How to use TabLayout with ViewPager2 in Kotlin

In this android kotlin source code example, we are going to use TabLayout with ViewPager2 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 use TabLayout with ViewPager2 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=".ViewPager.ViewPagerActivity15">

    <com.google.android.material.tabs.TabLayout
        android:id="@+id/tabs"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="@color/material_blue_grey_800"
        app:tabGravity="fill"
        app:tabIndicatorColor="@color/colorPrimary"
        app:tabMode="scrollable"
        app:tabSelectedTextColor="@color/colorPrimary"
        app:tabTextColor="@color/white"
        app:layout_constraintTop_toTopOf="parent"/>

    <androidx.viewpager2.widget.ViewPager2
        android:id="@+id/viewpager"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        app:layout_constraintTop_toBottomOf="@id/tabs"
        app:layout_constraintBottom_toBottomOf="parent"/>

</androidx.constraintlayout.widget.ConstraintLayout>

MainActivity.kt

import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import androidx.fragment.app.Fragment
import androidx.fragment.app.FragmentManager
import androidx.lifecycle.Lifecycle
import androidx.viewpager2.adapter.FragmentStateAdapter
import androidx.viewpager2.widget.ViewPager2
import com.bluapp.kotlinview.R
import com.google.android.material.tabs.TabLayout
import com.google.android.material.tabs.TabLayoutMediator

class ViewPagerActivity15 : AppCompatActivity() {
    private var tabLayout: TabLayout? = null
    private var viewPager: ViewPager2? = null

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_view_pager15)
        tabLayout = findViewById(R.id.tabs) as TabLayout
        viewPager = findViewById(R.id.viewpager) as ViewPager2
        viewPager!!.setAdapter(MyAdapter(supportFragmentManager, lifecycle))
        TabLayoutMediator(tabLayout!!, viewPager!!, TabLayoutMediator.TabConfigurationStrategy{tab, position ->
            when (position) {
                0 -> tab.text = "TabLayout1"
                1 -> tab.text = "TabLayout2"
                2 -> tab.text = "TabLayout3"
                3 -> tab.text = "TabLayout4"
                4 -> tab.text = "TabLayout5"
            }
        }).attach()
    }

    private inner class MyAdapter(fm: FragmentManager?, lifecycle: Lifecycle) : FragmentStateAdapter(fm!!, lifecycle) {
        private val int_items = 5

        override fun createFragment(position: Int): Fragment {
            var fragment: Fragment? = null
            when (position) {
                0 -> fragment = ViewPagerFragment()
                1 -> fragment = ViewPagerFragment()
                2 -> fragment = ViewPagerFragment()
                3 -> fragment = ViewPagerFragment()
                4 -> fragment = ViewPagerFragment()
            }
            return fragment!!
        }

        override fun getItemCount(): Int {
            return int_items
        }

    }
}

fragment_view_pager.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#000000"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    tools:context=".ViewPager.ViewPagerFragment">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="ViewPagerFragment"
        android:textSize="20sp"
        android:textColor="@color/white"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintBottom_toBottomOf="parent"/>

</androidx.constraintlayout.widget.ConstraintLayout>

ViewPagerFragment.kt

import android.os.Bundle
import androidx.fragment.app.Fragment
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import com.bluapp.kotlinview.R

class ViewPagerFragment : Fragment() {
    override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
        // Inflate the layout for this fragment
        return inflater.inflate(R.layout.fragment_view_pager, container, false)
    }
}

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