在满足条件时运行定期作业

Question

我使用以下代码使每次有可用的互联网时运行作业。另外，我想要的是，在触发服务后(由于可用连接(，只要有互联网，我希望该服务继续定期(每 30 秒(运行 g，然后当连接不再可用时，服务应该停止，只有在下次有互联网时恢复。

FirebaseJobDispatcher jobDispatcher = new FirebaseJobDispatcher(new GooglePlayDriver(MainActivity.this));
                        .setTag("JobService")
                        .setRecurring(true)
                        .setLifetime(Lifetime.FOREVER)
                        .setService(JobService.class)
                        .setTrigger(Trigger.executionWindow(0,10))
                        .setReplaceCurrent(true)
                        .setRetryStrategy(RetryStrategy.DEFAULT_EXPONENTIAL);    
                builder.addConstraint(Constraint.ON_UNMETERED_NETWORK);
                jobDispatcher.mustSchedule(builder.build());

我想让 JobService 本身在下次运行时(三十秒内(进行调度，在时间结束后，测试是否有互联网，然后好吧，否则我会调用 Onstop 方法，但它感觉不像是解决这个问题的正确方法。

Answer 1

你可以

写： setTrigger(Trigger.executionWindow(30,40)) . 解释：Firebase Job Dispatcher GitHub

Scheduling a more complex job
Bundle myExtrasBundle = new Bundle();
myExtrasBundle.putString("some_key", "some_value");
Job myJob = dispatcher.newJobBuilder()
    // the JobService that will be called
    .setService(MyJobService.class)
    // uniquely identifies the job
    .setTag("my-unique-tag")
    // one-off job
    .setRecurring(false)
    // don't persist past a device reboot
    .setLifetime(Lifetime.UNTIL_NEXT_BOOT)
    // start between 0 and 60 seconds from now
    .setTrigger(Trigger.executionWindow(0, 60))

或者对于 executionWindow，规则是：

.setTrigger(Trigger.executionWindow(
                        INTERVAL_IN_SECONDS,
                        INTERVAL_IN_SECONDS + TIME_WINDOW_IN_SECONDS
                ))

参考： https://stackoverflow.com/a/39909986/1537413