【4】Kotlin中使用RecyclerView

布局不多说没变化，初始化recyclerview

private var mRecyclerView:RecyclerView?=null;
mRecyclerView = findViewById(R.id.mRecyclerView)

Adapter

class MyAdapter : RecyclerView.Adapter<MyAdapter.ViewHolder>{
        private var mContext:Context ? =null

        constructor(context :Context){//构造方法需自己写，不会默认生成无参数
            mContext = context
        }

        override fun onCreateViewHolder(parent: ViewGroup?, viewType: Int): ViewHolder {
 return ViewHolder(LayoutInflater.from(mContext).inflate(R.layout.item_main,null,false))
        }

        override fun getItemCount(): Int {
            return 80
        }

        override fun onBindViewHolder(holder: ViewHolder?, position: Int) {
                holder?.textview?.text="sadsf+position+"+position
        }

        class ViewHolder : RecyclerView.ViewHolder {
            var textview :TextView ? =null
            constructor(itemView:View) : super(itemView){
                textview = itemView.findViewById(R.id.tv_text)
            }

        }
    }

使用Adapter

        mRecyclerView?.layoutManager =  LinearLayoutManager(this)
        mRecyclerView?.adapter = MyAdapter(this)
        mRecyclerView?.adapter?.notifyDataSetChanged()//更新方式