Updating skip forwards/backwards icons in currently playing

CurrentlyPlayingViewModel.kt

    private var _jumpForwardsIcon = MutableLiveData(makeJumpForwardsIcon())
    val jumpForwardsIcon: LiveData<Int>
        get() = _jumpForwardsIcon

    private var _jumpBackwardsIcon = MutableLiveData(makeJumpBackwardsIcon())
    val jumpBackwardsIcon: LiveData<Int>
        get() = _jumpBackwardsIcon

    // this listener already exists, just add the KEY_JUMP lines
    private val prefsChangeListener = SharedPreferences.OnSharedPreferenceChangeListener { _, key ->
        when (key) {
            PrefsRepo.KEY_PLAYBACK_SPEED -> _speed.postValue(prefsRepo.playbackSpeed)
            // Add these \/ \/ \/
            PrefsRepo.KEY_JUMP_FORWARD_SECONDS -> _jumpForwardsIcon.value = makeJumpForwardsIcon()
            PrefsRepo.KEY_JUMP_BACKWARD_SECONDS -> _jumpBackwardsIcon.value = makeJumpBackwardsIcon()
        }
    }
    
    fun makeJumpForwardsIcon(): Int {
        return when (prefsRepo.jumpForwardSeconds) {
            10L -> R.drawable.ic_forward_10_white
            // TODO: finish this
            else -> R.drawable.ic_forward_30_white
        }
    }
    
    fun makeJumpForwardsIcon(): Int {
       TODO("finish this too")
    }

fragment_currently_playing.xml

android:src="@{viewModel.jumpBackwardsIcon}"