onAudioDeviceChanged.kt

typealias OnAudioDeviceChanged = (
    selectedAudioDevice: AudioGenie.AudioDevice?,
    availableAudioDevices: Set<AudioGenie.AudioDevice>
) -> Unit

val newAudioDevices: MutableSet<AudioDevice> = HashSet()
if (bluetoothManager.state == State.SCO_CONNECTED || bluetoothManager.state == State.SCO_CONNECTING || bluetoothManager.state == State.HEADSET_AVAILABLE
) {
    newAudioDevices.add(AudioDevice.BLUETOOTH)
}
if (hasWiredHeadset) {
    // If a wired headset is connected, then it is the only possible option.
    newAudioDevices.add(AudioDevice.WIRED_HEADSET)
} else { 
    // No wired headset, hence the audio-device list can contain speaker // phone (on a tablet), or speaker phone and earpiece (on mobile phone).
    newAudioDevices.add(AudioDevice.SPEAKER_PHONE)
    if (hasEarpiece()) {
        newAudioDevices.add(AudioDevice.EARPIECE)
    }
}
// Store state which is set to true if the device list has changed.
var audioDeviceSetUpdated = audioDevices != newAudioDevices
// Update the existing audio device set.
audioDevices = newAudioDevices
…