Android AlarmManager设置第二天的警报

Question

我有一个应用程序，在指定的时间设置警报与TimePicker（24小时模式）。

我注意到，如果时间是23:00，而您将报警设置为01:00，AlarmManager会将其解释为已过日期。目前，我设置的警报如下所示：

private void setUpAlarm(int hour, int minute){
    long timeInMs = 0;
    long currentTimeInMs = 0;
    long timeDifference = 0;

    // Set up a calendar to calculate when the alarm should go off
    Calendar customCalendar = new GregorianCalendar();
    customCalendar.set(Calendar.HOUR_OF_DAY, hour);
    customCalendar.set(Calendar.MINUTE, minute);
    customCalendar.set(Calendar.SECOND, 0);
    customCalendar.set(Calendar.MILLISECOND, 0);

    Date customDate = customCalendar.getTime();

    timeInMs = customDate.getTime();
    currentTimeInMs = System.currentTimeMillis();
    timeDifference = timeInMs - currentTimeInMs;

    /*
     * If the user has entered a date that has passed (time difference is negative)
     * add 24 hours to the alarm time.
     */
    if(timeDifference < 0){
        timeInMs += 86400000;
    }

    //set the alarm
    Intent intent = new Intent(this, AlarmClockRingRing.class);
    action = PendingIntent.getActivity(this, (int)timeInMs,
            intent, 0); 
    AlarmManager am = (AlarmManager) getSystemService(ALARM_SERVICE);
    am.set(AlarmManager.RTC_WAKEUP, timeInMs, action);
    Toast.makeText(this, "One shot alarm set at " + alarmTime, Toast.LENGTH_LONG).show();
}

正如你所看到的，该应用程序计算时差，如果时差为负值，则设置第二天的警报。这就产生了上面描述的bug。如何修复它？

当做

马库斯

Answer 1

只是一张纸条。。。

如果您使用的不是RTC_WAKEUP或RTC，则不能使用系统。currentTimeMillis（）。

例如，已用时间使用系统时钟。elapsedRealtime（）

https://developer.android.com/reference/android/app/AlarmManager.html#RTC_WAKEUP

Answer 2

不过，我也面临着同样的问题，我设法改变了我的方法，而不是使用

customCalendar.set(Calendar.HOUR_OF_DAY, hour);
customCalendar.set(Calendar.MINUTE, minute);
customCalendar.set(Calendar.SECOND, 0);
customCalendar.set(Calendar.MILLISECOND, 0);

我把它改成了

customCalendar.setTimeInMillis(System.currentTimeMillis());
customCalendar.add(Calendar.HOUR_OF_DAY, diffHours);
customCalendar.add(Calendar.MINUTE, diffMinutes);
customCalendar.set(Calendar.SECOND, 0);
customCalendar.set(Calendar.MILLISECOND, 0);

像这样获取diffHours和diffMinutes

diffHours   = timeDifference / (60 * 60 * 1000) % 24;
diffMinutes = timeDifference / (60 * 1000) % 60;

如果用户选择了相同的当前时间，而不是过去日期或未来日期，这意味着他希望警报在24小时后触发，以便：

if (timeDifference == 0) {
    diffHours = 24;
} 

如果我也想管理好几天呢？这样做

diffDays = timeDifference / (24 * 60 * 60 * 1000);

然后像这样把天转换成小时

if (diffDays != 0) {
    diffHours = diffHours + (diffDays * 24);
}

同时更改您的：

if (timeDifference < 0) {
    timeInMs += 86400000;
}

致：

if (timeDifference < 0) {
    timeDifference += 86400000;
}

还有你的：

am.set(AlarmManager.RTC_WAKEUP, timeInMs, action);

到：

am.set(AlarmManager.RTC_WAKEUP, customCalendar.getTimeInMillis(), action);