How to add Tablayout inside Fragment in Kotlin

In this android kotlin source code example, we are going to add Tablayout inside Fragment 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 add Tablayout inside Fragment 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=".Tab.TabActivity16">

    <FrameLayout
        android:id="@+id/frame"
        android:layout_width="match_parent"
        android:layout_height="match_parent"/>


</androidx.constraintlayout.widget.ConstraintLayout>

MainActivity.kt

import android.os.Bundle
import androidx.appcompat.app.AppCompatActivity
import androidx.fragment.app.FragmentManager
import androidx.fragment.app.FragmentTransaction
import com.bluapp.kotlinview.R


class TabActivity16 : AppCompatActivity() {
    private val Tag = "Home"

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_tab16)
        val mFragmentManager: FragmentManager = supportFragmentManager
        val fragmentTransaction: FragmentTransaction = mFragmentManager.beginTransaction()
        fragmentTransaction.replace(R.id.frame, TabFragment2(), Tag).commit()
    }
}

fragment_tab_fragment2.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=".Tab.TabFragment2">

    <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.viewpager.widget.ViewPager
        android:id="@+id/viewpager"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        app:layout_constraintTop_toBottomOf="@id/tabs"/>

</androidx.constraintlayout.widget.ConstraintLayout>

TabFragment2.kt

import android.content.Context
import android.net.Uri
import android.os.Bundle
import androidx.fragment.app.Fragment
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import androidx.fragment.app.FragmentManager
import androidx.fragment.app.FragmentPagerAdapter
import androidx.viewpager.widget.ViewPager

import com.bluapp.kotlinview.R
import com.google.android.material.tabs.TabLayout

class TabFragment2 : Fragment() {
    private var tabLayout: TabLayout? = null
    private var viewPager: ViewPager? = null

    override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
     val view = inflater.inflate(R.layout.fragment_tab_fragment2, container, false)
        tabLayout = view.findViewById(R.id.tabs) as TabLayout
        viewPager = view.findViewById(R.id.viewpager) as ViewPager
        viewPager!!.setAdapter(MyAdapter(fragmentManager))
        tabLayout!!.post(Runnable { tabLayout!!.setupWithViewPager(viewPager) })
        return view
    }

    private inner class MyAdapter(fm: FragmentManager?) : FragmentPagerAdapter(fm!!, FragmentPagerAdapter.BEHAVIOR_RESUME_ONLY_CURRENT_FRAGMENT) {
        private val int_items = 5;

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

        override fun getCount(): Int {
            return int_items
        }

        override fun getPageTitle(position: Int): CharSequence? {
            when (position) {
                0 -> return "TabLayout1"
                1 -> return "TabLayout2"
                2 -> return "TabLayout3"
                3 -> return "TabLayout4"
                4 -> return "TabLayout5"
            }
            return null
        }
    }

}

fragment_tab.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=".Tab.TabFragment">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="TabFragment"
        android:textSize="20sp"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintBottom_toBottomOf="parent"/>


</androidx.constraintlayout.widget.ConstraintLayout>

TabFragment.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 TabFragment : Fragment() {


    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)

    }

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

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