I’ll start by showing what I’am trying to do with a picture, please take a look

As you can see I have three buttons that are in the main activity, when i press BTN_1 i want the fragment to initialize an activity lets call it Activity_A that has it’s own layout and functions, same with BTN_2 and BTN_3 , each button starts a different activity, the buttons are static, they stay there forever.
Basically its one activity that is static that hold inside it a dynamic fragment that is dynamically changed to different activity’s
I’m kind of lost here so any help would be more than thankful: tutorials,Code example,hints
Thanks a lot.
Assuming you are using API11+, I think you will be well served by the “Action Bar with Tabbed Navigation” pattern. Google explains this pattern here, complete with example code.
If you need to support versions older than Honeycomb, you can do the same thing with ActionBarSherlock.
The basic idea is that you have a single activity with tabs that are automatically placed appropriately based on screen size. When a tab is hit, you can handle and respond by loading an appropriate Fragment into the content area of your app.