How to schedule notifications using WorkManager?

Question

I want to schedule a notification everytime the user add a note in the database for a specific time. While there are multiple ways to do it using AlarmManager, BroadcastRece

Answer 1

As ianhanniballake stated

WorkManager isn't appropriate for work that needs to happen at a particular time.

But this can be set in near future of the exact time, depending on the state of the battery optimization.

An workaround will be like:

// Time to show notification at
LocalDateTime timeAt = LocalDate.now().atTime(20, 0);
LocalDateTime timeNow = LocalDateTime.now();

OneTimeWorkRequest.Builder workBuilder = new OneTimeWorkRequest.Builder(NotificationWorker.class);
// I just need to set an delay here
workBuilder.setInitialDelay(Duration.between(timeNow, timeAt));

// This is just to complete the example
WorkManager.getInstance().enqueueUniqueWork(UNIQUE_WORK_SHOW_NOTIFICATION,
                                    ExistingWorkPolicy.REPLACE,
                                    workBuilder.build());