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      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 static com.android.cellbroadcastreceiver.CellBroadcastReceiver.DBG;
     20 
     21 import android.app.AlarmManager;
     22 import android.app.PendingIntent;
     23 import android.app.Service;
     24 import android.content.Context;
     25 import android.content.Intent;
     26 import android.content.SharedPreferences;
     27 import android.media.AudioManager;
     28 import android.media.Ringtone;
     29 import android.media.RingtoneManager;
     30 import android.net.Uri;
     31 import android.os.IBinder;
     32 import android.os.SystemClock;
     33 import android.os.VibrationEffect;
     34 import android.os.Vibrator;
     35 import android.preference.PreferenceManager;
     36 import android.util.Log;
     37 
     38 /**
     39  * Manages alert reminder notification.
     40  */
     41 public class CellBroadcastAlertReminder extends Service {
     42     private static final String TAG = "CellBroadcastAlertReminder";
     43 
     44     /** Action to wake up and play alert reminder sound. */
     45     private static final String ACTION_PLAY_ALERT_REMINDER = "ACTION_PLAY_ALERT_REMINDER";
     46 
     47     /** Extra for alert reminder vibration enabled (from settings). */
     48     private static final String ALERT_REMINDER_VIBRATE_EXTRA = "alert_reminder_vibrate_extra";
     49 
     50     /**
     51      * Pending intent for alert reminder. This is static so that we don't have to start the
     52      * service in order to cancel any pending reminders when user dismisses the alert dialog.
     53      */
     54     private static PendingIntent sPlayReminderIntent;
     55 
     56     /**
     57      * Alert reminder for current ringtone being played.
     58      */
     59     private static Ringtone sPlayReminderRingtone;
     60 
     61     @Override
     62     public IBinder onBind(Intent intent) {
     63         return null;
     64     }
     65 
     66     @Override
     67     public int onStartCommand(Intent intent, int flags, int startId) {
     68         // No intent or unrecognized action; tell the system not to restart us.
     69         if (intent == null || !ACTION_PLAY_ALERT_REMINDER.equals(intent.getAction())) {
     70             stopSelf();
     71             return START_NOT_STICKY;
     72         }
     73 
     74         log("playing alert reminder");
     75         playAlertReminderSound(intent.getBooleanExtra(ALERT_REMINDER_VIBRATE_EXTRA, true));
     76 
     77         if (queueAlertReminder(this, false)) {
     78             return START_STICKY;
     79         } else {
     80             log("no reminders queued");
     81             stopSelf();
     82             return START_NOT_STICKY;
     83         }
     84     }
     85 
     86     /**
     87      * Use the RingtoneManager to play the alert reminder sound.
     88      *
     89      * @param enableVibration True to enable vibration when the alert reminder tone is playing,
     90      *                        otherwise false.
     91      */
     92     private void playAlertReminderSound(boolean enableVibration) {
     93         Uri notificationUri = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);
     94         if (notificationUri == null) {
     95             loge("Can't get URI for alert reminder sound");
     96             return;
     97         }
     98         Ringtone r = RingtoneManager.getRingtone(this, notificationUri);
     99         r.setStreamType(AudioManager.STREAM_NOTIFICATION);
    100 
    101         // Acquire the wakelock for 500ms. The wakelock will be released by its
    102         // timer.
    103         CellBroadcastAlertWakeLock.acquirePartialWakeLock(getApplicationContext(), 500);
    104         if (r != null) {
    105             log("playing alert reminder sound");
    106             r.play();
    107         } else {
    108             loge("can't get Ringtone for alert reminder sound");
    109         }
    110 
    111         if (enableVibration) {
    112             // Vibrate for 500ms.
    113             Vibrator vibrator = (Vibrator) getSystemService(Context.VIBRATOR_SERVICE);
    114             vibrator.vibrate(VibrationEffect.createOneShot(500, VibrationEffect.DEFAULT_AMPLITUDE));
    115         }
    116     }
    117 
    118     /**
    119      * Helper method to start the alert reminder service to queue the alert reminder.
    120      *
    121      * @param context Context.
    122      * @param firstTime True if entering this method for the first time, otherwise false.
    123      *
    124      * @return true if a pending reminder was set; false if there are no more reminders
    125      */
    126     static boolean queueAlertReminder(Context context, boolean firstTime) {
    127         // Stop any alert reminder sound and cancel any previously queued reminders.
    128         cancelAlertReminder();
    129 
    130         SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(context);
    131         String prefStr = prefs.getString(CellBroadcastSettings.KEY_ALERT_REMINDER_INTERVAL, null);
    132 
    133         if (prefStr == null) {
    134             if (DBG) log("no preference value for alert reminder");
    135             return false;
    136         }
    137 
    138         int interval;
    139         try {
    140             interval = Integer.valueOf(prefStr);
    141         } catch (NumberFormatException ignored) {
    142             loge("invalid alert reminder interval preference: " + prefStr);
    143             return false;
    144         }
    145 
    146         if (interval == 0 || (interval == 1 && !firstTime)) {
    147             return false;
    148         }
    149         if (interval == 1) {
    150             interval = 2;   // "1" = one reminder after 2 minutes
    151         }
    152 
    153         if (DBG) log("queueAlertReminder() in " + interval + " minutes");
    154 
    155         Intent playIntent = new Intent(context, CellBroadcastAlertReminder.class);
    156         playIntent.setAction(ACTION_PLAY_ALERT_REMINDER);
    157         playIntent.putExtra(ALERT_REMINDER_VIBRATE_EXTRA,
    158                 prefs.getBoolean(CellBroadcastSettings.KEY_ENABLE_ALERT_VIBRATE, true));
    159         sPlayReminderIntent = PendingIntent.getService(context, 0, playIntent,
    160                 PendingIntent.FLAG_UPDATE_CURRENT);
    161 
    162         AlarmManager alarmManager = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
    163         if (alarmManager == null) {
    164             loge("can't get Alarm Service");
    165             return false;
    166         }
    167 
    168         // remind user after 2 minutes or 15 minutes
    169         long triggerTime = SystemClock.elapsedRealtime() + (interval * 60000);
    170         // We use setExact instead of set because this is for emergency reminder.
    171         alarmManager.setExact(AlarmManager.ELAPSED_REALTIME_WAKEUP,
    172                 triggerTime, sPlayReminderIntent);
    173         log("Set reminder in " + interval + " minutes");
    174         return true;
    175     }
    176 
    177     /**
    178      * Stops alert reminder and cancels any queued reminders.
    179      */
    180     static void cancelAlertReminder() {
    181         if (DBG) log("cancelAlertReminder()");
    182         if (sPlayReminderRingtone != null) {
    183             if (DBG) log("stopping play reminder ringtone");
    184             sPlayReminderRingtone.stop();
    185             sPlayReminderRingtone = null;
    186         }
    187         if (sPlayReminderIntent != null) {
    188             if (DBG) log("canceling pending play reminder intent");
    189             sPlayReminderIntent.cancel();
    190             sPlayReminderIntent = null;
    191         }
    192     }
    193 
    194     private static void log(String msg) {
    195         Log.d(TAG, msg);
    196     }
    197 
    198     private static void loge(String msg) {
    199         Log.e(TAG, msg);
    200     }
    201 }
    202