Kotlin-recycleview简单使用和删除

效果图：

1.

activity_main 页面主布局

2.

list_item 页面子布局

3.添加适配器，添加list数据源，左滑可以删除数据，

 删除数据实现思路：removeAt数据源 然后调用notify方法刷新adapter即可

package org.mightyfrog.android.minimal.recyclerview

import android.os.Bundle
import android.support.v7.app.AppCompatActivity
import android.support.v7.widget.LinearLayoutManager
import android.support.v7.widget.RecyclerView
import android.support.v7.widget.helper.ItemTouchHelper
import android.util.Log
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.widget.Button
import android.widget.TextView
import kotlinx.android.synthetic.main.activity_main.*
import java.util.*

/**
 * RecyclerView swipe-and-dimiss, drag-and-drop sample code.
 *
 * @author Shigehiro Soejima
 */
class MainActivity : AppCompatActivity() {
    //参考网址： https://github.com/mightyfrog/RecyclerView
    companion object {
        private val list = ArrayList(100)

        init {
            for (i in 0..10) {
                list.add("#$i")
            }
        }
    }

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        recyclerView.also { rv ->
            rv.layoutManager = LinearLayoutManager(this) as RecyclerView.LayoutManager?
            rv.adapter = MyAdapter()
            setupItemTouchHelper()
        }
    }


    private fun setupItemTouchHelper() {
        val helper = ItemTouchHelper(object : ItemTouchHelper.SimpleCallback(
                ItemTouchHelper.UP or ItemTouchHelper.DOWN,
                ItemTouchHelper.LEFT or ItemTouchHelper.RIGHT) {
            override fun onMove(recyclerView: RecyclerView, selected: RecyclerView.ViewHolder,
                                target: RecyclerView.ViewHolder): Boolean {
                val from = selected.adapterPosition
                val to = target.adapterPosition
                Collections.swap(list, from, to)
                recyclerView.adapter?.notifyItemMoved(from, to)

                return true
            }

            override fun onSwiped(viewHolder: RecyclerView.ViewHolder, direction: Int) {
                list.removeAt(viewHolder.adapterPosition)
                recyclerView.adapter?.notifyItemRemoved(viewHolder.adapterPosition)
            }
        })
        helper.attachToRecyclerView(recyclerView)
    }

    private class MyAdapter : RecyclerView.Adapter() {

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

        override fun onBindViewHolder(viewHolder: MyViewHolder, i: Int) {
            viewHolder.tv.text = list[i]
            viewHolder.button.setOnClickListener {
               Log.e("TAG","wang button: "+i)
            }
        }

        override fun onCreateViewHolder(viewGroup: ViewGroup, i: Int): MyViewHolder {
            val view = LayoutInflater.from(viewGroup.context)
                    .inflate(R.layout.list_item, viewGroup, false)
            return MyViewHolder(view)
        }
    }

    class MyViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView) {
        val tv: TextView = itemView.findViewById(R.id.text_view)
        val button: Button = itemView.findViewById(R.id.button)
    }
}

 

end