ProductTester/app/src/main/res/layout/page_2.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <android.support.v7.widget.Toolbar
        android:id="@+id/toolbar"
        android:layout_width="match_parent"
        android:layout_height="?attr/actionBarSize"
        android:background="@color/colorPrimary">

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="?attr/actionBarSize"
            android:background="@color/colorPrimary"
            android:gravity="center_vertical"
            android:orientation="horizontal">

            <com.joanzapata.iconify.widget.IconTextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="{fa-home 20sp}"
                android:textColor="#FFFFFF" />

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginStart="4dp"
                android:layout_marginLeft="4dp"
                android:text=""
                android:textColor="#FFFFFF"
                android:textSize="18sp" />

        </LinearLayout>

    </android.support.v7.widget.Toolbar>

</android.support.constraint.ConstraintLayout>