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!!
最佳答案
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
关于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，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/56422874/