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我正在使用JobScheduler.setPeriodic()来重复我的JobIntentService.它第一次工作,但从不重复.在Android 7.0上运行

ConcurrentCheck.java

int mdelaymilles  = 30000;
JobScheduler jobScheduler = (JobScheduler) mActivity.getSystemService(JOB_SCHEDULER_SERVICE);
        ComponentName componentName = new ComponentName(mActivity, ConcurrentCheckService.class);
        JobInfo jobInfo = new JobInfo.Builder(JOB_ID, componentName)
                .setPeriodic(mdelaymilles)
                .setRequiredNetworkType(JobInfo.NETWORK_TYPE_ANY)
                .build();
        int resultCode = jobScheduler.schedule(jobInfo);
        if (resultCode == JobScheduler.RESULT_SUCCESS) {
            Log.d(LOG_TAG, "Job scheduled!");
            Intent intent = new Intent();
            intent.putExtra(LAST_POSITION, lastPosition);
            JobIntentService.enqueueWork(mActivity, ConcurrentCheckService.class, JOB_ID, intent);
        } else {
            Log.d(LOG_TAG, "Job not scheduled");
        }