Job Scheduler not running within set interval

问题

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.

回答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);
    }

回答2:

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

回答3:

You should call jobFinished(jobParams,needResheduleBoolean);, after this call only the job will execute again, this is how the job knows it has finished execution so can start once more.

回答4:

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>

回答5:

From android documentation of setPeriodic ,

setPeriodic (long intervalMillis) : Specify that this job should recur with the provided interval, not more than once per period. You have no control over when within this interval this job will be executed, only the guarantee that it will be executed at most once within this interval.

so it is clearly mentioned that it is not necessary that job will run during this time. If you want to run a job at some periodic specific time , then you shoulf better use AlarmManager Api with setRepeating() method . Follow this link below for your requirements .

https://developer.android.com/training/scheduling/alarms.html#set

回答6:

You need minimum 30 seconds to wait for next job

来源：https://stackoverflow.com/questions/29492022/job-scheduler-not-running-within-set-interval