Apps Not understanding a basic concept of Android dev

[suffer1034]

I seem to be missing a rather large concept of Android development. The gist is I am struggling understanding how to tie an application together. I

 

[id0001]

In the manifest file you set the startup activity. So Animation3 which is an activity get started by the virtual machine because it is set as the startup activity.

I suggest you read the official dev guide. Especially the 'Application fundamentals'. It explains the lifecycle of an application and what all the different components do.
The Developer's Guide | Android Developers

-id