MenuProvider

MainActivity.kt 

import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle

class MainActivity : AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        supportFragmentManager
            .beginTransaction()
            .replace(R.id.host, MainFragment.newInstance())
            .commit()
    }

}

MainFragment.kt 

import android.os.Bundle
        import android.view.LayoutInflater
        import android.view.Menu
        import android.view.MenuInflater
        import android.view.MenuItem
        import android.view.View
        import android.view.ViewGroup
        import android.widget.Toast
        import androidx.core.view.MenuProvider
        import androidx.fragment.app.Fragment


class MainFragment : Fragment(), MenuProvider{

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

    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
        super.onViewCreated(view, savedInstanceState)
        requireActivity().addMenuProvider(this, viewLifecycleOwner)
    }

    companion object {
        @JvmStatic
        fun newInstance() = MainFragment()
    }

    override fun onCreateMenu(menu: Menu, menuInflater: MenuInflater) {
        menuInflater.inflate(R.menu.main_menu, menu)
    }

    override fun onMenuItemSelected(menuItem: MenuItem): Boolean {
        when(menuItem.itemId){
            R.id.chat -> {
                Toast.makeText(requireContext(), "Chat", Toast.LENGTH_SHORT).show()
            }
            R.id.alarm -> {
                requireActivity().supportFragmentManager
                    .beginTransaction()
                    .replace(R.id.host, AlarmFragment.newInstance())
                    .commit()
            }
            R.id.cold -> {
                Toast.makeText(requireContext(), "Cold", Toast.LENGTH_SHORT).show()
            }
        }
        return true
    }
}

AlarmFragment.kt 

import android.os.Bundle
        import androidx.fragment.app.Fragment
        import android.view.LayoutInflater
        import android.view.Menu
        import android.view.MenuInflater
        import android.view.MenuItem
        import android.view.View
        import android.view.ViewGroup
        import android.widget.Toast
        import androidx.core.view.MenuProvider


class AlarmFragment : Fragment(), MenuProvider {


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

    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
        super.onViewCreated(view, savedInstanceState)
        requireActivity().addMenuProvider(this, viewLifecycleOwner)
    }

    companion object {
        @JvmStatic
        fun newInstance() = AlarmFragment()
    }

    override fun onCreateMenu(menu: Menu, menuInflater: MenuInflater) {
        menuInflater.inflate(R.menu.alarm_menu, menu)
    }

    override fun onMenuItemSelected(menuItem: MenuItem): Boolean {
        when(menuItem.itemId){
            R.id.android -> {
                Toast.makeText(requireContext(), "Android", Toast.LENGTH_SHORT).show()
            }
            R.id.bank -> {
                requireActivity().supportFragmentManager
                    .beginTransaction()
                    .replace(R.id.host, MainFragment.newInstance())
                    .commit()
            }
        }
        return true
    }
}

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:id="@+id/host"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity" />

fragment_main.xml 

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout 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"
tools:context=".MainFragment">

<!-- TODO: Update blank fragment layout -->
<TextView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center"
android:text="MainFragment" />

</FrameLayout>

fragment_alarm.xml 

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout 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"
tools:context=".AlarmFragment">

<!-- TODO: Update blank fragment layout -->
<TextView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center"
android:text="Alarm fragment" />

</FrameLayout>

main_menu.xml 

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto">
<item
android:id="@+id/chat"
android:title="Chat"
android:icon="@drawable/chat"
app:showAsAction="ifRoom"
/>
<item
android:id="@+id/alarm"
android:title="Alarm"
android:icon="@drawable/alarm"
app:showAsAction="ifRoom"
/>
<item
android:id="@+id/cold"
android:title="Cold"
android:icon="@drawable/cold"
app:showAsAction="ifRoom"
/>
</menu>

alarm_menu.xml 

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto">
<item
android:id="@+id/android"
android:title="Android"
android:icon="@drawable/android"
app:showAsAction="ifRoom"
/>
<item
android:id="@+id/bank"
android:title="Bank"
android:icon="@drawable/bank"
app:showAsAction="ifRoom"
/>
</menu>

themes.xml 

<resources xmlns:tools="http://schemas.android.com/tools">
<!-- Base application theme. -->
<style name="Base.Theme.MenuProvider" parent="Theme.Material3.DayNight">
<!-- Customize your light theme here. -->
<!-- <item name="colorPrimary">@color/my_light_primary</item> -->
</style>

<style name="Theme.MenuProvider" parent="Base.Theme.MenuProvider" />
</resources>

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