gistfile1.txt

    private Fragment getVitrine() {
        if (!mFragments.containsKey(mFragmentTypes.VITRINE)) {
            mFragments.put(mFragmentTypes.VITRINE,mFragmentTypes.VITRINE.getFragment());
        }
        return mFragments.get(mFragmentTypes.VITRINE);
    }

myEnum.java

    public enum mFragmentTypes {
        VITRINE {
            @Override
            public Fragment getFragment() {
                return VitrineFragment.newInstance();
            }
        },

        MY_BOOKS {
            @Override
            public Fragment getFragment() {
                return new MyBooksFragment();
            }
        },

        A_TEMATICAS {
            @Override
            public Fragment getFragment() {
                return new AreasTematicasFragment();
            }
        },

        ABOUT {
            @Override
            public Fragment getFragment() {
                return new AboutFragment();
            }
        };

        public abstract Fragment getFragment();
    }

NavigationView.java

    @Override
    public boolean onNavigationItemSelected(MenuItem menuItem) {
        Fragment fragment = null;
        boolean shouldChange = true;

        switch(menuItem.getItemId()) {
            case R.id.drawer_home:
                if (menuItem.isChecked()) shouldChange = false;
                else {
                    fragment = getVitrine();
                    prepareForTabs(false);
                    menuItem.setChecked(true);
                }
                break;
            case R.id.drawer_mybooks:
                if (menuItem.isChecked()) shouldChange = false;
                else {
                    fragment = getMyBooks();
                    prepareForTabs(true);
                    menuItem.setChecked(true);
                }
                break;
            case R.id.drawer_aTematicas:
                if (menuItem.isChecked()) shouldChange = false;
                else {
                    fragment = getATematicas();
                    prepareForTabs(false);
                    menuItem.setChecked(true);
                }
                break;
            case R.id.drawer_about:
                if (menuItem.isChecked()) shouldChange = false;
                else {
                    fragment = getAbout();
                    prepareForTabs(false);
                    menuItem.setChecked(true);
                }
                break;
            case R.id.drawer_exit:
                // TODO - Prompt to exit.
                finish();
                break;
            default:
                fragment = getVitrine();
                break;
        }

        if (fragment == null) {
            fragment = getVitrine();
        }

        drawerLayout.closeDrawers();

        if (shouldChange) {
            changeFragment(fragment);
        }

        return true;
    }