RecyclerView 中没有项目选择

Question

我在我的程序中制作了一个垂直的回收器视图。当我单击任何 recyclerView 项目时，我看不到单击监听器正在工作。这是我的 Adapter 类代码：

class BoardItemsAdapter(private var list : ArrayList<Board>):RecyclerView.Adapter<BoardItemViewHolder>(){
private var onClickListener: OnClickListener? = null
    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): BoardItemViewHolder {
        val from  = LayoutInflater.from(parent.context)
        val binding = ItemBoardBinding.inflate(from , parent, false)
        return BoardItemViewHolder(parent.context, binding)
    }

    override fun getItemCount(): Int = list.size

    override fun onBindViewHolder(holder: BoardItemViewHolder, position: Int) {
        holder.bindBoardItem(list[position])
    }
    interface OnClickListener : OnItemClickListener {
        fun onClick(position: Int, model: Board)
    }
    fun setOnClickListener(onClickListener: OnClickListener){
        this.onClickListener = onClickListener
    }

}

BoardItemViewHolder：

class BoardItemViewHolder( private val context: Context, private val binding : ItemBoardBinding):RecyclerView.ViewHolder(binding.root) {
    fun bindBoardItem(list : Board){

// changing board name acording to database
        binding.tvBoardName.text = list.name
// using "Glide" 3rd party library to loading image for board image
Glide.with(context).load(list.image).centerCrop().placeholder(R.drawable.ic_board).into(binding.ivBoardImage)    
// changing owner of the board acording to database
        binding.tvCreatedBy.text = "Created by ${list.owner}"
    }

}

在我的主要活动：

/*
....
*/
recyclerView.layoutManager = LinearLayoutManager(this,LinearLayoutManager.VERTICAL, false)
            recyclerView.setHasFixedSize(true)
            val adapter = BoardItemsAdapter(boardsList)
            recyclerView.adapter = adapter
            adapter.setOnClickListener(object: BoardItemsAdapter.OnClickListener{
                override fun onClick(position: Int, model: Board) {
                    startActivity(Intent(this@MainActivity, TaskList::class.java))
                }
            })
/*
....
*/

我发现 BoardItemsAdapter 有问题，但我无法弄清楚。

Answer 1

您没有为项目设置 onClick 侦听器，只需将其存储在适配器内。

class BoardItemsAdapter(private var list : ArrayList<Board>) : RecyclerView.Adapter<BoardItemViewHolder>() {
    
    private var onClickListener: OnClickListener? = null

    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): BoardItemViewHolder {
        val from  = LayoutInflater.from(parent.context)
        val binding = ItemBoardBinding.inflate(from, parent, false)
        // Root is just an example.
        binding.root.setOnClickListener([email protected])

        return BoardItemViewHolder(parent.context, binding)
    }

    override fun onBindViewHolder(holder: BoardItemViewHolder, position: Int) {
        holder.bindBoardItem(list[position])
    }

    fun setOnClickListener(onClickListener: OnClickListener){
        this.onClickListener = onClickListener
    }

}

class BoardItemViewHolder( private val context: Context, private val binding : ItemBoardBinding): RecyclerView.ViewHolder(binding.root) {
    fun bindBoardItem(list : Board){
        binding.tvBoardName.text = list.name
        Glide.with(context).load(list.image).centerCrop().placeholder(R.drawable.ic_board).into(binding.ivBoardImage)    
        binding.tvCreatedBy.text = "Created by ${list.owner}"
    }
}