Bluetooth is connected, but userSelectedDevice is still the one I set before, so the sound is always playing from the previously selected route.

This sentence means that I previously selected the speaker, so userSelectedDevice is the speaker. Then when I connect Bluetooth, selectedDevice keeps returning my previous setting, which prevents me from connecting Bluetooth.

` private fun enumerateDevices(bluetoothHeadsetName: String? = null) { // save off the old state and 'semi'-deep copy the list of audio devices val oldAudioDeviceState = AudioDeviceState(mutableAudioDevices.map { it }, selectedDevice) // update audio device list and selected device addAvailableAudioDevices(bluetoothHeadsetName)

    if (!userSelectedDevicePresent(mutableAudioDevices)) {
        userSelectedDevice = null
    }

    // Select the audio device
    logger.d(TAG, "Current user selected AudioDevice = $userSelectedDevice")
    selectedDevice = if (userSelectedDevice != null) {//always not null。。。。
        userSelectedDevice
    } else if (mutableAudioDevices.size > 0) {
        val firstAudioDevice = mutableAudioDevices[0]
        /*
         * If there was an error starting bluetooth sco, then the selected AudioDevice should
         * be the next valid device in the list.
         */
        if (firstAudioDevice is BluetoothHeadset &&
                bluetoothHeadsetManager?.hasActivationError() == true) {
            mutableAudioDevices[1]
        } else {
            firstAudioDevice
        }
    } else {
        null
    }

    // Activate the device if in the active state
    if (state == ACTIVATED) {
        activate()
    }
    // trigger audio device change listener if there has been a change
    val newAudioDeviceState = AudioDeviceState(mutableAudioDevices, selectedDevice)
    if (newAudioDeviceState != oldAudioDeviceState) {
        audioDeviceChangeListener?.invoke(mutableAudioDevices, selectedDevice)
    }
}

twilio / audioswitch

Bluetooth is connected, but userSelectedDevice is still the one I set before, so the sound is always playing from the previously selected route. #156