Android Work Manager: How to enqueue Jobs once a month

问题

following this question, I looked into Android Job Scheduling and it seems like Work Manager is the latest tool if I want to do something once every month. I built a Worker class and activated it with this snippet in my activity:

PeriodicWorkRequest myWorkRequest =
                new PeriodicWorkRequest.Builder(MonthlyWorker.class, 20, TimeUnit.MINUTES)
                        .build();
WorkManager.getInstance().enqueueUniquePeriodicWork("my fancy test",ExistingPeriodicWorkPolicy.KEEP, myWorkRequest);

While i tested the 20 minutes period successfully, there is a problem: There are no TimeUnits for months available, only days. Doing the job every 30 days wont work for obvious reasons, since I need the task to be executed on the first day of each month. So what should i do? Do I have to use a different API? Thank you.

I could do something like if (dayOfMonth==1) do Function, but I think that undermines the purpose of a scheduler.

回答1:

You can do by minutes itself:

Just convert days to minutes:

Here : 30 days = 43200 minutes = 1 month

PeriodicWorkRequest myWorkRequest =
            new PeriodicWorkRequest.Builder(MonthlyWorker.class, 43200, TimeUnit.MINUTES)
                    .build();
WorkManager.getInstance().enqueueUniquePeriodicWork("my fancy test",ExistingPeriodicWorkPolicy.KEEP, myWorkRequest);

UPDATE:

As per my requirement, I wanted to perform task every 30 minutes in between 8 am to 6 pm

With help of that worker I made for you as you required 1st of every month in between 12 am to 2 am below:

public class TestWorker extends Worker {

    private static final String DEFAULT_START_TIME = "00:01"; //12:01 am
    private static final String DEFAULT_END_TIME = "03:00"; // 03:00 am

    private static final String TAG = "TestWorker";

    public TestWorker(@NonNull Context context, @NonNull WorkerParameters workerParams) {
        super(context, workerParams);
    }

    @NonNull
    @Override
    public Result doWork() {

        /**
         * Its for time
         */
        DateFormat dateFormat = new SimpleDateFormat("HH:mm", Locale.getDefault());

        /**
         * Get Current Calendar Instance
         */
        Calendar c = Calendar.getInstance();

        // Get current day of month
        int day = c.get(Calendar.DAY_OF_MONTH);

        /**
         * Get current time and compare with our start and end date.
         */
        Date date = c.getTime();
        String formattedDate = dateFormat.format(date);

        try {
            Date currentDate = dateFormat.parse(formattedDate);
            Date startDate = dateFormat.parse(DEFAULT_START_TIME);
            Date endDate = dateFormat.parse(DEFAULT_END_TIME);

            /**
             * This condition will check that day is 1, and time interval in between give time.
             */         
            if (day == 1 && currentDate.after(startDate) && currentDate.before(endDate)) {
                // Do your work here
            }
        } catch (ParseException ignored) {

        }

        return Result.success();
    }
}

You can start this test work for X hour interval so it will check every X hour (for example, In your case you can give 2 hours so it will check every two hours)

I do not know whether it will be affected to performance or not, but I think there is no other solution.

You can start worker as below:

PeriodicWorkRequest periodicWork = new PeriodicWorkRequest.Builder(MyWorker.class, 2, TimeUnit.HOURS)
                .addTag("MYWORK")
                .build();

WorkManager.getInstance().enqueueUniquePeriodicWork("MYWORK", ExistingPeriodicWorkPolicy.REPLACE, periodicWork);

Hope it will help.

来源：https://stackoverflow.com/questions/53901179/android-work-manager-how-to-enqueue-jobs-once-a-month

标签

android

android-workmanager

periodic-task

timeunit