导航组件:导航抽屉的切换菜单(适用于已登录的用户) [英] Navigation Components: Switch Menu of Navigation Drawer (for logged in users)

问题描述

我正在使用新的Navigation Components库.我有一个可以正常工作的导航抽屉.

I am using the new Navigation Components library. I have a Navigation Drawer in place that works perfectly fine.

如果我的用户登录，我想更改导航抽屉的菜单.具体来说，我想将一个片段中的登录"项更改为注销".

If my user logs in I want to change the menu of the Navigation Drawer. Specifically, I want to change the "Login" item to "Logout" from within a fragment.

我在网上找到的所有解决方案均未使用导航组件.因此，他们推荐了这样的内容:

All the solutions I found online didn't use Navigation Components. So therefore, they recommended something like this:

// Get the navigationView and swap the menu
NavigationView navigationView = view.findViewById(R.id.nav_view);
navigationView.getMenu().clear();
navigationView.inflateMenu(R.menu.activity_main_drawer_logged_in);

但是，在我看来，这似乎不起作用(我无法从片段中获取navigationView).导航组件如何实现这一目标?

However, this doesn't seem to work in my case (I cannot get the navigationView from within a fragment). How does one achieve this with Navigation Components?

推荐答案

您可以通过界面从 Fragment 访问活动:

You can access Activity from Fragment through interface:

1. 创建并说出LoginSuccessListener
2. 在您的Activity
中实现
3. 内部片段在onAttach
中接收此侦听器
4. 根据需要使用它来更新Navigation Menu

1. Create and interface say LoginSuccessListener
2. Implements this in your Activity
3. Inside fragment receive this listener inside onAttach
4. Use it as you needed to update Navigation Menu

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