src/com/android/calendar/alerts/AlertUtils.java - platform/packages/apps/Calendar - Git at Google

 /*
  * Copyright (C) 2012 The Android Open Source Project
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
  *      http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License
  */

 package com.android.calendar.alerts;

 import android.app.AlarmManager;
 import android.app.PendingIntent;
 import android.content.ContentUris;
 import android.content.ContentValues;
 import android.content.Context;
 import android.content.Intent;
 import android.content.SharedPreferences;
 import android.net.Uri;
 import android.provider.CalendarContract;
 import android.provider.CalendarContract.CalendarAlerts;
 import android.text.TextUtils;
 import android.text.format.DateFormat;
 import android.text.format.DateUtils;
 import android.text.format.Time;
 import android.util.Log;

 import com.android.calendar.EventInfoActivity;
 import com.android.calendar.R;
 import com.android.calendar.Utils;

 import java.util.Locale;
 import java.util.Map;
 import java.util.TimeZone;

 public class AlertUtils {
     private static final String TAG = "AlertUtils";
     static final boolean DEBUG = true;

     public static final long SNOOZE_DELAY = 5 * 60 * 1000L;

     // We use one notification id for the expired events notification.  All
     // other notifications (the 'active' future/concurrent ones) use a unique ID.
     public static final int EXPIRED_GROUP_NOTIFICATION_ID = 0;

     public static final String EVENT_ID_KEY = "eventid";
     public static final String SHOW_EVENT_KEY = "showevent";
     public static final String EVENT_START_KEY = "eventstart";
     public static final String EVENT_END_KEY = "eventend";
     public static final String NOTIFICATION_ID_KEY = "notificationid";
     public static final String EVENT_IDS_KEY = "eventids";
     public static final String EVENT_STARTS_KEY = "starts";

     // A flag for using local storage to save alert state instead of the alerts DB table.
     // This allows the unbundled app to run alongside other calendar apps without eating
     // alerts from other apps.
     static boolean BYPASS_DB = true;

     // SharedPrefs table name for storing fired alerts.  This prevents other installed
     // Calendar apps from eating the alerts.
     private static final String ALERTS_SHARED_PREFS_NAME = "calendar_alerts";

     // Keyname prefix for the alerts data in SharedPrefs.  The key will contain a combo
     // of event ID, begin time, and alarm time.  The value will be the fired time.
     private static final String KEY_FIRED_ALERT_PREFIX = "preference_alert_";

     // The last time the SharedPrefs was scanned and flushed of old alerts data.
     private static final String KEY_LAST_FLUSH_TIME_MS = "preference_flushTimeMs";

     // The # of days to save alert states in the shared prefs table, before flushing.  This
     // can be any value, since AlertService will also check for a recent alertTime before
     // ringing the alert.
     private static final int FLUSH_INTERVAL_DAYS = 1;
     private static final int FLUSH_INTERVAL_MS = FLUSH_INTERVAL_DAYS * 24 * 60 * 60 * 1000;

     /**
      * Creates an AlarmManagerInterface that wraps a real AlarmManager.  The alarm code
      * was abstracted to an interface to make it testable.
      */
     public static AlarmManagerInterface createAlarmManager(Context context) {
         final AlarmManager mgr = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
         return new AlarmManagerInterface() {
             @Override
             public void set(int type, long triggerAtMillis, PendingIntent operation) {
                 mgr.set(type, triggerAtMillis, operation);
             }
         };
     }

     /**
      * Schedules an alarm intent with the system AlarmManager that will notify
      * listeners when a reminder should be fired. The provider will keep
      * scheduled reminders up to date but apps may use this to implement snooze
      * functionality without modifying the reminders table. Scheduled alarms
      * will generate an intent using AlertReceiver.EVENT_REMINDER_APP_ACTION.
      *
      * @param context A context for referencing system resources
      * @param manager The AlarmManager to use or null
      * @param alarmTime The time to fire the intent in UTC millis since epoch
      */
     public static void scheduleAlarm(Context context, AlarmManagerInterface manager,
             long alarmTime) {
         scheduleAlarmHelper(context, manager, alarmTime, false);
     }

     /**
      * Schedules the next alarm to silently refresh the notifications.  Note that if there
      * is a pending silent refresh alarm, it will be replaced with this one.
      */
     static void scheduleNextNotificationRefresh(Context context, AlarmManagerInterface manager,
             long alarmTime) {
         scheduleAlarmHelper(context, manager, alarmTime, true);
     }

     private static void scheduleAlarmHelper(Context context, AlarmManagerInterface manager,
             long alarmTime, boolean quietUpdate) {
         int alarmType = AlarmManager.RTC_WAKEUP;
         Intent intent = new Intent(AlertReceiver.EVENT_REMINDER_APP_ACTION);
         intent.setClass(context, AlertReceiver.class);
         if (quietUpdate) {
             alarmType = AlarmManager.RTC;
         } else {
             // Set data field so we get a unique PendingIntent instance per alarm or else alarms
             // may be dropped.
             Uri.Builder builder = CalendarAlerts.CONTENT_URI.buildUpon();
             ContentUris.appendId(builder, alarmTime);
             intent.setData(builder.build());
         }

         intent.putExtra(CalendarContract.CalendarAlerts.ALARM_TIME, alarmTime);
         PendingIntent pi = PendingIntent.getBroadcast(context, 0, intent,
                 PendingIntent.FLAG_UPDATE_CURRENT);
         manager.set(alarmType, alarmTime, pi);
     }

     /**
      * Format the second line which shows time and location for single alert or the
      * number of events for multiple alerts
      *     1) Show time only for non-all day events
      *     2) No date for today
      *     3) Show "tomorrow" for tomorrow
      *     4) Show date for days beyond that
      */
     static String formatTimeLocation(Context context, long startMillis, boolean allDay,
             String location) {
         String tz = Utils.getTimeZone(context, null);
         Time time = new Time(tz);
         time.setToNow();
         int today = Time.getJulianDay(time.toMillis(false), time.gmtoff);
         time.set(startMillis);
         int eventDay = Time.getJulianDay(time.toMillis(false), allDay ? 0 : time.gmtoff);

         int flags = DateUtils.FORMAT_ABBREV_ALL;
         if (!allDay) {
             flags |= DateUtils.FORMAT_SHOW_TIME;
             if (DateFormat.is24HourFormat(context)) {
                 flags |= DateUtils.FORMAT_24HOUR;
             }
         } else {
             flags |= DateUtils.FORMAT_UTC;
         }

         if (eventDay < today || eventDay > today + 1) {
             flags |= DateUtils.FORMAT_SHOW_DATE;
         }

         StringBuilder sb = new StringBuilder(Utils.formatDateRange(context, startMillis,
                 startMillis, flags));

         if (!allDay && tz != Time.getCurrentTimezone()) {
             // Assumes time was set to the current tz
             time.set(startMillis);
             boolean isDST = time.isDst != 0;
             sb.append(" ").append(TimeZone.getTimeZone(tz).getDisplayName(
                     isDST, TimeZone.SHORT, Locale.getDefault()));
         }

         if (eventDay == today + 1) {
             // Tomorrow
             sb.append(", ");
             sb.append(context.getString(R.string.tomorrow));
         }

         String loc;
         if (location != null && !TextUtils.isEmpty(loc = location.trim())) {
             sb.append(", ");
             sb.append(loc);
         }
         return sb.toString();
     }

     public static ContentValues makeContentValues(long eventId, long begin, long end,
             long alarmTime, int minutes) {
         ContentValues values = new ContentValues();
         values.put(CalendarAlerts.EVENT_ID, eventId);
         values.put(CalendarAlerts.BEGIN, begin);
         values.put(CalendarAlerts.END, end);
         values.put(CalendarAlerts.ALARM_TIME, alarmTime);
         long currentTime = System.currentTimeMillis();
         values.put(CalendarAlerts.CREATION_TIME, currentTime);
         values.put(CalendarAlerts.RECEIVED_TIME, 0);
         values.put(CalendarAlerts.NOTIFY_TIME, 0);
         values.put(CalendarAlerts.STATE, CalendarAlerts.STATE_SCHEDULED);
         values.put(CalendarAlerts.MINUTES, minutes);
         return values;
     }

     public static Intent buildEventViewIntent(Context c, long eventId, long begin, long end) {
         Intent i = new Intent(Intent.ACTION_VIEW);
         Uri.Builder builder = CalendarContract.CONTENT_URI.buildUpon();
         builder.appendEncodedPath("events/" + eventId);
         i.setData(builder.build());
         i.setClass(c, EventInfoActivity.class);
         i.putExtra(CalendarContract.EXTRA_EVENT_BEGIN_TIME, begin);
         i.putExtra(CalendarContract.EXTRA_EVENT_END_TIME, end);
         return i;
     }

     public static SharedPreferences getFiredAlertsTable(Context context) {
         return context.getSharedPreferences(ALERTS_SHARED_PREFS_NAME, Context.MODE_PRIVATE);
     }

     private static String getFiredAlertsKey(long eventId, long beginTime,
             long alarmTime) {
         StringBuilder sb = new StringBuilder(KEY_FIRED_ALERT_PREFIX);
         sb.append(eventId);
         sb.append("_");
         sb.append(beginTime);
         sb.append("_");
         sb.append(alarmTime);
         return sb.toString();
     }

     /**
      * Returns whether the SharedPrefs storage indicates we have fired the alert before.
      */
     static boolean hasAlertFiredInSharedPrefs(Context context, long eventId, long beginTime,
             long alarmTime) {
         SharedPreferences prefs = getFiredAlertsTable(context);
         return prefs.contains(getFiredAlertsKey(eventId, beginTime, alarmTime));
     }

     /**
      * Store fired alert info in the SharedPrefs.
      */
     static void setAlertFiredInSharedPrefs(Context context, long eventId, long beginTime,
             long alarmTime) {
         // Store alarm time as the value too so we don't have to parse all the keys to flush
         // old alarms out of the table later.
         SharedPreferences prefs = getFiredAlertsTable(context);
         SharedPreferences.Editor editor = prefs.edit();
         editor.putLong(getFiredAlertsKey(eventId, beginTime, alarmTime), alarmTime);
         editor.apply();
     }

     /**
      * Scans and flushes the internal storage of old alerts.  Looks up the previous flush
      * time in SharedPrefs, and performs the flush if overdue.  Otherwise, no-op.
      */
     static void flushOldAlertsFromInternalStorage(Context context) {
         if (BYPASS_DB) {
             SharedPreferences prefs = getFiredAlertsTable(context);

             // Only flush if it hasn't been done in a while.
             long nowTime = System.currentTimeMillis();
             long lastFlushTimeMs = prefs.getLong(KEY_LAST_FLUSH_TIME_MS, 0);
             if (nowTime - lastFlushTimeMs > FLUSH_INTERVAL_MS) {
                 if (DEBUG) {
                     Log.d(TAG, "Flushing old alerts from shared prefs table");
                 }

                 // Scan through all fired alert entries, removing old ones.
                 SharedPreferences.Editor editor = prefs.edit();
                 Time timeObj = new Time();
                 for (Map.Entry<String, ?> entry : prefs.getAll().entrySet()) {
                     String key = entry.getKey();
                     Object value = entry.getValue();
                     if (key.startsWith(KEY_FIRED_ALERT_PREFIX)) {
                         long alertTime;
                         if (value instanceof Long) {
                             alertTime = (Long) value;
                         } else {
                             // Should never occur.
                             Log.e(TAG,"SharedPrefs key " + key + " did not have Long value: " +
                                     value);
                             continue;
                         }

                         if (nowTime - alertTime >= FLUSH_INTERVAL_MS) {
                             editor.remove(key);
                             if (DEBUG) {
                                 int ageInDays = getIntervalInDays(alertTime, nowTime, timeObj);
                                 Log.d(TAG, "SharedPrefs key " + key + ": removed (" + ageInDays +
                                         " days old)");
                             }
                         } else {
                             if (DEBUG) {
                                 int ageInDays = getIntervalInDays(alertTime, nowTime, timeObj);
                                 Log.d(TAG, "SharedPrefs key " + key + ": keep (" + ageInDays +
                                         " days old)");
                             }
                         }
                     }
                 }
                 editor.putLong(KEY_LAST_FLUSH_TIME_MS, nowTime);
                 editor.apply();
             }
         }
     }

     private static int getIntervalInDays(long startMillis, long endMillis, Time timeObj) {
         timeObj.set(startMillis);
         int startDay = Time.getJulianDay(startMillis, timeObj.gmtoff);
         timeObj.set(endMillis);
         return Time.getJulianDay(endMillis, timeObj.gmtoff) - startDay;
     }
 }
	/*
	* Copyright (C) 2012 The Android Open Source Project
	*
	* Licensed under the Apache License, Version 2.0 (the "License");
	* you may not use this file except in compliance with the License.
	* You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License
	*/

	package com.android.calendar.alerts;

	import android.app.AlarmManager;
	import android.app.PendingIntent;
	import android.content.ContentUris;
	import android.content.ContentValues;
	import android.content.Context;
	import android.content.Intent;
	import android.content.SharedPreferences;
	import android.net.Uri;
	import android.provider.CalendarContract;
	import android.provider.CalendarContract.CalendarAlerts;
	import android.text.TextUtils;
	import android.text.format.DateFormat;
	import android.text.format.DateUtils;
	import android.text.format.Time;
	import android.util.Log;

	import com.android.calendar.EventInfoActivity;
	import com.android.calendar.R;
	import com.android.calendar.Utils;

	import java.util.Locale;
	import java.util.Map;
	import java.util.TimeZone;

	public class AlertUtils {
	private static final String TAG = "AlertUtils";
	static final boolean DEBUG = true;

	public static final long SNOOZE_DELAY = 5 * 60 * 1000L;

	// We use one notification id for the expired events notification. All
	// other notifications (the 'active' future/concurrent ones) use a unique ID.
	public static final int EXPIRED_GROUP_NOTIFICATION_ID = 0;

	public static final String EVENT_ID_KEY = "eventid";
	public static final String SHOW_EVENT_KEY = "showevent";
	public static final String EVENT_START_KEY = "eventstart";
	public static final String EVENT_END_KEY = "eventend";
	public static final String NOTIFICATION_ID_KEY = "notificationid";
	public static final String EVENT_IDS_KEY = "eventids";
	public static final String EVENT_STARTS_KEY = "starts";

	// A flag for using local storage to save alert state instead of the alerts DB table.
	// This allows the unbundled app to run alongside other calendar apps without eating
	// alerts from other apps.
	static boolean BYPASS_DB = true;

	// SharedPrefs table name for storing fired alerts. This prevents other installed
	// Calendar apps from eating the alerts.
	private static final String ALERTS_SHARED_PREFS_NAME = "calendar_alerts";

	// Keyname prefix for the alerts data in SharedPrefs. The key will contain a combo
	// of event ID, begin time, and alarm time. The value will be the fired time.
	private static final String KEY_FIRED_ALERT_PREFIX = "preference_alert_";

	// The last time the SharedPrefs was scanned and flushed of old alerts data.
	private static final String KEY_LAST_FLUSH_TIME_MS = "preference_flushTimeMs";

	// The # of days to save alert states in the shared prefs table, before flushing. This
	// can be any value, since AlertService will also check for a recent alertTime before
	// ringing the alert.
	private static final int FLUSH_INTERVAL_DAYS = 1;
	private static final int FLUSH_INTERVAL_MS = FLUSH_INTERVAL_DAYS * 24 * 60 * 60 * 1000;

	/**
	* Creates an AlarmManagerInterface that wraps a real AlarmManager. The alarm code
	* was abstracted to an interface to make it testable.
	*/
	public static AlarmManagerInterface createAlarmManager(Context context) {
	final AlarmManager mgr = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
	return new AlarmManagerInterface() {
	@Override
	public void set(int type, long triggerAtMillis, PendingIntent operation) {
	mgr.set(type, triggerAtMillis, operation);
	}
	};
	}

	/**
	* Schedules an alarm intent with the system AlarmManager that will notify
	* listeners when a reminder should be fired. The provider will keep
	* scheduled reminders up to date but apps may use this to implement snooze
	* functionality without modifying the reminders table. Scheduled alarms
	* will generate an intent using AlertReceiver.EVENT_REMINDER_APP_ACTION.
	*
	* @param context A context for referencing system resources
	* @param manager The AlarmManager to use or null
	* @param alarmTime The time to fire the intent in UTC millis since epoch
	*/
	public static void scheduleAlarm(Context context, AlarmManagerInterface manager,
	long alarmTime) {
	scheduleAlarmHelper(context, manager, alarmTime, false);
	}

	/**
	* Schedules the next alarm to silently refresh the notifications. Note that if there
	* is a pending silent refresh alarm, it will be replaced with this one.
	*/
	static void scheduleNextNotificationRefresh(Context context, AlarmManagerInterface manager,
	long alarmTime) {
	scheduleAlarmHelper(context, manager, alarmTime, true);
	}

	private static void scheduleAlarmHelper(Context context, AlarmManagerInterface manager,
	long alarmTime, boolean quietUpdate) {
	int alarmType = AlarmManager.RTC_WAKEUP;
	Intent intent = new Intent(AlertReceiver.EVENT_REMINDER_APP_ACTION);
	intent.setClass(context, AlertReceiver.class);
	if (quietUpdate) {
	alarmType = AlarmManager.RTC;
	} else {
	// Set data field so we get a unique PendingIntent instance per alarm or else alarms
	// may be dropped.
	Uri.Builder builder = CalendarAlerts.CONTENT_URI.buildUpon();
	ContentUris.appendId(builder, alarmTime);
	intent.setData(builder.build());
	}

	intent.putExtra(CalendarContract.CalendarAlerts.ALARM_TIME, alarmTime);
	PendingIntent pi = PendingIntent.getBroadcast(context, 0, intent,
	PendingIntent.FLAG_UPDATE_CURRENT);
	manager.set(alarmType, alarmTime, pi);
	}

	/**
	* Format the second line which shows time and location for single alert or the
	* number of events for multiple alerts
	* 1) Show time only for non-all day events
	* 2) No date for today
	* 3) Show "tomorrow" for tomorrow
	* 4) Show date for days beyond that
	*/
	static String formatTimeLocation(Context context, long startMillis, boolean allDay,
	String location) {
	String tz = Utils.getTimeZone(context, null);
	Time time = new Time(tz);
	time.setToNow();
	int today = Time.getJulianDay(time.toMillis(false), time.gmtoff);
	time.set(startMillis);
	int eventDay = Time.getJulianDay(time.toMillis(false), allDay ? 0 : time.gmtoff);

	int flags = DateUtils.FORMAT_ABBREV_ALL;
	if (!allDay) {
	flags \|= DateUtils.FORMAT_SHOW_TIME;
	if (DateFormat.is24HourFormat(context)) {
	flags \|= DateUtils.FORMAT_24HOUR;
	}
	} else {
	flags \|= DateUtils.FORMAT_UTC;
	}

	if (eventDay < today \|\| eventDay > today + 1) {
	flags \|= DateUtils.FORMAT_SHOW_DATE;
	}

	StringBuilder sb = new StringBuilder(Utils.formatDateRange(context, startMillis,
	startMillis, flags));

	if (!allDay && tz != Time.getCurrentTimezone()) {
	// Assumes time was set to the current tz
	time.set(startMillis);
	boolean isDST = time.isDst != 0;
	sb.append(" ").append(TimeZone.getTimeZone(tz).getDisplayName(
	isDST, TimeZone.SHORT, Locale.getDefault()));
	}

	if (eventDay == today + 1) {
	// Tomorrow
	sb.append(", ");
	sb.append(context.getString(R.string.tomorrow));
	}

	String loc;
	if (location != null && !TextUtils.isEmpty(loc = location.trim())) {
	sb.append(", ");
	sb.append(loc);
	}
	return sb.toString();
	}

	public static ContentValues makeContentValues(long eventId, long begin, long end,
	long alarmTime, int minutes) {
	ContentValues values = new ContentValues();
	values.put(CalendarAlerts.EVENT_ID, eventId);
	values.put(CalendarAlerts.BEGIN, begin);
	values.put(CalendarAlerts.END, end);
	values.put(CalendarAlerts.ALARM_TIME, alarmTime);
	long currentTime = System.currentTimeMillis();
	values.put(CalendarAlerts.CREATION_TIME, currentTime);
	values.put(CalendarAlerts.RECEIVED_TIME, 0);
	values.put(CalendarAlerts.NOTIFY_TIME, 0);
	values.put(CalendarAlerts.STATE, CalendarAlerts.STATE_SCHEDULED);
	values.put(CalendarAlerts.MINUTES, minutes);
	return values;
	}

	public static Intent buildEventViewIntent(Context c, long eventId, long begin, long end) {
	Intent i = new Intent(Intent.ACTION_VIEW);
	Uri.Builder builder = CalendarContract.CONTENT_URI.buildUpon();
	builder.appendEncodedPath("events/" + eventId);
	i.setData(builder.build());
	i.setClass(c, EventInfoActivity.class);
	i.putExtra(CalendarContract.EXTRA_EVENT_BEGIN_TIME, begin);
	i.putExtra(CalendarContract.EXTRA_EVENT_END_TIME, end);
	return i;
	}

	public static SharedPreferences getFiredAlertsTable(Context context) {
	return context.getSharedPreferences(ALERTS_SHARED_PREFS_NAME, Context.MODE_PRIVATE);
	}

	private static String getFiredAlertsKey(long eventId, long beginTime,
	long alarmTime) {
	StringBuilder sb = new StringBuilder(KEY_FIRED_ALERT_PREFIX);
	sb.append(eventId);
	sb.append("_");
	sb.append(beginTime);
	sb.append("_");
	sb.append(alarmTime);
	return sb.toString();
	}

	/**
	* Returns whether the SharedPrefs storage indicates we have fired the alert before.
	*/
	static boolean hasAlertFiredInSharedPrefs(Context context, long eventId, long beginTime,
	long alarmTime) {
	SharedPreferences prefs = getFiredAlertsTable(context);
	return prefs.contains(getFiredAlertsKey(eventId, beginTime, alarmTime));
	}

	/**
	* Store fired alert info in the SharedPrefs.
	*/
	static void setAlertFiredInSharedPrefs(Context context, long eventId, long beginTime,
	long alarmTime) {
	// Store alarm time as the value too so we don't have to parse all the keys to flush
	// old alarms out of the table later.
	SharedPreferences prefs = getFiredAlertsTable(context);
	SharedPreferences.Editor editor = prefs.edit();
	editor.putLong(getFiredAlertsKey(eventId, beginTime, alarmTime), alarmTime);
	editor.apply();
	}

	/**
	* Scans and flushes the internal storage of old alerts. Looks up the previous flush
	* time in SharedPrefs, and performs the flush if overdue. Otherwise, no-op.
	*/
	static void flushOldAlertsFromInternalStorage(Context context) {
	if (BYPASS_DB) {
	SharedPreferences prefs = getFiredAlertsTable(context);

	// Only flush if it hasn't been done in a while.
	long nowTime = System.currentTimeMillis();
	long lastFlushTimeMs = prefs.getLong(KEY_LAST_FLUSH_TIME_MS, 0);
	if (nowTime - lastFlushTimeMs > FLUSH_INTERVAL_MS) {
	if (DEBUG) {
	Log.d(TAG, "Flushing old alerts from shared prefs table");
	}

	// Scan through all fired alert entries, removing old ones.
	SharedPreferences.Editor editor = prefs.edit();
	Time timeObj = new Time();
	for (Map.Entry<String, ?> entry : prefs.getAll().entrySet()) {
	String key = entry.getKey();
	Object value = entry.getValue();
	if (key.startsWith(KEY_FIRED_ALERT_PREFIX)) {
	long alertTime;
	if (value instanceof Long) {
	alertTime = (Long) value;
	} else {
	// Should never occur.
	Log.e(TAG,"SharedPrefs key " + key + " did not have Long value: " +
	value);
	continue;
	}

	if (nowTime - alertTime >= FLUSH_INTERVAL_MS) {
	editor.remove(key);
	if (DEBUG) {
	int ageInDays = getIntervalInDays(alertTime, nowTime, timeObj);
	Log.d(TAG, "SharedPrefs key " + key + ": removed (" + ageInDays +
	" days old)");
	}
	} else {
	if (DEBUG) {
	int ageInDays = getIntervalInDays(alertTime, nowTime, timeObj);
	Log.d(TAG, "SharedPrefs key " + key + ": keep (" + ageInDays +
	" days old)");
	}
	}
	}
	}
	editor.putLong(KEY_LAST_FLUSH_TIME_MS, nowTime);
	editor.apply();
	}
	}
	}

	private static int getIntervalInDays(long startMillis, long endMillis, Time timeObj) {
	timeObj.set(startMillis);
	int startDay = Time.getJulianDay(startMillis, timeObj.gmtoff);
	timeObj.set(endMillis);
	return Time.getJulianDay(endMillis, timeObj.gmtoff) - startDay;
	}
	}