1 /*
2  * Copyright (C) 2013 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.cellbroadcastreceiver;
18 
19 import android.app.AlarmManager;
20 import android.app.PendingIntent;
21 import android.app.Service;
22 import android.content.Context;
23 import android.content.Intent;
24 import android.content.SharedPreferences;
25 import android.media.Ringtone;
26 import android.media.RingtoneManager;
27 import android.net.Uri;
28 import android.os.IBinder;
29 import android.os.SystemClock;
30 import android.preference.PreferenceManager;
31 import android.util.Log;
32 import android.media.AudioManager;
33 import static com.android.cellbroadcastreceiver.CellBroadcastReceiver.DBG;
34 
35 /**
36  * Manages alert reminder notification.
37  */
38 public class CellBroadcastAlertReminder extends Service {
39     private static final String TAG = "CellBroadcastAlertReminder";
40 
41     /** Action to wake up and play alert reminder sound. */
42     static final String ACTION_PLAY_ALERT_REMINDER = "ACTION_PLAY_ALERT_REMINDER";
43 
44     /**
45      * Pending intent for alert reminder. This is static so that we don't have to start the
46      * service in order to cancel any pending reminders when user dismisses the alert dialog.
47      */
48     private static PendingIntent sPlayReminderIntent;
49 
50     /**
51      * Alert reminder for current ringtone being played.
52      */
53     private static Ringtone sPlayReminderRingtone;
54 
55     @Override
onBind(Intent intent)56     public IBinder onBind(Intent intent) {
57         return null;
58     }
59 
60     @Override
onStartCommand(Intent intent, int flags, int startId)61     public int onStartCommand(Intent intent, int flags, int startId) {
62         // No intent or unrecognized action; tell the system not to restart us.
63         if (intent == null || !ACTION_PLAY_ALERT_REMINDER.equals(intent.getAction())) {
64             stopSelf();
65             return START_NOT_STICKY;
66         }
67 
68         log("playing alert reminder");
69         playAlertReminderSound();
70 
71         if (queueAlertReminder(this, false)) {
72             return START_STICKY;
73         } else {
74             log("no reminders queued");
75             stopSelf();
76             return START_NOT_STICKY;
77         }
78     }
79 
80     /**
81      * Use the RingtoneManager to play the alert reminder sound.
82      */
playAlertReminderSound()83     private void playAlertReminderSound() {
84         Uri notificationUri = RingtoneManager.getDefaultUri(
85                 RingtoneManager.TYPE_NOTIFICATION);
86         if (notificationUri == null) {
87             loge("Can't get URI for alert reminder sound");
88             return;
89         }
90         Ringtone r = RingtoneManager.getRingtone(this, notificationUri);
91         r.setStreamType(AudioManager.STREAM_NOTIFICATION);
92 
93         if (r != null) {
94             log("playing alert reminder sound");
95             r.play();
96         } else {
97             loge("can't get Ringtone for alert reminder sound");
98         }
99     }
100 
101     /**
102      * Helper method to start the alert reminder service to queue the alert reminder.
103      * @return true if a pending reminder was set; false if there are no more reminders
104      */
queueAlertReminder(Context context, boolean firstTime)105     static boolean queueAlertReminder(Context context, boolean firstTime) {
106         // Stop any alert reminder sound and cancel any previously queued reminders.
107         cancelAlertReminder();
108 
109         SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(context);
110         String prefStr = prefs.getString(CellBroadcastSettings.KEY_ALERT_REMINDER_INTERVAL, null);
111 
112         if (prefStr == null) {
113             if (DBG) log("no preference value for alert reminder");
114             return false;
115         }
116 
117         int interval;
118         try {
119             interval = Integer.valueOf(prefStr);
120         } catch (NumberFormatException ignored) {
121             loge("invalid alert reminder interval preference: " + prefStr);
122             return false;
123         }
124 
125         if (interval == 0 || (interval == 1 && !firstTime)) {
126             return false;
127         }
128         if (interval == 1) {
129             interval = 2;   // "1" = one reminder after 2 minutes
130         }
131 
132         if (DBG) log("queueAlertReminder() in " + interval + " minutes");
133 
134         Intent playIntent = new Intent(context, CellBroadcastAlertReminder.class);
135         playIntent.setAction(ACTION_PLAY_ALERT_REMINDER);
136         sPlayReminderIntent = PendingIntent.getService(context, 0, playIntent,
137                 PendingIntent.FLAG_UPDATE_CURRENT);
138 
139         AlarmManager alarmManager = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
140         if (alarmManager == null) {
141             loge("can't get Alarm Service");
142             return false;
143         }
144 
145         // remind user after 2 minutes or 15 minutes
146         long triggerTime = SystemClock.elapsedRealtime() + (interval * 60000);
147         // We use setExact instead of set because this is for emergency reminder.
148         alarmManager.setExact(AlarmManager.ELAPSED_REALTIME_WAKEUP,
149                 triggerTime, sPlayReminderIntent);
150         return true;
151     }
152 
153     /**
154      * Stops alert reminder and cancels any queued reminders.
155      */
cancelAlertReminder()156     static void cancelAlertReminder() {
157         if (DBG) log("cancelAlertReminder()");
158         if (sPlayReminderRingtone != null) {
159             if (DBG) log("stopping play reminder ringtone");
160             sPlayReminderRingtone.stop();
161             sPlayReminderRingtone = null;
162         }
163         if (sPlayReminderIntent != null) {
164             if (DBG) log("canceling pending play reminder intent");
165             sPlayReminderIntent.cancel();
166             sPlayReminderIntent = null;
167         }
168     }
169 
log(String msg)170     private static void log(String msg) {
171         Log.d(TAG, msg);
172     }
173 
loge(String msg)174     private static void loge(String msg) {
175         Log.e(TAG, msg);
176     }
177 }
178