通过处理程序的广播接收器或信使
我有一个 IntentService ，它需要将消息传递给 Activity。 我知道有两种方法可以做到这一点。
在
Service端使用sendBroadcast()，同时在Activity端注册一个broadcastReciever来接收消息。将
Messenger传递到Service端，它将指向Activity端的Handler，它将准备好从服务接收该消息。
哪一个适合什么目的？或者两者都做同样的事情？
I have an IntentService which need to pass a message to an Activity.
I know two ways of doing so.
use
sendBroadcast()at theServiceside while registering abroadcastRecieverat theActivityside which will receiver the message.passing a
Messengerto the Serviceside, which will point to aHandlerat theActivityside, which will be ready to receive that message from the service.
Which one is good for which purpose? Or both of them do the same?
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如果您的 IntentService 不知道该 Activity 是否存在（例如，可能已被销毁），或者是否有多个 Activity 可能位于前台并且想要了解正在发生的情况，我会使用
sendOrderedBroadcast()。如果需要，您还可以安排一个“后备”BroadcastReceiver，它可以在需要时发出通知，正如我在 此博文 并在 此示例项目。不过，您的任何一种技术都可以发挥作用。
If your
IntentServicedoes not know whether the activity will exist (e.g., might have been destroyed), or if there are multiple activities that might be in the foreground and would want to know about what's going on, I'd usesendOrderedBroadcast(). You can arrange to then also have a "backstop"BroadcastReceiverthat could raise a Notification, if desired, as I outline in this blog post and demonstrate in this sample project.Either of your techniques can work, though.