How to create empty RecyclerView adapter in Kotlin

In this android kotlin source code example, we are going to create empty RecyclerView adapter in Kotlin.

You can copy and adopt this source code example to your Kotlin android project without reinventing the wheel.

Below is a step by step source code to create empty RecyclerView adapter in Kotlin.

activity_main.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=".recyclerView.RecyclerViewActivity17">

    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/list"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:visibility="visible"/>

    <TextView
        android:id="@+id/empty"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Data is empty"
        android:textStyle="bold"
        android:textSize="20sp"
        android:textColor="@color/colorAccent"
        android:visibility="gone"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintBottom_toBottomOf="parent"/>


</androidx.constraintlayout.widget.ConstraintLayout>

MainActivity.kt

import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.view.View
import androidx.recyclerview.widget.RecyclerView
import android.widget.TextView
import com.bluapp.kotlinview.R
import androidx.recyclerview.widget.DividerItemDecoration
import androidx.recyclerview.widget.LinearLayoutManager
import android.view.LayoutInflater
import android.view.ViewGroup
import android.content.Context


class RecyclerViewActivity17 : AppCompatActivity() {
    private var list: RecyclerView? = null
    private var emptyData: TextView? = null
    private var recyclerAdapter: adapter? = null

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_recycler_view17)
        list = findViewById(R.id.list) as RecyclerView
        emptyData = findViewById(R.id.empty) as TextView
        val country = arrayListOf<String>()

        if (country.isEmpty()) {
            list!!.setVisibility(View.GONE)
            emptyData!!.setVisibility(View.VISIBLE)
        } else {
            emptyData!!.setVisibility(View.GONE)
            list!!.setVisibility(View.VISIBLE)
        }
        val layoutManager = LinearLayoutManager(this)
        list!!.setLayoutManager(layoutManager)
        recyclerAdapter = adapter(this@RecyclerViewActivity17, country)
        list!!.addItemDecoration(DividerItemDecoration(list!!.getContext(), layoutManager.orientation))
        list!!.setAdapter(recyclerAdapter)
    }

    private inner class adapter(internal var context: Context, internal var mData: List<String>) : RecyclerView.Adapter<adapter.myViewHolder>() {
        override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): adapter.myViewHolder {
            val view =
                LayoutInflater.from(context).inflate(R.layout.recyclerview_adapter1, parent, false)
            return myViewHolder(view)
        }
        override fun onBindViewHolder(holder: adapter.myViewHolder, position: Int) {
            holder.country.text = mData[position]
        }
        override fun getItemCount(): Int {
            return mData.size
        }
        inner class myViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView) {
            internal var country: TextView
            init {
                country = itemView.findViewById(R.id.country) as TextView
            }
        }
    }

}

recyclerview_adapter1.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:padding="10dp">

    <TextView
        android:id="@+id/country"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:text="Country"
        android:textColor="#000000"
        android:textSize="18sp"
        android:textStyle="bold" />

</RelativeLayout>

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