Is there a way to make an Android phone (HTC Desire HD) act as Bluetooth speakers or headset?
I'd like to use the phone as wireless headphones whilst watching a movie on a computer (running Ubuntu).
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As of Feb 2011, the Bluetooth API only supports pairing with the Android device as the master.
Here's a XDA article by Mishaal Rahman that basically says:
Even without A2DP profile on Android (which is not implemented even in Android 8 yet), you can do a low-quality Bluetooth streaming via Hands-free Profile (HFP) to Android from another Android phone (sorry iPhone owners!)
Profile: Reroute Audio (192) State: BT Connected [ Name:BMW 15384 Address:* ] Enter: Anon (199) A1: AutoVoice Ctrl BT [ Configuration:Enabling Headset Sound Timeout (Seconds):0 ] Exit: Anon (204) A1: AutoVoice Ctrl BT [ Configuration:Disabling Headset Sound Timeout (Seconds):0 ]
Warning: I have not tested this myself.
Warning: quotation about HFP audio quality:
Note: because the Hands-Free Profile is not meant to send high-fidelity audio streams, the audio quality of your music will suffer. This is just the nature of the Hands-Free Profile and there’s nothing you can do about it without either upgrading your stereo’s Bluetooth to bring A2DP support or to stream through another peripheral.
I must be missing something, why do you want the phone to do it?
You'd be better off using a USB Bluetooth chip (they cost less than £5) on your PC and a Bluetooth Headset (I've got a superb one that lets me plug in any headphones I want, 3.5 stereo jack so would take any little speakers as well).