Android RadioGroup center custom images, keeping aspect ratio, with constant spacing between them

Android RadioGroup Cheat Sheet

This lets you space out your radio buttons to have a constant space between them while keeping the aspect ratio of an image 

<RadioGroup
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:orientation="horizontal">

                <RadioButton
                    style="@style/radio_button_transport"
                    android:background="@drawable/transport_mode_button_foot"/>

                <Space
                    style="@style/radio_button_spacer" />

                <RadioButton
                    style="@style/radio_button_transport"
                    android:background="@drawable/transport_mode_button_bicycle"/>

                <Space
                    style="@style/radio_button_spacer" />

                <RadioButton
                    style="@style/radio_button_transport"
                    android:background="@drawable/transport_mode_button_scooter"/>

                <Space
                    style="@style/radio_button_spacer" />
                <RadioButton
                    style="@style/radio_button_transport"
                    android:background="@drawable/transport_mode_button_car"/>

                <Space
                    style="@style/radio_button_spacer" />

                <RadioButton
                    style="@style/radio_button_transport"
                    android:background="@drawable/transport_mode_button_truck"/>


            </RadioGroup>


	<!-- Styles -->
	
   <style name="radio_button_spacer">
        <item name="android:layout_width">0dp</item>
        <item name="android:layout_height">match_parent</item>
        <item name="android:layout_weight">1</item>
    </style>

    <style name="radio_button_transport">
        <item name="android:layout_width">wrap_content</item>
        <item name="android:layout_height">wrap_content</item>
        <item name="android:button">@null</item>
    </style>
    
    <!-- Example background file -->
    <selector xmlns:android="http://schemas.android.com/apk/res/android">
    	<item android:state_checked="true" android:drawable="@drawable/settings_transport_mode_bicycle_active" />
    	<item android:drawable="@drawable/settings_transport_mode_bicycle" />
		</selector>