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));