IssueTracker

We introduced a regression in beta02. Can you try using beta01 instead ?

Also, beta03 is coming with a fix very soon.

Thank you for your prompt response. I've checked the functioning of OneTimeWorkRequest in beta01 and it works as expected. Looking forward to beta03 for the fix.

beta03 is out.

In beta03, the bug seems fixed when JobScheduler backend is used.
But the bug seems to remain when AlarmManager backend is used.

The following step-by-step fails for me on emulator "Nexus 7 (2012) API 22", but passes on emulator "Pixel 2 XL API 27".

STEP BY STEP:
1. Create a "Hello world" Android app using Android Studio wizard and add implementation("android.arch.work:work-runtime:1.0.0-beta03") to dependencies
2. Add the following to MainActivity.onCreate():

        final String name = Long.toString(System.currentTimeMillis()); // To ensure fresh name each run
        final OneTimeWorkRequest workRequest = new OneTimeWorkRequest.Builder(LogPrinter.class)
                .setBackoffCriteria(BackoffPolicy.LINEAR, WorkRequest.MIN_BACKOFF_MILLIS, TimeUnit.MILLISECONDS)
                .addTag(name)
                .build();
        Log.e("Repro", "Calling enqueueUniqueWork(" + name + ", ...)");
        WorkManager.getInstance().enqueueUniqueWork(name, ExistingWorkPolicy.REPLACE, workRequest);

where LogPrinter.class doWork() is:

    @NonNull
    @Override
    public Result doWork() {
        Log.e("Repro", "doWork() called. Now swipe away app in App Switcher. Tags: " + getTags());
        SystemClock.sleep(10000);
        Log.e("Repro", "Too late, try again. Tags: " + getTags());
        return Result.success();
    }

3. Run the app and check adb logcat -s Repro
4. When you see "Now swipe away app in App Switcher", do that.

EXPECTED:
You should see "doWork() called ..." again after max 10 seconds (due to specified backoff time), since the WorkManager framework should ensure that the Worker that never was finished gets a chance to run again.

ACTUAL:
On API 22, you never see "doWork() called ..." again (Test fails).
On API 27, you do see "doWork() called ..." again (Test pass).

Let me know if you need more input.

Best regards,
Martin Nordholts

When a swipe to dismiss happens you should see a message in logcat which looks like:

W/ActivityManager( 1532): Scheduling restart of crashed service androidx.work.integration.testapp/androidx.work.impl.background.systemalarm.SystemAlarmService in 47470ms

Service crashes are different from Worker retries or backoffs. So you won't see it in 10 seconds. It might take longer. Look at the logs for more info.

Thanks for the tip, this helped me debug this further.

Turns out that if you see "Scheduling restart of crashed service", then yes, doWork() will be called after the specified time.
But the problem is that SystemAlarmService is not always scheduled to restart, because SystemAlarmService is not always running when the app is closed.
In fact, it seems to be quite rare for SystemAlarmService to run.

If you increase the sleep from 10000 to 20000 in my step-by-step instructions, and let 10 seconds pass between ""doWork() called .., " being logged and you closing the app, I think you'll be able to reproduce the problem, namely that doWork() never becomes called again (since SystemAlarmService is not scheduled for a restart, since it wasn't running when the app was closed).

Are you able to reproduce the problem with these extra instructions?