CourseDetails.java

public void selectTab(int itemPosition) {
        //hide whatever was previously showing
        hideCurrentFragment();

        currentTab = availableTabs.get(itemPosition);

        //haven't determined where to go yet
        if (currentTab == null) {
            return;
        }

        //set animation here
        showFragment(tabFragments.get(currentTab.getLabel()));
    }

    private void showDefaultTab() {
        //create fragments
        createFragments();
        try {
            selectTab(getString(R.string.home));
        } catch (IndexOutOfBoundsException e) {
            //catch this exception, and keep navigation item
            //null if we don't have any tabs
            hideLoadingMessages();
            showErrorMessage();

            //kick them off the current fragment
            hideCurrentFragment();
            currentTab = null;
        }

        //if the list has where we want to go
        if (availableTabs.contains(currentTab)) {
            hideLoadingMessages();
        }
    }