removing nested fragments

gistfile1.java

//  Activity  -  Back button

    @Override
    public boolean dispatchKeyEvent(KeyEvent event) {
        int keyCode = event.getKeyCode();
        if ((keyCode == KeyEvent.KEYCODE_BACK)) {
            if (event.getAction() == KeyEvent.ACTION_UP) {
                if (menuDrawer.isDrawerOpen(Gravity.START)) {
                    menuDrawer.closeDrawers();
                } else {
                    closePage(null, null);
                    if(mRootPageFragment.isDetached()){
                        finish();
                    }
                }

            }
            return true;
        }
        return super.dispatchKeyEvent(event);
    }

    public void closePage(PageFragment closePage, String closeTo) {
        mRootPageFragment.closeLastPage(closePage, closeTo);
    }
    
    
// Drawer which is the mRootPageFragment

    @Override
    public String closeLastPage(PageFragment closePage, String closeTo) {

        PageFragment parentPage = null;

        if(mFragDeck.size() > 0) {
            PageFragment lastPage = mFragDeck.getLast();

            if (!StringUtils.isEmpty(closeTo)) {
                Iterator<PageFragment> it = mFragDeck.descendingIterator();
                while (it.hasNext()) {
                    PageFragment candidate = it.next();
                    if (StringUtils.equals(closeTo, candidate.getPageName())) {
                        parentPage = candidate;
                        break;
                    }
                }
            }
            if (closePage == null || closePage == lastPage) {
                if(lastPage instanceof LigerNavigatorFragment){
                    lastPage.closeLastPage(closePage, closeTo);
                }else {
                    FragmentTransaction ft = mContext.getSupportFragmentManager().beginTransaction();
                    ft.setCustomAnimations(R.anim.slide_in_left, R.anim.slide_out_right);
                    mFragDeck.removeLast();
                    lastPage.doPageClosed();
                    ft.remove(lastPage);
                    if (parentPage == null) {
                        if (mFragDeck.size() > 0) {
                            parentPage = mFragDeck.getLast();
                        }
                    } else {
                        popTo(ft, parentPage);
                    }
                    String parentUpdateArgs = lastPage.getParentUpdateArgs();
                    if (parentPage != null) {
                        parentPage.setChildArgs(parentUpdateArgs);
                        parentPage.doPageAppear();
                        ((DefaultMainActivity) getActivity()).setActionBarTitle(parentPage.getPageTitle());
                    }
                    ft.commit();
                }

                logStack("closeLastPage");
            } else {
                lastPage.closeLastPage(closePage, closeTo);
            }


        }
        if(mFragDeck.size() == 0 || (mFragDeck.size() == 1 && !mFragDeck.getLast().isDetached())){
            FragmentTransaction ft = mContext.getSupportFragmentManager().beginTransaction();
            ft.remove(this);
            ft.commit();
        }
        return parentPage == null ? null : parentPage.getPageName();
    }
    
    
//  Navigator Which is contained in the drawer frag deck

    @Override
    public String closeLastPage(PageFragment closePage, String closeTo) {
        PageFragment parentPage = null;
        if(mFragDeck.size() > 0) {
            PageFragment lastPage = mFragDeck.getLast();
            if (!StringUtils.isEmpty(closeTo)) {
                Iterator<PageFragment> it = mFragDeck.descendingIterator();
                while (it.hasNext()) {
                    PageFragment candidate = it.next();
                    if (StringUtils.equals(closeTo, candidate.getPageName())) {
                        parentPage = candidate;
                        break;
                    }
                }
            }
            if(closePage == null || closePage == lastPage) {
                FragmentManager fm = getFragmentManager();
                FragmentTransaction ft = fm.beginTransaction();
                ft.setCustomAnimations(R.anim.slide_in_left, R.anim.slide_out_right);
                mFragDeck.removeLast();
                lastPage.doPageClosed();
                ft.remove(lastPage);
                if (parentPage == null) {
                    if (mFragDeck.size() > 0) {
                        parentPage = mFragDeck.getLast();
                    }
                } else {
                    popTo(ft, parentPage);

                }
                String parentUpdateArgs = lastPage.getParentUpdateArgs();
                if (parentPage != null) {
                    parentPage.setChildArgs(parentUpdateArgs);
                    parentPage.doPageAppear();
                    ((DefaultMainActivity) getActivity()).setActionBarTitle(parentPage.getPageTitle());
                }
                ft.commit();

                logStack("closeLastPage");
            }
        }
        if(mFragDeck.size() == 0){
            FragmentTransaction ft = mContext.getSupportFragmentManager().beginTransaction();
            ft.remove(this);
            ft.commit();
        }
        return parentPage == null ? null : parentPage.getPageName();
    }