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Didn't get an answer to my last question, so perhaps I should just ask
it differently.
I'm trying to route preferably all audio but if that isn't possible only
TTS from my app through a bluetooth SCO earpiece. I'm aware that the
quality will be low but don't care in this instance.
I've dug around and have found the intents that are triggered when a
bluetooth headset changes state. I can't, however, ever get my app's
audio playing through the earpiece. I don't know what I'm doing here,
and am just trying a bunch of things that work. Likely, this solution
isn't complete, and I'm sure it needs to handle SCO connection failure,
but for the moment I'm just trying to get something working.
I have the following Scala code running when the earpiece
disconnects/reconnects. There are various niceties that aren't stock
Android, but hopefully it's plain what I'm doing.
if(on) {
actor {
// Wait 5 seconds in the background to see if an A2DP headset
connects first.
Thread.sleep(5000)
if(!audioManager.isBluetoothA2dpOn) {
TTS.stream = AudioManager.STREAM_VOICE_CALL
audioManager.setMode(AudioManager.MODE_IN_CALL) // Needed?
audioManager.setBluetoothScoOn(true) // How about this?
audioManager.startBluetoothSco() // And this? Do I need both
on and start?
}
}
} else if(!on) {
TTS.stream = AudioManager.STREAM_MUSIC
audioManager.setBluetoothScoOn(false)
audioManager.stopBluetoothSco()
audioManager.setMode(AudioManager.MODE_NORMAL)
}
The one possibility I thought of when I asked my last question was that
perhaps TTS audio is stereo and SCO specifically requires a mono stream,
which is why I asked about changing the stream format, but maybe someone
else has solved this problem and can point me in the right direction.
Clearly someone has, as there's a paid app on the market that does this,
but I'd very much like to fold this particular feature into my own app.
Android a11y is already a mess of "first install a screen reader, next
install the settings app, then install one or more additional
AccessibilityServices..." If I can avoid adding yet another app to my
own experience, which I've thus far kept consolidated to just a single
install, then that'd rock.
I'm really confused about the various SCO/A2DP methods in AudioManager.
What's the difference between setting SCO on and starting a connection?
Does the latter imply the former? The docs on this might need some work. :)
Thanks.
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