I have a complex layout, part of which features a value centered over a label, with + and - buttons on either side of the value. I want the value to center between the buttons, whether it is "1" or "99". It looks fine when it's a 2-digit number like "99", but when it's a single digit the number is left-justified. How do I properly center that value?

Here's the portion of my layout that does this:

            <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_above="@id/runway_label"
            android:layout_centerHorizontal="true"
            android:orientation="horizontal">
            <ImageView android:id="@+id/dec_runway_button" android:src="@drawable/minus_button"
                android:layout_width="wrap_content" android:layout_height="wrap_content"
                android:layout_gravity="center_vertical"/>
            <TextView android:id="@+id/runway_value"
                android:layout_width="wrap_content" android:layout_height="wrap_content"
                android:textColor="#FFFFFF"
                android:textStyle="bold" android:textSize="40.0sp"
                android:minWidth="50sp"
                android:layout_centerInParent="true"
                android:layout_gravity="center"
                android:shadowColor="#333333" android:shadowDx="2.0"
                android:shadowDy="2.0" android:shadowRadius="3.0" />
            <ImageView android:id="@+id/inc_runway_button" android:src="@drawable/plus_button"
                android:layout_width="wrap_content" android:layout_height="wrap_content"
                android:layout_gravity="center_vertical"/>
        </LinearLayout>