoo";

  private static String key = null;
  private static Bitmap icon = null;

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

    key = res.getString(R.string.google_places_api_key);

    createIcon(res);
  }

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

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

  @Override
  public String createRequestURL(double lat, double lon, double alt, float radius, String locale) {
    try {
      return URL + "location="+lat+","+lon+"&radius="+(radius*1000.0f)+"&types="+TYPES+"&sensor=true&key="+key;
    } catch (Exception e) {
      e.printStackTrace();
      return null;
    }
  }

  /**
   * {@inheritDoc}
   */

  @Override
  public List<Marker> parse(String URL) {
    if (URL == null) throw new NullPointerException();

    InputStream stream = null;
    stream = getHttpGETInputStream(URL);
    if (stream == null) throw new NullPointerException();

    String string = null;
    string = getHttpInputString(stream);
    if (string == null) throw new NullPointerException();

    JSONObject json = null;
    try {
      json = new JSONObject(string);
    } catch (JSONException e) {
      e.printStackTrace();
    }
    if (json == null) throw new NullPointerException();

    return parse(json);
  }

  @Override
  public List<Marker> parse(JSONObject root) {
    if (root == null) throw new NullPointerException();

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

    try {
      if (root.has("results")) dataArray = root.getJSONArray("results");
      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) throw new NullPointerException();

    if (!jo.has("geometry")) throw new NullPointerException();

    Marker ma = null;
    try {
      Double lat = null, lon = null;

      if (!jo.isNull("geometry")) {
        JSONObject geo = jo.getJSONObject("geometry");
        JSONObject coordinates = geo.getJSONObject("location");
        lat = Double.parseDouble(coordinates.getString("lat"));
        lon = Double.parseDouble(coordinates.getString("lng"));
      }
      if (lat != null) {
        String user = jo.getString("name");

        ma = new IconMarker(user + ": " + jo.getString("name"), lat, lon, 0, Color.RED, icon);
      }
    } catch (Exception e) {
      e.printStackTrace();
    }
    return ma;
  }
}

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