Centered textview does not appear in RelativeLayout

[postlink] https://the-best-way-of-life-is-islam.blogspot.com/2015/07/centered-textview-does-not-appear-in.html [/postlink]

I have a TextView, which I need to be centered horizontally and vertically inside a square. To do this, I have put it inside a RelativeLayout:

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
    xmlns:android="http://ift.tt/nIICcg"
    android:layout_height="match_parent"
    android:layout_width="match_parent"
    android:background="#fff"
    >

    <TextView
        android:id="@+id/centered_text_view_text"
        android:layout_centerInParent="true"
        android:text="test"
        android:background="#00ff00"
        android:textColor="#000"
        android:textSize="16dp"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        />

</RelativeLayout>

I instantiate the RelativeLayout with a LayoutInflater and then call the layout method on the RelativeLayout to position it where I need it.

        LayoutInflater inflater = Helpers.getInflater();
        containerLayout = (RelativeLayout) inflater.inflate(R.layout.centered_text_view, null);
        textView = (TextView) containerLayout.findViewById(R.id.centered_text_view_text);
        ... (later in the code)
        containerLayout.layout(dayLeft, weekTop, dayRight, weekBottom);

My problem is that the TextView is not visible. I can see the white background for the RelativeLayout, but neither the text nor the background for the TextView.

I have also tried getting rid of the RelativeLayout and calling the layout method on the TextView. I haven't been able to get this to work, however, because the text is only horizontally, and not vertically, aligned after I set the gravity on the TextView.