How can I create sections on my app? [ANDROID] : I want to improve my new app so I have question for you. How can I make sections in my app, in Navigation Drawer? 

[There's a photo if you don't understand what's in my mind. This photo is from Google Play][1]


  [1]: http://i.stack.imgur.com/65r7O.png

There's my activity_main_drawer.xml

    <?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android">

    <group android:checkableBehavior="single">
        <item
            android:id="@+id/nav_pagrindinis"
            android:icon="@drawable/ic_menu_pagrindinis"
            android:title="Pagrindinis" />
        <item
            android:id="@+id/nav_soctinklai"
            android:icon="@drawable/ic_menu_soctinklai"
            android:title="Gimnazijos socialiniai tinklai" />
        <item
            android:id="@+id/nav_dienynas"
            android:icon="@drawable/ic_menu_dienynas"
            android:title="El. dienynas" />
        <item
            android:id="@+id/nav_naudingosnuor"
            android:icon="@drawable/ic_menu_naudingosnuor"
            android:title="Naudingos nuorodos"/>
        <item
            android:id="@+id/nav_kontaktai"
            android:icon="@drawable/ic_menu_kontaktai"
            android:title="Kontaktinė informacija" />
    </group>

</menu>

And there's an excerpt from MainActivity.java

    @Override
    public boolean onNavigationItemSelected(MenuItem item) {
        // Handle navigation view item clicks here.
        int id = item.getItemId();

        if (id == R.id.nav_pagrindinis) {
            //Set the fragment initially
            PagrindinisFragment fragment = new PagrindinisFragment();
            android.support.v4.app.FragmentTransaction fragmentTransaction =
                    getSupportFragmentManager().beginTransaction();
            fragmentTransaction.replace(R.id.fragment_container, fragment);
            fragmentTransaction.commit();
            // Handle the camera action
        } else if (id == R.id.nav_soctinklai) {
            //Set the fragment initially
            SocTinklaiFragment fragment = new SocTinklaiFragment();
            android.support.v4.app.FragmentTransaction fragmentTransaction =
                    getSupportFragmentManager().beginTransaction();
            fragmentTransaction.replace(R.id.fragment_container, fragment);
            fragmentTransaction.commit();

        } else if (id == R.id.nav_dienynas) {

            Intent i = new Intent(Intent.ACTION_VIEW);
            i.setData(Uri.parse("https://sistema.tamo.lt"));
            startActivity(i);

        } else if (id == R.id.nav_naudingosnuor) {

        } else if (id == R.id.nav_kontaktai) {

            KontaktaiFragment fragment = new KontaktaiFragment();
            android.support.v4.app.FragmentTransaction fragmentTransaction =
                    getSupportFragmentManager().beginTransaction();
            fragmentTransaction.replace(R.id.fragment_container, fragment);
            fragmentTransaction.commit();
        }

        DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
        drawer.closeDrawer(GravityCompat.START);
        return true;
    }

I want to make section in this place

    android:id="@+id/nav_naudingosnuor"

Thanks for your support, mates! :)