nav-drawer-header.axml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="178dp"
    android:background="?attr/colorPrimary"
    android:orientation="vertical"
    android:weightSum="1">
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="56dp"
        android:orientation="vertical"
        android:layout_alignParentBottom="true"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true">
        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginLeft="16dp"
            android:textColor="#ffffff"
            android:text="Medium - Navigation Drawer"
            android:textSize="14sp"
            android:textStyle="bold" />
        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textColor="#ffffff"
            android:layout_marginLeft="16dp"
            android:layout_marginTop="5dp"
            android:text="Adicionando o Navigation Drawer"
            android:textSize="14sp"
            android:textStyle="normal" />
    </LinearLayout>
</RelativeLayout>