Android: two activities, one tab?

The only solution I found is still replacing the view, but doing it through ActivityGroup, so the code would still look normally and would be separated in activities. Works great, but there still is needs for hacks like back button press and stuff. Scrapped this idea, though, since later I wanted more flexible and more stylish tab bar, so I wrote my own.

Works like a charm and took some 2 working days to code.