I guess I'm gonna answer my question. The latest navigationView produces its default android:layout_height at almost 18dp when you choose "wrap_content". So, you must choose the android:layout_height that you want for your navigationView or simply make android:layout_height="match_parent".
<android.support.design.widget.NavigationView
android:layout_width="320dp"
android:layout_height="550dp"
android:id="@+id/navigation_view_admin"
android:layout_gravity="start">
</android.support.design.widget.NavigationView>
Anyways, it's height automatically increases when you add an item in the navigation drawer.
Lastly, Use addDrawerListener() instead of setDrawerListener() as Luxi Liu said.