how to get instance of the launched activity

Is there any way to get the instance of a launched activity(or any view in that activity )of开发者_如何学编程 a application in another application.

Thanks in advance.

No, you'll have to do with sending Intent's.

A central design point of the Android security architecture is that no application, by default, has permission to perform any operations that would adversely impact other applications, the operating system, or the user.

From http://developer.android.com/guide/topics/security/security.html