Using static methods/structures to pass data between activities

Jim :

If I want to pass data between activities in the same application, a) I can use an Intent or b) use a database (passing the id in the Intent instead of the full data.
But I could also use c) a class with static data structures that both activities can access in a store/fetch fashion.
What are the cons of using (c) if I don't care about persistence of the data on app restart?

Giorgio Antonioli :

The big cons is that the Android OS can kill your process at any time. When the process will be re-created, Android will re-create all of your activities restoring their state.

Since Android doesn't know about how your static data should be handled, you will lose it and Activity B will be in an inconsistent state.

I'll make an example to be clearer:

1. Activity A is launched
2. A button on Activity A is clicked
3. Static data structures are being populated before launching Activity B
4. Activity B is launched and can access the static data
5. Android OS kills automatically your process
6. Activity A and Activity B are restored
7. The static data structures are not populated since they would have been populated when the button on Activity A is clicked
8. Activity B is in an inconsistent state

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