服务生命周期的开始和约束？ [英] lifecycle of Service that is started and bound?

问题描述

我感到困惑的服务生命周期。结果
我有以下诸多问题：

1. 如果我的应用程序调用 startService（）多次到服务，是否有同时运行多个服务？或只有一个？




2. 作为1，如果我叫 bindService（）多次在我的应用程序服务，会发生什么事我的应用程序？




3. 假设我有一个已经通过启动的服务startService（），再后来我绑定，以指示它做一些事情。在这种情况下，如果我指示（通过此Binder接口）来执行它的 stopSelf（）方法的服务，并正在运行的服务立即停止？




4. 再假设我有一个只能通过启动服务bindService（）和 onUnbind 被覆盖，返回true，在这种情况下，我应该叫 stopSelf 明确的方法来关闭服务？

解决方案

是的，你可以同时运行多个服务。但是，如果你正在使用的服务，你必须小心这样做。如果你开始一个服务，你必须停止像的onDestroy任何方法（）或自定义方法的服务，因为每当你完成你的活动，该服务仍处于运行背景。

一件事：使用服务，只有当你需要像媒体播放器后台进程;否则，就可以实现所有这些与活动。

有关详细信息，请阅读 Android开发者服务文档。

I am confused about Service lifecycle.
I have many questions following:

1. If my app calls startService() multiple times to a Service, will there be multiple Services running simultaneously? Or only one?

2. As 1st, if I call bindService() multiple times to a Service in my app, what will happen to my app?

3. Assume that I have a Service that has been started via startService(), and then later I bind it in order to instruct it to do something. in this case, if I instruct (via this Binder interface) the Service to execute its stopSelf() method, does the running Service stop immediately?

4. Assume again that I have a Service that can be started only by bindService(), and the onUnbind is overridden to return true, in this case, should I call stopSelf method explicitly to shutdown the Service?

解决方案

Yes, you can run multiple services simultaneously. But if you are using a service, you have to do so with care. If you are starting a service, you have to stop that service on any method like onDestroy() or custom method, because whenever you finish your activity, the service is still running in background.

One more thing: use service only when you need background process like media player; otherwise, you can achieve all these with activity.

For more information read the Android developer service document.

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