Android JobScheduler：如果您使用定期时间安排相同的作业，它是否会再次开始这段时间？

Question

What happens if I schedule the same periodic job (same job ID) and the Job has already been scheduled? Does it start its period again from the beginning?

For example, I call this method twice:

JobInfo myLongJob = new JobInfo.Builder(
            JOB_ID,
            new ComponentName(context, JobSchedulerLongService.class.getName())
    ).setPeriodic(10000)
     .build();

    jobScheduler.schedule(myLongJob);

Does scheduling the job second time cause the periodic timer to start counting again?

Answer 1

I found it after doing some tests:

Does scheduling the job the second time cause the periodic timer to start counting again?

Yes! and...

It will depend on:

• If the job is being executed: Will cause the first job to stop (calling onStopJob method) and start again.
• If the job is not being executed: Will just start again the countdown.

Added really useful comment from @Gauthier:

jobId - int: Application-provided id for this job. Subsequent calls to cancel, or jobs created with the same jobId, will update the pre-existing job with the same id. [link to this doc]( http://developer.android.com/reference/android/app/job/JobInfo.Builder.html#JobInfo.Builder(int , android.content.ComponentName))