android - 为什么在导航 Controller 中实现包含时出现 StackOverflowError？

Question

我的项目文件:https://drive.google.com/file/d/11llz7ylWe7ACyLMBbqp6YzugUL8hhImt/view?usp=sharing

所以我有 2 个导航图。称为主导航图和身份验证图。

我将主图包含在 auth graph 中，反之亦然，auth graph 在主图中。

我想实现登录系统，所以当用户成功登录时，用户将进入主要 Activity (具有底部导航 View 和工具栏)，身份验证 Activity 没有底部导航 View 或 fragment 。这是图表

主导航图:

<?xml version="1.0" encoding="utf-8"?>
<navigation xmlns:android="http://schemas.android.com/apk/res/android"
            xmlns:app="http://schemas.android.com/apk/res-auto"
            xmlns:tools="http://schemas.android.com/tools"
            android:id="@+id/navigation_graph"
            app:startDestination="@id/destination_home">

    <include app:graph="@navigation/auth_graph" />

    <fragment android:id="@+id/destination_home" android:name="com.muchammadagunglaksana.navcontroller.HomeFragment"
              android:label="Home Judul" tools:layout="@layout/fragment_home">
        <action android:id="@+id/action_toAuthActivity" app:destination="@id/auth_graph"/>
    </fragment>


    <fragment android:id="@+id/destination_camera" android:name="com.muchammadagunglaksana.navcontroller.CameraFragment"
              android:label="Camera Judul" tools:layout="@layout/fragment_camera">
        <action android:id="@+id/toPhotosDestination" app:destination="@id/destination_photos"/>
    </fragment>


    <fragment android:id="@+id/destination_photos" android:name="com.muchammadagunglaksana.navcontroller.PhotosFragment"
              android:label="Foto Judul" tools:layout="@layout/fragment_photos">
        <action android:id="@+id/toHomeDestination" app:destination="@id/destination_home"/>
        <argument android:name="numberOfPhotos" app:argType="integer" android:defaultValue="0"/>
    </fragment>


    <fragment android:id="@+id/destination_settings"
              android:name="com.muchammadagunglaksana.navcontroller.SettingsFragment"
              android:label="Setting Judul" tools:layout="@layout/fragment_settings"/>
</navigation>

授权图:

<include app:graph="@navigation/navigation_graph" />

<fragment android:id="@+id/loginFragment" android:name="com.muchammadagunglaksana.navcontroller.LoginFragment"
          android:label="fragment_login" tools:layout="@layout/fragment_login">
    <action android:id="@+id/action_toMainActivity" app:destination="@id/navigation_graph"/>
</fragment>

在 LoginFragment 中单击登录按钮时，我使用以下代码:

       login_button.setOnClickListener {
            Navigation.findNavController(it).navigate(R.id.action_toMainActivity)
        }

并且在 HomeFragment 中，当单击注销按钮时，我使用:

logout_button.setOnClickListener {
            Navigation.findNavController(it).navigate(R.id.action_toAuthActivity)
        }

但我得到了stackoverflow错误:

E/AndroidRuntime: FATAL EXCEPTION: main Process: com.muchammadagunglaksana.navcontroller, PID: 14322 java.lang.StackOverflowError: stack size 8MB at android.support.v4.util.SparseArrayCompat.(SparseArrayCompat.java:77) at android.support.v4.util.SparseArrayCompat.(SparseArrayCompat.java:62) at androidx.navigation.NavGraph.(NavGraph.java:44) at androidx.navigation.NavGraphNavigator.createDestination(NavGraphNavigator.java:54) at androidx.navigation.NavGraphNavigator.createDestination(NavGraphNavigator.java:29) at androidx.navigation.NavInflater.inflate(NavInflater.java:100) at androidx.navigation.NavInflater.inflate(NavInflater.java:80) at androidx.navigation.NavInflater.inflate(NavInflater.java:128) at androidx.navigation.NavInflater.inflate(NavInflater.java:80) at androidx.navigation.NavInflater.inflate(NavInflater.java:128) at androidx.navigation.NavInflater.inflate(NavInflater.java:80) at androidx.navigation.NavInflater.inflate(NavInflater.java:128) at androidx.navigation.NavInflater.inflate(NavInflater.java:80) at androidx.navigation.NavInflater.inflate(NavInflater.java:128) at androidx.navigation.NavInflater.inflate(NavInflater.java:80) at androidx.navigation.NavInflater.inflate(NavInflater.java:128)

na.navcontroller E/JavaBinder: !!! FAILED BINDER TRANSACTION !!!

什么地方出了错 ？

Answer 1

一个 <include>标签完全等同于复制/粘贴包含图的确切内容来代替 <include> .通过拥有您的auth_graph包括 navigation_graph ，你已经建立了一个循环:navigation_graph包含 auth_graph其中包含 navigation_graph永远持续下去。

您需要做的是删除 <include app:graph="@navigation/navigation_graph" />来自您的auth_graph .因为您的auth_graph已经在 navigation_graph 内，您无需再次添加它，但您可以直接引用任何这些目的地。