How can you implement an item separator in a list using RecyclerView?

To add a separator between list items in RecyclerView, the DividerItemDecoration class is usually used.

Example of adding a separator:

val recyclerView: RecyclerView = findViewById(R.id.recyclerView)
recyclerView.layoutManager = LinearLayoutManager(this)

// Add a standard separator
val dividerItemDecoration = DividerItemDecoration(recyclerView.context, LinearLayoutManager.VERTICAL)
recyclerView.addItemDecoration(dividerItemDecoration)

If a custom separator is needed, you can create your own Drawable and pass it to DividerItemDecoration:

val divider = ContextCompat.getDrawable(this, R.drawable.custom_divider)
val dividerItemDecoration = DividerItemDecoration(recyclerView.context, LinearLayoutManager.VERTICAL)
divider?.let { dividerItemDecoration.setDrawable(it) }
recyclerView.addItemDecoration(dividerItemDecoration)

Thus, DividerItemDecoration is a simple and convenient way to add visual separators between list items.