android AlarmManager

iteye_11596

于 2014-02-11 14:04:12 发布

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分类专栏： android 文章标签：移动开发

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本文探讨了Android中AlarmManager的工作原理及其与WakeLock的关系。当AlarmManager触发BroadcastReceiver的onReceive方法时，会保持CPU唤醒锁，确保设备在此期间不进入休眠状态。文章还讨论了如果BroadcastReceiver启动服务，可能在服务启动前设备就进入休眠的问题，并提出了相应的解决策略。

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http://developer.android.com/reference/android/app/AlarmManager.html

The Alarm Manager holds a CPU wake lock as long as the alarm receiver's onReceive() method is executing. This guarantees that the phone will not sleep until you have finished handling the broadcast. Once onReceive() returns, the Alarm Manager releases this wake lock. This means that the phone will in some cases sleep as soon as your onReceive() method completes.

If your alarm receiver called Context.startService(), it is possible that the phone will sleep before the requested service is launched. To prevent this, your BroadcastReceiver and Service will need to implement a separate wake lock policy to ensure that the phone continues running until the service becomes available.