override fun onBindViewHolder(holder: RecyclerView.ViewHolder, position: Int) {
            when (holder) {
                is DateHolder -> {
                    (userTracks[position] as Date).let { date ->
                        holder.date.text = date.startDate
                    }
                }

                is TrackHolder -> {
                    (userTracks[position] as UserTrack).let { userTrack ->
                        holder.bindTrack(userTrack)
                        holder.distance.text =
                            "${String.format(Locale.getDefault(), "%.2f", userTrack.distance)} км"
                        holder.duration.text =
                            LocationConverter.convertMStoTime(userTrack.activeDuration)
                        holder.startTime.text = userTrack.startTime
                        if (showCb) {
                            holder.trackCheckBox.visibility = View.VISIBLE
                        }

                    }
                }
            }

        }

        inner class TrackHolder(itemView: View) : RecyclerView.ViewHolder(itemView),
            View.OnClickListener, View.OnLongClickListener {

            init {
                itemView.setOnClickListener(this)
                itemView.setOnLongClickListener(this)
            }

            lateinit var mUserTrack: UserTrack
            val distance: TextView = itemView.card_distance_params
            val duration: TextView = itemView.card_duration_params
            val startTime: TextView = itemView.card_star_time
            val trackCheckBox: CheckBox = itemView.track_item_cb


            override fun onClick(v: View?) {

                val intent = Intent(this@TrackListFragment.context, TrackInfoActivity::class.java)
                intent.putExtra(TRACK_PARCELABLE, mUserTrack)
                Log.d("mUserTrack.trackID", mUserTrack.startTime)
                this@TrackListFragment.startActivity(intent)
            }

            fun bindTrack(userTrack: UserTrack) {
                mUserTrack = userTrack
            }

            override fun onLongClick(v: View?): Boolean {
                showCb = true
                updateUI()
                return true
            }


        }

    fun updateUI() {
        rv_tracks.adapter = DataAdapter()
    }