How to keep activity running in background? [dupli

问题:

This question already has answers here:

How to check if a service is running on Android? (30 answers)

Closed 6 years ago.

Most of you must have used "whatsapp" and "viber". These apps constantly keep running even when they are exited. I want one of my activities to keep running in the background after its being ran for the first time. And I also want the whole app to keep running in the background like viber and whatsapp do. How can I do that?

回答1:

Use service. Read this and this about details of service.

You can keep your activity running in the background. But I think it is definitely a better idea to keep a service running in the background. You will get a basic idea about the service by reading above two links.

回答2:

It's not the Activity that keeps running in the background but a Service. Look at http://developer.android.com/reference/android/app/Service.html for implementing it.