Is it possible in Android to open other App than the one you clicked on?

Question

I am wondering if it is possible to intercept an open application call, for any(most of the) installed application. Or at least for opening the Activity having the intent-filter's action set to Main (if it exists for an app).

Answer 1

No, sorry, this is not possible. The startActivity() calls are targeted to specific components and cannot be intercepted. After all, this would be a massive security hole otherwise.