title: My work manager is not working after kill the application
body: <p>My android application doesn't run the workmanager when I killed the application.
  The workmanager stop working when the application process killed.</p>
  
  <p>my code is :</p>
  
  <pre><code>PeriodicWorkRequest workRequest =
                  new PeriodicWorkRequest.Builder(UploadWorker.class, 1, TimeUnit.MINUTES)
                          .setConstraints(constraints)
                          .build();
          WorkManager.getInstance().enqueue(workRequest);
  </code></pre>
  
  <p>and I have also applied <code>Jobscheduler</code> but the program is working when application still alive in the process. but when the application closed the workmanager is not working. I have set the periodic time is <code>1 min</code>.</p>