AlarmManager 在睡眠模式下不工作 [英] AlarmManager not working in sleep mode

问题描述

我设置了一个带有重复时间的 AlarmManagr.这是我设置它的方法:

I have set an AlarmManagr with a repeat time. Here is my method by which I am setting it:

public void setAlarmManager(Context context, Intent intent) {           
    PendingIntent pendingIntent;
    pendingIntent  = PendingIntent.getService(context, 0, intent, 0);               
    AlarmManager alarmManager =
        (AlarmManager)context.getSystemService(context.ALARM_SERVICE);

    Calendar calendar = Calendar.getInstance();
    calendar.setTimeInMillis(System.currentTimeMillis());
    calendar.add(Calendar.SECOND, 10);
    alarmManager.setRepeating(AlarmManager.RTC_WAKEUP, 
                              calendar.getTimeInMillis(), 
                              40000, pendingIntent);                   
}

这很好用，除非我的设备进入睡眠模式时闹钟停止工作，直到我手动唤醒我的设备.唤醒设备后，AlarmManager 再次开始工作.

This works fine except when my device goes into sleep mode the the alarm stops working until I awake my device manually. After waking the device the AlarmManager start working again.

如何让管理器即使在睡眠模式下也能运行?

How to keep the manager running even in sleep mode?

推荐答案

这是因为你的 PendingIntent 正在调用一个服务而不是一个 BroadcastReceiver，这意味着设备甚至可以在您的服务创建之前重新进入睡眠状态.如果您移动到广播接收器，它应该"保持唤醒状态，直到 BroadcastReceiver 的 onReceive 完成，这意味着您将有时间获得唤醒锁并启动您的服务.即使您转移到 BroadcastReceiver，如果处理时间超过 10 秒(这是 BroadcastReceiver>).

It is because your PendingIntent is calling to a service and not to a BroadcastReceiver which means the device can go back to sleep before your service is even created. If you move to a broadcast receiver it "should" stay awake until the onReceive is complete of the BroadcastReceiver which means you will have time to get a wakelock and start your service. Even if you move to a BroadcastReceiver you will want to acquire a wakelock until you have completed your processing if it's going to take more than 10 seconds (which is the limit of a BroadcastReceiver).

这是取自 AlarmManager 的 android 文档的第 2 段:

This is taken from paragraph 2 of the android documentation of AlarmManager:

"... 如果您的警报接收器调用了 Context.startService()，则手机可能会在请求的服务启动之前休眠.为了防止这种情况，您的 BroadcastReceiver 和 Service 将需要实施单独的唤醒锁定策略，以确保手机继续运行，直到服务可用."

"... 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."

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