src/org/average/whereami/LastLocation.java

   1 package org.average.whereami;
   2
   3 import org.average.whereami.CredentialStore;
   4
   5 import java.lang.Math;
   6
   7 import com.google.api.client.extensions.android2.AndroidHttp;
   8 import com.google.api.client.auth.oauth2.draft10.AccessTokenResponse;
   9 import com.google.api.client.googleapis.auth.oauth2.draft10.GoogleAccessProtectedResource;
  10 import com.google.api.client.http.HttpResponseException;
  11 import com.google.api.client.http.HttpTransport;
  12 import com.google.api.client.http.javanet.NetHttpTransport;
  13 import com.google.api.client.json.JsonFactory;
  14 import com.google.api.client.json.jackson.JacksonFactory;
  15 import com.google.api.services.latitude.Latitude;
  16 import com.google.api.services.latitude.LatitudeRequest;
  17 import com.google.api.services.latitude.model.Location;
  18
  19 import android.content.Context;
  20 import android.content.SharedPreferences;
  21 import android.content.res.Resources;
  22 import android.text.format.Time;
  23 import android.util.Log;
  24
  25 public final class LastLocation extends Oracle {
  26
  27         final String TAG = getClass().getName();
  28
  29         private Latitude latitude;
  30
  31         private String[] loc_names;
  32         private String[] loc_lats;
  33         private String[] loc_lons;
  34         private String[] loc_dists;
  35         private String myname;
  36         private String timestamp;
  37         private String longago;
  38         private String lessthanhour;
  39         private String onehour;
  40         private String hours2to4;
  41         private String hours5up;
  42
  43         public LastLocation(final Resources res, final CredentialStore store) {
  44                 loc_names = res.getStringArray(R.array.loc_names);
  45                 loc_lats = res.getStringArray(R.array.loc_lats);
  46                 loc_lons = res.getStringArray(R.array.loc_lons);
  47                 loc_dists = res.getStringArray(R.array.loc_dists);
  48                 myname = res.getString(R.string.myname);
  49                 timestamp = res.getString(R.string.timestamp);
  50                 longago = res.getString(R.string.longago);
  51                 lessthanhour = res.getString(R.string.lessthanhour);
  52                 onehour = res.getString(R.string.onehour);
  53                 hours2to4 = res.getString(R.string.hours2to4);
  54                 hours5up = res.getString(R.string.hours5up);
  55
  56                 HttpTransport transport = AndroidHttp.newCompatibleTransport();
  57                 JsonFactory jsonFactory = new JacksonFactory();
  58                 AccessTokenResponse token = store.read();
  59                 Log.v(TAG, "tokens - access: \"" + token.accessToken +
  60                         "\", refresh: \"" + token.refreshToken +
  61                         "\", client_id: \"" + ClientCredentials.CLIENT_ID +
  62                         "\", client_secret: \"" +
  63                                         ClientCredentials.CLIENT_SECRET +
  64                         "\"");
  65                 GoogleAccessProtectedResource accessProtectedResource =
  66                         new GoogleAccessProtectedResource(
  67                                 token.accessToken,
  68                                 transport, jsonFactory,
  69                                 ClientCredentials.CLIENT_ID,
  70                                 ClientCredentials.CLIENT_SECRET,
  71                                 token.refreshToken)
  72                                 {
  73                                         @Override
  74                                         public void onAccessToken(
  75                                                         String accessToken) {
  76                                                 Log.v(TAG, "Update access token to \"" + accessToken + "\"");
  77                                                 store.updateAccessToken(
  78                                                         accessToken);
  79                                         }
  80                                 }
  81                                 ;
  82                 Latitude.Builder lbldr = Latitude.builder(transport,
  83                                                                 jsonFactory);
  84                 lbldr.setHttpRequestInitializer(accessProtectedResource);
  85                 lbldr.setApplicationName("WhereAmI/1.0");
  86                 latitude = lbldr.build();
  87         }
  88
  89         @Override
  90         public final String getResult() {
  91                 try {
  92                         Log.v(TAG, "entering getResult");
  93                         Latitude.CurrentLocation.Get request =
  94                                 latitude.currentLocation().get();
  95                         request.setGranularity("best");
  96                         Location cloc = request.execute();
  97                         Double lat = Double.parseDouble(
  98                                         cloc.getLatitude().toString());
  99                         Double lon = Double.parseDouble(
 100                                         cloc.getLongitude().toString());
 101                         Long tsm = Long.parseLong(
 102                                         cloc.getTimestampMs().toString());
 103                         return locationMessage(lat, lon, tsm);
 104                 } catch (Exception ex) {
 105                         Log.v(TAG, "exception in getResult: " + ex);
 106                         ex.printStackTrace();
 107                         return ex.getMessage();
 108                 }
 109         }
 110
 111         private String locationMessage(Double lat, Double lon, Long tsm) {
 112                 Log.v(TAG, "entering locationMessage(" + lat +
 113                                 "," + lon + "," + tsm + ")");
 114                 String locmsg = "<UNSET>";
 115                 String agomsg = "<UNSET>";
 116                 for (int i = 0; i < loc_names.length; i++) {
 117                         Double dist = haversine(lat, lon,
 118                                         Double.parseDouble(loc_lats[i]),
 119                                         Double.parseDouble(loc_lons[i]));
 120                         Log.v(TAG, "Dist from " + loc_names[i] +
 121                                 " is " + dist);
 122                         if ((loc_dists[i] == "0") ||
 123                             (dist < Double.parseDouble(loc_dists[i]))) {
 124                                 locmsg = loc_names[i];
 125                                 break;
 126                         }
 127                 }
 128                 Long ago = (System.currentTimeMillis() - tsm) / 3600000;
 129                 if (ago < 1) {
 130                         agomsg = lessthanhour;
 131                 } else if (ago < 2) {
 132                         agomsg = onehour;
 133                 } else if (ago < 5) {
 134                         agomsg = "" + ago + " " + hours2to4;
 135                 } else if (ago < 24) {
 136                         agomsg = "" + ago + " " + hours5up;
 137                 } else {
 138                         agomsg = longago;
 139                 }
 140                 return myname + " " + locmsg + ", " + timestamp +
 141                         " " + agomsg;
 142         }
 143
 144         private Double toRad(Double deg) {
 145                 return deg * 3.14159265 / 180;
 146         }
 147
 148         private Double haversine(Double lat1, Double lon1,
 149                                 Double lat2, Double lon2) {
 150                 Double dlat = toRad(lat2 - lat1);
 151                 Double dlon = toRad(lon2 - lon1);
 152                 Double a = Math.sin(dlat / 2) * Math.sin(dlat / 2) +
 153                         Math.sin(dlon / 2) * Math.sin(dlon / 2) *
 154                         Math.cos(toRad(lat1)) * Math.cos(toRad(lat2));
 155                 Double c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1-a));
 156                 return 6371 * c;
 157         }
 158 }