how to create bottom navigation bar with webview (next,previous,refresh) no item selected

AndroidBottomNavBarMenuWebview.doc

//create new menu resource file bottom_nav_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:title="Home"
        android:id="@+id/home"
        android:icon="@drawable/ic_baseline_home_24"
        app:itemIconTint="@color/black"
        app:itemTextColor="#000000"
        />

    <item android:title="previous"
        android:id="@+id/prev"
        android:icon="@drawable/ic_baseline_arrow_back_24"
        app:itemIconTint="@color/black"
        app:itemTextColor="#000000"
        />
    <item android:title="next"
        android:id="@+id/next"
        android:icon="@drawable/ic_baseline_arrow_forward_24"
        app:itemIconTint="@color/black"
        app:itemTextColor="#000000"
        />
    <item android:title="reload"
        android:id="@+id/reload"
        android:icon="@drawable/ic_baseline_refresh_24"
        app:itemIconTint="@color/black"
        app:itemTextColor="#000000"
        />
    <item android:id="@+id/none"
        android:title=""
        android:visible="false"/>
</menu>

//add BottomNavigationView to Activity
  <com.google.android.material.bottomnavigation.BottomNavigationView
        android:id="@+id/bottom_nav_menu"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_weight="6"
        app:menu="@menu/bottom_nav_menu"
        />
        
        //inside java file
        BottomNavigationView bottomNavigationView;
        bottomNavigationView=findViewById(R.id.bottom_nav_menu);
        //seleted invisible items
        bottomNavigationView.setSelectedItemId(R.id.none);
         bottomNavigationView.setOnNavigationItemSelectedListener(new BottomNavigationView.OnNavigationItemSelectedListener() {
            @Override
            public boolean onNavigationItemSelected(@NonNull MenuItem item) {
                switch (item.getItemId()){
                    case R.id.home:
                        webView.loadUrl(url);
                        break;
                    case R.id.prev:
                        onBackPressed();
                        break;
                    case R.id.next:
                        if (webView.canGoForward()){
                            webView.goForward();
                        }
                        else{
                            Toast.makeText(MainActivity.this, "sorry unable to go next", Toast.LENGTH_SHORT).show();
                        }
                        break;
                    case R.id.reload:
                        webView.reload();
                        break;
                }
                return true;
            }
        });
        
        
           @Override
    public void onBackPressed() {
        if (webView.canGoBack()){
            webView.goBack();
        }
        else{
                      new AlertDialog.Builder(this)
                  .setCancelable(false)
                  .setTitle("Exit App!")
                  .setMessage("Are you sure to exit app!")
                  .setNegativeButton("no", null)
                              .setPositiveButton("sure", new DialogInterface.OnClickListener() {
                          @Override
                          public void onClick(DialogInterface dialog, int which) {
                              finishAffinity();
                          }
                      }).show();
        }
    }