Да добавим малко shadow на TextView елемент:

<TextView
            android:id="@+id/header_text"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:shadowColor="#7F000000"
            android:shadowDx="1"
            android:shadowDy="1"
            android:shadowRadius="2"
            android:text="TEXT TO SHOW"
            android:textColor="#FBFBFB"
            android:textSize="14dp"
            android:gravity="center"
            android:textStyle="bold" />