How to create a Swipe View with Tabs in Kotlin

In this android kotlin source code example, we are going to create a Swipe View with Tabs 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 a Swipe View with Tabs 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.TabActivity14">

    <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>

MainActivity.kt

import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import androidx.fragment.app.Fragment
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 TabActivity14 : AppCompatActivity() {
    private var tabLayout: TabLayout? = null
    private var viewPager: ViewPager? = null

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_tab14)
        tabLayout = findViewById(R.id.tabs) as TabLayout
        viewPager = findViewById(R.id.viewpager) as ViewPager
        viewPager!!.setAdapter(MyAdapter(supportFragmentManager))
        tabLayout!!.post(Runnable { tabLayout!!.setupWithViewPager(viewPager) })

    }

    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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