如何解决在回收站视图中设置按钮时出错？ 简单代码，不使用接口
在回收站视图中按下按钮时出现错误。我的应用程序没有崩溃。我正在尝试在回收站视图中设置一个按钮并在 setOnClickListener 内调用 onBindViewHolder。在 holder.Button.setOnClickListener{} 中，我将按钮文本更改为 notified。但是当我按下一个按钮时，另一个列表中其他按钮文本的值也会发生变化。这是 firestore 文档的列表视图。我有很多文件上传到回收站视图中。如果我收到错误，我应该如何在没有此错误的情况下实现 onclicklistener 按钮。[![https://i.stack.imgur.com/S0Oxm.jpg][1]][1] [![在此处输入图片描述] ][2]][2]
/**This my activity for recycler view*/
package com.example.bloodbankcompany.recyclerview
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.util.Log
import android.widget.Adapter
import android.widget.Toast
import androidx.recyclerview.widget.LinearLayoutManager
import androidx.recyclerview.widget.RecyclerView
import com.example.bloodbankcompany.MyAdapter
import com.example.bloodbankcompany.R
import com.example.bloodbankcompany.User1
import com.example.bloodbankcompany.User2
import com.google.firebase.firestore.*
import java.lang.NullPointerException
class MainActivity2 : AppCompatActivity() {
private lateinit var recyclerView: RecyclerView
private lateinit var userArrayList: ArrayList<User2>
private lateinit var myAdapter: MyAdapter2
private val mFireStore = FirebaseFirestore.getInstance()
var db = FirebaseFirestore.getInstance()
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main2)
recyclerView= findViewById(R.id.recyclerview)
recyclerView.layoutManager = LinearLayoutManager(this)
recyclerView.setHasFixedSize(true)
userArrayList= arrayListOf()
myAdapter =MyAdapter2(userArrayList)
recyclerView.adapter = myAdapter
EventChangeListener()
}
private fun EventChangeListener() {
try {
mFireStore.collection("applicationForm").addSnapshotListener(object :
EventListener<QuerySnapshot> {
override fun onEvent(value: QuerySnapshot?,error: FirebaseFirestoreException?) {
if (error != null) {
Log.e("firestore error",error.message.toString())
}
try {
for (dc: DocumentChange in value?.documentChanges!!) {
if (dc.type == DocumentChange.Type.ADDED) {
userArrayList.add(dc.document.toObject(User2::class.java))
}
// Toast.makeText(applicationContext,userArrayList.toString(),Toast.LENGTH_SHORT).show()
}
} catch (e:NullPointerException){
}
myAdapter.notifyDataSetChanged()
}
})
} catch (e:NullPointerException){
}
}
}
/**
* This is my myAdapter activity for adapater*/
package com.example.bloodbankcompany.recyclerview
import android.content.Intent
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.widget.Button
import android.widget.TextView
import android.widget.Toast
import androidx.recyclerview.widget.RecyclerView
import com.example.bloodbankcompany.R
import com.example.bloodbankcompany.RegisterActivity
import com.example.bloodbankcompany.User2
import com.google.firebase.firestore.FirebaseFirestore
import kotlinx.android.synthetic.main.list_item2.view.*
class MyAdapter2(private val userList: ArrayList<User2>): RecyclerView.Adapter<MyAdapter2.MyViewHolder>(){
var id: String = ""
private val mFireStore = FirebaseFirestore.getInstance()
override fun onCreateViewHolder(parent: ViewGroup,viewType: Int): MyAdapter2.MyViewHolder {
val itemView = LayoutInflater.from(parent.context).inflate(R.layout.list_item2,parent,false)
return MyViewHolder(itemView)
}
override fun onBindViewHolder(holder: MyAdapter2.MyViewHolder,position: Int) {
val user:User2 = userList[position]
holder.name.text= user.name
holder.phone.text= user.phone
holder.address.text =user.address
holder.bloodGroup.text= user.bloodgroup
holder.id.text = user.id
//Setting onclicklistener to my adapter and starting intent
holder.button.setOnClickListener {
// holder.io = "kkj"
// holder.id.text = " "
holder.button.setText("notified")
// val context=holder.button.context
// val intent = Intent( context,RegisterActivity::class.java)
// context.startActivity(intent)
}
}
override fun getItemCount(): Int {
return userList.size
}
public class MyViewHolder(itemView : View): RecyclerView.ViewHolder(itemView){
val name : TextView = itemView.findViewById(R.id.tvfirstname1)
val phone :TextView= itemView.findViewById(R.id.tvphone11)
val address : TextView= itemView.findViewById(R.id.tvaddress1)
val bloodGroup: TextView =itemView.findViewById(R.id.tvbloodg1)
val id: TextView = itemView.findViewById(R.id.tvid)
var io: String? = ""
var button: Button = itemView.findViewById(R.id.btn_notify)
class ViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView){
init {
itemView.btn_notify.setOnClickListener {
}
}
}
}
} ```
[1]: https://i.stack.imgur.com/S0Oxm.jpg
[2]: https://i.stack.imgur.com/BqDMf.jpg
解决方法
在您的适配器中为 clickListener 创建接口并将其设置在 constructor
interface OnItemClickListener {
fun onItemClick(position: Int)
}
并在ViewHolder中设置bind你的按钮
fun bind(position: Int,listener: OnItemClickListener) {
button.setOnClickListener { v -> listener.onItemClick(position) }
}
然后在 onBindViewHolder
holder.bind( position,onItemClickListener)
最后当点击按钮时，您可以在 Activity or Fragment
示例：
adapter = Adapter(getContext(),models) { position -> }
简单代码，不使用接口
实际上，我发现您以正确的方式执行此操作，但是您在那里使用了两个 ViewHolder 类，这是导致问题的原因。尝试使用下面的代码一次，然后再试一次。希望它有效。
class mAdapter(val context: Context,private val dataList: ArrayList<String>):
RecyclerView.Adapter<mAdapter.ViewHolder>() {
override fun onCreateViewHolder(parent: ViewGroup,viewType: Int): mAdapter.ViewHolder {
val v = LayoutInflater.from(parent.context).inflate(R.layout.item_card_view,parent,false)
return mAdapter.ViewHolder(v)
}
override fun onBindViewHolder(holder: mAdapter.ViewHolder,position: Int) {
holder.txtView.setText(dataList.get(position))
//Your Button setOnClickLister
holder.btnName.setOnClickListener {
// action here
}
}
override fun getItemCount(): Int {
return dataList.size
}
class ViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView) {
val txtView = itemView.findViewById(R.id.textView) as TextView
val btnName = itemView.findViewById(R.id.btnName) as Button
}
}
希望它能解决您的问题。如果有帮助，请点赞。提前致谢。
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