对于OneTimeWorkRequest,我们可以将setInitialDelay设置为特定的初始延迟.
但是,PeriodicWorkRequest没有这样的功能.
有没有可靠的方法来实现这一目标？
一种不太可靠的方法是使用延迟的OneTimeWorkRequest工作程序来设置PeriodicWorkRequest.但是,这非常麻烦,并且创建了一种可能性,OneTimeWorkRequest可能会失败并且无法安装PeriodicWorkRequest.
解决方法
您可以使用此PeriodicWorkRequest.Builder并提供flexInterval作为第4个参数：
PeriodicWorkRequest build = new PeriodicWorkRequest.Builder(
SyncJobWorker.class,REPEAT_INTERVAL,// repeatInterval
TimeUnit.MILLISECONDS,// repeatIntervalTimeUnit
FLEX_INTERVAL,// flexInterval
TimeUnit.MILLISECONDS) // flexIntervalTimeUnit
.build();
文件编号：https://developer.android.com/reference/androidx/work/PeriodicWorkRequest.Builder#periodicworkrequestbuilder_2
Creates a PeriodicWorkRequest to run periodically once within the flex period of every interval period. See diagram below. The flex period begins at intervalMillis – flexMillis to the end of the interval. intervalMillis must be greater than or equal to PeriodicWorkRequest.MIN_PERIODIC_INTERVAL_MILLIS and flexMillis must be greater than or equal to PeriodicWorkRequest.MIN_PERIODIC_FLEX_MILLIS.
