In every example I saw, the data is somehow synonymous to basic (raw) data -- ints, chars, array of bools, and so on -- this is too limiting for me, because I would like to pass a regular object.
So how to pass any data to activity, like for example, instance of MyClass?
I checked the Intent.putExtra -- all I found was basic types + Bundle, but Bundle itself also handles only basic types.
There are several way to do it as described in android guide faq.
I think that in your case static variables could help most.
You could also implement Application and use it to share your data between Activities. Here is short tutorial on that.