Kotlin语言：ListView适配器写法及用法_kotlin listview baseadapter-优快云博客

本文介绍了Kotlin中ListView的布局配置，详细讲解了适配器的用法，特别指出在Kotlin中创建对象无需使用'new'关键字。并提供了实现ListView适配器的代码示例，展示了实际运行效果。

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Kotlin : ListView用法

ListView布局
适配器
实现代码

ListView布局

	<ListView
            android:id="@+id/list1"
            android:layout_width="match_parent"
            android:layout_height="match_parent">

    </ListView>

适配器


class MyAdapter : BaseAdapter {

    var context:Context?=null
    var list:ArrayList<Food>?=null

    constructor(context: Context,list :ArrayList<Food>){
        this.context=context
        this.list=list
    }


    override fun getView(position: Int, convertView: View?, parent: ViewGroup?): View? {


        var viewHolder:ViewHolder?=null
        var view:View?=null

        if(convertView==null){

            view=View.inflate(context,R.layout.item,null);
            viewHolder=ViewHolder()
            viewHolder.imageView=view.findViewById(R.id.tupian)
            viewHolder.textView1=view.findViewById(R.id.wenzhi)

            view.tag=viewHolder

        }else{
            view=convertView
            viewHolder=view!!.tag as ViewHolder
        }

        Glide.with(context).load(list!![position].pic).into(viewHolder.imageView)
        viewHolder.textView1!!.text= list!![position].name

        return view
    }

    override fun getItem(position: Int): Any? {
        return null;
    }

    override fun getItemId(position: Int): Long {

        return position.toLong()

    }

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

    inner class ViewHolder{


        var imageView:ImageView?=null
        var textView1:TextView?=null


    }


}

注意：Kotlin语言中对象不需要使用new关键词

实现代码

  override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        var list: ArrayList<Food> = ArrayList()
        var mRunnable = Runnable {
            run {
                //URL可直接使用readText方法读取json串
                var  s = URL("http://www.qubaobei.com/ios/cf/dish_list.php?stage_id=1&limit=20&page=1").readText()
                var jsonObject = JSONObject(s)
                var optJSONArray = jsonObject.optJSONArray("data")

                for(i in 0 ..optJSONArray.length()-1 step 1 ){
                    var jsonObject1 = optJSONArray.getJSONObject(i)
                    var string =jsonObject1.getString("pic")
                    var name =jsonObject1.getString("title")
                    var food=Food(name,string)
                    list?.add(food)
                }
                list1.adapter=MyAdapter(this,list)
            }
        }
        Thread(mRunnable).start()
    }