为什么即使未满足职位信息的要求，后台服务仍能继续运行？

我试图根据互联网连接（蜂窝）执行后台任务，所以我在jobinfo中设置了RequiredNetworkType（JobInfo.NETWORK_TYPE_CELLULAR），我期望后台作业服务在蜂窝互联网连接打开之前不会运行，但是即使关闭Internet连接，服务也会运行。

这是我的代码（jobinfo）

ComponentName componentName=new ComponentName(this,MyService.class);
JobInfo info=new JobInfo.Builder(0,componentName)
    .setRequiredNetworkType(JobInfo.NETWORK_TYPE_CELLULAR)
    .setPersisted(true)
    .setPeriodic(15000)
    .build();

JobScheduler scheduler = (JobScheduler) getSystemService(JOB_SCHEDULER_SERVICE);
int resultcode=scheduler.schedule(info);
if (resultcode==JobScheduler.RESULT_SUCCESS){
Log.d(TAG,"job scheduled");
}else{
Log.d(TAG,"failed");
}

我的工作服务

private static final String TAG="MyService";
boolean jobcancelled=false;



@Override
public boolean onStartJob(JobParameters params) {
backgroundService(params);
return true;
}

private void backgroundService(final JobParameters params) {

new Thread(new Runnable() {
@Override
public void run() {
    if (jobcancelled) {
        return;
    }

        Notification.Builder notification = new Notification.Builder(MyService.this)
            // this Builder class is deprecated
                .setDefaults(NotificationCompat.DEFAULT_SOUND)
                .setPriority(Notification.PRIORITY_MAX)
                .setLights(0xff00ff00, 300, 100)
                .setSmallIcon(R.drawable.ic_launcher_background)
                .setContentTitle("My notification")
                .setContentText("Hello Peter");


            NotificationManagerCompat manager =   NotificationManagerCompat.from(MyService.this);
        manager.notify(1, notification.build());


    jobFinished(params,false);
}
}).start();
}
@Override
public boolean onStopJob(JobParameters params) {
Log.d(TAG,"job cancelled before completion");
jobcancelled=true;
return true;
}