Wish Android Job Scheduler

Peter Simpson · Dec 24, 2017

The title says it all.

A nice and easy way to implement Android Job Scheduler, please see this link https://developer.android.com/about/versions/oreo/background.html#overview.

I have a strange feeling that you're going to say use a notifications to add a icon at the top of the screen to keep the service running

Please note that I personally do not actually need this feature as none of my apps are effected. But I've come across a post and while testing in Android V8.1.0 I realised that there might be an issue in the future that does not effect me right now, phew. Maybe it's something that you already know a logical workaround for (without adding a notification icon to the notification area).

Anyway, it's just a though...

XbNnX_507 · Jan 2, 2018

if you know java then you can make a library https://github.com/evernote/android-job.
Sadly i don't know.
But i'm looking forward to use Android Job Scheduler in B4A.

Peter Simpson · Jan 2, 2018

XbNnX_507 said:
if you know java then you can make a library https://github.com/evernote/android-job.
Sadly i don't know.
But i'm looking forward to use Android Job Scheduler in B4A.

I know a bit of Java, but sadly not enough to create libraries. Every time I look into learning it, a paid project comes in so I just stop

DonManfred · Jan 3, 2018

XbNnX_507 said:
But i'm looking forward to use Android Job Scheduler in B4A.

based on the library code i guess it should be possible to create a wrapper for this...

Peter Simpson said:
but sadly not enough to create libraries

i´ll check this lib today for you, Peter

Peter Simpson · Jan 3, 2018

Hey oh err okay, cheers Mr @DonManfred

I didn't even realise that there was a library until @XbNnX_507 mentioned it...

DonManfred · Jan 3, 2018

Peter Simpson said:
I didn't even realise that there was a library until @XbNnX_507 mentioned it...

me too. I started to do a wrap for the Android Job sheduler (this thread). But i failed
I give it another go on the posted lib....

XbNnX_507 · Jan 3, 2018

DonManfred said:
I give it another go on the posted lib....

thank you so much! . i bet it'll be a good addition to us and all of b4a community.

DonManfred · Jan 4, 2018

I think it is mandatory to create own (specialized) JOBCreator-Classes to use this Library...

B4X:

public class DemoJobCreator implements JobCreator {

    @Override
    @Nullable
    public Job create(@NonNull String tag) {
        switch (tag) {
            case DemoSyncJob.TAG:
                return new DemoSyncJob();
            default:
                return null;
        }
    }
}

After that you can start scheduling jobs.

B4X:

public class DemoSyncJob extends Job {

    public static final String TAG = "job_demo_tag";

    @Override
    @NonNull
    protected Result onRunJob(Params params) {
        // run your job here
        return Result.SUCCESS;
    }

    public static void scheduleJob() {
        new JobRequest.Builder(DemoSyncJob.TAG)
                .setExecutionWindow(30_000L, 40_000L)
                .build()
                .schedule();
    }
}

in this case the creator will always create a specific Job which we, the developers, need to use in the java project....

I´m not sure if it will work with a simple wrapper for this. We´ll see...
Hopefully i can post a 1st version to test today

DonManfred · Jan 5, 2018

It is partially working as of now...

*** Service (starter) Create ***
** Service (starter) Start **
Jobrequest created... Scheduling job
null
[request{id=8, tag=ReScheduling, transient=false}, request{id=11, tag=ReScheduling, transient=false}, request{id=13, tag=ReScheduling, transient=false}, request{id=22, tag=ReScheduling, transient=false}, request{id=19, tag=ReScheduling, transient=false}, request{id=3, tag=ReScheduling, transient=false}, request{id=4, tag=ReScheduling, transient=false}, request{id=15, tag=ReScheduling, transient=false}, request{id=18, tag=ReScheduling, transient=false}, request{id=23, tag=ReScheduling, transient=false}, request{id=9, tag=ReScheduling, transient=false}, request{id=24, tag=ReScheduling, transient=false}, request{id=17, tag=ReScheduling, transient=false}, request{id=12, tag=ReScheduling, transient=false}, request{id=21, tag=ReScheduling, transient=false}, request{id=10, tag=ReScheduling, transient=false}, request{id=14, tag=ReScheduling, transient=false}, request{id=16, tag=ReScheduling, transient=false}, request{id=7, tag=ReScheduling, transient=false}, request{id=20, tag=ReScheduling, transient=false}, request{id=2, tag=ReScheduling, transient=false}]
{}
** Activity (main) Create, isFirst = true **
** Activity (main) Resume **
createJob(ReScheduling) <----- This LOG comes from the JobCreator class inside the lib.
created MyReschedulingJob(ReScheduling) ' This too

i also can see more info in the unfiltered log

Run job, request{id=15, tag=ReScheduling, transient=false}, waited 00:55:20, interval 00:15:00, flex 00:05:00
createJob(ReScheduling)
created MyReschedulingJob(ReScheduling)
Executing request{id=15, tag=ReScheduling, transient=false}, context PlatformJobService
Finished job{id=15, finished=true, result=null, canceled=false, periodic=true, class=MyReschedulingJob, tag=ReScheduling}
Run job, request{id=3, tag=ReScheduling, transient=false}, waited 02:10:03, interval 00:15:00, flex 00:05:00
createJob(ReScheduling)
created MyReschedulingJob(ReScheduling)
Executing request{id=3, tag=ReScheduling, transient=false}, context PlatformJobService
Finished job{id=3, finished=true, result=null, canceled=false, periodic=true, class=MyReschedulingJob, tag=ReScheduling}
Finished job, request{id=15, tag=ReScheduling, transient=false} null

But the event to run the job does not raise. I need to investigate more....

Erel · Jan 5, 2018

I believe that adding support for JobScheduler requires an update to the core library and the B4A compiler. I do plan to address it.

DonManfred · Jan 5, 2018

Will it help if i create a thread in the java questionsforum posting my libs (as of now) source and an correspondending b4a example (I have this on my ToDo list for today...)?

Erel · Jan 5, 2018

Not sure. It will take some time for this feature to be added and it will probably won't be a "job scheduler library" but rather a more flexible way to work with receivers and how they interact with services.

dcoun · Mar 23, 2018

Erel said:
Not sure. It will take some time for this feature to be added and it will probably won't be a "job scheduler library" but rather a more flexible way to work with receivers and how they interact with services.

Hi, do we have a roadmap for that?

Erel · Mar 25, 2018

No.

However with B4A v8.0 you can implement background tasks very easily.

Wish Android Job Scheduler

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