event when app is started, stopped and paused

Issue

I want to log when the user opens and kills the app, and when it is put to the background. So far I have been trying with onStart/onStop/onPause/onResume/onDestroy etc, but this is only about the activity that I put this on, not the entire app. So when the user goes from the MainActivity to some other Activity inside the app, I don't need to know, but when he then goes out of the app, or even kills it, I would like to log that.

Any suggestions? (Did I write it down clear enough?)

Solution

onCreate()?

See the lifecycle diagram

Given your comments it seems you want the Application Lifecycle

Make a class that extends Application to make use of these (it will be instantiated automatically), just make sure you specify its name in your AndroidManifest.xml's application tag

Edit

I see your confusion, you want just oncreate/terminate here on the Application class

Answered By - Nick Cardoso