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      1 package com.android.contacts.common.location;
      2 
      3 import android.app.IntentService;
      4 import android.content.Context;
      5 import android.content.Intent;
      6 import android.content.SharedPreferences;
      7 import android.content.SharedPreferences.Editor;
      8 import android.location.Address;
      9 import android.location.Geocoder;
     10 import android.location.Location;
     11 import android.preference.PreferenceManager;
     12 import android.util.Log;
     13 
     14 import java.io.IOException;
     15 import java.util.List;
     16 
     17 /**
     18  * Service used to perform asynchronous geocoding from within a broadcast receiver. Given a
     19  * {@link Location}, convert it into a country code, and save it in shared preferences.
     20  */
     21 public class UpdateCountryService extends IntentService {
     22     private static final String TAG = UpdateCountryService.class.getSimpleName();
     23 
     24     private static final String ACTION_UPDATE_COUNTRY = "saveCountry";
     25 
     26     private static final String KEY_INTENT_LOCATION = "location";
     27 
     28     public UpdateCountryService() {
     29         super(TAG);
     30     }
     31 
     32     public static void updateCountry(Context context, Location location) {
     33         final Intent serviceIntent = new Intent(context, UpdateCountryService.class);
     34         serviceIntent.setAction(ACTION_UPDATE_COUNTRY);
     35         serviceIntent.putExtra(UpdateCountryService.KEY_INTENT_LOCATION, location);
     36         context.startService(serviceIntent);
     37     }
     38 
     39     @Override
     40     protected void onHandleIntent(Intent intent) {
     41         if (intent == null) {
     42             Log.d(TAG, "onHandleIntent: could not handle null intent");
     43             return;
     44         }
     45         if (ACTION_UPDATE_COUNTRY.equals(intent.getAction())) {
     46             final Location location = (Location) intent.getParcelableExtra(KEY_INTENT_LOCATION);
     47             final String country = getCountryFromLocation(getApplicationContext(), location);
     48 
     49             if (country == null) {
     50                 return;
     51             }
     52 
     53             final SharedPreferences prefs =
     54                     PreferenceManager.getDefaultSharedPreferences(getApplicationContext());
     55 
     56             final Editor editor = prefs.edit();
     57             editor.putLong(CountryDetector.KEY_PREFERENCE_TIME_UPDATED,
     58                     System.currentTimeMillis());
     59             editor.putString(CountryDetector.KEY_PREFERENCE_CURRENT_COUNTRY, country);
     60             editor.commit();
     61         }
     62     }
     63 
     64     /**
     65      * Given a {@link Location}, return a country code.
     66      *
     67      * @return the ISO 3166-1 two letter country code
     68      */
     69     private String getCountryFromLocation(Context context, Location location) {
     70         final Geocoder geocoder = new Geocoder(context);
     71         String country = null;
     72         try {
     73             final List<Address> addresses = geocoder.getFromLocation(
     74                     location.getLatitude(), location.getLongitude(), 1);
     75             if (addresses != null && addresses.size() > 0) {
     76                 country = addresses.get(0).getCountryCode();
     77             }
     78         } catch (IOException e) {
     79             Log.w(TAG, "Exception occurred when getting geocoded country from location");
     80         }
     81         return country;
     82     }
     83 }
     84