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1 // Copyright 2014 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4 
5 package org.chromium.content.browser;
6 
7 import android.content.BroadcastReceiver;
8 import android.content.Context;
9 import android.content.Intent;
10 import android.content.IntentFilter;
11 import android.util.Log;
12 
13 import org.chromium.base.CalledByNative;
14 import org.chromium.base.JNINamespace;
15 
16 /**
17  * Android implementation details for content::TimeZoneMonitorAndroid.
18  */
19 @JNINamespace("content")
20 class TimeZoneMonitor {
21     private static final String TAG = "TimeZoneMonitor";
22 
23     private final Context mAppContext;
24     private final IntentFilter mFilter = new IntentFilter(Intent.ACTION_TIMEZONE_CHANGED);
25     private final BroadcastReceiver mBroadcastReceiver = new BroadcastReceiver() {
26         @Override
27         public void onReceive(Context context, Intent intent) {
28            if (!intent.getAction().equals(Intent.ACTION_TIMEZONE_CHANGED)) {
29                Log.e(TAG, "unexpected intent");
30                return;
31            }
32 
33            nativeTimeZoneChangedFromJava(mNativePtr);
34         }
35     };
36 
37     private long mNativePtr;
38 
39     /**
40      * Start listening for intents.
41      * @param nativePtr The native content::TimeZoneMonitorAndroid to notify of time zone changes.
42      */
TimeZoneMonitor(Context context, long nativePtr)43     private TimeZoneMonitor(Context context, long nativePtr) {
44         mAppContext = context.getApplicationContext();
45         mNativePtr = nativePtr;
46         mAppContext.registerReceiver(mBroadcastReceiver, mFilter);
47     }
48 
49     @CalledByNative
getInstance(Context context, long nativePtr)50     static TimeZoneMonitor getInstance(Context context, long nativePtr) {
51         return new TimeZoneMonitor(context, nativePtr);
52     }
53 
54     /**
55      * Stop listening for intents.
56      */
57     @CalledByNative
stop()58     void stop() {
59         mAppContext.unregisterReceiver(mBroadcastReceiver);
60         mNativePtr = 0;
61     }
62 
63     /**
64      * Native JNI call to content::TimeZoneMonitorAndroid::TimeZoneChanged.
65      * See content/browser/time_zone_monitor_android.cc.
66      */
nativeTimeZoneChangedFromJava(long nativeTimeZoneMonitorAndroid)67     private native void nativeTimeZoneChangedFromJava(long nativeTimeZoneMonitorAndroid);
68 }
69