Why is Android Worker finishing successfully and calling onStopped()

Question

My current Android app employs androidx.work:work-runtime:2.2.0-rc01

My Worker code resembles this:-

class SyncWorker(context: Context,          


        

Answer 1

I've created a simple example: it just starts the SyncWorker you are provided when a button is clicked. No sequential workers are started, just one worker, I even simplified the worker creation:

val refreshDatabaseWork: OneTimeWorkRequest = OneTimeWorkRequest.Builder(SyncWorker::class.java)
    .build()

WorkManager
    .getInstance(application)
    .enqueue(refreshDatabaseWork)

When I press the button, sometimes the onStopped() is called, sometimes isn't. It's called very rarely, about one time per 20 clicks. Such inconsistent behavior looks like a bug indeed. There is onExecuted() callback method in the Processor implementation that is called each time when the worker finishes:

@Override
public void onExecuted(
    @NonNull final String workSpecId,
    boolean needsReschedule
) {
    synchronized (mLock) {
        mEnqueuedWorkMap.remove(workSpecId);
        Logger.get().debug(TAG, String.format("%s %s executed; reschedule = %s",
                getClass().getSimpleName(), workSpecId, needsReschedule));

        for (ExecutionListener executionListener : mOuterListeners) {
            executionListener.onExecuted(workSpecId, needsReschedule);
        }
    }
}

This method removes the worker wrapper from mEnqueuedWorkMap, but sometimes stopWork() method gets the wrapper before it's removed, and as a result the worker is stopped and onStopped() callback is called.

Also I've noticed that wrapper.interrupt(false) call receives cancelled boolean flag which is false in our case, but the flag is never used by the method, it also looks strange.

I've also tried androidx.work:work-runtime:2.2.0, which is now available, but the result is the same. I think it's better to create a google issue to get an answer from the library developers. The behavior looks very strange, but I can only guess what it's intended to be.