什么是RecyclerView

RecyclerView是当前主流用于显示列表的UI控件.

基础样例

效果图

方案简要介绍

在app模块build.gradle文件中增加如下依赖

implementation 'androidx.recyclerview:recyclerview:1.1.0'

在activity对应的布局文件中增加RecyclerView

新增一个Adapter用于展示列表中每一行内容(含对应布局文件)
详见下面完整代码中的RvAdapter及其布局文件.

在activity中实例化Adapter,设置数据,并将adapter设置给RecyclerView

private fun initRecyclerView() {
       var dataList = getData()    val adapter = RvAdapter()    adapter.setData(dataList)    recyclerView.adapter = adapter    recyclerView.layoutManager = LinearLayoutManager(this)}private fun getData(): List
   
     {
       val dataList = ArrayList
    
     ()    for (index in 0 until 100) {
           val text = " 数据$index "        dataList.add(text)    }    return dataList}

完整代码

activity代码:MainActivity

class MainActivity : AppCompatActivity() {
       override fun onCreate(savedInstanceState: Bundle?) {
           super.onCreate(savedInstanceState)        setContentView(R.layout.activity_main)        initRecyclerView()    }    private fun initRecyclerView() {
           var dataList = getData()        val adapter = RvAdapter()        adapter.setData(dataList)        recyclerView.adapter = adapter        recyclerView.layoutManager = LinearLayoutManager(this)    }    private fun getData(): List
   
     {
           val dataList = ArrayList
    
     ()        for (index in 0 until 100) {
               val text = " 数据$index "            dataList.add(text)        }        return dataList    }}

MainActivity对应布局文件: activity_main.xml

RecyclerView对应Adapter: RvAdapter

class RvAdapter : RecyclerView.Adapter
   
    () {
       private var mDataList = mutableListOf
    
     ()    private lateinit var mContext: Context    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolder {
           mContext = parent.context        val view = LayoutInflater.from(mContext).inflate(R.layout.item_layout, parent, false)        return ViewHolder(view)    }    override fun onBindViewHolder(holder: RecyclerView.ViewHolder, position: Int) {
           val data = mDataList[position]        //更新UI上nameTv展示内容        holder.itemView.nameTv.text = data        //设置点击事件        holder.itemView.setOnClickListener {
               Toast.makeText(mContext, data, Toast.LENGTH_SHORT).show()        }    }    fun setData(dataList: List
     
      ) {
           mDataList.clear()        mDataList.addAll(dataList)        notifyDataSetChanged()    }    override fun getItemCount(): Int = mDataList.size    class ViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView)}