So apparently the problem with the OP hearing aid is.
Yes it sometimes happens with devices, where a particular manufacturer might have an exclusivity agreement with Apple, $$$$, to ensure they only work with iOS.
It's known as vendor lock-in. Nobody else dare try to be compatible, because of Apple or exclusive device manufacturer lawsuits and cease-and-desist notices. And Apple has a huge legal department.
The original Nike+ Fuelband was Apple only. A third-party that did try to reverse engineer it were slapped with a cease-and-desist from Nike attorneys. I remember people were howling about it here on AF. Some car systems were like that as well. Some BMW owners weren't too happy about it I think, about their cars being tied to iPhones only.
See also:
https://en.wikipedia.org/wiki/Criticism_of_Apple_Inc.#Accusations_of_anti-competitive_behavior
He might want to check with the manufacturer I think, and if they say we only work with Apple, and not Samsung, Motorola etc. may have to change brand.
The FDA or FCC might have something to say about it, about device interoperability.
But from I've briefly found there certainly are hearing aids that will work with Android devices for streaming music, etc. So what you'd be specifically looking for is a device that supports the
Advanced Audio Distribution Profile (A2DP). Which is an industry wide agreed format for streaming HQ stereo audio between Bluetooth devices. And will work pretty much any smart-phone that has Bluetooth, like Apple, Android, Windows Phone and Blackberry, all seamlessly and no intermediately devices required.
It certainly sounds like the OP's hearing aid doesn't support A2DP, and only has the standard BT profiles for adjusting volume, etc. plus the Apple proprietary whatever it is. Because if it did have A2DP, it would work with Androids for streaming music no problem.
What make hearing aid actually is it? Because it could be worth hearing impaired Android users avoiding the thing.