kiotlin学习实现listview列表

版权声明：本文为博主原创文章，未经博主允许不得转载。 https://blog.csdn.net/Te_small/article/details/83582428

适配器

 class MyAdapter(context: Context, list: ArrayList<String>) : BaseAdapter() {
        var list: ArrayList<String>? = null
        var context: Context? = null

        init {
            this.context=context
            this.list=list
        }
        override fun getView(position: Int, convertView: View?, parent: ViewGroup?): View {
            var view: View
            var viewHolder: ViewHolder
            if (convertView == null) {
                view = View.inflate(context, R.layout.kotlin_lv_layout, null)
                viewHolder = ViewHolder()
                viewHolder.tv = view.findViewById(R.id.tv)
                view.tag = viewHolder
            } else {
                view = convertView
                viewHolder = view.tag as ViewHolder
            }
            viewHolder.tv!!.text = list!!.get(position)

            return view
        }

        override fun getItem(position: Int): Any {
            return list!!.get(position)
        }

        override fun getItemId(position: Int): Long {
            return 0
        }

        override fun getCount(): Int {
            return list?.size ?: 0
        }

        class ViewHolder {
            var tv: TextView? = null
        }

    }

设置适配器

    var list = ArrayList<String>()
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        data()
        list_view.adapter = MyAdapter(this, list)
        list_view.setOnItemClickListener(this)
    }

    fun data() {
        for (i in 0..20) {
            list.add("kotlin")
        }
    }