Android ListView with RadioButton in singleChoice mode and a custom row layout

I have a ListView, which is in single-choice mode. All I want is to display a RadioButton to the side, that when clicked highlights to say it is selected, and when a different one is clicked that one goes back to unselected and the new one becomes selected. Why is this so hard? This should not be this complicated. I've spent DAYS looking for an appropriate answer to this and I have found nothing, so I'm asking hopefully clearly and concisely.

My layout for the listview (R.layout.view_orders):

<?xml version="1.0" encoding="utf-8"?>
<ListView 
        android:choiceMode="singleChoice"
        android:id="@android:id/list"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:divider="@drawable/list_divider"
        android:dividerHeight="1px"
        android:focusable="false"
        android:focusableInTouchMode="false"
        android:cacheColorHint="#00000000">
</ListView>

My custom row (R.layout.orders_row):

<?xml version="1.0" encoding="utf-8"?>
    
<RelativeLayout
    xmlns:app="http://schemas.android.com/apk/res/com.xxx.xxxxxx"
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:orientation="horizontal"
    android:padding="6dip">
    
    <com.xxx.xxxxxx.VerticalLabelView
        app:text="SHORT"
        app:textColor="#666"
        app:textSize="14sp"
        android:id="@+id/state"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_