RecyclerView流式布局

class HistoryAdapter(var activity: Activity, var resId: Int, var titles: List<String>, var search_destination: TextView) : RecyclerView.Adapter<HistoryAdapter.MyViewHolder>() {
    override fun onBindViewHolder(holder: MyViewHolder?, position: Int) {
        if (holder != null) {
            val history_city_item_text = holder.history_city_item_text
            history_city_item_text.text = titles[position]
            history_city_item_text.onClick {
                search_destination.text = titles[position]
            }
        }
    }

    override fun getItemCount(): Int {
        return titles.size
    }

    override fun onCreateViewHolder(parent: ViewGroup?, viewType: Int): MyViewHolder {
        return MyViewHolder(View.inflate(activity, resId, null))
    }

    fun getView(position: Int, convertView: View?, parent: ViewGroup?): View {
        val create = ViewHolderUtil.create(convertView, parent, R.layout.layout_history_city_item)
        val city = titles[position]
        create.getTextView(R.id.history_city_item_text).text = city
        create.convertView.onClick {
            search_destination?.text = city
        }
        return create.convertView
    }

    fun clear() {
        (titles as ArrayList).clear()
        notifyDataSetChanged()
    }

    inner class MyViewHolder(var mItemView: View) : RecyclerView.ViewHolder(mItemView) {
        var history_city_item_text = mItemView.findViewById(R.id.history_city_item_text) as TextView
    }
}

---

class SearchActivity : BaseActivity() {

    override fun getlayoutRes(): Int {
        return R.layout.activity_search
    }

    override fun initData() {
        super.initData()
        search_close.onClick {
            finish()
        }
        search_destination.onClick {
            launchActivity { }
        }
        search_time.onClick {
            launchActivity {
                putExtra(OnlyBrowseCalendarSelectActivity.COMEFROM, OnlyBrowseCalendarSelectActivity.COMEFROM_SEARCH)
            }
        }
        search.onClick {
            val destination = search_destination.text.toString().trim()
            val time = search_time.text.toString().trim()
            val content = search_content.text.toString().trim()
            if (TextUtils.isEmpty(destination) || TextUtils.isEmpty(time) /*|| TextUtils.isEmpty(content)*/) {
                toast(R.string.please_enter_complete)
            } else {
                EventBus.getDefault().post(ToSearchEvent(destination, content, time))
                val history = SPUtil.getString(this@SearchActivity, HISTORY_CITY)
                if (history == "") {
                    SPUtil.put(this@SearchActivity, HISTORY_CITY, destination)
                } else {
                    if (!history.contains(destination))
                        SPUtil.put(this@SearchActivity, HISTORY_CITY, history + "," + destination)
                }
                finish()
            }
        }
        search_delete.onClick {
            SPUtil.put(this@SearchActivity, HISTORY_CITY, "")
            value?.clear()
        }
        initHistoryCity()
    }

    var value: HistoryAdapter? = null

    private fun initHistoryCity() {
        val history = SPUtil.getString(this@SearchActivity, HISTORY_CITY)
        if (history != "") {
            val titles = history.split(",")
            value = HistoryAdapter(this, R.layout.layout_history_city_item, titles, search_destination)
            val gridLayoutManager = GridLayoutManager(this, 5)
            gridLayoutManager.spanSizeLookup = object : GridLayoutManager.SpanSizeLookup() {
                override fun getSpanSize(position: Int): Int {
                    return setSpanSize(position, titles)
                }
            }
            history_city.layoutManager = gridLayoutManager
            history_city.adapter = value
        }
    }


    private fun setSpanSize(position: Int, listEntities: List): Int {
        var count: Int
        val length = listEntities[position].length
        if (length <= 2) {
            count = 1
        } else if (length <= 5) {
            count = 2
        } else if (length <= 10) {
            count = 3
        } else {
            count = 4
        }
        return count
    }

    @Subscriber(mode = ThreadMode.MAIN)
    fun searchCityEvent(searchTimeEvent: SearchTimeEvent) {
        search_time.text = searchTimeEvent.dayString
    }

    @Subscriber(mode = ThreadMode.MAIN)
    fun searchCityEvent(searchCityEvent: SearchCityEvent) {
        search_destination.text = searchCityEvent.cityString
    }
}