Yep, i'm also interested in this...

Also how to detect when a bluetooth headset device is being paired and
connected with the phone.

Actually i started this conversation:

http://groups.google.com/group/android-developers/browse_thread/thread/a4dda4e7f905a383


On Dec 24 2009, 10:08 pm, Doug <[email protected]> wrote:
> This could be considered a bump, as my previous post (regarding audio
> on 1.6 never got a response - 
> seehttp://groups.google.com/group/android-developers/browse_thread/threa...
> ) never got a response.
>
> In Android 1.5 we had the ability to route audio to any of the
> available output devices - Speaker, Earpiece, WiredHeadset,Bluetooth
> A2DP.
>
> In Android 1.6 the Android team made things more difficult, but it was
> still possible (there were comments about a re-write of the
> Audio subsystem)
>
> In Android 2.0 the workarounds for 1.6 stopped working, and comments
> in the source/documentation indicated "thou shalt call these alternate
> methods" - the alternate methods didn't seem to work properly and only
> gave access to a subset of available devices.
>
> I have just downloaded the latest source and can now see why the "new"
> methods don't work properly for me - they themselves seem to have been
> deprecated and are just stubs that do nothing.  I also note that the
> documentation has also been updated to indicate these methods are no
> longer viable.
>
> So my question is this: Is there *any* way in Android 2.x for an
> application to request that audio be routed to a given audio sink.
> Specifically, if I want to route audio to Speaker OR Earpiece OR 
> WiredHeadset(if available) ORBluetoothA2DP (if available) -- can I do
> it?
>
> I'd be interested to hear if Google Voice still allows switching
> voicemail playback from Speaker to Earpiece on Android 2.x devices
> (the Verizon Droid for example).
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