Android导航组件+登录流程+嵌套BottomNavigationView [英] Android Navigation Component + Login Flow + Nested BottomNavigationView

问题描述

我正在努力用Android导航组件构建一个导航，如下图所示。

I'm struggle building a Navigation, like on the image below, with the Android Navigation Component.

我需要一个登录流程，检查用户是否已登录，然后导航到应用程序的主要部分（还清除了堆栈）。主要部分包含一个带有三个选项卡的BottomNavigationView。但是，如果我单击工具栏上的设置图标，我还想显示全屏的SettingsFragment。

I need a "Login Flow", check if the user is logged in and then navigate to the main part of the app (also clearing the backstack). The main part contains a BottomNavigationView with three tabs. But if I click on a settings icon on the toolbar, I also want to display a fullscreen SettingsFragment.

我是否需要两个带有单独导航图的NavHostFragments？如果是，我如何将它们结合起来并拥有适当的backNavigation？

Did I need two NavHostFragments with separate navigation graphs? If yes, how can I combine them and also have a proper backNavigation?

有什么想法可以通过android导航组件实现这种导航吗？

Any ideas how realize a navigation like this with the android navigation components?

推荐答案

首先，您可以检查条件导航

第二，您只需一个 nav_graph 即可完成。但是您只需要一个 Activity 即可。之后，您可以像这样检查它：

Second of all, you can do it with only one nav_graph. But you need only one Activity for this. After that, you can check in it like this:

navController.addOnDestinationChangedListener { _, destination, _ ->
         if(destination.id == R.id.mainFragment){
             if(userIsLoggedIn()){
              //start LoginFragment
              //hide bottom navigation
             }else{
                //show bottom navigation
             }
          } 
        }

但是您的入门片段应该是 MainFragment 而不是 LoginFragment

But your starter fragment should be MainFragment and not LoginFragment

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