9

我在新的 Android API 21 中使用 JobScheduler 的作业计划有问题。这是我以 60 秒间隔安排作业的代码,如下所示:

ComponentName serviceName = new ComponentName(this, MyJobService.class);
JobInfo jobInfo = new JobInfo.Builder(0, serviceName)
        .setRequiredNetworkType(JobInfo.NETWORK_TYPE_ANY)
        .setPeriodic(60000)
        .build();

我的 JobService 只打印 Logcat 中的运行时间,但日志显示该服务在这个时刻运行:

03-18 08:37:26.334: I/JOB(32662): Wed Mar 18 08:37:26 BRT 2015
03-18 08:37:56.364: I/JOB(32662): Wed Mar 18 08:37:56 BRT 2015
03-18 08:39:21.418: I/JOB(32662): Wed Mar 18 08:39:21 BRT 2015
03-18 08:41:51.670: I/JOB(32662): Wed Mar 18 08:41:51 BRT 2015
03-18 08:45:52.192: I/JOB(32662): Wed Mar 18 08:45:52 BRT 2015
03-18 08:54:20.678: I/JOB(32662): Wed Mar 18 08:54:20 BRT 2015

这很奇怪,因为我使用 setPeriodic(60000) 方法设置的作业应该在 1 分钟内至少执行 1 次。运行之间的间隔如何增加也很好奇。此时时间是 Wed Mar 18 09:09:00 BRT 2015 并且 Job 不再执行。

JobScheduler API 有问题吗?(我在带有 Android 5.0.1 的 Nexus 5 中运行)

4

3 回答 3

9

时间更改与重试作业的退避标准有关。默认情况下,它设置为指数。我猜你在通过调用完成工作时也没有正确完成工作jobFinished(JobParameters params, boolean needsReschedule)

我写了一篇博客文章,重点介绍了 JobScheduler 的所有小事。我强烈推荐阅读它。

于 2015-04-13T20:28:24.403 回答
5

我有同样的问题,我认为它可能与 JobInfo 类的内部要求有关:

JobInfo 的源代码

    /* Minimum interval for a periodic job, in milliseconds. */
private static final long MIN_PERIOD_MILLIS = 15 * 60 * 1000L;   // 15 minutes

看起来 JobInfo 不允许您将间隔设置为小于该值。

于 2017-01-28T21:59:55.857 回答
1

//下面是我在我的一个项目中使用的代码,它对我来说工作正常。

@RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
    public void scheduleJob(Context context) {
        //https://kb.sos-berlin.com/pages/viewpage.action?pageId=3638048
        //Scheduler uses UTC times for all its internal operations. This ensures a continual flow of operation without breaks or repetitions regardless of any changes in local time.
        JobInfo.Builder builder = new JobInfo.Builder(JOB_ID, new ComponentName(context, MyService.class));//JobSchedulerService.class.getName()));
        builder.setPersisted(true); //persist across device reboots

        builder.setPeriodic((120 * 60 * 1000)); //run once after 2 hours seconds

        builder.setRequiredNetworkType(JobInfo.NETWORK_TYPE_ANY); // only if wifi avaiblable so they are not using bandwith
        builder.setRequiresDeviceIdle(false); // run not only if the device is idle
        builder.setRequiresCharging(false); // run not only if the device is charging

       // android.os.PersistableBundle bundle = new android.os.PersistableBundle();
        // bundle.putString(WEB_SERVICE_URL, "http://example.com?upload.php");
        //   builder.setExtras(bundle);

        //builder.setBackoffCriteria(1600, JobInfo.BACKOFF_POLICY_LINEAR);
        //BACKOFF_POLICY_LINEAR After one failure retry at 1 * your value, then at 2 * (your value), then 3 * (your value) and so on
        //BACKOFF_POLICY_EXPONENTIAL After one failure retry at your value, then at (your value)^2, (your value)^3 and so on
        //builder.setMinimumLatency(5 * 1000); //latency
        //builder.setOverrideDeadline(50 * 1000); //wait for criteria to be met, in 50 seconds if they have not then run anyways


        int test = jobScheduler.schedule(builder.build());
        if (test <= 0) {
            Utility.showDialog(context, "Service Error", "Service is not responding");
            //If something goes wrong
        }
    }

我们按照以下说明定义了服务类别:

@RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
public class MyService extends JobService {

    @Override
    @TargetApi(Build.VERSION_CODES.LOLLIPOP)
    public boolean onStartJob(final JobParameters params) {

        Log.e(TAG, "onStartJob");

        String month = "3";
        String year = "2018";           
MyAsync myAsync = new MyAsync(MyService.this, arraydata, month, year, new SyncAsyncListener() {
                    @Override
                    public void onDataSuccess() {
                        try {
                            jobFinished(params, result);
                        } catch (Exception e) {

                        }
                    }
                });

                myAsync.execute();
            }
    return result;
}
@Override
public boolean onStopJob(JobParameters jobParameters) {
    return false;
}
}
于 2018-03-31T10:56:27.853 回答