According to https://www.xfinity.com/support/articles/xfinity-stream-beta-app-faqs and https://www.xfinity.com/support/articles/xfinity-tv-app-requirements , Android TV isn't supported.

You can try casting to it with the Xfinity stream app on your phone. I believe that works now.

AndroidTV will not support Xfinity as far as I am aware. I watch it all the time on my Nvidia Shield though via Steam Link. You can always use the Link to view your pc desktop and then navigate to Xfinity from your pc browser. This is not the most streamlined/sexy set up, but it gets the job done for me.

You can sideload a modified APK and have it work on most Android boxes/TVs, but as it requires a browser (for login) and a mouse (for use), it isn't ideal.

I really like the price and the picture on my hisense. The Android does not have a lot of memory though. My advice is get the tv where you like the picture best and then get an nvidia shield or some other device for fully functional Android. This bundling of is with the is just marketing gimmick. The tv is just an output device and shouldn't be locked in with hardware you can't update.

Xfinity stream wont work on android TV get a cheap roku box I have Xfinity and even if you find a hacked version of the Xfinity stream app it wont work for very long

Piggy backing a question here - you said your friend uses it on his Roku equipped TV and it is just like a regular cable box - does that mean UI is the same as the X1 DVR? that you have similar access to all DVR space etc (is it limited space?) and you can also order on demand? I am asking as I am moving next week into an Xfinity area and am still deciding between using YouTube TV on my Android TV systems or hooking up the Roku's and getting tv from Xfinity directly...

You can't do it, due to the fact they want you to rent the boxes and there's i guys licensing agreements for the software as well. Unless you sideload it, even then if you sideload it, it is super clunky.

Also go with sony, it is officially supported for more apps. Hisense, I'll put it this way, you'll get what you pay for. I've had my sony for almost 4 years and love it.

did you try AptiodeTV ? it could possibly work to install the tablet version.

Thanks for all the great info and ideas, everyone! I like the idea of going with the AndroidTV and just adding a Roku. Looks like the Roku Express is under $30 and this would give the best of both OS's. Be well, All!

Get the new Chromecast w/Google TV and sideload the xfinity stream app. It is not beta (5.3) like Roku, it is full release 6.2.2.

I just sideloaded Xfinity Stream on my Sony Android TV, and everytime I click Get Started after launching the app, it launches the Playstation Video app, which seems very weird. Any other experiences like this?

Get a Roku if you want a similar experience to using a X1 box/stand alone cable box. The app on Roku is good and works well with the Roku remote. If you want Android TV, you can cast from the Xfinity stream app, it works well, picture is on par with a standalone set top cable box. Otherwise, side loading a "hacked" version will work, but it's a little clunky without a mouse/game pad and not something I'd recommend if you're concerned about usability by others.