如何为特定的日期，小时，分钟和秒设置警报管理器

Question

闹钟在指定时间不起作用 (20 十二月 2018， 12：10：02(

这段代码有什么问题？

Calendar c = Calendar.getInstance();
c.set(Calendar.MONTH,12);
c.set(Calendar.YEAR,2018);
c.set(Calendar.DAY_OF_MONTH,20);
c.set(Calendar.HOUR_OF_DAY,12);
c.set(Calendar.MINUTE,10);
c.set(Calendar.SECOND,2);
Intent intent = new Intent(ProfileList.this, IntentBroadcastedReceiver.class);
PendingIntent pintent = PendingIntent.getService(ProfileList.this, 0, intent, 0);
AlarmManager alarm = (AlarmManager)getSystemService(Context.ALARM_SERVICE);
alarm.setRepeating(AlarmManager.RTC_WAKEUP, c.getTimeInMillis(), 30*1000, pintent);

Answer 1

改用java.timeapi：

本地日期时间用于表示日期和时间的组合。

import java.time;
LocalDateTime ldt = LocalDateTime.of(2018, Month.DECEMBER, 20, 12, 10);
// or just parse it from string:
LocalDateTime ldt2 = LocalDateTime.parse("2018-12-20T12:10:00");
// after that, you can get millis for your zone this way:
ZonedDateTime zdt = ldt.atZone(ZoneId.of("America/Los_Angeles"));
long currentTimeMillis = zdt.toInstant().toEpochMilli();
//... your code
alarm.setRepeating(AlarmManager.RTC_WAKEUP, currentTimeMillis, 30*1000, pintent);

请参阅此数据库指南： http://www.baeldung.com/java-8-date-time-intro

对于早于 26 的 Android，请使用ThreeTenABP项目，该项目适应了 ThreeTen-Backport项目，该项目将大部分java.time功能向后移植到 Java 6 和 7。

Answer 2

我明白了，月份从 0 开始。 它应该是：

c.set(Calendar.MONTH,11); //December

Answer 3

以下代码对我有用：

// for Alarm 15/09/2018 at 12.00   
Calendar myAlarmDate = Calendar.getInstance();
myAlarmDate.setTimeInMillis(System.currentTimeMillis());
myAlarmDate.set(2012, 09, 15, 12, 00, 0);
AlarmManager alarmManager = (AlarmManager)
context.getSystemService(Context.ALARM_SERVICE);
Intent _myIntent = new Intent(context,AlarmReceiverNotificationForEveryMonth.class);
_myIntent.putExtra("MyMessage","HERE I AM PASSING THEPERTICULAR MESSAGE WHICH SHOULD BE SHOW ON RECEIVER OF ALARM");
PendingIntent _myPendingIntent = PendingIntent.getBroadcast(context, 123, _myIntent,PendingIntent.FLAG_UPDATE_CURRENT);
alarmManager.set(AlarmManager.RTC_WAKEUP, myAlarmDate.getTimeInMillis(),_myPendingIntent);

希望对您有所帮助。