Java Hour getAlarmOnQuarterHour()

Description

Setup to find out when the quarter-hour changes (e.g.

License

Apache License

Declaration

public static long getAlarmOnQuarterHour() 

Method Source Code

//package com.java2s;
/*//  w  w w  . j av a  2s.c o m
 * 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.
 */

import java.util.Calendar;

public class Main {
    /** Setup to find out when the quarter-hour changes (e.g. Kathmandu is GMT+5:45) **/
    public static long getAlarmOnQuarterHour() {
        Calendar nextQuarter = Calendar.getInstance();
        //  Set 1 second to ensure quarter-hour threshold passed.
        nextQuarter.set(Calendar.SECOND, 1);
        nextQuarter.set(Calendar.MILLISECOND, 0);
        int minute = nextQuarter.get(Calendar.MINUTE);
        nextQuarter.add(Calendar.MINUTE, 15 - (minute % 15));
        long alarmOnQuarterHour = nextQuarter.getTimeInMillis();
        long now = System.currentTimeMillis();
        long delta = alarmOnQuarterHour - now;
        if (0 >= delta || delta > 901000) {
            // Something went wrong in the calculation, schedule something that is
            // about 15 minutes. Next time , it will align with the 15 minutes border.
            alarmOnQuarterHour = now + 901000;
        }
        return alarmOnQuarterHour;
    }
}

Related

1. convertHour(Long createAt)
2. delayBeforeNextHour()
3. get24Hour()
4. getAnHourBack()
5. getBeforeOneHour()
6. getCalenderWithHour(int hours)
7. getCurrentHour()