src/org/average/whereami/LastLocation.java

   1 package org.average.whereami;
   2
   3 import org.average.whereami.PersistentStore;
   4
   5 import java.lang.Math;
   6 import java.io.IOException;
   7
   8 import com.google.api.client.googleapis.json.GoogleJsonResponseException;
   9 import com.google.api.client.http.HttpResponseException;
  10 import com.google.api.services.latitude.Latitude;
  11 import com.google.api.services.latitude.LatitudeRequest;
  12 import com.google.api.services.latitude.model.Location;
  13
  14 import android.content.Context;
  15 import android.content.res.Resources;
  16 import android.text.format.Time;
  17 import android.util.Log;
  18
  19 public final class LastLocation extends Oracle {
  20
  21         final String TAG = getClass().getName();
  22
  23         private Latitude latitude;
  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 timestamp;
  31         private String longago;
  32         private String lessthanhour;
  33         private String onehour;
  34         private String hours2to4;
  35         private String hours5up;
  36
  37         public LastLocation(final Resources res, final PersistentStore store) {
  38                 super(res, store);
  39                 loc_names = res.getStringArray(R.array.loc_names);
  40                 loc_lats = res.getStringArray(R.array.loc_lats);
  41                 loc_lons = res.getStringArray(R.array.loc_lons);
  42                 loc_dists = res.getStringArray(R.array.loc_dists);
  43                 myname = res.getString(R.string.myname);
  44                 timestamp = res.getString(R.string.timestamp);
  45                 longago = res.getString(R.string.longago);
  46                 lessthanhour = res.getString(R.string.lessthanhour);
  47                 onehour = res.getString(R.string.onehour);
  48                 hours2to4 = res.getString(R.string.hours2to4);
  49                 hours5up = res.getString(R.string.hours5up);
  50
  51                 latitude = Latitude.builder(httpTransport, jsonFactory)
  52                         .setHttpRequestInitializer(accessProtectedResource)
  53                         .setApplicationName("WhereAmI/1.0").build();
  54         }
  55
  56         @Override
  57         public final String getResult() {
  58                 try {
  59                         Log.v(TAG, "entering getResult");
  60                         Latitude.CurrentLocation.Get request =
  61                                 latitude.currentLocation().get();
  62                         request.setGranularity("best");
  63                         Location cloc = request.execute();
  64                         Double lat = Double.parseDouble(
  65                                         cloc.getLatitude().toString());
  66                         Double lon = Double.parseDouble(
  67                                         cloc.getLongitude().toString());
  68                         Long tsm = Long.parseLong(
  69                                         cloc.getTimestampMs().toString());
  70                         return locationMessage(lat, lon, tsm);
  71                 } catch (GoogleJsonResponseException e) {
  72                         Log.v(TAG, "GoogleJsonResponseException: " + e);
  73                         if (e.getResponse().getStatusCode() == 401) {
  74                                 return authErrorMessage;
  75                         } else {
  76                                 return e.getMessage();
  77                         }
  78                 } catch (HttpResponseException e) {
  79                         Log.v(TAG, "HttpResponseException: " + e);
  80                         return e.getMessage();
  81                 } catch (IOException e) {
  82                         e.printStackTrace();
  83                         return e.getMessage();
  84                 }
  85         }
  86
  87         private String locationMessage(Double lat, Double lon, Long tsm) {
  88                 Log.v(TAG, "entering locationMessage(" + lat +
  89                                 "," + lon + "," + tsm + ")");
  90                 String locmsg = "<UNSET>";
  91                 String agomsg = "<UNSET>";
  92                 for (int i = 0; i < loc_names.length; i++) {
  93                         Double dist = haversine(lat, lon,
  94                                         Double.parseDouble(loc_lats[i]),
  95                                         Double.parseDouble(loc_lons[i]));
  96                         Log.v(TAG, "Dist from " + loc_names[i] +
  97                                 " is " + dist);
  98                         if ((loc_dists[i] == "0") ||
  99                             (dist < Double.parseDouble(loc_dists[i]))) {
 100                                 locmsg = loc_names[i];
 101                                 break;
 102                         }
 103                 }
 104                 Long ago = (System.currentTimeMillis() - tsm) / 3600000;
 105                 if (ago < 1) {
 106                         agomsg = lessthanhour;
 107                 } else if (ago < 2) {
 108                         agomsg = onehour;
 109                 } else if (ago < 5) {
 110                         agomsg = "" + ago + " " + hours2to4;
 111                 } else if (ago < 24) {
 112                         agomsg = "" + ago + " " + hours5up;
 113                 } else {
 114                         agomsg = longago;
 115                 }
 116                 return myname + " " + locmsg + ", " + timestamp +
 117                         " " + agomsg;
 118         }
 119
 120         private Double toRad(Double deg) {
 121                 return deg * 3.14159265 / 180;
 122         }
 123
 124         private Double haversine(Double lat1, Double lon1,
 125                                 Double lat2, Double lon2) {
 126                 Double dlat = toRad(lat2 - lat1);
 127                 Double dlon = toRad(lon2 - lon1);
 128                 Double a = Math.sin(dlat / 2) * Math.sin(dlat / 2) +
 129                         Math.sin(dlon / 2) * Math.sin(dlon / 2) *
 130                         Math.cos(toRad(lat1)) * Math.cos(toRad(lat2));
 131                 Double c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1-a));
 132                 return 6371 * c;
 133         }
 134 }