Hi I m showing countdown timer on ui served from viewModel `

Question

Hi I m showing countdown timer on ui served from viewModel `MVI state` ```data class VideoState val currentTime Long val totalTime Long val title String ``` `UI Fragment ` ```renderData state VideoState binding timerTextView text = $state currentTime binding durationTextView text = $state totalTime binding title = $state title ``` only `timerTextView` will update but `durationTextView` amp `title` will remain same still `renderData` will set everything Is there any performance again if we want to update part of the view If so whats the better to do that Hoping for a `onBindViewHolder` with `payload` kind of <https developer android com reference androidx recyclerview widget RecyclerView Adapter notifyItemChanged int 20java lang Object |approach>

Ravi · Answer

I ve checked <https github com orbit mvi orbit mvi blob main samples orbit posts src main kotlin org orbitmvi orbit sample posts app features postdetails viewmodel PostDetailsViewModel kt|PostDetailsViewModel> please let me know if below approach is correct or not ```data class VideoData val url String = val title String = val isPlaying Boolean = false val totalDuration Long = 0L sealed class VideoState abstract val videoData VideoData data class VideoMeta override val videoData VideoData VideoState data class VideTimer val currentTime Long override val videoData VideoData VideoState class VideoViewModel private val someSubject SomeSubject private val someRepo SomeRepo ViewModel ContainerHost lt VideoState Nothing gt override val container by lazy container lt VideoState Nothing gt initialState = VideoState VideoMeta VideoData initData private fun initData = intent val videoData VideoData = someRepo fetchVideoMeta reduce with videoData VideoState VideoMeta state videoData copy url = url title = title totalDuration = totalDuration repeatOnSubscription val timer Long = someSubject listentoTimer reduce VideoState VideTimer currentTime = timer videoData = state videoData class VideoFragment Fragment fun renderData state VideoState when state is VideoState VideTimer gt binding timerTv text = $ state currentTime is VideoState VideoMeta gt with state videoData binding titleTv text = $title binding totalTv text = $totalDuration binding playIcon background = if isPlaying playIcon else pauseIcon ```