服务还是活动？

Question

I'm struggling to decide which class to use, Activity or Service. My application is complicated so I will use another example. A timer.

I would like to create an application that start to count the seconds when I open the application and keep counting even when I click the back button. When I back to the application it will have a gui that show me the time.

So the gui I guess would be the activity and the counting method would be on the service.. but how do I manage that system?how they will be communicating? how can I do that?

Answer 1

您可以使用BroadcastReceivers并发送活动将要收听的广播，也可以使用Messenger将消息从服​​务发送到活动

Answer 2

他们可以与意图进行通信，也可以通过共享存储或内容提供商进行通信，...