CUSTOM ELEMENT:

<?xml version="1.0" encoding="utf-8"?>
<com.github.ppamorim.lobato.view.text.FontAutoCompleteTextView
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/autoCompleteTextView_searchWidget"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:padding="5dp"
    app:font="Roboto-Light"
    android:textColor="@color/black"
    android:imeOptions="actionSearch"
    android:inputType="text">
    <requestFocus/>
</com.github.ppamorim.lobato.view.text.FontAutoCompleteTextView>

MENU:

<?xml version="1.0" encoding="utf-8"?>

<menu xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto">

    <item android:id="@+id/action_search"
        android:name="search"
        android:title="@string/search"
        android:imeOptions="actionSearch"
        android:inputType="textAutoComplete|textAutoCorrect"
        app:actionLayout="@layout/search_custom"
        android:icon="@drawable/ic_search"
        app:showAsAction="ifRoom|collapseActionView"/>

</menu>