1/*
2 * Copyright (C) 2010 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
5 * use this file except in compliance with the License. You may obtain a copy of
6 * 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, WITHOUT
12 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
13 * License for the specific language governing permissions and limitations under
14 * the License
15 */
16
17package com.android.providers.contacts;
18
19import android.content.Context;
20import android.location.Country;
21import android.location.CountryDetector;
22import android.location.CountryListener;
23import android.os.Looper;
24
25import java.util.Locale;
26
27/**
28 * This class monitors the change of country.
29 * <p>
30 * {@link #getCountryIso()} is used to get the ISO 3166-1 two letters country
31 * code of current country.
32 */
33public class CountryMonitor {
34    private String mCurrentCountryIso;
35    private Context mContext;
36
37    public CountryMonitor(Context context) {
38        mContext = context;
39    }
40
41    /**
42     * Get the current country code
43     *
44     * @return the ISO 3166-1 two letters country code of current country.
45     */
46    public synchronized String getCountryIso() {
47        if (mCurrentCountryIso == null) {
48            final CountryDetector countryDetector =
49                    (CountryDetector) mContext.getSystemService(Context.COUNTRY_DETECTOR);
50            Country country = null;
51            if (countryDetector != null) country = countryDetector.detectCountry();
52
53            if (country == null) {
54                // Fallback to Locale if there are issues with CountryDetector
55                return Locale.getDefault().getCountry();
56            }
57
58            mCurrentCountryIso = country.getCountryIso();
59                countryDetector.addCountryListener(new CountryListener() {
60                    public void onCountryDetected(Country country) {
61                        mCurrentCountryIso = country.getCountryIso();
62                    }
63                }, Looper.getMainLooper());
64        }
65        return mCurrentCountryIso;
66    }
67}
68