安卓：减去分钟，我的闹钟 [英] Android: Subtract minutes to my alarm

问题描述

我做的警报，获取当前时间如下：

I'm making an alarm, get the current time as follows:

public String getAlarmTimeStringFive2db() {

        String timef2db = "";
        if (alarmTime.get(Calendar.HOUR_OF_DAY) <= 9)
            timef2db += "0";
        timef2db += String.valueOf(alarmTime.get(Calendar.HOUR_OF_DAY));
        timef2db += ":";

        if (alarmTime.get(Calendar.MINUTE) <= 9)
            timef2db += "0";
        timef2db += String.valueOf(alarmTime.get(Calendar.MINUTE));

        return timef2db;

    }

...

public static long create(Alarm alarm) {
        ContentValues cv = new ContentValues();
        cv.put(COLUMN_ALARM_ACTIVE, alarm.getAlarmActive());
        cv.put(COLUMN_ALARM_TIME, alarm.getAlarmTimeStringFive2db());

...

public void setAlarmTime(String alarmTime) {

    String[] timePieces = alarmTime.split(":");

    Calendar newAlarmTime = Calendar.getInstance();
    newAlarmTime.set(Calendar.HOUR_OF_DAY,
            Integer.parseInt(timePieces[0]));
    newAlarmTime.set(Calendar.MINUTE, Integer.parseInt(timePieces[1]));
    newAlarmTime.set(Calendar.SECOND, 0);
    setAlarmTime(newAlarmTime);     
}

...

这工作得很好，例如返回5:35 ......没事了。

This works fine, for example returns 5:35 ... all right.

我的问题是我想在时间总是减去5分钟。如果时间是5:35，我要报警时间开始于5:30。

My problem is I want to subtract 5 minutes always on time. If the time is 5:35, I want the alarm time starts at 5:30.

我的问题是我不知道该怎么减的5分钟。
我试过

My problem is I do not know how to subtract those 5 minutes. I tried

Calendar.MINUTE，的Integer.parseInt（钟表[1]，5）

Calendar.MINUTE, Integer.parseInt(timePieces[1],5)

Calendar.MINUTE，-5）

Calendar.MINUTE, -5)

...但没有任何工程

...but nothing works

我看了这个链接
<一href=\"http://stackoverflow.com/questions/11857251/set-alarm-to-alert-5-minutes-before-a-certian-time\">Set报警，以提醒5分钟certian时间之前
..但我不能把它应用到我的code

I read this link Set Alarm To Alert 5 Minutes Before a certian Time .. but I could not apply it to my code

谁能告诉我，我减去报警5分钟？

Can anyone tell me as subtracting 5 minutes of my alarm?

在此先感谢

问候

推荐答案

我不知道，如果你正在使用正确的方式日历实例，但这里有一个例子显示了当使用添加时间变化-5到当前日历

I'm not sure if you are using the Calendar instance in the right way, but here is an example shows that time changes when use add -5 to the current calendar

Calendar cal = Calendar.getInstance();
    System.out.println("Before :" +  cal.get(Calendar.MINUTE));
    cal.add(Calendar.MINUTE, -5);
    System.out.println("After :" + cal.get(Calendar.MINUTE));

和结果会是这样的：

Before :37 
After :32

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