Direction Provider and internal class

DirectionProvider.kt

interface DirectionProvider {
    fun start()
    fun stop()
    fun destroy()
}

internal class HuaweiVoiceProvider(
    private val context: Context,
    private val voiceDirectionExtractor: VoiceDirectionExtractor,
    private val onDirectionListener: (direction: Direction) -> Unit,
) : MLAsrListener, DirectionProvider

internal class VoiceProvider(
    context: Context,
    private val voiceDirectionExtractor: VoiceDirectionExtractor,
    private val onDirectionListener: (direction: Direction) -> Unit
) : RecognitionListener, DirectionProvider