In this android kotlin source code example, we are going to implement endless RecyclerView 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 implement endless RecyclerView 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.RecyclerViewActivity8"> <androidx.recyclerview.widget.RecyclerView android:id="@+id/list" android:layout_width="match_parent" android:layout_height="match_parent" app:layout_constraintTop_toTopOf="parent" app:layout_constraintBottom_toBottomOf="parent" app:layout_constraintStart_toStartOf="parent" app:layout_constraintEnd_toEndOf="parent"/> </androidx.constraintlayout.widget.ConstraintLayout>
MainActivity.kt
import androidx.appcompat.app.AppCompatActivity import android.os.Bundle import androidx.recyclerview.widget.RecyclerView import androidx.recyclerview.widget.LinearLayoutManager import com.bluapp.kotlinview.R import androidx.recyclerview.widget.DividerItemDecoration import android.widget.TextView import android.view.LayoutInflater import android.view.ViewGroup import android.widget.Toast import android.content.Context import android.view.View class RecyclerViewActivity8 : AppCompatActivity() { private var list: RecyclerView? = null private var recyclerAdapter: adapter? = null private var layoutManager: LinearLayoutManager? = null private val previousTotal = 0 private var loading = false private val visibleThreshold = 5 private var lastVisibleItemPosition: Int = 0 private var visibleItemCount: Int = 0 private var totalItemCount: Int = 0 override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_recycler_view8) list = findViewById(R.id.list) as RecyclerView val country = arrayListOf<String>() country.add("Nigeria"); country.add("China"); country.add("USA"); country.add("Ghana"); country.add("Canada"); country.add("Finland"); country.add("Denmark"); country.add("Argentina"); country.add("Andorra"); country.add("Angola"); country.add("Benin"); country.add("Brazil"); country.add("Chile"); country.add("Denmark"); country.add("Egypt"); country.add("Fiji"); country.add("France"); country.add("Togo"); layoutManager = LinearLayoutManager(this) list!!.setLayoutManager(layoutManager) recyclerAdapter = adapter(this@RecyclerViewActivity8, country) list!!.addItemDecoration(DividerItemDecoration(list!!.getContext(), layoutManager!!.orientation)) list!!.setAdapter(recyclerAdapter) list!!.addOnScrollListener(onScrollListener) } private val onScrollListener = object : RecyclerView.OnScrollListener() { override fun onScrollStateChanged(recyclerView: RecyclerView, newState: Int) { super.onScrollStateChanged(recyclerView, newState) } override fun onScrolled(recyclerView: RecyclerView, dx: Int, dy: Int) { super.onScrolled(recyclerView, dx, dy) visibleItemCount = layoutManager!!.getChildCount() totalItemCount = layoutManager!!.getItemCount() lastVisibleItemPosition = layoutManager!!.findLastVisibleItemPosition() if (!loading && lastVisibleItemPosition == totalItemCount - 1) { Toast.makeText(this@RecyclerViewActivity8, "The end, load next data", Toast.LENGTH_SHORT).show() loading = true } } } 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) } } } }
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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