Question

我在SnapHelper上附加了recyclerview。然后，我为recyclerview制作了scrollListener，并且每次将该项目捕捉到显示的中心时，我都会找到该捕捉的视图，然后通过finViewHolderForAdapterPosition（）获得其viewHolder实例。现在，我要访问的是在ViewHolder中创建的自定义变量。有什么办法可以访问它吗？基本上，此变量是在onBindViewHolder（）中设置的，它包含自定义对象，其统计信息显示在此快照视图中。因此，我想从该视图中提取该json对象。

//inside onBindViewHolder()
holder.addressEntity = it

我已经尝试过了，但是没有检测到该变量。只能访问itemView（在构造函数中作为参数发送的变量）。

addressRecyclerView.addOnScrollListener(object : RecyclerView.OnScrollListener() {
        override fun onScrollStateChanged(recyclerView: RecyclerView?, newState: Int) {
            if (newState == AbsListView.OnScrollListener.SCROLL_STATE_IDLE) {
                val centerView = snapHelper.findSnapView(addressRecyclerView.layoutManager)
                centerView!!.setBackgroundResource(R.drawable.payment_button_active)
                lastSnappedView = centerView
                val childViewHolder: RecyclerView.ViewHolder = recyclerView!!.findViewHolderForAdapterPosition(viewManager.getPosition(centerView))
                val selectedViewAddress: Address = childViewHolder.addressEntity //this doesnt work -- selectedViewAddress is red
                AndroidAssets.getInstance(context!!).deliveryAddress = selectedViewAddress 

            } else if (lastSnappedView != null){
                lastSnappedView!!.setBackgroundResource(R.drawable.payment_button_inactive)
                lastSnappedView = null
            }
        }
    })

在适配器内部的ViewHolder作为内部类：

inner class ViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView) {

    //address item views
    var addressEntity: Address? = null
    val cityName: TextView = itemView.findViewById(R.id.cityName)
    val streetName: TextView = itemView.findViewById(R.id.streetName)
    val addressIcon: ImageView = itemView.findViewById(R.id.addressIcon)
}

Answer 1

您只需要将所有者转换为自己的所有者，所以

val myHolder = (searchedHolder as ViewHolder)
//Access custom info with variable

如何从适配器外部访问Recyclerview.ViewHolder参数？

1 个答案: