I don't see the reason why you would want to communicate with headphones which are already supported in android, as well as USB storage.
Technically, you could with my fork, which includes the incomplete stubs for such extensions, to upload a sketch over bluetooth in SPP mode. I don't think you are understanding the actual use of this library, which is mainly to program a device, and interact with serial. Communication with anything ELSE is up to YOU.
I don't see the reason why you would want to communicate with headphones which are already supported in android, as well as USB storage.
Technically, you could with my fork, which includes the incomplete stubs for such extensions, to upload a sketch over bluetooth in SPP mode. I don't think you are understanding the actual use of this library, which is mainly to program a device, and interact with serial. Communication with anything ELSE is up to YOU.