I’m creating this app by using GFG Social Media App Tutorial link I have completed first which “Splash screen and authentication part”. Now, I’m working on second part “Create Fragment Using Bottom Navigation” in this I’ve completed all the steps but in the last step (step-4) where i am using switch case, inside it where i’m using the id’s of menu items which is in res/menu/menu_nav.xml file i getting this error “Constant Expression Required.”

i will provide my three code:
1) DashboardActivity.java file

package com.example.socialmedia;

import android.os.Bundle;
import android.view.MenuItem;

import androidx.annotation.NonNull;
import androidx.appcompat.app.ActionBar;
import androidx.appcompat.app.AppCompatActivity;
import androidx.fragment.app.FragmentTransaction;

import com.google.android.material.bottomnavigation.BottomNavigationView;
import com.google.firebase.auth.FirebaseAuth;
import com.google.firebase.auth.FirebaseUser;

public class DashboardActivity extends AppCompatActivity {

    private FirebaseAuth firebaseAuth;
    FirebaseUser firebaseUser;
    String myuid;
    ActionBar actionBar;
    BottomNavigationView navigationView;
    private static final int MENU_HOME = R.id.nav_home;
    private static final int MENU_PROFILE = R.id.nav_profile;
    private static final int MENU_USERS = R.id.nav_users;
    private static final int MENU_CHAT = R.id.nav_chat;
    private static final int MENU_ADD_BLOGS = R.id.nav_addblogs;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_dashboard_acitivity);

        actionBar = getSupportActionBar();
        firebaseAuth = FirebaseAuth.getInstance();
        navigationView = findViewById(R.id.navigation);
        navigationView.setOnNavigationItemSelectedListener(selectedListener);
        actionBar.setTitle("Home");


        // When we open the application first
        // time the fragment should be shown to the user
        // in this case it is home fragment
        HomeFragment fragment = new HomeFragment();
        FragmentTransaction fragmentTransaction = getSupportFragmentManager().beginTransaction();
        fragmentTransaction.replace(R.id.content, fragment, "");
        fragmentTransaction.commit();
    }

    private final BottomNavigationView.OnNavigationItemSelectedListener selectedListener = new BottomNavigationView.OnNavigationItemSelectedListener() {
        @Override
        public boolean onNavigationItemSelected(@NonNull MenuItem menuItem) {
            switch (menuItem.getItemId()) {

                case MENU_HOME:
                    actionBar.setTitle("Home");
                    HomeFragment fragment = new HomeFragment();
                    FragmentTransaction fragmentTransaction = getSupportFragmentManager().beginTransaction();
                    fragmentTransaction.replace(R.id.content, fragment, "");
                    fragmentTransaction.commit();
                    return true;

                case MENU_PROFILE:
                    actionBar.setTitle("Profile");
                    ProfileFragment fragment1 = new ProfileFragment();
                    FragmentTransaction fragmentTransaction1 = getSupportFragmentManager().beginTransaction();
                    fragmentTransaction1.replace(R.id.content, fragment1);
                    fragmentTransaction1.commit();
                    return true;

                case MENU_USERS:
                    actionBar.setTitle("Users");
                    UsersFragment fragment2 = new UsersFragment();
                    FragmentTransaction fragmentTransaction2 = getSupportFragmentManager().beginTransaction();
                    fragmentTransaction2.replace(R.id.content, fragment2, "");
                    fragmentTransaction2.commit();
                    return true;

                case MENU_CHAT:
                    actionBar.setTitle("Chats");
                    ChatListFragment listFragment = new ChatListFragment();
                    FragmentTransaction fragmentTransaction3 = getSupportFragmentManager().beginTransaction();
                    fragmentTransaction3.replace(R.id.content, listFragment, "");
                    fragmentTransaction3.commit();
                    return true;

                case MENU_ADD_BLOGS:
                    actionBar.setTitle("Add Blogs");
                    AddBlogsFragment fragment4 = new AddBlogsFragment();
                    FragmentTransaction fragmentTransaction4 = getSupportFragmentManager().beginTransaction();
                    fragmentTransaction4.replace(R.id.content, fragment4, "");
                    fragmentTransaction4.commit();
                    return true;
            }
            return false;
        }
    };
}

 2) activity_dashboard_activity.xml file
    

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    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"
    android:gravity="center"
    android:orientation="vertical"
    tools:context=".DashboardActivity">

    <FrameLayout
        android:id="@+id/content"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1"></FrameLayout>

    <com.google.android.material.bottomnavigation.BottomNavigationView
        android:id="@+id/navigation"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_gravity="bottom"
        android:background="?android:attr/windowBackground"
        app:labelVisibilityMode="labeled"
        app:menu="@menu/menu_nav">

    </com.google.android.material.bottomnavigation.BottomNavigationView>

</LinearLayout>

 3) menu_nav.xml file 

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android">
    <item
        android:id="@+id/nav_home"
        android:icon="@drawable/baseline_home_24"
        android:title="Home" />
    <item
        android:id="@+id/nav_users"
        android:icon="@drawable/baseline_supervised_user_circle_24"
        android:title="Users" />
    <item
        android:id="@+id/nav_addblogs"
        android:icon="@drawable/baseline_add_circle_outline_24"
        android:title="Add Blogs" />

    <item
        android:id="@+id/nav_chat"
        android:icon="@drawable/baseline_chat_24"
        android:title="ChatList" />
    <item
        android:id="@+id/nav_profile"
        android:icon="@drawable/baseline_person_pin_24"
        android:title="Profile" />

</menu>

i just want to get over of this error. If somebody know about this please give me a solution or if you need something just tell me what it is….