Hi Nick,
Supporting connection to a single device can be understood. I
want to expand the topic a bit, related to multiple connections to a
same device. For example, cupcake already supports A2DP and HFP
connection to a same headset in concurrent way, although audio data
(A2DP/SCO) need be switched depending on call state. However,
framework code to control such concurrency is weak and cupcake depends
on applications to handle them properly, like in mediaplaybackservice
and BluetoothHandsfree. Are there any plan to support audio switch
from framework level?
The reason is because cupcake does not implement the
recommendation as from the "Bluetooth White Paper Simultaneous use of
HFP, A2DP, and AVRCP profiles" (url:
https://www.bluetooth.org/docman/handlers/DownloadDoc.ashx?doc_id=49216).
Current A2DP->SCO switch has a limitation depending on other side
interoperating capability - for incoming call case suppose headset
could not echo "A2DP data to close" signal back to phone, I guess A2DP
data channel becomes a unknown state along with SCO being setup. So
during a call in case user still tries to launch music player, effect
depends on hardware implementation of two sides.
Also suppose later people want to add more profiles,
concurrency need be controlled otherwise data flow competing will
threaten overall quality. I do not know whether you plan to add Qos
mechanism when multiple data related profiles being active, like DUN,
OPP, PBAP, A2DP, PAN, etc? Although conflicting cases may be rare, I
know some carkits can make calls or listening to music while
transferring phonebook entries (via OBEX) via Bluetooth.
Jackson
On Apr 3, 4:47 am, Nick Pelly <[email protected]> wrote:
> On Wed, Apr 1, 2009 at 7:57 AM, vishy <[email protected]> wrote:
>
> > Hi ,
>
> > During our initial testing with Android Phones(Using Cupcake build) we
> > noticed that the phone connects to more than one BT HF device.Can
> > anyone share some information on the number of devices Android phones
> > can connect to via Bluetooth!
>
> > Like ,can we connect Phone A to HFP only Headset and PhoneA to A2DP
> > only Headset,simultaneously!
>
> > If multiple connections are supported,what would be the criteria on
> > which it
> > is done!
>
> Have you tried reading the javadoc in BluetoothHeadset.java or
> BluetoothA2dp.java ?
>
> Nick
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