I have an `Activity` and it has only one `Fragment`. I want to handle `backpressed` functionality. When user presses back, program should go back to `Activity`. I know this is very simple but I have tried some solutions that are mentioned on Stackoverflow, but none of them worked. For example I tried this:

```
public void onBackPressed() {
int count = getFragmentManager().getBackStackEntryCount();

    if (count == 0) {
        super.onBackPressed();
        //additional code
    } else {

        getFragmentManager().popBackStack();
    }
}

```