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      1 /*
      2  * Copyright (C) 2016 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package com.android.tv.util;
     18 
     19 import android.Manifest;
     20 import android.content.Context;
     21 import android.content.pm.PackageManager;
     22 import android.location.Address;
     23 import android.location.Geocoder;
     24 import android.location.Location;
     25 import android.location.LocationListener;
     26 import android.location.LocationManager;
     27 import android.os.Bundle;
     28 import android.support.annotation.NonNull;
     29 import android.text.TextUtils;
     30 import android.util.Log;
     31 
     32 import com.android.tv.tuner.util.PostalCodeUtils;
     33 
     34 import java.io.IOException;
     35 import java.util.List;
     36 import java.util.Locale;
     37 
     38 /**
     39  * A utility class to get the current location.
     40  */
     41 public class LocationUtils {
     42     private static final String TAG = "LocationUtils";
     43     private static final boolean DEBUG = false;
     44 
     45     private static Context sApplicationContext;
     46     private static Address sAddress;
     47     private static String sCountry;
     48     private static IOException sError;
     49 
     50     /**
     51      * Checks the current location.
     52      */
     53     public static synchronized Address getCurrentAddress(Context context) throws IOException,
     54             SecurityException {
     55         if (sAddress != null) {
     56             return sAddress;
     57         }
     58         if (sError != null) {
     59             throw sError;
     60         }
     61         if (sApplicationContext == null) {
     62             sApplicationContext = context.getApplicationContext();
     63         }
     64         LocationUtilsHelper.startLocationUpdates();
     65         return null;
     66     }
     67 
     68     /** Returns the current country. */
     69     @NonNull
     70     public static synchronized String getCurrentCountry(Context context) {
     71         if (sCountry != null) {
     72             return sCountry;
     73         }
     74         if (TextUtils.isEmpty(sCountry)) {
     75             sCountry = context.getResources().getConfiguration().locale.getCountry();
     76         }
     77         return sCountry;
     78     }
     79 
     80     private static void updateAddress(Location location) {
     81         if (DEBUG) Log.d(TAG, "Updating address with " + location);
     82         if (location == null) {
     83             return;
     84         }
     85         Geocoder geocoder = new Geocoder(sApplicationContext, Locale.getDefault());
     86         try {
     87             List<Address> addresses = geocoder.getFromLocation(
     88                     location.getLatitude(), location.getLongitude(), 1);
     89             if (addresses != null && !addresses.isEmpty()) {
     90                 sAddress = addresses.get(0);
     91                 if (DEBUG) Log.d(TAG, "Got " + sAddress);
     92                 try {
     93                     PostalCodeUtils.updatePostalCode(sApplicationContext);
     94                 } catch (Exception e) {
     95                     // Do nothing
     96                 }
     97             } else {
     98                 if (DEBUG) Log.d(TAG, "No address returned");
     99             }
    100             sError = null;
    101         } catch (IOException e) {
    102             Log.w(TAG, "Error in updating address", e);
    103             sError = e;
    104         }
    105     }
    106 
    107     private LocationUtils() { }
    108 
    109     private static class LocationUtilsHelper {
    110         private static final LocationListener LOCATION_LISTENER = new LocationListener() {
    111             @Override
    112             public void onLocationChanged(Location location) {
    113                 updateAddress(location);
    114             }
    115 
    116             @Override
    117             public void onStatusChanged(String provider, int status, Bundle extras) { }
    118 
    119             @Override
    120             public void onProviderEnabled(String provider) { }
    121 
    122             @Override
    123             public void onProviderDisabled(String provider) { }
    124         };
    125 
    126         private static LocationManager sLocationManager;
    127 
    128         public static void startLocationUpdates() {
    129             if (sLocationManager == null) {
    130                 sLocationManager = (LocationManager) sApplicationContext.getSystemService(
    131                         Context.LOCATION_SERVICE);
    132                 try {
    133                     sLocationManager.requestLocationUpdates(
    134                             LocationManager.NETWORK_PROVIDER, 1000, 10, LOCATION_LISTENER, null);
    135                 } catch (SecurityException e) {
    136                     // Enables requesting the location updates again.
    137                     sLocationManager = null;
    138                     throw e;
    139                 }
    140             }
    141         }
    142     }
    143 }
    144