设置报警android的计算时间差

问题描述

我正在开发一个小闹钟应用程序，我需要一种方法来计算时间差，以便能够区间传递给alarmManager。我看到了很多类似的话题在这里，所以问题是：什么是计算我的目的时差的最佳方法？
我写的方法，以便从timepicker获取时间和计算出的差异，但它是越野车，因为我得到一些疯狂的值，同时测试。

 公众诠释CalculateInterval（）{    / * ---从时间选择器获取目标的时间--- * /
    VG的ViewGroup =（ViewGroup中）tp.getChildAt（0）;
    ViewGroup中数字1 =（ViewGroup中）vg.getChildAt（0）;
    ViewGroup中号码2 =（ViewGroup中）vg.getChildAt（1）;
    串个小时=（（EditText上）number1.getChildAt（1））。gettext的（）
            的ToString（）;
    串分钟=（（的EditText）number2.getChildAt（1））。的getText（）
            的ToString（）;    / * ---转换为整数值以毫秒--- * /
    INT hrsInMillis =的Integer.parseInt（小时）* 3600 * 1000;
    INT mnsInMillis =的Integer.parseInt（分钟）* 60 * 100;    / * ---获得当前的时间（ms）--- * /
    日历C = Calendar.getInstance（）;
    INT secondsInMillis = c.get（Calendar.SECOND）* 1000;
    INT minutesInMillis = c.get（Calendar.MINUTE）* 1000 * 60;
    INT HoursInMillis = c.get（Calendar.HOUR）* 1000 * 3600;    INT电流= secondsInMillis + minutesInMillis + HoursInMillis;    / * ---计算差值--- * /
    INT间隔=（hrsInMillis + mnsInMillis） - 电流;    返回区间;
}
 

解决方案

 日历C = Calendar.getInstance（）;
INT secondsInMillis = c.get（Calendar.SECOND）* 1000;
INT minutesInMillis = c.get（Calendar.MINUTE）* 1000 * 60;
INT HoursInMillis = c.get（Calendar.HOUR）* 1000 * 3600;
 

以上code是有点多余，我猜这就是为什么你越来越疯狂的价值观。相反，获得的长 C值和刚与另一长。

不过，这是一个有点技巧，因为你目前只获得米利斯小时和分钟。

下面就是我想要做的（伪code）：

 设置报警Calendar.getInstance（）
设置alarm.hour到的Integer.parseInt（小时）
alarm.minute设置的Integer.parseInt（分钟）
集alarm.secs为0
如果alarm.before（现）
    加1天报警
万一
设置差异（alarm.getTimeInMillis（） -  now.getTimeInMillis（））
 

I'm developing a small alarm clock app and I need a way to calculate the time difference to be able to pass the interval to the alarmManager. I saw a lot of similar topics around here, so the question is: what is the best way of calculating the time difference for my purpose?I wrote that method to obtain time from the timepicker and calculate the difference but it's buggy since I get some crazy values while testing..

    public int CalculateInterval() {

    /*--- get the target time from the time picker ---*/
    ViewGroup vg = (ViewGroup) tp.getChildAt(0);
    ViewGroup number1 = (ViewGroup) vg.getChildAt(0);
    ViewGroup number2 = (ViewGroup) vg.getChildAt(1);
    String hours = ((EditText) number1.getChildAt(1)).getText()
            .toString();
    String mins = ((EditText) number2.getChildAt(1)).getText()
            .toString();

    /*--- convert to integer values in ms ---*/
    int hrsInMillis = Integer.parseInt(hours) * 3600 * 1000;
    int mnsInMillis = Integer.parseInt(mins) * 60 * 100;

    /*--- obtain the current time in ms ---*/
    Calendar c = Calendar.getInstance();
    int secondsInMillis = c.get(Calendar.SECOND) * 1000;
    int minutesInMillis = c.get(Calendar.MINUTE) * 1000 * 60;
    int HoursInMillis = c.get(Calendar.HOUR) * 1000 * 3600;

    int current = secondsInMillis + minutesInMillis + HoursInMillis;

    /*--- calculate the difference ---*/
    int interval = (hrsInMillis + mnsInMillis) - current;

    return interval;
}

解决方案

Calendar c = Calendar.getInstance();
int secondsInMillis = c.get(Calendar.SECOND) * 1000;
int minutesInMillis = c.get(Calendar.MINUTE) * 1000 * 60;
int HoursInMillis = c.get(Calendar.HOUR) * 1000 * 3600;

The above code is a bit unnecessary, and I would guess this is why you are getting "crazy values". Instead, get the long value from c and just subtract it with another long.

However, this is a bit of a trick since you currently only get the hours and minutes in millis.

Here's what I'd do (pseudocode):

set alarm to Calendar.getInstance()
set alarm.hour to Integer.parseInt(hours)
set alarm.minute to Integer.parseInt(mins)
set alarm.secs to 0
if alarm.before(now)
    add 1 day to alarm
endif
set difference to (alarm.getTimeInMillis() - now.getTimeInMillis())

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