How to add a collapsible menu item inside navigation drawer in android?

Question

I have a DrawerLayout enclosing a NavigationView and this layout activity serves as a common Navigation drawer for all the activities in my app. I am p

Answer 1

there is a trick to do this without using ExpandableListView.Add those menu items normally in menu layout file and hide/show them on item click of menu item under which you want to show them like this:

 public boolean onNavigationItemSelected(MenuItem item) {
        // Handle navigation view item clicks here.

        NavigationView nv= (NavigationView) findViewById(R.id.nav_view);
        Menu m=nv.getMenu();
        int id = item.getItemId();
        if (id == R.id.nav_posts) {
            boolean b=!m.findItem(R.id.nav_class).isVisible();
            //setting submenus visible state
            m.findItem(R.id.nav_class).setVisible(b);
            m.findItem(R.id.nav_dept).setVisible(b);
            m.findItem(R.id.nav_batch).setVisible(b);
            m.findItem(R.id.nav_campus).setVisible(b);
            return true;
        } else if (id == R.id.nav_walls) {
            boolean b=!m.findItem(R.id.nav_wall_events).isVisible();
            //setting submenus visible state
            m.findItem(R.id.nav_wall_events).setVisible(b);
            m.findItem(R.id.nav_wall_fun).setVisible(b);
            m.findItem(R.id.nav_wall_hadith).setVisible(b);
            m.findItem(R.id.nav_wall_news).setVisible(b);
            m.findItem(R.id.nav_wall_Poetry).setVisible(b);
            return true;
        } else if (id == R.id.nav_com) {

            m.findItem(R.id.nav_share).setVisible(false);
            m.findItem(R.id.nav_send).setVisible(false);

        } else if (id == R.id.nav_share) {

        } else if (id == R.id.nav_send) {

        }
        DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
        drawer.closeDrawer(GravityCompat.START);
        return true;
    }

where menu layout file is: