Add fontawesome icons in my toolbar items menu

Question

I'm trying to add Font Awesome library to my android project but i just can't. I was reading each google result about this topic.

My menu.xml

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android">
    <item
        android:id="@+id/buzon"
        android:icon="@drawable/ic_buzon"
        android:title="@string/buzon" />

    <item
        android:id="@+id/objetivos"
        android:icon="@drawable/ic_objetivos"
        android:title="@string/objetivos" />


    <item
        android:id="@+id/home_action"
        android:icon="@drawable/ic_go_home"
        android:title="@string/title_home" />

    <item
        android:id="@+id/encuesta"
        android:icon="@drawable/ic_encuesta"
        android:title="@string/encuesta" />

    <item
        android:id="@+id/cursos"
        android:icon="@drawable/ic_cursos"
        android:title="@string/cursos" />

</menu>

I'm want to use Font Awesome icons in my items menu instead default android icons.

For references, i was trying to follow this guide without success.

How to use Font Awesome icon in android application?