将onClick从onBindViewHilder移动到片段

Question

我正在nestedRecyclerView，上实现onClick，onClick在子RecyclerView中，我在recyclerView的onBindViewHolder中实现它。不过，我想将它传输到一个片段中，一旦单击按钮，我就可以访问它的视图模型。

这就是我的回收商的看法

class ProductAdapter(private val context: Context, private val productModel: List<Product>) :
    RecyclerView.Adapter<ProductAdapter.ProductView>() {


    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ProductView {
        val view = LayoutInflater.from(parent.context).inflate(R.layout.product_item, parent, false)
        return ProductView(view, productModel)
    }

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

    override fun onBindViewHolder(holder: ProductView, position: Int) {
        var product = productModel[position]
        holder.product = listOf(product)
        holder.setClick(object : ItemClickListener {
            override fun onItemClickListener(view: View, position: Int) {
                Toast.makeText(context, "" + productModel[position].productName, Toast.LENGTH_SHORT)
                    .show()
            }
        })
    }
    class ProductView(itemView: View, var product: List<Product>) :
        RecyclerView.ViewHolder(itemView), View.OnClickListener {
        private val addToCart: ImageView = itemView.findViewById(R.id.addToCart)
        lateinit var listener: ItemClickListener

        fun setClick(listener: ItemClickListener) {
            this.listener = listener
        }

        init {
            addToCart.setOnClickListener(this)
        }

        override fun onClick(v: View?) {
            listener.onItemClickListener(v!!, adapterPosition)
        }
    }
    interface ItemClickListener {
        fun onItemClickListener(view: View, position: Int)
    }
}

Answer 1

移动setClick()函数，并在适配器中公开

class ProductAdapter (private val context: Context, private val productModel:  
List<Product>) :
RecyclerView.Adapter<ProductAdapter.ProductView>() {

private var listener:ItemClickListener?=null

override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ProductView {
    val view = LayoutInflater.from(parent.context).inflate(R.layout.product_item, parent, false)
    return ProductView(view, productModel)
}

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

override fun onBindViewHolder(holder: ProductView, position: Int) {
    val product = productModel[position]
    holder.product = listOf(product)
}

public fun setClick(listener:ItemClickListener){
    this.listener = listener
}
class ProductView(itemView: View, var product: List<Product>) :
        RecyclerView.ViewHolder(itemView), View.OnClickListener {
     val addToCart: ImageView = itemView.findViewById(R.id.addToCart)
    lateinit var listener: ItemClickListener

    init {
        addToCart.setOnClickListener(this)
    }

    override fun onClick(v: View?) {
        listener.onItemClickListener(v!!, adapterPosition)
      }
   }
 interface ItemClickListener {
    fun onItemClickListener(view: View, position: Int)
     }
}

在包含子适配器的parentAdapter中，将接口作为承包商参数传递，在ViewHolder类中，从子适配器创建实例并调用此接口

 class ParentAdapter (private val listener: ItemClickListener) 
 { 
 ....
 ....
 class ViewHolder(your parameters){
 var adapter = ProductAdapter (yourParameters);
 adapter.setClick(object:ProductAdapter.ItemClickListener() {
             override fun onItemClickListener(view: View, position: Int) {
                listener.onItemClickListener(view,position)
            }
        });
   }
 }

然后，您可以将片段上下文传递给parentAdapter，并在该片段中实现onItemClickListener。