立即触发 addTextChangedListener

addTextChangedListener is triggered immediately

我对 addTextChangedListener 有疑问。 当我启动应用程序时(触摸屏幕后)立即触发 addTextChangedListener。

addTextChangedListener 在带有自定义适配器的回收视图中的 ViewHolder Class 中。

我尝试将 setOnClickListener1() 和 setOnClickListener2() 从 onBindViewHolder 移动到 onCreateViewHolder 但最糟糕的是(启动应用程序后立即触发)。

这是我的适配器代码

import android.text.Editable
import android.text.TextWatcher
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.widget.EditText
import android.widget.TextView
import androidx.recyclerview.widget.RecyclerView

open class CustomAdapter(private val data: DataClass, private val activity: MainActivity) :
        RecyclerView.Adapter<CustomAdapter.ViewHolder>() {

    init {
        setHasStableIds(true)
    }


    override fun onCreateViewHolder(
            parent: ViewGroup,
            viewType: Int
    ): ViewHolder {

        val rowItem: View =
                LayoutInflater.from(parent.context).inflate(com.example.essai2.R.layout.list_item_view, parent, false)

        var myview= ViewHolder(rowItem)

      //myview.setOnClickListener1()
      //myview.setOnClickListener2()

        return myview


    }

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

        holder.editText.setText(data.list1[position])
        holder.editText2.setText(data.list2[position])
        holder.textview.setText(data.list3[position])
        holder.setOnClickListener1()
        holder.setOnClickListener2()
    }

    override fun getItemId(position: Int): Long {
        return position.toLong()
    }

    override fun getItemCount(): Int {
        return data.list1.size
    }

   inner class ViewHolder(rowItem: View) : RecyclerView.ViewHolder(rowItem) {

        val textview : TextView = rowItem.findViewById(com.example.essai2.R.id.textview)
        val editText : EditText= rowItem.findViewById(com.example.essai2.R.id.editText)
        val editText2 : EditText= rowItem.findViewById(com.example.essai2.R.id.editText2)


        fun fonction3(position: Int)
        {
              if (position >=1 && position <=98) {
                  data.list3[position] = (0.5 * (data.list2[position - 1].toDouble() + data.list2[position + 1].toDouble())).toString()
                  //activity.Update()
              }
        }

        fun setOnClickListener1() {

            editText.addTextChangedListener(object : TextWatcher {

                override fun afterTextChanged(p0: Editable?) {
                   data.list1[getAdapterPosition()]= editText.text.toString()
                  // activity.fonction()
                }
                override fun beforeTextChanged(p0: CharSequence?, p1: Int, p2: Int, p3: Int) {
                }
                override fun onTextChanged(s: CharSequence?, start: Int, before: Int, count: Int) {
                }
            })
        }

        fun setOnClickListener2() {
            editText2.addTextChangedListener(object : TextWatcher {

                override fun afterTextChanged(p0: Editable?) {
                    data.list2[getAdapterPosition()] = editText2.text.toString()
                    activity.fonction2()
                    fonction3(getAdapterPosition())

                }
                override fun beforeTextChanged(p0: CharSequence?, p1: Int, p2: Int, p3: Int) {
                }
                override fun onTextChanged(s: CharSequence?, start: Int, before: Int, count: Int) {
                }
            })
        }
    }

}

这是我的 activity 代码

import android.os.Bundle
import android.widget.EditText
import android.widget.TextView
import androidx.appcompat.app.AppCompatActivity
import androidx.recyclerview.widget.DividerItemDecoration
import androidx.recyclerview.widget.LinearLayoutManager
import androidx.recyclerview.widget.RecyclerView


class MainActivity : AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        val recyclerView = findViewById<RecyclerView>(R.id.recycler_view)
        recyclerView.layoutManager = LinearLayoutManager(this)

        recyclerView.adapter = CustomAdapter(DataClass(),this)

        recyclerView.addItemDecoration(DividerItemDecoration(this, DividerItemDecoration.VERTICAL))

        var textView2: TextView
        textView2 = findViewById(R.id.textView)
        var editText : EditText
    }

    fun Update()
    {
       // findViewById<RecyclerView>(R.id.recycler_view).getAdapter()?.notifyDataSetChanged()
        val recyclerView = findViewById<RecyclerView>(R.id.recycler_view)
        recyclerView.adapter=CustomAdapter(DataClass(),this)
        (recyclerView.adapter as CustomAdapter).notifyDataSetChanged()
    }


    fun fonction ()
    {
        var textView2: TextView
        textView2 = findViewById(R.id.textView)
        textView2.text="!!!!!!"
    }


    fun fonction2 ()
    {
        var textView2: TextView
        textView2 = findViewById(R.id.textView)
        textView2.text="?????"
    }

    private fun generateData(): List<String> {
        val data: MutableList<String> = ArrayList()
        for (i in 0..99) {
            data.add(i.toString() + "th Element")
        }
        return data
    }
}

class DataClass(){
    var list1: MutableList<String> = generateData2() as MutableList<String>
    var list2: MutableList<String> = generateData3() as MutableList<String>
    var list3: MutableList<String> = generateData4() as MutableList<String>

    private fun generateData2(): List<String> {
        val data: MutableList<String> = mutableListOf()
        for (i in 0..99) {
            data.add(i.toString())
        }
        return data
    }

    private fun generateData3(): List<String> {
        val data: MutableList<String> =mutableListOf()
        for (i in 0..99) {
            data.add((10*i).toString())
        }
        return data
    }

    private fun generateData4(): List<String> {
        val data: MutableList<String> = mutableListOf()
        for (i in 0..99) {
            data.add("none")
        }

        return data
    }

}

在此先感谢您的帮助

编辑:这里是 list_item_view.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="wrap_content">


    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="50dp"
        app:layout_constraintBottom_toBottomOf="parent"

        tools:ignore="MissingConstraints">

        <TextView
            android:id="@+id/textview2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="TextView"
            android:textSize="16dp" />

        <TextView
            android:id="@+id/textview"
            android:layout_width="wrap_content"
            android:layout_height="35dp"
            android:text="TextView"
            android:textSize="16dp" />


        <com.google.android.material.textfield.TextInputEditText
            android:id="@+id/editText2"
            android:layout_width="196dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:focusableInTouchMode="true"
            android:focusedByDefault="false"
            android:hint="hint" />

        <com.google.android.material.textfield.TextInputEditText
            android:id="@+id/editText"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:focusedByDefault="false"
            android:hint="hint" />

    </LinearLayout>



</androidx.constraintlayout.widget.ConstraintLayout>

您不应该在 onBindViewHolder 中添加 TextWatcher,因为每次 onBindViewHolder 调用时您都会向小部件添加多个侦听器。

onCreateViewHolder 中设置您的监听器以仅添加一个监听器,然后当您希望将 setText 设置为 EditText 时,您可以通过 setTag 来查看

editText.setTag("system input");

然后在侦听器中检查视图的标签以确定它是用户输入还是系统输入 如果 tag=="system input" 完成你的工作并最终删除标签

view.setTag(null)

我刚刚根据下面的对话更改了我的答案。

首先,这是您的 XML 文件(我只是更改了视图的 ID,没有其他任何内容):

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="wrap_content">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="50dp"
        app:layout_constraintBottom_toBottomOf="parent"
        tools:ignore="MissingConstraints">

        <TextView
            android:id="@+id/tv2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="TextView2"
            android:textSize="16dp" />

        <TextView
            android:id="@+id/tv1"
            android:layout_width="wrap_content"
            android:layout_height="35dp"
            android:text="TextView1"
            android:textSize="16dp" />
        
        <com.google.android.material.textfield.TextInputEditText
            android:id="@+id/et2"
            android:layout_width="196dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:focusableInTouchMode="true"
            android:focusedByDefault="false"
            android:hint="hint" />

        <com.google.android.material.textfield.TextInputEditText
            android:id="@+id/et1"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:focusedByDefault="false"
            android:hint="hint" />

    </LinearLayout>

</androidx.constraintlayout.widget.ConstraintLayout>

这是你的适配器(我检查了一切,没有错误):

import android.content.Context
import android.text.Editable
import android.text.TextWatcher
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import androidx.recyclerview.widget.RecyclerView
import kotlinx.android.synthetic.main.list_item_view.view.*

class CustomAdapter(private val data : DataClass, private val context : Context) :
    RecyclerView.Adapter<CustomAdapter.ViewHolder>() {

    init {
        setHasStableIds(true)
    }


    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolder {

        val rowItem: View = LayoutInflater.from(context).inflate(R.layout.list_item_view, parent, false)

        return ViewHolder(rowItem)
    }

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

        holder.itemView.tv1.setText(data.list3[position])

        holder.itemView.et1.setText(data.list1[position])
        holder.itemView.et2.setText(data.list2[position])

        holder.itemView.et1.addTextChangedListener(object : TextWatcher {

            override fun afterTextChanged(p0: Editable?) {
                data.list1[position]= holder.itemView.et1.text.toString()
                // activity.fonction()
            }
            override fun beforeTextChanged(p0: CharSequence?, p1: Int, p2: Int, p3: Int) {
            }
            override fun onTextChanged(s: CharSequence?, start: Int, before: Int, count: Int) {
            }
        })
        holder.itemView.et2.addTextChangedListener(object : TextWatcher {

            override fun afterTextChanged(p0: Editable?) {
                data.list2[position] = holder.itemView.et2.text.toString()

                //this is instead of `fonction2()`
                holder.itemView.tv2.text = "?????"
                //fonction2()

                fonction3(position)
            }

            override fun beforeTextChanged(p0: CharSequence?, p1: Int, p2: Int, p3: Int) {
            }

            override fun onTextChanged(s: CharSequence?, start: Int, before: Int, count: Int) {
            }
        })
    }

    override fun getItemId(position: Int): Long {
        return position.toLong()
    }

    override fun getItemCount(): Int {
        return data.list1.size
    }

    inner class ViewHolder(rowItem: View) : RecyclerView.ViewHolder(rowItem) {

    }

    fun fonction3(position: Int) {
        if (position in 1..98) {
            data.list3[position] = (0.5 * (data.list2[position - 1].toDouble() + data.list2[position + 1].toDouble())).toString()
            //activity.Update()
        }
    }
}