How to add long click listener on Tab in Kotlin

In this android kotlin source code example, we are going to add long click listener on Tab 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 long click listener on Tab 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.TabActivity15">

    <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 android.os.Handler
import android.widget.LinearLayout
import android.widget.Toast
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 TabActivity15 : AppCompatActivity() {
    private var tabLayout: TabLayout? = null
    private var viewPager: ViewPager? = null

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_tab15)
        tabLayout = findViewById(R.id.tabs) as TabLayout
        viewPager = findViewById(R.id.viewpager) as ViewPager
        viewPager!!.setAdapter(MyAdapter(supportFragmentManager))
        tabLayout!!.post(Runnable { tabLayout!!.setupWithViewPager(viewPager) })
        getcurrenttabposition(tabLayout!!)
    }

    private fun getcurrenttabposition(mTabLayout: TabLayout) {
        Handler().postDelayed(Runnable {
            val tabStrip = mTabLayout.getChildAt(0) as LinearLayout
            for (i in 0 until tabStrip.childCount){
                tabStrip.getChildAt(i).setOnLongClickListener {
                    Toast.makeText(this@TabActivity15, "Tab LongClick", Toast.LENGTH_LONG).show()
                    true
                }
            }
        }, 100)
    }

    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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