override fun onItemClick(position: Int): Boolean {
    if (adapter?.selectedItemCount == 0) {
        val intent = Intent(activity, SessionActivity::class.java)
        val item = adapter?.getItem(position)
        if (item != null) {
            intent.putExtra(BUNDLE_SESSION_ID, item.session.id)
            startActivity(intent)
        }
        return false
    } else {
        actionModeHelper?.toggleSelection(position)
        return true
    }
}
...
adapter = FlexibleAdapter<SessionItem>(items, listeners, true)