GeneralAdapter

gistfile1.txt

package com.example.learnkotlin

import android.content.Context
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import androidx.recyclerview.widget.RecyclerView

/**
 * Created on 2020/4/29.
 * 通用的 GeneralAdapter
 *
 */
open abstract class GeneralAdapter<T>(
    private val context: Context,
    private val layoutResId: Int,
    private val data: List<T>,
    private val refresher: (View, T) -> Unit
) : RecyclerView.Adapter<GeneralAdapter.MyViewHolder<T>>() {

    var onClickListener: OnClickListener<T>? = null

    class MyViewHolder<T>(
        itemView: View,
        private val onClickListener: OnClickListener<T>?,
        val refresher: (View, T) -> Unit
    ) :
        RecyclerView.ViewHolder(itemView) {
        fun refreshView(data: T) {
            itemView.setOnClickListener(View.OnClickListener {
                onClickListener?.onClick(
                    itemView,
                    data
                )
            })
            refresher(itemView, data)
        }
    }

    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): MyViewHolder<T> {
        val view = LayoutInflater.from(context).inflate(layoutResId, parent, false)
        return MyViewHolder(view, onClickListener, refresher)
    }

    override fun getItemCount(): Int {
        return if (data.isNullOrEmpty()) 0 else data.size
    }

    override fun onBindViewHolder(holder: MyViewHolder<T>, position: Int) {
        holder.refreshView(data[position])
    }

    interface OnClickListener<T> {
        fun onClick(view: View, data: T): Unit
    }

}