ClearBackStack.java

    /**
     * Remove all entries from the backStack of this fragmentManager.
     * 
     * @param fragmentManager the fragmentManager to clear.
     */
    private void clearBackStack(FragmentManager fragmentManager) {
        if (fragmentManager.getBackStackEntryCount() > 0) {
            FragmentManager.BackStackEntry entry = fragmentManager.getBackStackEntryAt(0);
            mFragmentManager.popBackStack(entry.getId(), FragmentManager.POP_BACK_STACK_INCLUSIVE);
        }
    }