I use Google Calendar Provider for Android to add Events in my Google Calendar: https://developer.android.com/guide/topics/providers/calendar-provider.html#overview
And this is the example to add Reminder for the Event:
ContentValues values = new ContentValues();
values.put(CalendarContract.Reminders.MINUTES, 15);
values.put(CalendarContract.Reminders.EVENT_ID, reminderEventId);
values.put(CalendarContract.Reminders.METHOD, CalendarContract.Reminders.METHOD_ALERT);
getContentResolver().insert(CalendarContract.Reminders.CONTENT_URI, values);
But in my Google Calendar app I can create Reminders without having EVENT_ID. Is it possible to create the same reminders with Google Calendar Provider for Android?
The same like this: https://gsuiteupdates.googleblog.com/2016/04/launch-of-reminders-for-google-calendar.html
I have see that Google launch reminders for Google Calendar 2016 (This is a different Reminders from Event Reminders) and at the moment I can`t find in Android SDK (API 25) this kind of Google Calendar Reminders (and possibility to add programmatically appointment slots too).