Никак не меняется размер текста.
drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
this, drawer, toolbar, R.string.app_name, R.string.app_name);
drawer.addDrawerListener(toggle);
toggle.syncState();
navigationView = (NavigationView) findViewById(R.id.nav_view);
navigationView.setNavigationItemSelectedListener(this);
setupHeaderInfo();
и
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/titleContainer"
android:layout_width="match_parent"
android:layout_height="48dp"
android:background="@drawable/list_selector">
<TextView
android:id="@+id/title"
android:layout_width="fill_parent"
android:layout_height="match_parent"
android:layout_alignParentLeft="true"
android:minHeight="?android:attr/listPreferredItemHeightSmall"
android:textAppearance="?android:attr/textAppearanceListItemSmall"
android:textColor="@drawable/list_item_color"
android:gravity="center_vertical"
android:paddingRight="10dp"
android:paddingLeft="10dp"/>
</RelativeLayout>