Job Scheduler not running within set interval

Question

I'm trying to use the android Job Scheduler API and all I'm trying to do is have the Job Scheduler run every 5 seconds. However when I run it, the corresponding service is hit every two minutes. I have a log that documents every time the service is hit. I'm not sure why this is happening. Could the Job Scheduler have a minimum interval time. My code is simply...

JobInfo jobInfo = new JobInfo.Builder(1, new ComponentName(this, UpdateDatabaseService.class))
            .setPeriodic(5000)
            .build();

JobScheduler jobScheduler = (JobScheduler) getSystemService(Context.JOB_SCHEDULER_SERVICE);
jobScheduler.schedule(jobInfo);

The problem originally arose when I was trying to run a daily task but it would trigger the service multiple times within that day and wouldn't follow the time guideline.

Let me know what you think.

Answer 1

I was having this problem and after review some blogs and the official documentation, I realised that JobScheduler is having difference behavior on Android N(24 and 25). JobScheduler works with a minimum periodic of 15 mins.

@TargetApi(Build.VERSION_CODES.LOLLIPOP)
    @RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
    public static void setJobScheduler(Context context){
        Log.v(TAG, "Job Scheduler is starting");
        JobScheduler jobScheduler = (JobScheduler)context.getSystemService(Context.JOB_SCHEDULER_SERVICE);
        ComponentName serviceName = new ComponentName(context, JobService.class);
        JobInfo jobInfo;
        if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.N){
            jobInfo = new JobInfo.Builder(JOB_ID, serviceName)
                    .setPeriodic(900000)
                    .build();
        }else{
            jobInfo = new JobInfo.Builder(JOB_ID, serviceName)
                    .setPeriodic(Constants.TIME_INTERVAL)
                    .build();
        }
        jobScheduler.schedule(jobInfo);
    }

Answer 2

Instead of setPeriodic(int) use setMinimumLatency(int) with setOverrideDeadline(int). These two methods will adjust the interval of your JobScheduler.

Answer 3

JobInfo.Builder builder = new JobInfo.Builder(1,new ComponentName(getPackageName(), JobSchedulerService.class.getName()));

builder.setPeriodic(3000);

---

Edited

MainActivity.java

public class MainActivity extends Activity {

    private JobScheduler mJobScheduler;
    private Button mScheduleJobButton;
    private Button mCancelAllJobsButton;

    @Override
    protected void onCreate( Bundle savedInstanceState ) {
        super.onCreate( savedInstanceState );
        setContentView( R.layout.activity_main );
        mJobScheduler = (JobScheduler) getSystemService( Context.JOB_SCHEDULER_SERVICE );
        mScheduleJobButton = (Button) findViewById( R.id.schedule_job );
        mCancelAllJobsButton = (Button) findViewById( R.id.cancel_all );

        mScheduleJobButton.setOnClickListener( new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                JobInfo.Builder builder = new JobInfo.Builder( 1,
                        new ComponentName( getPackageName(), JobSchedulerService.class.getName() ) );

                builder.setPeriodic( 3000 );


                if( mJobScheduler.schedule( builder.build() ) <= 0 ) {
                    //If something goes wrong
                }
            }
        });

        mCancelAllJobsButton.setOnClickListener( new View.OnClickListener() {
            @Override
            public void onClick( View v ) {
                mJobScheduler.cancelAll();
            }
        });
    }
}

just need to change

new JobInfo.Builder(1, new ComponentName(this, UpdateDatabaseService.class))

to

new JobInfo.Builder( 1, new ComponentName( getPackageName(), JobSchedulerService.class.getName() ) )

builder.setPeriodic( 3000 ); will set JobInfo in 3000 ms schedule and called after every 3 seconds.

JobSchedulerService.java

public class JobSchedulerService extends JobService {

    private Handler mJobHandler = new Handler( new Handler.Callback() {
        @Override
        public boolean handleMessage( Message msg ) {
            Toast.makeText( getApplicationContext(), "JobService task running", Toast.LENGTH_SHORT ).show();
            jobFinished( (JobParameters) msg.obj, false );
            return true;
        }
    } );

    @Override
    public boolean onStartJob(JobParameters params ) {
        mJobHandler.sendMessage( Message.obtain( mJobHandler, 1, params ) );
        return true;
    }

    @Override
    public boolean onStopJob( JobParameters params ) {
        mJobHandler.removeMessages( 1 );
        return false;
    }

}

AndroidManifest.xml

<service android:name=".JobSchedulerService"
            android:permission="android.permission.BIND_JOB_SERVICE" />

activity_main.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <Button
        android:id="@+id/schedule_job"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Schedule Job"/>

    <Button
        android:id="@+id/cancel_all"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Cancel All"/>

</LinearLayout>