How to get an MenuItem by id

Question

I have my menuItem on my res/menu/student_marks.xml file:

Answer 1

Menu optionsMenu;

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
       getMenuInflater().inflate(R.menu.main, menu);
       //  store the menu to var when creating options menu
       optionsMenu = menu;
    }

example: change icon on first menuItem (optionsMenu should be != null)

optionsMenu.getItem(0).setIcon(getResources()
    .getDrawable(R.drawable.ic_action_green));

Answer 2

If your menu inside NavigationView example:

<com.google.android.material.navigation.NavigationView 
    android:id="@+id/navigationView"
    android:layout_width="wrap_content"
    android:layout_height="match_parent"
    android:layout_gravity="start"
    app:menu="@menu/menu_layout" />

then you can find your menu item by id like this

NavigationView navigationView = findViewById(R.id.navigationView);
Menu menu = navigationView.getMenu();
MenuItem menuItem = menu.findItem(R.id.your_menu_item_id);

Answer 3

Menu optionsMenu;

@Override
public boolean onCreateOptionsMenu(Menu menu) {
   getMenuInflater().inflate(R.menu.main, menu);
   //  store the menu to var when creating options menu
   optionsMenu = menu;
}

And to get a menu item:

MenuItem item = optionsMenu.findItem(R.id. action_selected_year);