libs/editor/example/src/main/res/layout/activity_new_editor.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
                xmlns:tools="http://schemas.android.com/tools"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                tools:context=".EditorActivity">

    <fragment
        android:id="@+id/postEditor"
        android:name="org.wordpress.android.editor.EditorFragment"
        android:layout_width="match_parent"
        android:layout_height="match_parent"/>

</RelativeLayout>