如何从 android 中 recyclerview 的适配器位置访问所有图像视图？

Question

在我的程序中，有一个recyclerview。 recyclerview 的每个项目都有一个图像视图。当条件满足时，我需要更改所有项目的图像视图的图像。所以我需要从适配器的某个位置访问整个位置的图像视图。我需要从适配器内部访问。我搜索并从这里找到了答案。但我只能从我们的 fragment/activity 页面访问。不是来自适配器。该代码是

val row: View? = rvLocations?.layoutManager?.findViewByPosition(position)

如何访问适配器内的所有视图？谢谢

Answer 1

这取决于您构建适配器的方式，这是在 kotlin

中使用 viewBinding 的完整适配器样板


class ItemListAdapter(
    private val list: List<ItemDataModel>,
    private val listener: OnItemClickListener
) : RecyclerView.Adapter<ItemListAdapter.ViewHolder>() {

    interface OnItemClickListener{
        fun onItemClick(view: View, position: Int)
    }

    inner class ViewHolder(private var binding: ItemListRcvBinding) : RecyclerView.ViewHolder(binding.root) {
        fun bind(item: ItemDataModel, position: Int) {
            // you can get access to all your view and its position here
            // e.g:

            // context
            val context = binding.imageView1.context

            // clicklistener
            binding.imageView1.setOnclickListener{ view ->
               listener.onItemClick(view, position)
             }
         
            // change image by condition
            when(item.condision){
               conditionA -> binding.imageView1.setImageResource(R.drawable.image1)
               else -> //do something
            }

            //or
            
            when(position){
               0 -> binding.imageView1.setImageResource(R.drawable.image1)
               else -> //do something
            }
        }
    }

    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolder {
        val view = ItemListRcvBinding.inflate(LayoutInflater.from(parent.context))
        return ViewHolder(view)
    }

    override fun onBindViewHolder(holder: ViewHolder, position: Int) {
        val item = getItem(position)
        holder.bind(item,position)
    }

    override fun getItemCount(): Int = list.size
    
}

在activity/fragment

...
adapter = ItemListAdapter(myList1, object:  ItemListAdapter.OnItemClickListener{
        override fun onItemClick(view: View, position: Int){
         //do something
     }
   }

...

如何从 android 中 recyclerview 的适配器位置访问所有图像视图？

How can I access all imageviews from a position of an adapter of recyclerview in android?

java

android

adapter

kotlin

android-recyclerview