How to use Android AlarmManager with small intervals like 1 minute?

Question

I want to make some external service monitor and be notified on problems as fast as possible.

I tried to set up AlarmManager with 1-2 minutes interval,

Answer 1

Calendar cal = Calendar.getInstance();
            cal.add(Calendar.SECOND, 30);
            Intent intent = new Intent(MainActivity.this, YourClass.class);
            PendingIntent pintent = PendingIntent.getService(MainActivity.this,
                    0, intent, 0);
            AlarmManager alarm = (AlarmManager) getSystemService(Context.ALARM_SERVICE);
            alarm.setRepeating(AlarmManager.RTC_WAKEUP, cal.getTimeInMillis(),
                    60* 1000, pintent);