Question

我是Kotlin android上的新手。我已经为recyclerview创建了适配器。但是我无法为每个recyclerview项目执行click事件。我需要带有参考代码的解释。请帮助我做到这一点。提前致谢。这是我的代码供您参考。

  class CustomAdapter(val readerList: ReaderResponse, mainActivity: 
    MainActivity,val btnlistener: BtnClickListener) : 
    RecyclerView.Adapter<CustomAdapter.ViewHolder>() {


    companion object {
        var mClickListener: BtnClickListener? = null
    }

    override fun onCreateViewHolder(viewgroup: ViewGroup, index: Int): ViewHolder 
    {

        val view=LayoutInflater.from(viewgroup?.context).inflate(R.layout.reader_list,viewgroup,false)
        return ViewHolder(view)
    }

    override fun getItemCount(): Int {
        return readerList.results.size

    }

    override fun onBindViewHolder(holder: ViewHolder, position: Int) {

        mClickListener = btnlistener
        val item = readerList

        val reader:ReaderData = readerList.results[position]
        /*p0?.imageview?.text=reader.readerIcon*/
        holder?.reader_status?.text=reader.readerStatus
        holder?.ward_name?.text=reader.wardName
        holder?.reader_id?.text=reader.readerID
        holder?.reader_name?.text=reader.readerName
        holder?.reader_location?.text=reader.readerLocation


        if (reader.readerStatus.toLowerCase().equals("yes")){
            holder.reader_name.setTextColor(Color.parseColor("#24a314"))
        }else if (reader.readerStatus.toLowerCase().equals("no")){

            holder.reader_name.setTextColor(Color.parseColor("#f4312d"))
            holder.warning.setVisibility(View.VISIBLE)
        }
    }



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

        val imageview = itemView.findViewById(R.id.imageview) as Button
        val reader_name = itemView.findViewById(R.id.reader_name) as TextView
        val reader_location = itemView.findViewById(R.id.floor_no) as TextView
        val ward_name = itemView.findViewById(R.id.ward_name) as TextView
        val reader_id = itemView.findViewById(R.id.reader_id) as TextView
        val reader_status = itemView.findViewById(R.id.reader_status) as TextView
        val warning=itemView.findViewById(R.id.warning) as Button




      }
      open interface BtnClickListener {
        fun onBtnClick(position: Int)
     }

     }

Answer 1

您可以使用以下方法。这是由 Antonio Leiva

摘自this blog

假设您的数据类为ReaderData

class CustomAdapter(val readers: List, val listener: (ReaderData) -> Unit) {

    /* Other methods */

    override fun onBindViewHolder(holder: ViewHolder, position: Int) {

        /*...*/

        holder.imageview.setOnClickListener { 
            listener(readers[position]) 
        }
    }
}

现在在“活动”或“片段”中

recyclerview.adapter = CustomAdapter(readersList) { readerData ->
    Log.i(TAG, "${readerData.readerID} clicked")
}

这个想法是您传递一个lambda，当您单击所需的项目时，该lambda将被执行。

Answer 2

您只需要在初始化此适配器的相应活动中实现BtnClickListener。一旦实现了BtnClickListener，它将覆盖活动中的onBtnClick函数。在适配器中，您唯一需要做的就是在所需元素上初始化onClickListener，然后在该方法中调用 imageview.setOnClickListener {mClickListener？.onBtnClick（position）} 。它会将职位发送回活动中，您可以在那里执行特定任务。例如，我已经在一个Activity中实现了ClickListener，并在该处打印了正常的日志。下面是它的演示代码。

class Main2Activity : AppCompatActivity(), CustomAdapter.BtnClickListener {
    override fun onBtnClick(position: Int) {
        Log.d("Position", position.toString())
    }

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main2)

        recyclerView.layoutManager = LinearLayoutManager(this, LinearLayout.VERTICAL, false)
        val readerResponseList = ArrayList<YourModelClassName>()
        val adapter = CustomAdapter(readerResponseList,this,this)
        recyclerView.adapter = adapter
    }

希望有帮助。

在Kotlin中如何为recyclerview适配器设置点击事件

2 个答案: