JobScheduler onStartJob gets delayed once application gets killed

Question

I am not getting why service onStartJob not calling with given time which mentioned in setOverrideDeadline(2000).

I am scheduling job like:

private void scheduleJob() {
    JobInfo myJob = new JobInfo.Builder(0, new ComponentName(this, NetworkSchedulerService.class))
            .setRequiresCharging(true)
            .setMinimumLatency(1000)
            .setOverrideDeadline(2000)
            .setRequiredNetworkType(JobInfo.NETWORK_TYPE_ANY)
            .setPersisted(true)
            .build();

    JobScheduler jobScheduler = (JobScheduler) getSystemService(Context.JOB_SCHEDULER_SERVICE);
    jobScheduler.schedule(myJob);
}

JobService snippet:

public class NetworkSchedulerService extends JobService implements
        ConnectivityReceiver.ConnectivityReceiverListener {

    private static final String TAG = NetworkSchedulerService.class.getSimpleName();

    private ConnectivityReceiver mConnectivityReceiver;

    @Override
    public void onCreate() {
        super.onCreate();
        Log.i(TAG, "Service created");
        mConnectivityReceiver = new ConnectivityReceiver(this);
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
        Log.i(TAG, "Service destroyed");
    }

    /**
     * When the app's MainActivity is created, it starts this service. This is so that the
     * activity and this service can communicate back and forth. See "setUiCallback()"
     */
    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        Log.i(TAG, "onStartCommand");
        return START_NOT_STICKY;
    }


    @Override
    public boolean onStartJob(JobParameters params) {
        Log.i(TAG, "onStartJob" + mConnectivityReceiver);
        registerReceiver(mConnectivityReceiver, new IntentFilter(Constants.CONNECTIVITY_ACTION));
        return true;
    }

    @Override
    public boolean onStopJob(JobParameters params) {
        Log.i(TAG, "onStopJob");
        unregisterReceiver(mConnectivityReceiver);
        return true;
    }
}

Manifest:

 <service
            android:name=".NetworkSchedulerService"
            android:exported="true"
            android:permission="android.permission.BIND_JOB_SERVICE"/>

Can somebody please help me to resolve this issue? If possible please provide detail explanation about this delay.

Answer 1

 @Override
    public boolean onStartJob(JobParameters params) {
        Log.i(TAG, "onStartJob" + mConnectivityReceiver);
        return true;
    }

The above method call gets delayed due to system resource unavailability. It is not necessary that JobSceduler will start the job within given deadline which I mentioned in the above code.

eg: setOverrideDeadline(2000)

Some of JobInfo methods like setRequiresCharging() and setRequiresBatteryNotLow() can decrease the delay.

Note: This delay varies in both Nougat and Oreo devices. So It's necessary to look at their delay.

Answer 2

Try adding enabled attribute to NetworkSchedulerService in Manifest:

android:enabled="true"