sts-saguenay-android/app/src/main/res/layout/nav_header_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
              android:layout_width="match_parent"
              android:layout_height="@dimen/nav_header_height"
              android:background="@drawable/side_nav_bar"
              xmlns:tools="http://schemas.android.com/tools"
              android:gravity="bottom"
              android:orientation="vertical"
              android:paddingBottom="@dimen/activity_vertical_margin"
              android:paddingLeft="@dimen/activity_horizontal_margin"
              android:paddingRight="@dimen/activity_horizontal_margin"
              android:paddingTop="@dimen/activity_vertical_margin"
              android:theme="@style/ThemeOverlay.AppCompat.Dark">

    <ImageView
        android:id="@+id/imageView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="@dimen/nav_header_vertical_spacing"
        android:src="@mipmap/ic_launcher" />

    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="@dimen/nav_header_vertical_spacing"
        android:id="@+id/textUserName"
        tools:text="Android Studio"
        android:textAppearance="@style/TextAppearance.AppCompat.Body1"
        android:visibility="gone"  />

    <TextView
        android:id="@+id/textUserEmail"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        tools:text="android.studio@android.com"
        android:visibility="gone" />

    <com.facebook.login.widget.LoginButton
        android:id="@+id/btnLogin"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="@dimen/nav_header_vertical_spacing"
        android:layout_gravity="center_horizontal" />

</LinearLayout>