player1.kt

@Composable
fun VideoPlayer() {
    // 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(context) {
        SimpleExoPlayer.Builder(context).build().apply {
            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
                    "https://commondatastorage.googleapis.com/gtv-videos-bucket/sample/BigBuckBunny.mp4"
                ))

            this.prepare(source)
        }
    }
}