Question

我在新的Android API 21中遇到JobScheduler的作业计划问题。这是我用60秒间隔安排工作的代码，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只在Logcat中打印运行时，但是日志显示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，因为在我使用setPeriodic（60000）方法设置时，它应该在1分钟内执行至少1次。同样好奇的是如何在运行之间增加间隔。此时的时间是2015年3月18日星期三09:09:00 BRT 2015并且工作不会被执行更多。

JobScheduler API存在问题吗？（我在使用Android 5.0.1的Nexus 5中运行）

Answer 1

时间的变化与重试作业的退避标准有关。默认情况下，它设置为指数。我猜你通过拨打jobFinished(JobParameters params, boolean needsReschedule)完成工作后也未正确完成工作。

我写了一个blog post，专注于JobScheduler的所有小事情。我强烈建议你阅读它。

Answer 2

我遇到了同样的问题，我认为它可能与JobInfo类的内部要求有关：

Source code for JobInfo

checkForLastName

看起来JobInfo似乎不允许你把间隔小于那个。

Answer 3

//下面是我在我的项目中使用的代码，它对我来说很好。

@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
        }
    }

我们按照以下指示定义了服务类：

@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;
}
}

在Android中使用JobScheduler安排作业

3 个答案: