如何在 Adapter 中的 Kotlin 中提供长按监听器

Question

如何在Adapter中实现长按监听？我已经通过接口实现了onClickLister。但是不知道怎么实现长按监听

这是适配器

class DokladAdapter(private val listener: OnItemClickListener): ListAdapter<DokladTuple, DokladAdapter.PolozkaViewHolder>(DiffCallback()) {
    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): PolozkaViewHolder {
        val binding = DokladyItemBinding.inflate(LayoutInflater.from(parent.context), parent, false)
        return PolozkaViewHolder(binding)
    }

    override fun onBindViewHolder(holder: PolozkaViewHolder, position: Int) {
        val currentItem = getItem(position)
        if (currentItem != null) {
            holder.bind(currentItem)
        }
    }

    inner class PolozkaViewHolder(private val binding: DokladyItemBinding): RecyclerView.ViewHolder(binding.root) {
        init {
            binding.root.setOnClickListener{
                val position = bindingAdapterPosition
                if (position != RecyclerView.NO_POSITION){
                    val item = getItem(position)
                    if (item != null){
                        listener.onItemClick(item)
                    }
                }
            }
        }
        fun bind(polozkaHlavicka: DokladTuple){
            binding.apply {
                tvU.text = "U"
                tvDOKL.text = polozkaHlavicka.doklad.toString()
                //tvODB.text = "200"
                tvORG.text = polozkaHlavicka.odj.toString()
                tvDATUM.text = polozkaHlavicka.datuct.toString()
            }
        }
    }
    interface OnItemClickListener{
        fun onItemClick(polozkaHlavicka: DokladTuple)
    }

    class DiffCallback: DiffUtil.ItemCallback<DokladTuple>(){
        override fun areItemsTheSame(oldItem: DokladTuple, newItem: DokladTuple) =
            oldItem.doklad == newItem.doklad

        override fun areContentsTheSame(oldItem: DokladTuple, newItem: DokladTuple) =
            oldItem == newItem
    }
}

我在Activity

中有覆盖功能

class Activity: AppCompatActivity(), PolozkaAdapter.OnItemClickListener{
override fun onItemClick(polozkaDoklad: PolozkaTuple) {
        //TODO - do something
    }
}

Answer 1

更新您的 OnItemClickListener 以包含长按处理程序作为

interface OnItemClickListener{ 
    fun onClick(polozkaHlavicka: DokladTuple)
    fun onLongClick(polozkaHlavicka: DokladTuple)
}

现在在PolozkaViewHolderinit中添加longClickListener作为

binding.root.setOnLongClickListener{
    // get position data and call long click handler 
    //listener.onLongClick()
    true
}

最终在 Activity 中为 onLongClick

更新 OnItemClickListener 的实现

Answer 2

使用 Kotlin，我这样做时没有添加监听器接口，我发现它更具可读性和易用性，这是我的示例，您可以根据您的适配器和对象调整它对于这个例子，我有一个 Cycle 对象，它的服装你可以用你的改变它我声明了两个变量

var onItemClick: ((Cycle) -> Unit)? = null
var onItemLongClick: ((Cycle) -> Unit)?= null

然后在视图持有者中

init {
            itemView.setOnClickListener{
                onItemClick?.invoke(cycleList[adapterPosition])
            }
        itemView.setOnLongClickListener {
            onItemLongClick?.invoke(cycleList[adapterPosition])
            return@setOnLongClickListener true
        }

    }

而且我在任何地方都这样使用它:

    cycleAdapter= CycleAdapter(cycleList)
    binding.cyclesRecyclerView.adapter=cycleAdapter
    cycleAdapter.onItemClick={
       Toast.makeText( requireContext(),it.cycleName, Toast.LENGTH_SHORT).show()
    }
    cycleAdapter.onItemLongClick={
      Toast.makeText( requireContext(),it.cycleName, Toast.LENGTH_SHORT).show()
    }

这里的“it”代表被点击的item对象，对我来说就是clicked Cycle

如何在 Adapter 中的 Kotlin 中提供长按监听器

How to provide long click listener in Kotlin in Adapter

android

kotlin

android-recyclerview

onclicklistener

onlongclicklistener