安卓定期同步

Question

我有一个 SyncAdapter 需要在每个午夜同步。我正在使用 ContentResolver.addPeriodicSync 执行定期同步，但我不知道如何在午夜触发它。

我考虑过几个选项，但似乎都不是很正确:

1. 设置一个在午夜触发的警报(使用 AlarmManager)，触发一个带有同步 Intent 的 Broadcast 并在每个 Activity 中注册/注销接收器>.
2. 与 1. 类似，但使用 Service。该服务在启动时触发并无限期运行。

关于如何正确执行此操作的任何想法？

Answer 1

来自 Android 同步适配器指南:

Notice that addPeriodicSync() doesn't run the sync adapter at a particular time of day. To run your sync adapter at roughly the same time every day, use a repeating alarm as a trigger. Repeating alarms are described in more detail in the reference documentation for AlarmManager. If you use the method setInexactRepeating() to set time-of-day triggers that have some variation, you should still randomize the start time to ensure that sync adapter runs from different devices are staggered.

jlhonora 你的评论是正确的:

The spike can be avoided using a random start for the alarm and triggering it with AlarmManager.setInexactRepeating

因此您使用 AlarmManager 的方向正确，但应考虑随机启动。

参见 Running a Sync Adapter periodically获取我引用的完整指南。