1 /* 2 * Copyright (C) 2010 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.providers.calendar; 18 19 import com.android.providers.calendar.CalendarDatabaseHelper.Tables; 20 import com.android.providers.calendar.CalendarDatabaseHelper.Views; 21 import com.google.common.annotations.VisibleForTesting; 22 23 import android.app.AlarmManager; 24 import android.app.PendingIntent; 25 import android.content.ContentResolver; 26 import android.content.Context; 27 import android.content.Intent; 28 import android.database.Cursor; 29 import android.database.sqlite.SQLiteDatabase; 30 import android.net.Uri; 31 import android.os.PowerManager; 32 import android.os.PowerManager.WakeLock; 33 import android.os.SystemClock; 34 import android.provider.CalendarContract; 35 import android.provider.CalendarContract.CalendarAlerts; 36 import android.provider.CalendarContract.Calendars; 37 import android.provider.CalendarContract.Events; 38 import android.provider.CalendarContract.Instances; 39 import android.provider.CalendarContract.Reminders; 40 import android.text.format.DateUtils; 41 import android.text.format.Time; 42 import android.util.Log; 43 44 import java.util.concurrent.atomic.AtomicBoolean; 45 46 /** 47 * We are using the CalendarAlertManager to be able to mock the AlarmManager as the AlarmManager 48 * cannot be extended. 49 * 50 * CalendarAlertManager is delegating its calls to the real AlarmService. 51 */ 52 public class CalendarAlarmManager { 53 protected static final String TAG = "CalendarAlarmManager"; 54 55 // SCHEDULE_ALARM_URI runs scheduleNextAlarm(false) 56 // SCHEDULE_ALARM_REMOVE_URI runs scheduleNextAlarm(true) 57 // TODO: use a service to schedule alarms rather than private URI 58 /* package */static final String SCHEDULE_ALARM_PATH = "schedule_alarms"; 59 /* package */static final String SCHEDULE_ALARM_REMOVE_PATH = "schedule_alarms_remove"; 60 private static final String REMOVE_ALARM_VALUE = "removeAlarms"; 61 /* package */static final Uri SCHEDULE_ALARM_REMOVE_URI = Uri.withAppendedPath( 62 CalendarContract.CONTENT_URI, SCHEDULE_ALARM_REMOVE_PATH); 63 /* package */static final Uri SCHEDULE_ALARM_URI = Uri.withAppendedPath( 64 CalendarContract.CONTENT_URI, SCHEDULE_ALARM_PATH); 65 66 static final String INVALID_CALENDARALERTS_SELECTOR = 67 "_id IN (SELECT ca." + CalendarAlerts._ID + " FROM " 68 + Tables.CALENDAR_ALERTS + " AS ca" 69 + " LEFT OUTER JOIN " + Tables.INSTANCES 70 + " USING (" + Instances.EVENT_ID + "," 71 + Instances.BEGIN + "," + Instances.END + ")" 72 + " LEFT OUTER JOIN " + Tables.REMINDERS + " AS r ON" 73 + " (ca." + CalendarAlerts.EVENT_ID + "=r." + Reminders.EVENT_ID 74 + " AND ca." + CalendarAlerts.MINUTES + "=r." + Reminders.MINUTES + ")" 75 + " LEFT OUTER JOIN " + Views.EVENTS + " AS e ON" 76 + " (ca." + CalendarAlerts.EVENT_ID + "=e." + Events._ID + ")" 77 + " WHERE " + Tables.INSTANCES + "." + Instances.BEGIN + " ISNULL" 78 + " OR ca." + CalendarAlerts.ALARM_TIME + "<?" 79 + " OR (r." + Reminders.MINUTES + " ISNULL" 80 + " AND ca." + CalendarAlerts.MINUTES + "<>0)" 81 + " OR e." + Calendars.VISIBLE + "=0)"; 82 83 /** 84 * We search backward in time for event reminders that we may have missed 85 * and schedule them if the event has not yet expired. The amount in the 86 * past to search backwards is controlled by this constant. It should be at 87 * least a few minutes to allow for an event that was recently created on 88 * the web to make its way to the phone. Two hours might seem like overkill, 89 * but it is useful in the case where the user just crossed into a new 90 * timezone and might have just missed an alarm. 91 */ 92 private static final long SCHEDULE_ALARM_SLACK = 2 * DateUtils.HOUR_IN_MILLIS; 93 /** 94 * Alarms older than this threshold will be deleted from the CalendarAlerts 95 * table. This should be at least a day because if the timezone is wrong and 96 * the user corrects it we might delete good alarms that appear to be old 97 * because the device time was incorrectly in the future. This threshold 98 * must also be larger than SCHEDULE_ALARM_SLACK. We add the 99 * SCHEDULE_ALARM_SLACK to ensure this. To make it easier to find and debug 100 * problems with missed reminders, set this to something greater than a day. 101 */ 102 private static final long CLEAR_OLD_ALARM_THRESHOLD = 7 * DateUtils.DAY_IN_MILLIS 103 + SCHEDULE_ALARM_SLACK; 104 private static final String SCHEDULE_NEXT_ALARM_WAKE_LOCK = "ScheduleNextAlarmWakeLock"; 105 protected static final String ACTION_CHECK_NEXT_ALARM = 106 "com.android.providers.calendar.intent.CalendarProvider2"; 107 static final int ALARM_CHECK_DELAY_MILLIS = 5000; 108 109 /** 110 * Used for tracking if the next alarm is already scheduled 111 */ 112 @VisibleForTesting 113 protected AtomicBoolean mNextAlarmCheckScheduled; 114 /** 115 * Used for synchronization 116 */ 117 @VisibleForTesting 118 protected Object mAlarmLock; 119 /** 120 * Used to keep the process from getting killed while scheduling alarms 121 */ 122 private final WakeLock mScheduleNextAlarmWakeLock; 123 124 @VisibleForTesting 125 protected Context mContext; 126 private AlarmManager mAlarmManager; 127 128 public CalendarAlarmManager(Context context) { 129 initializeWithContext(context); 130 131 PowerManager powerManager = (PowerManager) mContext.getSystemService( 132 Context.POWER_SERVICE); 133 // Create a wake lock that will be used when we are actually 134 // scheduling the next alarm 135 mScheduleNextAlarmWakeLock = powerManager.newWakeLock( 136 PowerManager.PARTIAL_WAKE_LOCK, SCHEDULE_NEXT_ALARM_WAKE_LOCK); 137 // We want the Wake Lock to be reference counted (so that we dont 138 // need to take care 139 // about its reference counting) 140 mScheduleNextAlarmWakeLock.setReferenceCounted(true); 141 } 142 143 protected void initializeWithContext(Context context) { 144 mContext = context; 145 mAlarmManager = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE); 146 mNextAlarmCheckScheduled = new AtomicBoolean(false); 147 mAlarmLock = new Object(); 148 } 149 150 void scheduleNextAlarm(boolean removeAlarms) { 151 // We must always run the following when 'removeAlarms' is true. Previously it 152 // was possible to have a race condition on startup between TIME_CHANGED and 153 // BOOT_COMPLETED broadcast actions. This resulted in alarms being 154 // missed (Bug 7221716) when the TIME_CHANGED broadcast ('removeAlarms' = false) 155 // happened right before the BOOT_COMPLETED ('removeAlarms' = true), and the 156 // BOOT_COMPLETED action was skipped since there was concurrent scheduling in progress. 157 if (!mNextAlarmCheckScheduled.getAndSet(true) || removeAlarms) { 158 if (Log.isLoggable(CalendarProvider2.TAG, Log.DEBUG)) { 159 Log.d(CalendarProvider2.TAG, "Scheduling check of next Alarm"); 160 } 161 Intent intent = new Intent(ACTION_CHECK_NEXT_ALARM); 162 intent.putExtra(REMOVE_ALARM_VALUE, removeAlarms); 163 PendingIntent pending = PendingIntent.getBroadcast(mContext, 0 /* ignored */, intent, 164 PendingIntent.FLAG_NO_CREATE); 165 if (pending != null) { 166 // Cancel any previous Alarm check requests 167 cancel(pending); 168 } 169 pending = PendingIntent.getBroadcast(mContext, 0 /* ignored */, intent, 170 PendingIntent.FLAG_CANCEL_CURRENT); 171 172 // Trigger the check in 5s from now 173 long triggerAtTime = SystemClock.elapsedRealtime() + ALARM_CHECK_DELAY_MILLIS; 174 set(AlarmManager.ELAPSED_REALTIME_WAKEUP, triggerAtTime, pending); 175 } 176 } 177 178 PowerManager.WakeLock getScheduleNextAlarmWakeLock() { 179 return mScheduleNextAlarmWakeLock; 180 } 181 182 void acquireScheduleNextAlarmWakeLock() { 183 getScheduleNextAlarmWakeLock().acquire(); 184 } 185 186 void releaseScheduleNextAlarmWakeLock() { 187 try { 188 getScheduleNextAlarmWakeLock().release(); 189 } catch (RuntimeException e) { 190 if (!e.getMessage().startsWith("WakeLock under-locked ")) { 191 throw e; 192 } 193 Log.w(TAG, "WakeLock under-locked ignored."); 194 } 195 } 196 197 void rescheduleMissedAlarms() { 198 rescheduleMissedAlarms(mContext.getContentResolver()); 199 } 200 201 /** 202 * This method runs in a background thread and schedules an alarm for the 203 * next calendar event, if necessary. 204 * 205 * @param db TODO 206 */ 207 void runScheduleNextAlarm(boolean removeAlarms, CalendarProvider2 cp2) { 208 SQLiteDatabase db = cp2.mDb; 209 if (db == null) { 210 return; 211 } 212 213 // Reset so that we can accept other schedules of next alarm 214 mNextAlarmCheckScheduled.set(false); 215 db.beginTransaction(); 216 try { 217 if (removeAlarms) { 218 removeScheduledAlarmsLocked(db); 219 } 220 scheduleNextAlarmLocked(db, cp2); 221 db.setTransactionSuccessful(); 222 } finally { 223 db.endTransaction(); 224 } 225 } 226 227 void scheduleNextAlarmCheck(long triggerTime) { 228 Intent intent = new Intent(CalendarReceiver.SCHEDULE); 229 intent.setClass(mContext, CalendarReceiver.class); 230 PendingIntent pending = PendingIntent.getBroadcast( 231 mContext, 0, intent, PendingIntent.FLAG_NO_CREATE); 232 if (pending != null) { 233 // Cancel any previous alarms that do the same thing. 234 cancel(pending); 235 } 236 pending = PendingIntent.getBroadcast( 237 mContext, 0, intent, PendingIntent.FLAG_CANCEL_CURRENT); 238 239 if (Log.isLoggable(CalendarProvider2.TAG, Log.DEBUG)) { 240 Time time = new Time(); 241 time.set(triggerTime); 242 String timeStr = time.format(" %a, %b %d, %Y %I:%M%P"); 243 Log.d(CalendarProvider2.TAG, "scheduleNextAlarmCheck at: " + triggerTime + timeStr); 244 } 245 246 set(AlarmManager.RTC_WAKEUP, triggerTime, pending); 247 } 248 249 /** 250 * This method looks at the 24-hour window from now for any events that it 251 * needs to schedule. This method runs within a database transaction. It 252 * also runs in a background thread. The CalendarProvider2 keeps track of 253 * which alarms it has already scheduled to avoid scheduling them more than 254 * once and for debugging problems with alarms. It stores this knowledge in 255 * a database table called CalendarAlerts which persists across reboots. But 256 * the actual alarm list is in memory and disappears if the phone loses 257 * power. To avoid missing an alarm, we clear the entries in the 258 * CalendarAlerts table when we start up the CalendarProvider2. Scheduling 259 * an alarm multiple times is not tragic -- we filter out the extra ones 260 * when we receive them. But we still need to keep track of the scheduled 261 * alarms. The main reason is that we need to prevent multiple notifications 262 * for the same alarm (on the receive side) in case we accidentally schedule 263 * the same alarm multiple times. We don't have visibility into the system's 264 * alarm list so we can never know for sure if we have already scheduled an 265 * alarm and it's better to err on scheduling an alarm twice rather than 266 * missing an alarm. Another reason we keep track of scheduled alarms in a 267 * database table is that it makes it easy to run an SQL query to find the 268 * next reminder that we haven't scheduled. 269 * 270 * @param db the database 271 * @param cp2 TODO 272 */ 273 private void scheduleNextAlarmLocked(SQLiteDatabase db, CalendarProvider2 cp2) { 274 Time time = new Time(); 275 276 final long currentMillis = System.currentTimeMillis(); 277 final long start = currentMillis - SCHEDULE_ALARM_SLACK; 278 final long end = start + (24 * 60 * 60 * 1000); 279 if (Log.isLoggable(CalendarProvider2.TAG, Log.DEBUG)) { 280 time.set(start); 281 String startTimeStr = time.format(" %a, %b %d, %Y %I:%M%P"); 282 Log.d(CalendarProvider2.TAG, "runScheduleNextAlarm() start search: " + startTimeStr); 283 } 284 285 // Delete rows in CalendarAlert where the corresponding Instance or 286 // Reminder no longer exist. 287 // Also clear old alarms but keep alarms around for a while to prevent 288 // multiple alerts for the same reminder. The "clearUpToTime' 289 // should be further in the past than the point in time where 290 // we start searching for events (the "start" variable defined above). 291 String selectArg[] = new String[] { Long.toString( 292 currentMillis - CLEAR_OLD_ALARM_THRESHOLD) }; 293 294 int rowsDeleted = db.delete( 295 CalendarAlerts.TABLE_NAME, INVALID_CALENDARALERTS_SELECTOR, selectArg); 296 297 long nextAlarmTime = end; 298 final ContentResolver resolver = mContext.getContentResolver(); 299 final long tmpAlarmTime = CalendarAlerts.findNextAlarmTime(resolver, currentMillis); 300 if (tmpAlarmTime != -1 && tmpAlarmTime < nextAlarmTime) { 301 nextAlarmTime = tmpAlarmTime; 302 } 303 304 // Extract events from the database sorted by alarm time. The 305 // alarm times are computed from Instances.begin (whose units 306 // are milliseconds) and Reminders.minutes (whose units are 307 // minutes). 308 // 309 // Also, ignore events whose end time is already in the past. 310 // Also, ignore events alarms that we have already scheduled. 311 // 312 // Note 1: we can add support for the case where Reminders.minutes 313 // equals -1 to mean use Calendars.minutes by adding a UNION for 314 // that case where the two halves restrict the WHERE clause on 315 // Reminders.minutes != -1 and Reminders.minutes = 1, respectively. 316 // 317 // Note 2: we have to name "myAlarmTime" different from the 318 // "alarmTime" column in CalendarAlerts because otherwise the 319 // query won't find multiple alarms for the same event. 320 // 321 // The CAST is needed in the query because otherwise the expression 322 // will be untyped and sqlite3's manifest typing will not convert the 323 // string query parameter to an int in myAlarmtime>=?, so the comparison 324 // will fail. This could be simplified if bug 2464440 is resolved. 325 326 time.setToNow(); 327 time.normalize(false); 328 long localOffset = time.gmtoff * 1000; 329 330 String allDayOffset = " -(" + localOffset + ") "; 331 String subQueryPrefix = "SELECT " + Instances.BEGIN; 332 String subQuerySuffix = " -(" + Reminders.MINUTES + "*" + +DateUtils.MINUTE_IN_MILLIS + ")" 333 + " AS myAlarmTime" + "," + Tables.INSTANCES + "." + Instances.EVENT_ID 334 + " AS eventId" + "," + Instances.BEGIN + "," + Instances.END + "," 335 + Instances.TITLE + "," + Instances.ALL_DAY + "," + Reminders.METHOD + "," 336 + Reminders.MINUTES + " FROM " + Tables.INSTANCES + " INNER JOIN " + Views.EVENTS 337 + " ON (" + Views.EVENTS + "." + Events._ID + "=" + Tables.INSTANCES + "." 338 + Instances.EVENT_ID + ")" + " INNER JOIN " + Tables.REMINDERS + " ON (" 339 + Tables.INSTANCES + "." + Instances.EVENT_ID + "=" + Tables.REMINDERS + "." 340 + Reminders.EVENT_ID + ")" + " WHERE " + Calendars.VISIBLE + "=1" 341 + " AND myAlarmTime>=CAST(? AS INT)" + " AND myAlarmTime<=CAST(? AS INT)" + " AND " 342 + Instances.END + ">=?" + " AND " + Reminders.METHOD + "=" + Reminders.METHOD_ALERT; 343 344 // we query separately for all day events to convert to local time from 345 // UTC 346 // we need to /subtract/ the offset to get the correct resulting local 347 // time 348 String allDayQuery = subQueryPrefix + allDayOffset + subQuerySuffix + " AND " 349 + Instances.ALL_DAY + "=1"; 350 String nonAllDayQuery = subQueryPrefix + subQuerySuffix + " AND " + Instances.ALL_DAY 351 + "=0"; 352 353 // we use UNION ALL because we are guaranteed to have no dupes between 354 // the two queries, and it is less expensive 355 String query = "SELECT *" + " FROM (" + allDayQuery + " UNION ALL " + nonAllDayQuery + ")" 356 // avoid rescheduling existing alarms 357 + " WHERE 0=(SELECT count(*) FROM " + Tables.CALENDAR_ALERTS + " CA" + " WHERE CA." 358 + CalendarAlerts.EVENT_ID + "=eventId" + " AND CA." + CalendarAlerts.BEGIN + "=" 359 + Instances.BEGIN + " AND CA." + CalendarAlerts.ALARM_TIME + "=myAlarmTime)" 360 + " ORDER BY myAlarmTime," + Instances.BEGIN + "," + Instances.TITLE; 361 362 String queryParams[] = new String[] { String.valueOf(start), String.valueOf(nextAlarmTime), 363 String.valueOf(currentMillis), String.valueOf(start), String.valueOf(nextAlarmTime), 364 String.valueOf(currentMillis) }; 365 366 String instancesTimezone = cp2.mCalendarCache.readTimezoneInstances(); 367 final String timezoneType = cp2.mCalendarCache.readTimezoneType(); 368 boolean isHomeTimezone = CalendarCache.TIMEZONE_TYPE_HOME.equals(timezoneType); 369 // expand this range by a day on either end to account for all day 370 // events 371 cp2.acquireInstanceRangeLocked( 372 start - DateUtils.DAY_IN_MILLIS, end + DateUtils.DAY_IN_MILLIS, false /* 373 * don't 374 * use 375 * minimum 376 * expansion 377 * windows 378 */, 379 false /* do not force Instances deletion and expansion */, instancesTimezone, 380 isHomeTimezone); 381 Cursor cursor = null; 382 try { 383 cursor = db.rawQuery(query, queryParams); 384 385 final int beginIndex = cursor.getColumnIndex(Instances.BEGIN); 386 final int endIndex = cursor.getColumnIndex(Instances.END); 387 final int eventIdIndex = cursor.getColumnIndex("eventId"); 388 final int alarmTimeIndex = cursor.getColumnIndex("myAlarmTime"); 389 final int minutesIndex = cursor.getColumnIndex(Reminders.MINUTES); 390 391 if (Log.isLoggable(CalendarProvider2.TAG, Log.DEBUG)) { 392 time.set(nextAlarmTime); 393 String alarmTimeStr = time.format(" %a, %b %d, %Y %I:%M%P"); 394 Log.d(CalendarProvider2.TAG, 395 "cursor results: " + cursor.getCount() + " nextAlarmTime: " + alarmTimeStr); 396 } 397 398 while (cursor.moveToNext()) { 399 // Schedule all alarms whose alarm time is as early as any 400 // scheduled alarm. For example, if the earliest alarm is at 401 // 1pm, then we will schedule all alarms that occur at 1pm 402 // but no alarms that occur later than 1pm. 403 // Actually, we allow alarms up to a minute later to also 404 // be scheduled so that we don't have to check immediately 405 // again after an event alarm goes off. 406 final long alarmTime = cursor.getLong(alarmTimeIndex); 407 final long eventId = cursor.getLong(eventIdIndex); 408 final int minutes = cursor.getInt(minutesIndex); 409 final long startTime = cursor.getLong(beginIndex); 410 final long endTime = cursor.getLong(endIndex); 411 412 if (Log.isLoggable(CalendarProvider2.TAG, Log.DEBUG)) { 413 time.set(alarmTime); 414 String schedTime = time.format(" %a, %b %d, %Y %I:%M%P"); 415 time.set(startTime); 416 String startTimeStr = time.format(" %a, %b %d, %Y %I:%M%P"); 417 418 Log.d(CalendarProvider2.TAG, 419 " looking at id: " + eventId + " " + startTime + startTimeStr 420 + " alarm: " + alarmTime + schedTime); 421 } 422 423 if (alarmTime < nextAlarmTime) { 424 nextAlarmTime = alarmTime; 425 } else if (alarmTime > nextAlarmTime + DateUtils.MINUTE_IN_MILLIS) { 426 // This event alarm (and all later ones) will be scheduled 427 // later. 428 if (Log.isLoggable(CalendarProvider2.TAG, Log.DEBUG)) { 429 Log.d(CalendarProvider2.TAG, 430 "This event alarm (and all later ones) will be scheduled later"); 431 } 432 break; 433 } 434 435 // Avoid an SQLiteContraintException by checking if this alarm 436 // already exists in the table. 437 if (CalendarAlerts.alarmExists(resolver, eventId, startTime, alarmTime)) { 438 if (Log.isLoggable(CalendarProvider2.TAG, Log.DEBUG)) { 439 int titleIndex = cursor.getColumnIndex(Events.TITLE); 440 String title = cursor.getString(titleIndex); 441 Log.d(CalendarProvider2.TAG, 442 " alarm exists for id: " + eventId + " " + title); 443 } 444 continue; 445 } 446 447 // Insert this alarm into the CalendarAlerts table 448 Uri uri = CalendarAlerts.insert( 449 resolver, eventId, startTime, endTime, alarmTime, minutes); 450 if (uri == null) { 451 if (Log.isLoggable(CalendarProvider2.TAG, Log.ERROR)) { 452 Log.e(CalendarProvider2.TAG, "runScheduleNextAlarm() insert into " 453 + "CalendarAlerts table failed"); 454 } 455 continue; 456 } 457 458 scheduleAlarm(alarmTime); 459 } 460 } finally { 461 if (cursor != null) { 462 cursor.close(); 463 } 464 } 465 466 // Refresh notification bar 467 if (rowsDeleted > 0) { 468 scheduleAlarm(currentMillis); 469 } 470 471 // If we scheduled an event alarm, then schedule the next alarm check 472 // for one minute past that alarm. Otherwise, if there were no 473 // event alarms scheduled, then check again in 24 hours. If a new 474 // event is inserted before the next alarm check, then this method 475 // will be run again when the new event is inserted. 476 if (nextAlarmTime != Long.MAX_VALUE) { 477 scheduleNextAlarmCheck(nextAlarmTime + DateUtils.MINUTE_IN_MILLIS); 478 } else { 479 scheduleNextAlarmCheck(currentMillis + DateUtils.DAY_IN_MILLIS); 480 } 481 } 482 483 /** 484 * Removes the entries in the CalendarAlerts table for alarms that we have 485 * scheduled but that have not fired yet. We do this to ensure that we don't 486 * miss an alarm. The CalendarAlerts table keeps track of the alarms that we 487 * have scheduled but the actual alarm list is in memory and will be cleared 488 * if the phone reboots. We don't need to remove entries that have already 489 * fired, and in fact we should not remove them because we need to display 490 * the notifications until the user dismisses them. We could remove entries 491 * that have fired and been dismissed, but we leave them around for a while 492 * because it makes it easier to debug problems. Entries that are old enough 493 * will be cleaned up later when we schedule new alarms. 494 */ 495 private static void removeScheduledAlarmsLocked(SQLiteDatabase db) { 496 if (Log.isLoggable(CalendarProvider2.TAG, Log.DEBUG)) { 497 Log.d(CalendarProvider2.TAG, "removing scheduled alarms"); 498 } 499 db.delete(CalendarAlerts.TABLE_NAME, CalendarAlerts.STATE + "=" 500 + CalendarAlerts.STATE_SCHEDULED, null /* whereArgs */); 501 } 502 503 public void set(int type, long triggerAtTime, PendingIntent operation) { 504 mAlarmManager.setExact(type, triggerAtTime, operation); 505 } 506 507 public void cancel(PendingIntent operation) { 508 mAlarmManager.cancel(operation); 509 } 510 511 public void scheduleAlarm(long alarmTime) { 512 CalendarContract.CalendarAlerts.scheduleAlarm(mContext, mAlarmManager, alarmTime); 513 } 514 515 public void rescheduleMissedAlarms(ContentResolver cr) { 516 CalendarContract.CalendarAlerts.rescheduleMissedAlarms(cr, mContext, mAlarmManager); 517 } 518 } 519
