我需要在我的BroadcastReceiver唤醒锁，如果我没有启动的服务或活动？ [英] do I need a wake lock in my broadcastreceiver if I'm not starting a service or an activity?

问题描述

我有一个调用报警（计划与AlarmManager）的BroadcastReceiver。在这个接收器，我只能查询一个寄存器从数据库中，并推出了通知。我readed，当一个服务或活动从广播接收器启动时需要一个唤醒锁，但是，我需要一个唤醒锁，如果我只是想显示notificacion（通知面板）？

解决方案

  

在此接收器，我只查询一个寄存器从数据库中，并推出了通知。

不要做数据库的I / O主应用程序线程上。

  

我readed，当一个服务或活动从广播接收器启动时需要一个唤醒锁，但是，我需要一个唤醒锁，如果我只是想显示notificacion（通知面板）？

在一般情况下，不，你不会需要一个 WakeLock 从的BroadcastReceiver ，即使该通过调用一个 _WAKEUP 报警。 AlarmManager 在这种情况下，可以保证它将器件保持清醒利用自身 WakeLock 。

然而，同样，在这种情况下，你真的不应该做数据库I / O主应用程序线程上，和的onReceive（）被称为主应用程序线。这里的正确的模式是您移动查询从数据库中注册，并启动通知给 IntentService ，您的 BroadcastReceiver的<启动/ code>，这样的工作是在后台线程完成。这的将的要求 WakeLock ，因为你现在做的工作的onReceive（）之外 。我有一个 WakefulIntentService 管理​​该 WakeLock 为您，如果你想使用它。

I have a broadcastreceiver called by an Alarm (scheduled with AlarmManager). In this receiver I'm only querying a register from the database, and launching a notification. I readed that a wake lock is needed when a service or an activity is started from a broadcast receiver, but, do I need a wake lock if I only want to show a notificacion (in the notification panel)?

解决方案

In this receiver I'm only querying a register from the database, and launching a notification.

Do not do database I/O on the main application thread.

I readed that a wake lock is needed when a service or an activity is started from a broadcast receiver, but, do I need a wake lock if I only want to show a notificacion (in the notification panel)?

In general, no, you would not need a WakeLock from a BroadcastReceiver, even one that is invoked via a _WAKEUP alarm. AlarmManager guarantees in this case that it will keep the device awake using its own WakeLock.

However, again, in this case, you really should not be doing database I/O on the main application thread, and onReceive() is called on the main application thread. The proper pattern here is that you move your "querying a register from the database, and launching a notification" to an IntentService, started by your BroadcastReceiver, so that the work is done on a background thread. This will require a WakeLock, as you are now doing work outside of onReceive(). I have a WakefulIntentService that manages the WakeLock for you, if you wish to use it.

这篇关于我需要在我的BroadcastReceiver唤醒锁，如果我没有启动的服务或活动？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！