Question

我的应用程序在使用TimePicker指定的特定时间设置警报（24小时模式）。

我注意到，如果时间是23:00并且您设置了01:00的警报，AlarmManager将其解释为已经过去的日期。目前，我设置了如下警报：

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();
}

正如您所看到的，该应用会计算时差，如果它为负，则会设置第二天的闹钟。这会产生上述错误。如何解决？

此致

马库斯

Answer 1

我遇到了同样的问题，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，而不是过去的日期或未来的日期，则意味着他希望在24小时后触发警报：

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

如果我想管理好几天怎么办？这样做

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

然后将天数转换为数小时

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

同时改变你的：

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

为：

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

你的：

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

要：

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

Answer 2

只是一张纸条......

如果您使用的不是RTC_WAKEUP或RTC，则无法使用System.currentTimeMillis()。

例如 ELAPSED_TIME 使用SystemClock.elapsedRealtime()

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

Android AlarmManager为第二天设置闹钟

2 个答案: