How to hide a navigation drawer menu item programmatically?

Fixed it by creating a menu and using

menu.findItem(R.id.nav_target)

as @droid8421 suggested.

Fixed Code:

NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
    navigationView.setNavigationItemSelectedListener(this);

Menu menu =navigationView.getMenu();

MenuItem target = menu.findItem(R.id.nav_target);

target.setVisible(false);