如何以编程方式隐藏导航抽屉菜单项？

Question

我想隐藏导航抽屉菜单中的菜单项并根据使用应用程序的用户类型显示它,根据下面的代码菜单项返回null:

DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
    ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
            this, drawer, toolbar, R.string.navigation_drawer_open,R.string.navigation_drawer_close);
    drawer.setDrawerListener(toggle);
    toggle.syncState();

    MenuItem target = (MenuItem)drawer.findViewById(R.id.nav_target);

    target.setVisible(false);

Answer 1

通过创建菜单和使用来修复它

menu.findItem(R.id.nav_target)

正如@ droid8421所说.

固定代码:

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);