getAvailableVoiceList

open fun getAvailableVoiceList(@NonNull callback: VoiceDownload.AvailableVoicesCallback)

Returns all available voices. The callback will be called on main thread.

open fun getAvailableVoiceList(@NonNull callback: VoiceDownload.AvailableVoicesCallback, @Nullable executor: Executor)

Returns all available voices. The callback will be called on provided executor or on main thread if null.