Java android Firebase JobDispatcher每30秒执行一次

Question

我想要创建一个应该每30秒执行一次的任务，我尝试了下面的代码，但它没有正常工作它不会每30秒运行一次，有时需要一分钟，有时需要2分钟我和我不知道我做错了什么。而且这项任务必须始终有效，即使手机处于睡眠状态也应该可以正常工作。我这样使用JobDispatcher来做到这一点。

我这样做了：

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        scheduleJob(this);
    }

    public static void scheduleJob(Context context) {
        //creating new firebase job dispatcher
        FirebaseJobDispatcher dispatcher = new FirebaseJobDispatcher(new GooglePlayDriver(context));
        //creating new job and adding it with dispatcher
        Job job = createJob(dispatcher);
        dispatcher.mustSchedule(job);
    }

    public static Job createJob(FirebaseJobDispatcher dispatcher){

        Job job = dispatcher.newJobBuilder()
                //persist the task across boots
                .setLifetime(Lifetime.FOREVER)
                //.setLifetime(Lifetime.UNTIL_NEXT_BOOT)
                //call this service when the criteria are met.
                .setService(ScheduledJobService.class)
                //unique id of the task
                .setTag("UniqueTagForYourJob")
                //don't overwrite an existing job with the same tag
                .setReplaceCurrent(false)
                // We are mentioning that the job is periodic.
                .setRecurring(true)
                // Run between 30 - 60 seconds from now.
                .setTrigger(Trigger.executionWindow(30, 60))
                // retry with exponential backoff
                .setRetryStrategy(RetryStrategy.DEFAULT_LINEAR)
                //.setRetryStrategy(RetryStrategy.DEFAULT_EXPONENTIAL)
                //Run this job only when the network is available.
                .setConstraints(Constraint.ON_ANY_NETWORK, Constraint.DEVICE_CHARGING)
                .build();
        return job;
    }

    public static Job updateJob(FirebaseJobDispatcher dispatcher) {
        Job newJob = dispatcher.newJobBuilder()
                //update if any task with the given tag exists.
                .setReplaceCurrent(true)
                //Integrate the job you want to start.
                .setService(ScheduledJobService.class)
                .setTag("UniqueTagForYourJob")
                // Run between 30 - 60 seconds from now.
                .setTrigger(Trigger.executionWindow(30, 60))
                .build();
        return newJob;
    }

}