Navigation not working anymore, Error: Ignoring popBackStack to destination as it was not found on the current back stack

Question

突然间，我的应用程序中的导航突然无法正常工作了（昨天确实有效）。

这是一个示例：当我从 userLoggedInFragment 导航到 userLoggedOutFragment 时，使用参数 app:popUpTo="@id/userLoggedOutFragment" app:popUpToInclusive="true" 然后单击后退按钮，它仍然将我导航回 userLoggedInFragment 即使我使用 popUpTo。然后我得到信息：

I/NavController: Ignoring popBackStack to destination com.example.app:id/userLoggedOutFragment as it was not found on the current back stack

这是我的片段代码

UserLoggedInFragment

@AndroidEntryPoint
class UserLoggedInFragment : Fragment() {
    private var _binding: FragmentUserLoggedInBinding? = null
    private val binding: FragmentUserLoggedInBinding get() = _binding!!
    private val viewModel: LogoutViewModel by viewModels()

    override fun onCreateView(
        inflater: LayoutInflater,
        container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View {
        _binding = FragmentUserLoggedInBinding.inflate(inflater, container, false)
        return binding.root
    }

    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
        super.onViewCreated(view, savedInstanceState)

        binding.lifecycleOwner = viewLifecycleOwner

        binding.btnLogout.btnNext.setOnClickListener { 
          findNavController().navigate(
                UserLoggedInFragmentDirections.actionUserLoggedInFragmentToUserLoggedOutFragment()
            ) 
        }
    }
    override fun onDestroyView() {
        super.onDestroyView()
        _binding = null
    }
}

导航图

<fragment
    android:id="@+id/userLoggedInFragment"
    android:name="com.example.app.framework.ui.view.fragment.user.UserLoggedInFragment"
    tools:layout="@layout/fragment_user_logged_in">

    <action
        android:id="@+id/action_userLoggedInFragment_to_userLoggedOutFragment"
        app:destination="@id/userLoggedOutFragment"
        app:popUpTo="@id/userLoggedOutFragment"
        app:popUpToInclusive="true" />
</fragment>

我在使用 popUpTo 和 popUpToIncluse="true" 的许多其他片段中也有这个。我做错了什么？？

Answer 1

我找到了解决方案：问题是我不应该弹出到我导航到的同一个目的地，因为片段永远不会在后台堆栈中。相反，您应该在单击后退按钮时弹出您想要显示的片段。就我而言，这将是我的开始目的地。主页片段：

<action
    android:id="@+id/action_userLogInRegistrationFragment_to_userLoggedInFragment"
    app:destination="@id/userLoggedInFragment"
    app:popUpTo="@id/homeFragment" />