As I'm aware, in Android, when you connect an USB audio device this automatically replace internal audio device, but when a Bluetooth audio headset is connected, you can select between Bluetooth, Speaker or earpiece (as in the Phone app). It is possible to simultaneously use in an application Bluetooth audio and internal phone audio(or USB audio if connected) and make a duplex or semi-duplex bridge between them? How can I manually select in my application between internal audio and Bluetooth audio?
Thank you.
