将初始延迟设置为Android中的周期性工作管理器 [英] Set initial delay to a Periodic Work Manager in Android

问题描述

我有一个Worker实例，它需要每24小时运行一次，考虑到PeriodicWorkRequest API，这非常简单.但这是要抓住的地方.

I have a Worker instance that needs to run every 24 hours which is pretty simple considering the PeriodicWorkRequest API. But here's the catch.

如果用户在晚上8点开始工作，那么我需要工作管理器的第一个实例在第二天早上9点运行，然后遵循24小时定期限制.

If the user initiates the work at say 8 PM, I need the first instance of the work manager to run at 9 AM the next morning and then follow the 24-hour periodic constraint.

我在此处发现OneTimeWorkRequest API具有可以使用的setInitialDelay()函数，但是我找不到PeriodicWork API的任何内容.

I looked hereand I found that the OneTimeWorkRequest API has a setInitialDelay() function that can be used but I wasn't able to find anything for the PeriodicWork API.

还有一些技巧，例如我可以在初始延迟时使用OneTimeWork，然后从那里安排PeriodicWork，但这有点脏.

Ther are some hacks for this such as I can use the OneTimeWork with the initial delay and then schedule a PeriodicWork from there but it's kinda a dirty hack.

仅使用PeriodicWorkRequest API有没有办法做到这一点?

Is there any way to do this with just the PeriodicWorkRequest API?

推荐答案

在新版本的工作管理器上(

On the new version of Work manager (Version 2.1.0-alpha02 released on May 16, 2019) PeriodicWorkRequests now support initial delays. You can use the setInitialDelay method on PeriodicWorkRequest.Builder to set an initial delay.

示例:

    PeriodicWorkRequest workRequest = new PeriodicWorkRequest.Builder(
        WorkerReminderPeriodic.class,
        24,
        TimeUnit.HOURS,
        PeriodicWorkRequest.MIN_PERIODIC_FLEX_MILLIS,
        TimeUnit.MILLISECONDS)
      .setInitialDelay(1, TimeUnit.HOURS)
      .addTag("send_reminder_periodic")
      .build();


    WorkManager.getInstance()
        .enqueueUniquePeriodicWork("send_reminder_periodic", ExistingPeriodicWorkPolicy.REPLACE, workRequest);

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