Periodic Work Request not executing doWork in Work Manager

Question

I'm trying to get data from a remote url periodically using PeriodicWorkRequest in WorkManager. I have implemented the logic, the issue here is that i don't get any response from the Worker.

However it seems to call doWork() at first launch, but it doesn't get data from the network call. I am surprised that when i use OneTimeWorkRequest i get a success result from doWork() and the data from server as well.

what could i be doing wrong?

code below:

Worker Class

public class WorkerClass extends Worker {

private Context context;
public static final String EXTRA_WORKER_CLASS = "extra_tag";

public SpecialOffer(@NonNull Context context, @NonNull WorkerParameters workerParams) {
    super(context, workerParams);
    this.context = context;
}

@NonNull
@Override
public Result doWork() {
    Log.d("WORKER_PERIOD", "started");
    String url = "https://sampleurl/get.php";
    //Volley synchronous call
    RequestFuture<String> future = RequestFuture.newFuture();
    StringRequest request = new StringRequest(url, future, future);
    MySingleton.getInstance(context).addToRequestQueue(request);

    try {
        String response = future.get();
        Data data = new Data.Builder()
                .putString(EXTRA_SPECIAL_CARS, response)
                .build();
        setOutputData(data);
        Log.d("WORKER_RESPONSE", response);
        return Result.SUCCESS;
    } catch (InterruptedException | ExecutionException e) {
        return Result.FAILURE;
    }
}
}

Method to call task

public void callTask(){
     PeriodicWorkRequest periodicRequest =
                new PeriodicWorkRequest.Builder(WorkerClass.class, 15, TimeUnit.MINUTES)
                        .setConstraints(constraints)
                        .addTag("SPECIAL_OFFER")
                        .build();

        workManager.enqueueUniquePeriodicWork("SPECIAL_OFFER",
                ExistingPeriodicWorkPolicy.KEEP, periodicRequest);

        workManager.getWorkInfoByIdLiveData(periodicRequest.getId())
                .observe(getActivity(), workInfo -> {
                    Log.d("WORKER_PERIOD", "observed");
                    // Do something with the status
                    if (workInfo != null && workInfo.getState().isFinished()) {
                        Log.d("WORKER_PERIOD", "observed");
                        String ava = workInfo.getOutputData().getString(SpecialOffer.EXTRA_SPECIAL_CARS);
                        if (ava.equals("available")) {
                            showSpecialOffer(true);
                        } else {
                            showSpecialOffer(true);
                        }
                    }
                });
}

Answer 1

According to the PeriodicWorkRequest Documentation

The normal lifecycle of a PeriodicWorkRequest is ENQUEUED -> RUNNING -> ENQUEUED. By definition, periodic work cannot terminate in a succeeded or failed state, since it must recur. It can only terminate if explicitly cancelled

So when you doworkInfo.getState().isFinished() in .observe it always returns false because .isFinished() method documentation says:

returns true for SUCCEEDED, FAILED, and * CANCELLED states