多类型的 RecyclerView.Adapter，使用Databinding

原创已于 2022-12-13 15:36:28 修改 · 685 阅读

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#android #kotlin #databind #Adapter

于 2022-12-13 14:22:04 首次发布

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本文介绍了一个实现多类型RecyclerView Adapter的方法，并结合Databinding进行数据绑定，支持图片和视频文件的预览及删除操作。代码示例中详细展示了如何根据不同视图类型创建ViewHolder并绑定数据。

在这里插入图片描述

多类型的 RecyclerView.Adapter
使用Databinding

import android.databinding.DataBindingUtil
import android.support.v7.widget.RecyclerView
import android.view.LayoutInflater
import android.view.ViewGroup

class MultipleAdapter : RecyclerView.Adapter<RecyclerView.ViewHolder>() {

    var mData: MutableList<String> = mutableListOf()

    companion object {
        private const val TYPE_ADD = 0
        private const val TYPE_IMAGE = 1
    }

    override fun getItemViewType(position: Int): Int {
        return if (mData.isEmpty() || position >= mData.size) {
            TYPE_ADD
        } else {
            TYPE_IMAGE
        }
    }

    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): RecyclerView.ViewHolder {
        return if (TYPE_ADD == viewType) {
            val binding = DataBindingUtil.inflate<ItemLayoutAddBinding>(
                LayoutInflater.from(parent.context),
                R.layout.item_layout_add, parent, false
            )
            AddHolder(binding)
        } else {
            val binding = DataBindingUtil.inflate<ItemLayoutImageBinding>(
                LayoutInflater.from(parent.context),
                R.layout.item_layout_image, parent, false
            )
            ImageHolder(binding)
        }
    }

    override fun onBindViewHolder(holder: RecyclerView.ViewHolder, position: Int) {
        if (holder.itemViewType == TYPE_ADD) {
            holder as AddHolder
            holder.bindItem()
        } else {
            holder as ImageHolder
            holder.bindItem(mData[position], holder.adapterPosition)
        }
    }

    override fun getItemCount(): Int {
        return mData.size + 1

    }

    inner class AddHolder(val binding: ItemLayoutAddBinding) :
        RecyclerView.ViewHolder(binding.root) {

        fun bindItem() {
            binding.tvAdd.setOnClickListener { }
            binding.executePendingBindings()
        }
    }

    inner class ImageHolder(private val binding: ItemLayoutImageBinding) :
        RecyclerView.ViewHolder(binding.root) {

        fun bindItem(url: String, position: Int) {
            binding.ivPhoto.setImageResource(R.mipmap.ic_launcher_round)
            binding.executePendingBindings()
        }
    }
}