导航组件Kotlin-从当前目的地找不到 [英] Navigation component Kotlin - cannot be found from the current destination

问题描述

我有一个片段A，B，C.从A->导航时还可以.B，但来自B->C崩溃了.

I have a fragment A,B,C. Its okay when navigating from A -> B, but from B -> C it crashes.

这是我的导航

这是我的导航代码

 categoryProductItemListAdapter.setOnItemClickListener {
        val action = CategoryProductItemsDirections.actionCategoryProductItems2ToProductItem(null, it)
        navController = Navigation.findNavController(requireView())
        navController?.navigateUp()
        navController?.navigate(action)
    }

这是productItem目的地的XML代码

Here is the XML code for the destination to productItem

<fragment
    android:id="@+id/categoryProductItems2"
    android:name="com.sample.store.main.dashboard.ui.ui.home.categoryitems.CategoryProductItems"
    android:label="CategoryProductItems"
    tools:layout="@layout/fragment_category_product_items">
    <argument
        android:name="category_global"
        app:argType="com.sample.store.data.globalmodels.response.categories.Category" />
    <action
        android:id="@+id/action_categoryProductItems2_to_productItem"
        app:destination="@id/productItem"
        app:enterAnim="@anim/enter_from_right"
        app:exitAnim="@anim/exit_to_right"
        app:popEnterAnim="@anim/fragment_open_enter"
        app:popExitAnim="@anim/fragment_fade_exit" />
</fragment>

这是错误:

java.lang.IllegalArgumentException: Navigation action/destination com.sample.store.full:id/action_categoryProductItems2_to_productItem cannot be found from the current destination Destination(id/navigation_home) label=Home class=com.sample.store.main.dashboard.ui.ui.home.mainui.HomeFragment

我不知道发生了什么，但似乎navController正在寻找"navigation_home"

I don't know what happened, but it seems that the navController is looking for the "navigation_home"

推荐答案

首先，在尝试检索Nav控制器时，您不应传递 requireView()- navController = Navigation.findNavController(requireView()).您应该传递实际的Navigation Host Fragment实例.

Firstly you should not pass requireView() when trying to retrieve your Nav controller - navController = Navigation.findNavController(requireView()). You should be passing the actual Navigation Host Fragment instance.

第二个原因是由于您试图从B调用导航路径而引起的.C，在片段A上.

Secondly the issue is being caused because you are trying to call a Navigation path from B -> C, when on fragment A.

您的方向路径来自B->C

Your direction path is from B -> C

val action = CategoryProductItemsDirections.actionCategoryProductItems2ToProductItem(null, it)

但是您首先要向上导航，所以实际上在尝试执行导航时您现在位于Fragment A上:

But you navigate up first so you are actually now on Fragment A when trying to execute the navigation:

navController?.navigateUp()
navController?.navigate(action)

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