android add expand/collapse in navigation drawer menu

Question

Hey guys this is my navigation drawer menu items.

    NavigationView nav  = (NavigationView) findViewById(R.id.nav_view);
    final DrawerLayout drawerlayout = (DrawerLayout) 
    findViewById(R.id.drawer_layout);
    Menu menu = navigationView.getMenu();
    SubMenu sub = menu.addSubMenu("Menu 1");
    sub.add("Menu 1.1");
    sub.add("Menu 1.2");
    sub.add("Menu 1.3");
    drawerlaayout.closeDrawers();

This how i create menu items.now i Want to add Expand/collapse option in each menu items.Menu 1,Menu 2,Menu 3.

Answer 1

you could try these by doing r&d 1.try whether we can insert our custom layout for menu. if so, change the visibility of submenu. 2.direct drawable insert of icon into the menu.

if nothing helps try, 1.try with expandable recyclerview big nerd's library. obviously this will work. 2.click in the menu header.