WordPress/src/main/res/layout/toolbar.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.Toolbar
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/toolbar"
    android:layout_width="match_parent"
    android:layout_height="?attr/actionBarSize"
    android:background="?attr/colorPrimary"
    android:elevation="@dimen/appbar_elevation"
    app:contentInsetLeft="@dimen/toolbar_content_offset"
    app:contentInsetStart="@dimen/toolbar_content_offset"
    app:popupTheme="@style/ThemeOverlay.AppCompat.Light"
    app:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"
    tools:targetApi="LOLLIPOP">

    <org.wordpress.android.widgets.WPTextView
        android:id="@+id/toolbar_title"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="start|center_vertical"
        android:visibility="gone"
        android:textColor="@color/white"
        android:textStyle="bold"
        android:textSize="@dimen/text_sz_extra_large"
        android:fontFamily="sans-serif-light" />

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