Question

As you all knows all android activities create, start, resume, run, pause, stop, destroy. This process is shown well in the android manual.

In this lifecycle is there any possiblity to understand activity is created which way? I mean how can I understand whether activity is called directly or activity is created once then killed by android os and then recreated since user navigates back?

More basically how can I understand whether an activity is in its second life or first life?

Edit: Why do I need this?
In my design I have a main page where the data is loaded from the net. And when the user clicks some details, it puts the data in a static object just like session in web. This works well normally.

But when a user starts detail activity in second life, he data in static object is killed, and I got nullpointer exception.

I have 4 projects having same architecture so I want to solve this problem.

Answer 1

You’ve already got the flow chart information there. You can always keep some state for later use by storing the fact of your Activity‘s demise during onDestory() or similar. Then, the next time your Activity is resumed, you will know if you were actually destroyed or just stopped. I don’t think you get any of that information for free from the OS, since it’s not supposed to matter in the ideal case.