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On Application start I want to start service that will work forever, but when user opens app again it duplicates.

PeriodicWorkRequest.Builder sendDataBuilder = new PeriodicWorkRequest.Builder(SendConnectionMetricsWorker.class, Constants.REPEAT_TIME_INTERVAL_IN_HOURS, Constants.REPEAT_TIME_INTERVAL_UNITS)
                .setConstraints(new Constraints.Builder()
                        .setRequiredNetworkType(NetworkType.CONNECTED)
                        .build());
        PeriodicWorkRequest periodicWorkRequest = sendDataBuilder
                .build();
        WorkManager.getInstance().enqueue(periodicWorkRequest);
  
This method allows you to enqueue a uniquely-named
  PeriodicWorkRequest, where only one PeriodicWorkRequest of a
  particular name can be active at a time. For example, you may only
  want one sync operation to be active. If there is one pending, you can
  choose to let it run or replace it with your new work. The
  uniqueWorkName uniquely identifies this PeriodicWorkRequest.
You can achieve it as follows:
PeriodicWorkRequest.Builder sendDataBuilder = new PeriodicWorkRequest.Builder(SendConnectionMetricsWorker.class, Constants.REPEAT_TIME_INTERVAL_IN_HOURS, Constants.REPEAT_TIME_INTERVAL_UNITS)
                .setConstraints(new Constraints.Builder()
                        .setRequiredNetworkType(NetworkType.CONNECTED)
                        .build());
 PeriodicWorkRequest periodicWorkRequest = sendDataBuilder
                .build();
 WorkManager.getInstance().enqueueUniquePeriodicWork("Send Data",  ExistingPeriodicWorkPolicy.KEEP,periodicWorkRequest);
Note:
ExistingPeriodicWorkPolicy.REPLACE ensures that if there is pending work labelled with uniqueWorkName, it will be cancelled and the new work will run. ExistingPeriodicWorkPolicy.KEEP will run the new PeriodicWorkRequest only if there is no pending work labelled with uniqueWorkName.
                enqueueUniquePeriodicWork()? Which version of library do you use? I guess I don't have this method
– Igor Kostenko
                Jun 20, 2018 at 8:15
                @IhorKostenko iam using implementation "android.arch.work:work-runtime:1.0.0-alpha03" . You can refer official document for more details
– Sagar
                Jun 20, 2018 at 8:31
                @Sagar with this new enqueueUniquePeriodicWork we do not need anymore to check the workstatus and observe the liveData event, right?
– Nicolas Jafelle
                Jun 22, 2018 at 14:53
                my "enqueueUniquePeriodicWork" does only work(sync data) a few times. After that it does not sync anymore, even with KEEP or REPLACE policy, no constraints... Any idea?
– Dan Alboteanu
                Apr 22, 2020 at 6:21
        
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