Kotlin recyclerview row item selection background color change

[masood cmpy]

I am able to change the color of the text and background of row clicked of my recyclerview in my recyclerview.
But my problem is after clicking for example on the 2th item,the 10st item also gets selected.Likewise after clicking my 5th item the 3nd item is selected.

How do i solve this?
in fact my question is that how to change background color of recyclerview item that click on it in Kotlin?
AllChanelAdapter.kt

class AllChanelAdapter(private val datalist:MutableList<AllChanelModel>, var clickListener: OnItemClickListener):RecyclerView.Adapter<AllChanelHolder>() {
    private lateinit var context:Context
    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): AllChanelHolder {
        context = parent.context
        return AllChanelHolder(LayoutInflater.from(context).inflate(R.layout.allchanel_singleitem,parent,false))
    }
    override fun getItemCount(): Int = datalist.size

    override fun onBindViewHolder(holder: AllChanelHolder, position: Int) {
        val data = datalist[position]
        val txt_title = holder.itemView.txt_title
        val txt_body = holder.itemView.txt_body
        val img_chanel = holder.itemView.img_chanel

        txt_title.setText(data.title)
        txt_body.setText(data.body)

        Glide
            .with(context)
            .load("...")
            .centerCrop()
            .into(img_chanel);
    }
    holder.initialize(datalist.get(position),clickListener)
}
interface OnItemClickListener {
    fun onItemClick(item: AllChanelModel, position: Int, view: View)
}

AllChanelHolder.kt

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

    fun initialize(item:AllChanelModel,action:OnItemClickListener){
        itemView.setOnClickListener {
            action.onItemClick(item,adapterPosition,itemView)
        }
    }
}

MainPageActivity.kt

class MainPageActivity : AppCompatActivity(),OnItemClickListener {

    private val datalist:MutableList<AllChanelModel> = mutableListOf()
    lateinit var allchaneladapter : AllChanelAdapter
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main_page)
        
        send_request()

        allchaneladapter = AllChanelAdapter(datalist,this)
        all_chanel_recycler.layoutManager = LinearLayoutManager(this)
        all_chanel_recycler.adapter = allchaneladapter
    }

    private fun send_request(){
        val url = "http://10.0.2.2:8000/getsamplejson" // localhost api
        val que = Volley.newRequestQueue(this@MainPageActivity)
        val req = JsonArrayRequest(Request.Method.GET,url,null,
            Response.Listener {
                response->
                for(i in 0..response.length()-1){
                    var chanel_obj = response.getJSONObject(i)
                    datalist.add(
                        AllChanelModel(
                            chanel_obj.getString("body"),
                            chanel_obj.getString("title"),
                            chanel_obj.getString("userId")
                        )
                    )
                }
                allchaneladapter.notifyDataSetChanged()
            }, Response.ErrorListener {
                error->
                   Log.e("",error.message)
            })

            que.add(req)
    }
    override fun onItemClick(item: AllChanelModel, position: Int, view: View) {
        view.setBackgroundColor(Color.YELLOW)
    }
}

AllChanelModel.kt

data class AllChanelModel(
    @SerializedName("body")
    val body: String,
    @SerializedName("title")
    val title: String,
    @SerializedName("userId")
    val userId: String
    )

activity_main_page.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="match_parent"

    tools:context=".MainPageActivity">

    <androidx.recyclerview.widget.RecyclerView

        android:id="@+id/all_chanel_recycler"

        android:layout_width="match_parent"

        android:layout_height="match_parent" />
</androidx.constraintlayout.widget.ConstraintLayout>

allchanel_singleitem.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    xmlns:app="http://schemas.android.com/apk/res-auto"

    android:layout_width="match_parent"

    android:layout_height="wrap_content"

    android:orientation="horizontal">

    <LinearLayout

        android:id="@+id/linear_content"

        android:layout_width="match_parent"

        android:layout_height="match_parent"

        android:layout_weight="3"

        android:orientation="vertical"

        android:padding="5dp">

        <TextView

            android:id="@+id/txt_title"

            android:layout_width="match_parent"

            android:layout_height="wrap_content"

            android:gravity="right"

            android:text="TextView"

            android:textColor="#000000" />

        <TextView

            android:id="@+id/txt_body"

            android:layout_width="match_parent"

            android:layout_height="wrap_content"

            android:gravity="center|right"

            android:text="TextView"

            android:textColor="#000000" />

    </LinearLayout>

    <ImageView

        android:id="@+id/img_chanel"

        android:layout_width="80dp"

        android:layout_height="80dp"

        android:layout_weight="1"

        app:srcCompat="@mipmap/ic_launcher" />

</LinearLayout>

please help me
thank you

[Randy Tong]

masood cmpy wrote:But my problem is after clicking for example on the 2th item,the 10st item also gets selected.Likewise after clicking my 5th item the 3nd item is selected.

How you know the 10th item gets selected when you click on 2th item ? Are they changing the background color to yellow too ?
Check the position value, are the position value printed is same as the position you clicked?

[masood cmpy]

Randy Tong wrote:

masood cmpy wrote:But my problem is after clicking for example on the 2th item,the 10st item also gets selected.Likewise after clicking my 5th item the 3nd item is selected.

How you know the 10th item gets selected when you click on 2th item ? Are they changing the background color to yellow too ?
Check the position value, are the position value printed is same as the position you clicked?

because whene i clicke on 2th item, background of 2th item is changed But background of another item(for example 10th) is changed too!!!
yes they are changing the background color to yellow too !!!
Check the position value, are the position value printed is same as the position you clicked? ========> Yes same are