src/org/average/whereami/LastLocation.java

   1 package org.average.whereami;
   2
   3 import org.average.whereami.APIBase;
   4 import org.average.whereami.PersistentStore;
   5 import org.average.whereami.SayWhen;
   6
   7 import java.lang.Math;
   8 import java.io.IOException;
   9
  10 import com.google.api.client.googleapis.json.GoogleJsonResponseException;
  11 import com.google.api.client.http.HttpResponseException;
  12 import com.google.api.services.latitude.Latitude;
  13 import com.google.api.services.latitude.LatitudeRequest;
  14 import com.google.api.services.latitude.model.Location;
  15
  16 import android.content.Context;
  17 import android.content.res.Resources;
  18 import android.text.format.Time;
  19 import android.util.Log;
  20
  21 public final class LastLocation extends Oracle {
  22
  23         final String TAG = getClass().getName();
  24
  25         private String[] loc_names;
  26         private String[] loc_lats;
  27         private String[] loc_lons;
  28         private String[] loc_dists;
  29         private String myname;
  30         private String registered;
  31         private SayWhen sayWhen;
  32         private Latitude latitude;
  33
  34         public LastLocation(APIBase base) {
  35                 super(base);
  36                 loc_names = base.res.getStringArray(R.array.loc_names);
  37                 loc_lats = base.res.getStringArray(R.array.loc_lats);
  38                 loc_lons = base.res.getStringArray(R.array.loc_lons);
  39                 loc_dists = base.res.getStringArray(R.array.loc_dists);
  40                 myname = base.res.getString(R.string.myname);
  41                 registered = base.res.getString(R.string.registered);
  42                 sayWhen = new SayWhen(base.res);
  43                 latitude = Latitude.builder(base.httpTransport,
  44                                                         base.jsonFactory)
  45                         .setHttpRequestInitializer(
  46                                                 base.accessProtectedResource)
  47                         .setApplicationName("WhereAmI/1.0").build();
  48         }
  49
  50         @Override
  51         public final String getResult() {
  52                 try {
  53                         Log.v(TAG, "entering getResult");
  54                         Latitude.CurrentLocation.Get request =
  55                                 latitude.currentLocation().get();
  56                         request.setGranularity("best");
  57                         Location cloc = request.execute();
  58                         Double lat = Double.parseDouble(
  59                                         cloc.getLatitude().toString());
  60                         Double lon = Double.parseDouble(
  61                                         cloc.getLongitude().toString());
  62                         Long tsm = Long.parseLong(
  63                                         cloc.getTimestampMs().toString());
  64                         return locationMessage(lat, lon, tsm);
  65                 } catch (GoogleJsonResponseException e) {
  66                         Log.e(TAG, "GoogleJsonResponseException: " + e);
  67                         if (e.getResponse().getStatusCode() == 401) {
  68                                 return base.authErrorMessage;
  69                         } else {
  70                                 return e.getMessage();
  71                         }
  72                 } catch (HttpResponseException e) {
  73                         Log.e(TAG, "HttpResponseException: " + e);
  74                         return e.getMessage();
  75                 } catch (IOException e) {
  76                         e.printStackTrace();
  77                         return e.getMessage();
  78                 }
  79         }
  80
  81         private String locationMessage(Double lat, Double lon, Long tsm) {
  82                 Log.v(TAG, "entering locationMessage(" + lat +
  83                                 "," + lon + "," + tsm + ")");
  84                 String locmsg = "<UNSET>";
  85                 String agomsg = "<UNSET>";
  86                 for (int i = 0; i < loc_names.length; i++) {
  87                         Double dist = haversine(lat, lon,
  88                                         Double.parseDouble(loc_lats[i]),
  89                                         Double.parseDouble(loc_lons[i]));
  90                         Log.v(TAG, "Dist from " + loc_names[i] +
  91                                 " is " + dist);
  92                         if ((loc_dists[i] == "0") ||
  93                             (dist < Double.parseDouble(loc_dists[i]))) {
  94                                 locmsg = loc_names[i];
  95                                 break;
  96                         }
  97                 }
  98                 return myname + " " + locmsg + ", " + registered +
  99                         " " + sayWhen.say(tsm);
 100         }
 101
 102         private Double toRad(Double deg) {
 103                 return deg * 3.14159265 / 180;
 104         }
 105
 106         private Double haversine(Double lat1, Double lon1,
 107                                 Double lat2, Double lon2) {
 108                 Double dlat = toRad(lat2 - lat1);
 109                 Double dlon = toRad(lon2 - lon1);
 110                 Double a = Math.sin(dlat / 2) * Math.sin(dlat / 2) +
 111                         Math.sin(dlon / 2) * Math.sin(dlon / 2) *
 112                         Math.cos(toRad(lat1)) * Math.cos(toRad(lat2));
 113                 Double c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1-a));
 114                 return 6371 * c;
 115         }
 116 }