player4.kt

@Composable
fun VideoPlayer(sourceUrl: String) {
    // This is the official way to access current context from Composable functions
    val context = LocalContext.current

    // Do not recreate the player everytime this Composable commits
    val exoPlayer = remember {
        SimpleExoPlayer.Builder(context).build()
    }

    // We only want to react to changes in sourceUrl.
    // This effect will be executed at each commit phase if
    // [sourceUrl] has changed.
    LaunchedEffect(sourceUrl) {
        val dataSourceFactory: DataSource.Factory = DefaultDataSourceFactory(context,
            Util.getUserAgent(context, context.packageName))

        val source = ProgressiveMediaSource.Factory(dataSourceFactory)
            .createMediaSource(Uri.parse(
                // Big Buck Bunny from Blender Project
                sourceUrl
            ))

        exoPlayer.prepare(source)
    }

    // Gateway to traditional Android Views
    AndroidView(
        viewBlock = { context ->
            PlayerView(context).apply {
                player = exoPlayer
                playWhenReady = true
            }
        }
    )
}