我正在使用Android的AAC导航组件，并且已按照我的登录信息实现了条件导航，如这篇文章所述：Navigation Architecture Component - Login screen
现在一切似乎都可以正常工作，但是在导航到登录屏幕并成功登录然后导航回到主屏幕之后，旋转时应用崩溃，并出现以下错误：
--------- beginning of crash
2019-02-02 13:08:28.423 6030-6030/uk.co.victoriajanedavis.chatapp E/AndroidRuntime: FATAL EXCEPTION: main
Process: uk.co.victoriajanedavis.chatapp, PID: 6030
java.lang.RuntimeException: Unable to start activity ComponentInfo{uk.co.victoriajanedavis.chatapp/uk.co.victoriajanedavis.chatapp.presentation.ui.main.MainActivity}: android.view.InflateException: Binary XML file line #10: Binary XML file line #10: Error inflating class fragment
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2778)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2856)
at android.app.ActivityThread.handleRelaunchActivity(ActivityThread.java:4699)
at android.app.ActivityThread.-wrap18(Unknown Source:0)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1595)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6494)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:438)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:807)
Caused by: android.view.InflateException: Binary XML file line #10: Binary XML file line #10: Error inflating class fragment
Caused by: android.view.InflateException: Binary XML file line #10: Error inflating class fragment
Caused by: java.lang.IllegalStateException: unknown destination during restore: uk.co.victoriajanedavis.chatapp:id/friendsFragment
at androidx.navigation.NavController.onGraphCreated(NavController.java:483)
at androidx.navigation.NavController.setGraph(NavController.java:459)
at androidx.navigation.NavController.setGraph(NavController.java:424)
at androidx.navigation.NavController.setGraph(NavController.java:406)
at androidx.navigation.fragment.NavHostFragment.onCreate(NavHostFragment.java:226)
at androidx.fragment.app.Fragment.performCreate(Fragment.java:2414)
at androidx.fragment.app.FragmentManagerImpl.moveToState(FragmentManagerImpl.java:844)
at androidx.fragment.app.FragmentManagerImpl.moveToState(FragmentManagerImpl.java:1129)
at androidx.fragment.app.FragmentManagerImpl.onCreateView(FragmentManagerImpl.java:3132)
at androidx.fragment.app.FragmentController.onCreateView(FragmentController.java:133)
at androidx.fragment.app.FragmentActivity.dispatchFragmentsOnCreateView(FragmentActivity.java:345)
at androidx.fragment.app.FragmentActivity.onCreateView(FragmentActivity.java:324)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:780)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:730)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:863)
at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:824)
at android.view.LayoutInflater.inflate(LayoutInflater.java:515)
at android.view.LayoutInflater.inflate(LayoutInflater.java:423)
at android.view.LayoutInflater.inflate(LayoutInflater.java:374)
at androidx.appcompat.app.AppCompatDelegateImpl.setContentView(AppCompatDelegateImpl.java:469)
at androidx.appcompat.app.AppCompatActivity.setContentView(AppCompatActivity.java:141)
at uk.co.victoriajanedavis.chatapp.presentation.ui.main.MainActivity.onCreate(MainActivity.kt:22)
at android.app.Activity.performCreate(Activity.java:7009)
at android.app.Activity.performCreate(Activity.java:7000)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1214)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2731)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2856)
at android.app.ActivityThread.handleRelaunchActivity(ActivityThread.java:4699)
at android.app.ActivityThread.-wrap18(Unknown Source:0)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1595)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6494)
at java.lang.reflect.Method.invoke(Native Method)
2019-02-02 13:08:28.423 6030-6030/uk.co.victoriajanedavis.chatapp E/AndroidRuntime: at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:438)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:807)
这是我的nav_graph.xml（负责登录流程的ID是@ + id / action_friendsFragment_to_loginFlowGraph，@ + id / action_loginFragment_to_chatFlowGraph，@ + id / action_signupFragmentFragment_to_chatFlowGraph）：
<?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/nav_graph"
app:startDestination="@id/chatFlowGraph">
<!-- Chat Flow (nested graph) -->
<navigation android:id="@+id/chatFlowGraph"
app:startDestination="@id/friendsFragment">
<fragment
android:id="@+id/friendsFragment"
android:name="uk.co.victoriajanedavis.chatapp.presentation.ui.friends.FriendRequestsToolbarFragment"
android:label="fragment_friends"
tools:layout="@layout/fragment_friend_requests_toolbar">
<action
android:id="@+id/action_friendsFragment_to_loginFlowGraph"
app:destination="@id/loginFlowGraph"
app:popUpTo="@id/chatFlowGraph"
app:popUpToInclusive="true"
app:enterAnim="@anim/slide_in_bottom"
app:exitAnim="@anim/fade_out"
app:popEnterAnim="@anim/fade_in"
app:popExitAnim="@anim/slide_out_bottom"/>
<action
android:id="@+id/action_friendsFragment_to_chatFragment"
app:destination="@id/chatFragment"/>
<action
android:id="@+id/action_friendsFragment_to_friendRequestsFragment"
app:destination="@id/friendRequestsFragment"
app:enterAnim="@anim/grow_in_top_right"
app:exitAnim="@anim/fade_out"
app:popEnterAnim="@anim/fade_in"
app:popExitAnim="@anim/grow_out_top_right"/>
</fragment>
<fragment
android:id="@+id/chatFragment"
android:name="uk.co.victoriajanedavis.chatapp.presentation.ui.chat.ChatFragment"
android:label="fragment_chat"
tools:layout="@layout/fragment_chat" />
</navigation>
<!-- Login/Register Flow (nested graph) -->
<navigation android:id="@+id/loginFlowGraph"
app:startDestination="@id/loginFragment">
<fragment
android:id="@+id/loginFragment"
android:name="uk.co.victoriajanedavis.chatapp.presentation.ui.login.LoginFragment"
android:label="fragment_login"
tools:layout="@layout/fragment_login">
<action
android:id="@+id/action_loginFragment_to_chatFlowGraph"
app:destination="@id/chatFlowGraph"
app:popUpTo="@id/loginFlowGraph"
app:popUpToInclusive="true"/>
<action
android:id="@+id/action_loginFragment_to_signupFragment"
app:destination="@id/signupFragment"
app:enterAnim="@anim/slide_in_right"
app:exitAnim="@anim/slide_out_left"
app:popEnterAnim="@anim/slide_in_left"
app:popExitAnim="@anim/slide_out_right"/>
</fragment>
<fragment
android:id="@+id/signupFragment"
android:name="uk.co.victoriajanedavis.chatapp.presentation.ui.signup.SignupFragment"
android:label="fragment_signup"
tools:layout="@layout/fragment_signup">
<action
android:id="@+id/action_signupFragment_to_chatFlowGraph"
app:destination="@id/chatFlowGraph"
app:popUpTo="@id/loginFlowGraph"
app:popUpToInclusive="true"/>
</fragment>
</navigation>
<!-- FriendRequestsFragment -->
<fragment
android:id="@+id/friendRequestsFragment"
android:name="uk.co.victoriajanedavis.chatapp.presentation.ui.friendrequests.FriendRequestsFragment"
android:label="fragment_friend_requests"
tools:layout="@layout/fragment_friend_requests">
<action
android:id="@+id/action_friendRequestsFragment_to_sendFriendRequestFragment"
app:destination="@id/sendFriendRequestFragment"
app:enterAnim="@anim/slide_in_bottom"
app:exitAnim="@anim/fade_out"
app:popEnterAnim="@anim/fade_in"
app:popExitAnim="@anim/slide_out_bottom"/>
</fragment>
<!-- SendFriendRequestFragment -->
<fragment
android:id="@+id/sendFriendRequestFragment"
android:name="uk.co.victoriajanedavis.chatapp.presentation.ui.friendrequests.sent.send.SendFriendRequestFragment"
android:label="fragment_send_friend_request"
tools:layout="@layout/fragment_send_friend_request" />
</navigation>
编辑：使用最新的导航组件版本1.0.0-alpha11
答案 0 :(得分：1)
此错误已在导航组件的1.0.0-beta01版本中修复。
答案 1 :(得分：0)
即使在1.0.0-beta01之后，看起来该错误仍然存在
从变更日志中，我们可以在2.1.0-alpha04中看到它已解决