Aha! I figured it out. The other files I mentioned before that I had added were conflicting with the new files. It works now, thank you!

One more thing: How would I go about adding XBMC to the emulation station menu? The only current way to do it is to type “xbmc” into the console. It would be nice to have a GUI-based thing to make it prettier.

Thanks for the reply!

Nearly there… It’s now in emulationstation, but it seems there’s a permissions error on the xbmc.sh file. I’m getting an error:
sh: 1: home/pi/retropie/roms/apps/xbmc.sh: Permission Denied

The contents of the xbmc.sh file is exactly as you posted:

#!/bin/bash
sudo xbmc

Any ideas?

Yes, in fact, it is! And quite easy as well. You need to create a theme for XBMC. In /etc/emulationstation/themes/simple/ create a new folder called apps (or whatever you named your folder when adding start.sh). Inside that folder, create another folder (art) and an XML file called theme.xml. Here, you can copy and paste code from other themes. Here is my theme.xml if you are interested:

<theme>
    <formatVersion>3</formatVersion>
    <include>./../simple.xml</include>

	<view name="system">

		<image name="background" extra="true">
			<path>./art/XBMC_blur.png</path>
		</image>

		<image name="logo">
			<path>./art/XBMC_Logo.svg</path>
			<maxSize>0.90 0.2</maxSize>
        	</image>
		
		<helpsystem name="help">
			<textColor>ffffff66</textColor>
			<iconColor>ffffff66</iconColor>
		</helpsystem>
		
	</view>

	<view name="basic, detailed">
	
		<text name="system_name_1" extra="true">
			<text>XBMC</text>
			<forceUppercase>1</forceUppercase>
			<size>0.45 0.08</size>
			<pos>0.527 0.01</pos>
			<color>7b7d7f</color>
			<fontPath>./../art/OPENSANS-LIGHT.TTF</fontPath>
			<fontSize>0.055</fontSize>
			<alignment>right</alignment>
		</text>
		
		<text name="system_name_2" extra="true">
			<text>Media Center</text>
			<forceUppercase>0</forceUppercase>
			<size>0.45 0.08</size>
			<pos>0.527 0.07</pos>
			<color>7b7d7f</color>
			<fontPath>./../art/OPENSANS-LIGHT.TTF</fontPath>
			<fontSize>0.055</fontSize>
			<alignment>right</alignment>

		</text>

		<image name="logo">
			<path>./art/XBMC_Logo.svg</path>
			<pos>0.025 0.079</pos>
			<maxSize>0.90 0.2</maxSize>
			<origin>0 0.5</origin>
		</image>

	</view>

	<view name="basic">
	
		<textlist name="gamelist">
			<pos>0.025 0.22</pos>
			<size>0.950 0.68</size>
			<alignment>center</alignment>
			<horizontalMargin>0.01</horizontalMargin>
		</textlist>
		
	</view>

	<view name="detailed">
	
<!-- <measuring rectangle 
		<image name="measure" extra="true">
			<pos>0.025 0.6</pos>
			<origin>0 0</origin>
			<size>0.125 0.301</size>
			<path>./../art/white.png</path>
			<color>ff00ff</color>
		</image> 
-->

		<image name="md_image">
			<pos>0.025 0.22</pos>
<!-- 			<size>0.124 0.301</size>
 -->			<maxSize>0.124 0.301</maxSize>
			<origin>0 0</origin>
		</image>
		
		<text name="md_lbl_rating">
			<pos>0.176 0.21</pos>
		</text>
		
		<text name="md_lbl_releasedate">
			<pos>0.176 0.25</pos>
		</text>
		
		<text name="md_lbl_developer">
			<pos>0.176 0.29</pos>
			<size>0.133 0.04</size>
		</text>

		<text name="md_lbl_publisher">
			<pos>0.176 0.33</pos>
			<size>0.133 0.04</size>
			</text>
		
		<text name="md_lbl_genre">
			<pos>0.176 0.37</pos>
		</text>
		
		<text name="md_lbl_players">
			<pos>0.176 0.41</pos>
		</text>

		<text name="md_lbl_lastplayed">
			<pos>0.176 0.45</pos>
		</text>

		<text name="md_lbl_playcount">
			<pos>0.176 0.49</pos>
		</text>
		
		<text name="md_playcount">
			<pos>0.309 0.49</pos>
		</text>

		<datetime name="md_lastplayed">
			<pos>0.309 0.45</pos>
		</datetime>
		
		<text name="md_players">
			<pos>0.309 0.41</pos>
		</text>
		
		<text name="md_genre">
			<pos>0.309 0.37</pos>
			<size>0.24 0.04</size>
		</text>

		<text name="md_publisher">
			<pos>0.309 0.33</pos>
			<size>0.24 0.04</size>
		</text>
		
		<text name="md_developer">
			<pos>0.309 0.29</pos>
			<size>0.24 0.04</size>
		</text>
		
		<datetime name="md_releasedate">
			<pos>0.309 0.25</pos>
		</datetime>
		
		<rating name="md_rating">
			<pos>0.309 0.216</pos>
			<size>0.028 0.028</size>
			<filledPath>./../art/star_filled_spacing.svg</filledPath>
			<unfilledPath>./../art/star_hollow_3_spacing.svg</unfilledPath>
		</rating>
		
		<text name="md_description">
			<size>0.52 0.3</size>
			<pos>0.025 0.577</pos>
		</text>
		
		<textlist name="gamelist">
			<pos>0.615 0.22</pos>
			<size>0.359 0.68</size>
			<alignment>left</alignment>
			<horizontalMargin>0.01</horizontalMargin>
		</textlist>

	</view>

You can see that it links to a few other images in the art folder, XBMC_Blur and XBMC_Logo. The blur is the background image for the menu screen, and the logo (SVG) is for the apps folder logo. I have it slightly off positioned because I like the look of it, but you can change it if you want. You can probably find a vector logo online, if you don’t have it already, and you can choose whichever background you want in place of XBMC_blur.png. I have the default XBMC blue background.

What I had to do (if I remember correctly) is I had to visit the sources.list and sources.list.d places and remove any XBMC related entries. My original entries were invalid, and they were conflicting with shy wolf’s instructions.

But unless you ran the same incorrect commands as I, I doubt that’s your problem too. Would you mind posting what you’ve done so far, if removing the entries and using shy wolf’s instructions doesn’t work? Also, have you tried launching xbmc by running the xbmc command?

Let me know if you need anything else!