I have encountered a problem where when I set a time, there is a delay for the alarm to ring. Sometimes the alarm goes off early too. I am not sure where I did wrong. Hope someone can help me with this problem.
public void showHourPicker(View view) {
currentHour = calendar.get(Calendar.HOUR_OF_DAY);
currentMinute = calendar.get(Calendar.MINUTE);
timePickerDialog = new TimePickerDialog(MainActivity.this, android.R.style.Theme_Holo_Light_Dialog_NoActionBar, new TimePickerDialog.OnTimeSetListener() {
@Override
public void onTimeSet(TimePicker timePicker, int hourOfDay, int minutes) {
if (hourOfDay >= 12) {
amPm = "PM";
} else {
amPm = "AM";
}
txtTime.setText(String.format("%02d:%02d ", hourOfDay, minutes) + amPm);
calendar.set(Calendar.HOUR_OF_DAY,hourOfDay);
calendar.set(Calendar.MINUTE,minutes);
}
}, currentHour, currentMinute, false);
timePickerDialog.setTitle(" Your Expected Time : " + exp.getText());
timePickerDialog.getWindow().setBackgroundDrawableResource(android.R.color.transparent);
timePickerDialog.show();
startAlarm(calendar);
}
public void startAlarm(Calendar calendar) {
AlarmManager alarmManager = (AlarmManager) getSystemService(Context.ALARM_SERVICE);
Intent intent = new Intent(this, MyBroadcastReceiver.class);
PendingIntent pendingIntent = PendingIntent.getBroadcast(this, 0, intent, 0);
alarmManager.setRepeating(AlarmManager.RTC_WAKEUP,calendar.getTimeInMillis(),AlarmManager.INTERVAL_DAY,pendingIntent);
}
This is intended behavior as described in AlarmManager.setRepeating:
As of API 19, all repeating alarms are inexact. If your application needs precise delivery times then it must use one-time exact alarms, rescheduling each time as described above.