导航组件popUpTo错误

问题描述

最近，我遇到了一个有关此处

Recently I ran into issue that I asked about here

但是当试图弄清楚发生了什么时，我总是偶然发现相同的问题.

But when trying to figure out what's happening I always stumble on the same problem.

这就是我所拥有的-我有一个收藏集，预览，编辑片段，而不需要在它们之间导航.

Here's what I have - I have a collection, preview, edit fragments than I need to navigate between.

但是在从编辑片段导航到预览片段之后，我希望后退按钮将用户带到收集片段而不是编辑片段，并且这样做，但是在尝试进一步导航时会崩溃，因为据说目标是(view_fragment ).为什么会这样，这是某种错误吗?

But after navigating from edit fragment to preview fragment I want the back button to take user to collection fragment instead of edit fragment, and it does that, but when trying to navigate further it crashes because the destination is said to be (view_fragment). Why is that, is it some sort of bug?

<fragment android:id="@+id/collection_fragment">
    <action
        android:id="@+id/action_collection_fragment_to_view_fragment"
        app:destination="@+id/view_fragment" />
</fragment>

<fragment android:id="@+id/view_fragment">
    <action
        android:id="@+id/action_view_fragment_to_edit_fragment"
        app:destination="@id/edit_fragment" />
    <argument android:name="item" />
</fragment>

<fragment android:id="@+id/edit_fragment">
    <action
        android:id="@+id/action_edit_fragment_to_view_fragment"
        app:destination="@id/view_fragment"
        app:popUpTo="@id/collection_fragment" />
    <argument android:name="item" />
</fragment>

堆栈跟踪:

java.lang.IllegalArgumentException: navigation destination com.domain.application:id/action_collection_fragment_to_view_fragment is unknown to this NavController
    at androidx.navigation.NavController.navigate(NavController.java:669)
    at androidx.navigation.NavController.navigate(NavController.java:628)
    at com.domain.application.CollectionFragment$onActivityCreated$4.onChanged(CollectionFragment.kt:126)
    at com.domain.application.CollectionFragment$onActivityCreated$4.onChanged(CollectionFragment.kt:28)
    at com.domain.application.common.SingleLiveEvent$observe$1.onChanged(SingleLiveEvent.kt:20)
    at android.arch.lifecycle.LiveData.considerNotify(LiveData.java:109)
    at android.arch.lifecycle.LiveData.dispatchingValue(LiveData.java:126)
    at android.arch.lifecycle.LiveData.setValue(LiveData.java:282)
    at android.arch.lifecycle.MutableLiveData.setValue(MutableLiveData.java:33)
    at com.domain.application.common.SingleLiveEvent.setValue(SingleLiveEvent.kt:27)
    at android.arch.lifecycle.LiveData$1.run(LiveData.java:87)
    at android.os.Handler.handleCallback(Handler.java:789)
    at android.os.Handler.dispatchMessage(Handler.java:98)
    at android.os.Looper.loop(Looper.java:164)
    at android.app.ActivityThread.main(ActivityThread.java:6938)
    at java.lang.reflect.Method.invoke(Native Method)
    at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:327)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1374)

推荐答案

这是alpha04版本中的错误，已在alpha05 https://issuetracker.google.com/issues/111907708

This was a bug in alpha04 version it's fixed in alpha05 https://issuetracker.google.com/issues/111907708

这篇关于导航组件popUpTo错误的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！