kotlin关于RecycleView简单使用

1.添加builder ，引用recycleview

  implementation 'com.android.support:recyclerview-v7:26+'

2.效果图

3.主界面功能

package com.example.admin.zkotlin

import android.content.Context
import android.content.Intent
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.view.View
import android.view.ViewGroup
import androidx.constraintlayout.widget.ConstraintLayout
import kotlinx.android.synthetic.main.activity_photo.*
import androidx.recyclerview.widget.DividerItemDecoration
import androidx.recyclerview.widget.LinearLayoutManager
import androidx.recyclerview.widget.RecyclerView
import kotlinx.android.synthetic.main.item_common.view.*

class MainActivity : AppCompatActivity() {
    var mDataList: ArrayList> = ArrayList();
    protected var mContext: Context? = null

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_photo)
        mContext = this
        initData();
        initView()
    }

    private fun initData() {
        var index = 0
        mDataList.add(Pair(index++,"1约束布局 constraint layout demo"))
        mDataList.add(Pair(index++, "2面向对象六大原则(solid五大原则) >> "))
        mDataList.add(Pair(index++, "3-23种设计模式简介 >> "))
        mDataList.add(Pair(index++, "4Rxjava >> "))
        //common_recycleview.adapter!!.notifyDataSetChanged()
    }

    private fun initView() {
        common_swipe.setOnRefreshListener {
            mDataList.add(0, Pair(mDataList.size + 1, "content00"))   ////Pair的类型可以不固定
            common_recycleview.adapter!!.notifyItemInserted(0)
            // common_swipe.setRefreshing(false)
            common_swipe.isRefreshing = false
        }
        common_recycleview.layoutManager = LinearLayoutManager(mContext)
        common_recycleview.adapter = MyAdapter()

        common_recycleview.addItemDecoration(DividerItemDecoration(mContext, DividerItemDecoration.HORIZONTAL))
    }

    inner class MyAdapter : RecyclerView.Adapter(){
        override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): MyViewHolder {
            return MyViewHolder(layoutInflater.inflate(R.layout.item_common,parent,false))
        }

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

        override fun onBindViewHolder(holder: MyViewHolder, position: Int) {
            if (holder is MyViewHolder){
                var obj = mDataList.get(position) as Pair
                holder.apply {
                    holder.itemView.item_title.setText(obj.first.toString())
                    holder.itemView.item_content.setText(obj.second)
                    holder.itemView.setOnClickListener{v:View->
                        nextAct(obj.first,v)
                    }
                }
            }
        }

        private fun nextAct(first: Int, v: View) {
            var intent: Intent? = null
            when(first){
                0->intent = Intent(mContext,FirstActivity::class.java)
                1,2-> intent = Intent(mContext,TwoActivity::class.java)
                3-> intent = Intent(mContext,ThreeActivity::class.java)
            }
            intent?.let { startActivity(it) }
        }
    }

    inner class MyViewHolder(itemView: View?):RecyclerView.ViewHolder(itemView!!)

}

4.主界面布局

5.item界面布局 

end，还少了一点color  dimens  style  大家自行补上吧，随便写点就行，那个并不重要