Can I connect android through headphone jack to car stereo's USB? Basically I want to be able to stream music (Youtube / Spotify) from my smartphone to my car stereo. Android outputs audio from its headphones female jack and my car stereo has a female USB port. Could I use something like this http://www.ebay.ie/itm/USB-2-0-to-3-5mm-Jack-Audio-Aux-Plug-Cord-Headphone-Earphone-Cable-male-To-male-/302373272893?hash=item4666d9fd3d:g:BFYAAOSwxH1UKaBm to connect both?
Most likely not, but it depends on the technical details of the components in question.  Most importantly, Is the adapter simply a passthrough wiring change?  Or is it an active device that actually requires a USB host?



If it's a passthrough wiring change:


Does the car stereo accept analog audio from the USB jack?


It might, by internally disconnecting the USB hardware and connecting some line-input hardware instead.  Or it might not.





If it's an active device:

This is most likely the case because the description on eBay says it goes in a PC's USB jack, which I know is USB-only.

It probably announces itself as a USB soundcard, providing "speaker" and "microphone" capabilities to the PC.  In that case, there are two relevant questions:


Does the adapter have a "straight" pinout, or is it a "crossover"?


A straight pinout would be designed to plug into something that expects a phone on the other end, not into a phone itself.
A crossover would be designed to plug into a phone directly, but with the odd arrangement of a stereo mic/line-in and a mono speaker that is very quiet.  (basically a mirror-image of the phone's specs)

Does the car stereo even accept a USB soundcard?


Again, it might, but it may only accept a flash drive with audio files on it.



Technically, it might be possible to make a device that announces itself as a flash drive with one file on it and delivers a live stream as that file's "contents", in which case it might work with a flash-drive-only type of player.  But somehow that seems unlikely to me.