Firebase jobdispatcher触发作业一次

我使用firebase作业调度器进行网络呼叫,比如说每30秒,我的服务级别:

 @Override
public boolean onStartJob(JobParameters job) {
    getLocation();
    return true;
}

我的工作实例是:

 Job job = dispatcher.newJobBuilder()
            .setLifetime(Lifetime.FOREVER)
            .setService(ScheduledJobService.class)
            .setTag("UniqueTagForYourJob")
            .setReplaceCurrent(false)
            .setRecurring(true)
            .setTrigger(Trigger.executionWindow(0,20))
            .setRetryStrategy(RetryStrategy.DEFAULT_LINEAR)
            .setConstraints(Constraint.ON_ANY_NETWORK)
            .build();