When is savedInstanceState really used?

I'm new to Android, and i'm having some troubles with savedInstanceState and managing the lifecycle.

http://developer.android.com/guide/topics/fundamentals/activities.html#Lifecycle I read the article about lifecycle, but I don't really know WHEN the process is killed, and my nice savedInstanceSate will be used ! I can press "HOME", but it only launches "onPause" then "onResume" I think.

If I go to Menu->Settings->Application->Manage Application->My application name->Force Stop, it is still seen as a running app, but when I relaunch it, I go back to the "first activity". So it is like closing the application, it's not "Killing the process" as I would like, if I understand well.

So here are my questions :

1)How can I be sure my process have been killed (so my app will use the savedIntanceState when restarted) ?

2)How can I force the process to be killed, to test if my savedInstanceState are well programmed ?

3)When after having been "killed", the app is restarted and the "onCreate" is called (with a savedInstanceState!=null that time), can I still acces to the Intent Extra informations I gave when I called the Activity, or the infomations of the Intent were deleted when the process is killed ? Said differently, must I include in my saveInstanceState a copy of what开发者_JAVA技巧 was stored in the Intent Extra ?

I hope I'm clear enough ;)

1) All you need to worry about is overriding your Activity's onSaveInstanceState(). Android will call that before it kills your process.

2) You need to setup an Android test project. Then, create a test which extends ActivityInstrumentationTestCase2, and you can get an Instrumentation object by calling `getInstrumentation(). From there, you can call Instrumentation.callActivityOnCreate and pass a Bundle object to use for testing.

3) I am pretty sure that you will have store the extras in the savedInstanceState bundle.