如何修复由目的地引起的膨胀错误不是此 NavGraph 的直接子级
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【中文标题】如何修复由目的地引起的膨胀错误不是此 NavGraph 的直接子级【英文标题】：How to fix inflating error caused by destination is not a direct child of this NavGraph 【发布时间】：2019-10-18 17:51:05 【问题描述】：我有一个简单的应用程序，其中包含一个主要活动、一个片段 frag_home 和一个名为 ItemFragment 的列表片段。
在frag_home 我有一个日历视图。如果用户选择一个日期，frag_homeDirections.actionFragHomeToItemFragment(mytimeinmillis) 操作会打开显示所选日期事件的列表片段。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视图并将 listfragment 实现到主片段的布局中（只需使用 xml 编辑器，选择 activity_main.xml，将片段组件拖到 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 ComponentInfocom.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
这是我实现片段 ItemFragment 的主要活动
?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_
android:layout_
tools:context=".MainActivity">
<LinearLayout
android:layout_
android:layout_
android:orientation="vertical"
tools:context=".MainActivity" >
<androidx.appcompat.widget.Toolbar
android:id="@+id/toolbar"
android:layout_
android:layout_
android:background="?attr/colorPrimary"
android:theme="?attr/actionBarTheme"
/>
<com.google.android.material.bottomnavigation.BottomNavigationView
android:id="@+id/bottom_nav"
android:layout_
android:layout_
app:menu="@menu/menu_navigation"/>
<fragment
android:name="androidx.navigation.fragment.NavHostFragment"
android:layout_
android:layout_ app:navGraph="@navigation/nav_graph" app:defaultNavHost="true"
android:id="@+id/nav_host_fragment"/>
<fragment
android:layout_
android:layout_ android:name="com.example.myapplication.ItemFragment"
android:id="@+id/fragment"/>
</LinearLayout>
<com.google.android.material.navigation.NavigationView
android:id="@+id/nav_view"
android:layout_
android:layout_
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>
我的主要活动
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)
我的家庭片段：
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()
/*
如果我想将 listfragment 实现到 activity_main 片段中，我该如何解决这个错误。我的目标：查看带有日历视图的片段 frag_home 以及带有当天事件的列表片段。全部通过使用导航组件和操作。
或者说不能用导航组件导航到一个fragment，在其他布局中实现？ 谢谢！！
【问题讨论】：
你在哪里使用destination_home？
碎片——家应该是目的地——家。它是起始的家庭片段。我删除了第一个导航图，因为所有安全的 args 类突然消失了。在那个导航图中，我将标签命名为 frag-home destination-home（在导航编辑器中）
您是否尝试过从 app:startDestination="@+id/ 中删除“+”？
【参考方案1】：
确保您指定了起始片段。由于某种原因，我没有起始片段，一旦修复，就纠正了“不是直接子错误”。
确保在片段上指定了 Start
【讨论】：
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