AlarmManager不会触发我的服务

Question

I set my AlarmManager like below:

Intent startIntent =  new Intent(context, MyService.class);
PendingIntent pendingIntent = PendingIntent.getService(context, 0, startIntent, 0);
alarmManager.set(AlarmManager.RTC_WAKEUP, System.currentTimeMillis() + 3000, pendingIntent);
Log.d(TAG, "Current time is " + System.currentTimeMillis());
Log.d(TAG, "Next alarm time is: " + (alarmManager.getNextAlarmClock().getTriggerTime() - System.currentTimeMillis()));

It shows
Current time is 1499909678520
Next alarm time is: 55521479

I thought RTC is UTC time using the System.currentTimeMillis(). Should next alarm be a number less than 3000?

FYI, in my service, I handle it like this:

@Override
public int onStartCommand(Intent intent, int flags, int startId) {
  Log.i(TAG, "MyService started");
}

My service never starts. What's going wrong?

Answer 1

For repeating alarm use:

// Alarm time :: Current time
Calendar calendar = Calendar.getInstance() ;
calendar.setTimeInMillis(System.currentTimeMillis());
calendar.set(Calendar.SECOND, 0);

// Interval
long interval = 3000; // 3 seconds

alarmManager.setRepeating(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), interval, pendingIntent);

Instead of:

alarmManager.set(AlarmManager.RTC_WAKEUP, System.currentTimeMillis() + 3000, pendingIntent);

Make sure you have declared MyService in AndroidManifest.xml .

Answer 2

I made a stupid mistake in showing logs. So, my code actually works. But, I guess alarmManager.getNextAlarmClock().getTriggerTime() doesn't return in UTC which causing the difference to System.currentTimeMills().