利用Kotlin编写一个Adapter适配器

package com.example.administrator.kotlintest

import android.content.Context
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.widget.BaseAdapter
import android.widget.TextView

/**
 * Created by zhanglei on 2017/5/31.
 * ListView的适配器
 */
class MyAdapter(var mList: List, var context: Context) : BaseAdapter() {

  override fun getView(position: Int, convertView: View?, parent: ViewGroup?): View {
    var holder: MyViewHolder
    //重用view
    var v: View
    if (convertView == null) {
      holder = MyViewHolder()
      v = LayoutInflater.from(context).inflate(R.layout.list_item_layout, parent, false)
      holder.textView = v.findViewById(R.id.list_text_item) as TextView
      //设置tag
      v.tag = holder
    } else {
      v = convertView
      //获取tag并强转
      holder = v.tag as MyViewHolder
    }

    //为TextView设置内容
    holder.textView.text = mList[position]
    return v
  }

  override fun getItem(position: Int): Any {
    return mList[position]
  }

  override fun getItemId(position: Int): Long {
    return position.toLong()
  }

  override fun getCount(): Int {
    return mList.size
  }

  class MyViewHolder {

    lateinit var textView: TextView

  }
}