android - 如何修复由目的地引起的膨胀错误不是此 NavGraph 的直接子级

Question

我有一个带有主要 Activity 的简单应用程序，一个 fragment frag_home ，以及一个名为 ItemFragment 的列表 fragment .
在 frag_home我有一个日历 View 。如果用户选择一个日期，操作 frag_homeDirections.actionFragHomeToItemFragment(mytimeinmillis)打开显示所选日期事件的列表 fragment 。该操作使用参数 timeinmillis ，它以毫秒为单位保存选定的日期。

一切正常。但是，如果我想创建一个两个面板 View 并将 listfragment 实现到主 fragment 的布局中(只需使用 xml 编辑器，选择 activity_main.xml，将 fragment 组件拖到 activity_main 并选择 listItem)我会收到以下错误，如果我尝试运行我的应用程序:

E/AndroidRuntime: FATAL EXCEPTION: main
    Process: com.example.myapplication, PID: 8401
    java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.myapplication/com.example.myapplication.MainActivity}: android.view.InflateException: Binary XML file line #29: Binary XML file line #29: Error inflating class fragment
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2756)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2817)
        at android.app.ActivityThread.-wrap12(ActivityThread.java)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1556)
        at android.os.Handler.dispatchMessage(Handler.java:102)
        at android.os.Looper.loop(Looper.java:163)
        at android.app.ActivityThread.main(ActivityThread.java:6388)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:930)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:820)
     Caused by: android.view.InflateException: Binary XML file line #29: Binary XML file line #29: Error inflating class fragment
     Caused by: android.view.InflateException: Binary XML file line #29: Error inflating class fragment
     Caused by: java.lang.IllegalArgumentException: navigation destination com.example.myapplication:id/destination_home is not a direct child of this NavGraph

这是我实现 fragment ItemFragment 的主要 Activity

?xml version="1.0" encoding="utf-8"?>
<androidx.drawerlayout.widget.DrawerLayout
        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/drawer_layout"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        tools:context=".MainActivity">
<LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical"
        tools:context=".MainActivity" >


    <androidx.appcompat.widget.Toolbar
            android:id="@+id/toolbar"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:background="?attr/colorPrimary"
            android:theme="?attr/actionBarTheme"

    />


    <com.google.android.material.bottomnavigation.BottomNavigationView
            android:id="@+id/bottom_nav"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            app:menu="@menu/menu_navigation"/>
    <fragment
            android:name="androidx.navigation.fragment.NavHostFragment"
            android:layout_width="423dp"
            android:layout_height="320dp" app:navGraph="@navigation/nav_graph" app:defaultNavHost="true"
            android:id="@+id/nav_host_fragment"/>
    <fragment
            android:layout_width="match_parent"
            android:layout_height="301dp" android:name="com.example.myapplication.ItemFragment"
            android:id="@+id/fragment"/>


</LinearLayout>
<com.google.android.material.navigation.NavigationView
android:id="@+id/nav_view"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_gravity="start"
app:menu="@menu/menu_navigation"/>
        </androidx.drawerlayout.widget.DrawerLayout >

这是我的导航图

?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/nav_graph"
            app:startDestination="@+id/frag_home">

    <fragment android:id="@+id/itemFragment" android:name="com.example.myapplication.ItemFragment"
              android:label="ItemFragment" tools:layout="@layout/fragment_item">
        <argument android:name="timeinmillis" app:argType="long" />
    </fragment>
    <fragment android:id="@+id/frag_home" android:name="com.example.myapplication.frag_home"
              android:label="fragment_main" tools:layout="@layout/frag_home">
        <action android:id="@+id/action_frag_home_to_itemFragment" app:destination="@id/itemFragment"/>
        <action android:id="@+id/action_frag_home_to_create_Event" app:destination="@id/create_Event"/>
    </fragment>
    <fragment android:id="@+id/create_Event" android:name="com.example.myapplication.Create_Event"
              android:label="fragment_create__event" tools:layout="@layout/fragment_create__event"/>
</navigation> 

我的主要 Activity

class MainActivity : AppCompatActivity() {
    private lateinit var linearLayoutManager: LinearLayoutManager
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
       //linearLayoutManager = LinearLayoutManager(this)
        //list2_recycler_view.layoutManager = linearLayoutManager
        setSupportActionBar(toolbar)
        val navController = Navigation.findNavController(this,R.id.nav_host_fragment)


        setupBottomNavMenu(navController)

        setupActionBar(navController)
    setupSideNavigationMenu(navController)
    }

我的家庭 fragment :

class frag_home : Fragment() {

    override fun onCreateView(
        inflater: LayoutInflater, container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View? {
        // Inflate the layout for this fragment
        return inflater.inflate(R.layout.frag_home, container, false)
    }

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

        btnCreateEvent.setOnClickListener{
           //val date = "heute"
            val action = frag_homeDirections.actionFragHomeToCreateEvent()
            val openHandler = My_Clients_OpenHandler()
            val selected_date = Calendar.getInstance().timeInMillis
           // action.setStrDatum("Bussi!")
          Navigation.findNavController(it).navigate(action)


        }
        btnListe.setOnClickListener{
            //val date = "heute"
            val caltmp = Calendar.getInstance()
            val mytimeinmillis = caltmp.timeInMillis
            val action = frag_homeDirections.actionFragHomeToItemFragment(mytimeinmillis)
            val openHandler = My_Clients_OpenHandler()
            // action.setStrDatum("Bussi!")

          Navigation.findNavController(it).navigate(action)


        }
        calendarView?.setOnDateChangeListener { view, year, month, dayOfMonth ->
            // Note that months are indexed from 0. So, 0 means January, 1 means february, 2 means march etc.

            val selected_date = "Selected date is " + dayOfMonth + "/" + (month + 1) + "/" + year
            val caltmp = Calendar.getInstance()
            //val newdatetime = DateTime(year,month, dayOfMonth)
            caltmp.set(year,month,dayOfMonth)
            val mytimeinmillis = caltmp.timeInMillis
            val sdf = SimpleDateFormat("dd.MM.yyyy HH:mm")
            val strSelectedDate = sdf.format(caltmp.getTime())
            val action = frag_homeDirections.actionFragHomeToItemFragment(mytimeinmillis)


              view.findNavController().navigate(action)
          //  actionCreateEvent.setStrDatum(msg)
          //  Navigation.findNavController(view).navigate(actionCreateEvent)
        }


    }

}

如果你需要 itemfragment 的重要部分

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)

        arguments?.let {
            columnCount = it.getInt(ARG_COLUMN_COUNT)
        }
    }

    override fun onCreateView(
        inflater: LayoutInflater, container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View? {
        val view = inflater.inflate(
            R.layout.fragment_recyclerview,
            container,
            false
        )
        //val timeinmillis = arguments?.let { ItemFragmentArgs.fromBundle(it).timeinmillis }
        // val selecteddate = ItemFragmentArgs.fromBundle(arguments)
        //getActivity()?.setTitle(selecteddate);
        // Set the adapter
      var linearLayoutManager: LinearLayoutManager


        openCalendar = OpenCalendarHandler(activity)
        val caltemp = Calendar.getInstance();
        val longTimeinMillis = arguments?.let { ItemFragmentArgs.fromBundle(it).timeinmillis }

        caltemp.timeInMillis = longTimeinMillis!!


        val heute = caltemp.timeInMillis

        val intCalendarId = openCalendar.getCalendarIdbyCalendarName(view.context, "Klienten_Rolandcloud")
        val strCalendarId = intCalendarId!!.toString()
        // alle events vom aktuell im Kalendar_Monat ausgew�hlten Tag
        val selection = ("((" + CalendarContract.Events.DTSTART + " >= ?) AND ("
                + CalendarContract.Events.DTEND + " <= ?) AND ("
                + CalendarContract.Events.DELETED + " = ?) AND ("
                + CalendarContract.Events.CALENDAR_ID + " = ?))")

        val t = Time()
        t.set(caltemp.getTimeInMillis())

        // Ende des Tages indem ich die Uhrzeit auf 23:59 und 59 Sekunden
        // stelle..
        t.set(59, 59, 23, t.monthDay, t.month, t.year)
        val dtEnd = java.lang.Long.toString(t.toMillis(false))
        val strEnde = openCalendar.getStringTimeinMillis(
            t.toMillis(false),
            "yyyy-MM-dd HH:mm"
        )

        // Start des Tages bei 00:00
        t.set(0, 0, 0, t.monthDay, t.month, t.year)
        val strStart = openCalendar.getStringTimeinMillis(
            t.toMillis(false),
            "yyyy-MM-dd HH:mm"
        )
        val dtStart = java.lang.Long.toString(t.toMillis(false))


        val selectionArgs = arrayOf(dtStart, dtEnd, "0", intCalendarId.toString())

        //my_recyclerview  // Add this
        val activity = activity as Context
        val my_recycler_view = view.findViewById<RecyclerView>(R.id.my_recycler_view)
        val meinCursor = openCalendar.getEvents(view.context,selection,selectionArgs,null)
       //linearLayoutManager = LinearLayoutManager(activity)

        view.my_recycler_view.layoutManager = LinearLayoutManager(activity)
        // set the custom adapter to the RecyclerView
        view.my_recycler_view.adapter = MyCalendarAdapter_kotlin(view.context,meinCursor)



        return view
    }

    override fun onActivityCreated(savedInstanceState: Bundle?) {
        super.onActivityCreated(savedInstanceState)
        LoaderManager.getInstance(this).initLoader(EVENTLOADER_ID, null, this)
    }
    // populate the views now that the layout has been inflated
    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
        super.onViewCreated(view, savedInstanceState)
        // RecyclerView node initialized here
        my_recycler_view.apply {
            // set a LinearLayoutManager to handle Android
            // RecyclerView behavior
            val caltmp = Calendar.getInstance()

        }
    }

/*

那么，如果我想将 listfragment 实现到 activity_main fragment 中，我该如何解决这个错误。我的目标:查看带有日历 View 的 fragment frag_home 以及带有当天事件的列表 fragment 。全部通过使用导航组件和操作。

还是无法使用导航组件导航到一个fragment，而这个fragment是在其他布局中实现的？
谢谢!!

Answer 1

确保指定起始 fragment 。由于某种原因，我没有起始 fragment ，并且一旦修复，就纠正了“不是直接子错误”。

确保在 fragment 上指定了 Start