片段对话框中的片段膨胀引发错误“片段未创建视图”
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【中文标题】片段对话框中的片段膨胀引发错误“片段未创建视图”【英文标题】:Fragment inflated in Fragment Dialog throws error "Fragment did not create a view" 【发布时间】:2016-01-08 19:23:46 【问题描述】:用户单击一个按钮会弹出一个片段对话框,该对话框会像这样膨胀片段:
AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
View view = getActivity().getLayoutInflater().inflate(
R.layout.monday_fragment, null);
builder.setView(view).setTitle("Homework Due Monday")
.setNegativeButton("Dismiss", null);
AlertDialog dialog = builder.create();
dialog.show();
这是指定布局的 xml (monday_fragment.xml),其中对要膨胀的片段的引用位于:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/container"
android:layout_
android:layout_
tools:context=".MainActivity"
>
<fragment
android:id="@+id/monday_fragment"
android:layout_
android:layout_
android:name="com.bernard.beaconportal.activities.schedule.daydialogfragments.MondayFragment"
android:layout_centerHorizontal="true"/>
</RelativeLayout>
片段对话框中的片段然后在其 OnCreateView 中膨胀自己的布局:
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState)
swipe = inflater.inflate(R.layout.day_homework_fragment, container,
false);
lView = (ListView) swipe.findViewById(R.id.listView1);
progress = (ProgressBar) swipe.findViewById(R.id.progress);
lView.setVisibility(View.GONE);
return swipe;
这是片段中膨胀的“day_homework_fragment.xml”布局:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_
android:layout_
android:orientation="vertical"
android:layout_gravity="center"
android:background="@color/light_background">
<ProgressBar
android:id="@+id/progress"
android:layout_
android:layout_
android:layout_gravity="center" />
<ListView
android:id="@+id/listView1"
android:layout_
android:layout_
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true"
android:layout_alignParentTop="true"
android:background="#ffffff"
android:divider="@null"
android:dividerHeight="0dp"
>
</ListView>
<TextView
android:id="@+id/emptyView"
android:layout_
android:layout_
android:text="As of now, no homework due this day"
android:padding="30dp"
android:textSize="16sp"/>
</LinearLayout>
这是它引发的错误日志,我已经尝试过 post 和 post 都没有解决问题。
10-11 01:50:40.657 786-786/com.bernard.beaconportal.activities E/AndroidRuntime: FATAL EXCEPTION: main
10-11 01:50:40.657 786-786/com.bernard.beaconportal.activities E/AndroidRuntime: Process: com.bernard.beaconportal.activities, PID: 786
10-11 01:50:40.657 786-786/com.bernard.beaconportal.activities E/AndroidRuntime: android.view.InflateException: Binary XML file line #10: Error inflating class fragment
10-11 01:50:40.657 786-786/com.bernard.beaconportal.activities E/AndroidRuntime: at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:763)
10-11 01:50:40.657 786-786/com.bernard.beaconportal.activities E/AndroidRuntime: at android.view.LayoutInflater.rInflate(LayoutInflater.java:806)
10-11 01:50:40.657 786-786/com.bernard.beaconportal.activities E/AndroidRuntime: at android.view.LayoutInflater.inflate(LayoutInflater.java:504)
10-11 01:50:40.657 786-786/com.bernard.beaconportal.activities E/AndroidRuntime: at de.robv.android.xposed.XposedBridge.invokeOriginalMethodNative(Native Method)
10-11 01:50:40.657 786-786/com.bernard.beaconportal.activities E/AndroidRuntime: at de.robv.android.xposed.XposedBridge.handleHookedMethod(XposedBridge.java:668)
10-11 01:50:40.657 786-786/com.bernard.beaconportal.activities E/AndroidRuntime: at android.view.LayoutInflater.inflate(<Xposed>)
10-11 01:50:40.657 786-786/com.bernard.beaconportal.activities E/AndroidRuntime: at android.view.LayoutInflater.inflate(LayoutInflater.java:414)
10-11 01:50:40.657 786-786/com.bernard.beaconportal.activities E/AndroidRuntime: at android.view.LayoutInflater.inflate(LayoutInflater.java:365)
10-11 01:50:40.657 786-786/com.bernard.beaconportal.activities E/AndroidRuntime: at com.bernard.beaconportal.activities.schedule.view.MondayView.showDialog(MondayView.java:232)
10-11 01:50:40.657 786-786/com.bernard.beaconportal.activities E/AndroidRuntime: at com.bernard.beaconportal.activities.schedule.view.MondayView$1.onClick(MondayView.java:174)
10-11 01:50:40.657 786-786/com.bernard.beaconportal.activities E/AndroidRuntime: at android.view.View.performClick(View.java:4780)
10-11 01:50:40.657 786-786/com.bernard.beaconportal.activities E/AndroidRuntime: at android.view.View$PerformClick.run(View.java:19867)
10-11 01:50:40.657 786-786/com.bernard.beaconportal.activities E/AndroidRuntime: at android.os.Handler.handleCallback(Handler.java:739)
10-11 01:50:40.657 786-786/com.bernard.beaconportal.activities E/AndroidRuntime: at android.os.Handler.dispatchMessage(Handler.java:95)
10-11 01:50:40.657 786-786/com.bernard.beaconportal.activities E/AndroidRuntime: at android.os.Looper.loop(Looper.java:135)
10-11 01:50:40.657 786-786/com.bernard.beaconportal.activities E/AndroidRuntime: at android.app.ActivityThread.main(ActivityThread.java:5338)
10-11 01:50:40.657 786-786/com.bernard.beaconportal.activities E/AndroidRuntime: at java.lang.reflect.Method.invoke(Native Method)
10-11 01:50:40.657 786-786/com.bernard.beaconportal.activities E/AndroidRuntime: at java.lang.reflect.Method.invoke(Method.java:372)
10-11 01:50:40.657 786-786/com.bernard.beaconportal.activities E/AndroidRuntime: at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:917)
10-11 01:50:40.657 786-786/com.bernard.beaconportal.activities E/AndroidRuntime: at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:704)
10-11 01:50:40.657 786-786/com.bernard.beaconportal.activities E/AndroidRuntime: at de.robv.android.xposed.XposedBridge.main(XposedBridge.java:115)
10-11 01:50:40.657 786-786/com.bernard.beaconportal.activities E/AndroidRuntime: Caused by: java.lang.IllegalStateException: Fragment com.bernard.beaconportal.activities.schedule.daydialogfragments.MondayFragment did not create a view.
10-11 01:50:40.657 786-786/com.bernard.beaconportal.activities E/AndroidRuntime: at android.support.v4.app.FragmentManagerImpl.onCreateView(FragmentManager.java:2273)
10-11 01:50:40.657 786-786/com.bernard.beaconportal.activities E/AndroidRuntime: at android.support.v4.app.FragmentController.onCreateView(FragmentController.java:111)
10-11 01:50:40.657 786-786/com.bernard.beaconportal.activities E/AndroidRuntime: at android.support.v4.app.FragmentActivity.dispatchFragmentsOnCreateView(FragmentActivity.java:278)
10-11 01:50:40.657 786-786/com.bernard.beaconportal.activities E/AndroidRuntime: at android.support.v4.app.BaseFragmentActivityDonut.onCreateView(BaseFragmentActivityDonut.java:44)
10-11 01:50:40.657 786-786/com.bernard.beaconportal.activities E/AndroidRuntime: at android.support.v4.app.FragmentActivity.onCreateView(FragmentActivity.java:78)
10-11 01:50:40.657 786-786/com.bernard.beaconportal.activities E/AndroidRuntime: at android.support.v7.app.AppCompatDelegateImplV7.callActivityOnCreateView(AppCompatDelegateImplV7.java:842)
10-11 01:50:40.657 786-786/com.bernard.beaconportal.activities E/AndroidRuntime: at android.support.v7.app.AppCompatDelegateImplV11.callActivityOnCreateView(AppCompatDelegateImplV11.java:34)
10-11 01:50:40.657 786-786/com.bernard.beaconportal.activities E/AndroidRuntime: at android.support.v7.app.AppCompatDelegateImplV7.onCreateView(AppCompatDelegateImplV7.java:830)
10-11 01:50:40.657 786-786/com.bernard.beaconportal.activities E/AndroidRuntime: at android.support.v4.view.LayoutInflaterCompatHC$FactoryWrapperHC.onCreateView(LayoutInflaterCompatHC.java:44)
10-11 01:50:40.657 786-786/com.bernard.beaconportal.activities E/AndroidRuntime: at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:725)
10-11 01:50:40.657 786-786/com.bernard.beaconportal.activities E/AndroidRuntime: at android.view.LayoutInflater.rInflate(LayoutInflater.java:806)
10-11 01:50:40.657 786-786/com.bernard.beaconportal.activities E/AndroidRuntime: at android.view.LayoutInflater.inflate(LayoutInflater.java:504)
10-11 01:50:40.657 786-786/com.bernard.beaconportal.activities E/AndroidRuntime: at de.robv.android.xposed.XposedBridge.invokeOriginalMethodNative(Native Method)
10-11 01:50:40.657 786-786/com.bernard.beaconportal.activities E/AndroidRuntime: at de.robv.android.xposed.XposedBridge.handleHookedMethod(XposedBridge.java:668)
10-11 01:50:40.657 786-786/com.bernard.beaconportal.activities E/AndroidRuntime: at android.view.LayoutInflater.inflate(<Xposed>)
10-11 01:50:40.657 786-786/com.bernard.beaconportal.activities E/AndroidRuntime: at android.view.LayoutInflater.inflate(LayoutInflater.java:414)
10-11 01:50:40.657 786-786/com.bernard.beaconportal.activities E/AndroidRuntime: at android.view.LayoutInflater.inflate(LayoutInflater.java:365)
10-11 01:50:40.657 786-786/com.bernard.beaconportal.activities E/AndroidRuntime: at com.bernard.beaconportal.activities.schedule.view.MondayView.showDialog(MondayView.java:232)
10-11 01:50:40.657 786-786/com.bernard.beaconportal.activities E/AndroidRuntime: at com.bernard.beaconportal.activities.schedule.view.MondayView$1.onClick(MondayView.java:174)
10-11 01:50:40.657 786-786/com.bernard.beaconportal.activities E/AndroidRuntime: at android.view.View.performClick(View.java:4780)
10-11 01:50:40.657 786-786/com.bernard.beaconportal.activities E/AndroidRuntime: at android.view.View$PerformClick.run(View.java:19867)
10-11 01:50:40.657 786-786/com.bernard.beaconportal.activities E/AndroidRuntime: at android.os.Handler.handleCallback(Handler.java:739)
10-11 01:50:40.657 786-786/com.bernard.beaconportal.activities E/AndroidRuntime: at android.os.Handler.dispatchMessage(Handler.java:95)
10-11 01:50:40.657 786-786/com.bernard.beaconportal.activities E/AndroidRuntime: at android.os.Looper.loop(Looper.java:135)
10-11 01:50:40.657 786-786/com.bernard.beaconportal.activities E/AndroidRuntime: at android.app.ActivityThread.main(ActivityThread.java:5338)
10-11 01:50:40.657 786-786/com.bernard.beaconportal.activities E/AndroidRuntime: at java.lang.reflect.Method.invoke(Native Method)
10-11 01:50:40.657 786-786/com.bernard.beaconportal.activities E/AndroidRuntime: at java.lang.reflect.Method.invoke(Method.java:372)
10-11 01:50:40.657 786-786/com.bernard.beaconportal.activities E/AndroidRuntime: at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:917)
10-11 01:50:40.657 786-786/com.bernard.beaconportal.activities E/AndroidRuntime: at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:704)
10-11 01:50:40.657 786-786/com.bernard.beaconportal.activities E/AndroidRuntime: at de.robv.android.xposed.XposedBridge.main(XposedBridge.java:115)
编辑:我刚刚意识到这只是在我从 Eclipse 迁移到 Android Studio 之后才开始发生的。也许这与它有关?可能所有的片段引用都搞砸了?
【问题讨论】:
您是否为您的片段致电onCreateView
或onCreate
?
将标记显示到您的day_homework_fragment.xml
片段
@Tauqir 我确实为我的片段调用了 oncreateview,它膨胀了“day_homework_fragment”
@selbie 添加了“day_homework_fragment.xml”的标记
从您调用 AlertDialog 的位置
【参考方案1】:
您不能将片段放在标准 AlertDialog
中。您必须创建一个DialogFragment
实现来将片段添加到您的对话框中。原因很简单,因为标准片段会尝试将自己附加到相应活动的根窗口,而AlertDialog
在根窗口上有一个单独的窗口时情况并非如此。 AlertDialog
不能包含 DialogFragment
甚至是 Fragment
。尝试将您的 AlertDialog
代码更改为 DialogFragment
实现。
【讨论】:
我认为你有一个观点,因此我赞成你的回答。在我看来,您的建议可能是最好的。但是作者开发人员可能不想更改太多代码。在这种情况下,这可能是一个错误。【参考方案2】:您的日志指向第 10 行这一事实意味着此处的 xml 声明是一个问题,正如片段在第 10 行所说的那样:
android:name="com.bernard.beaconportal.activities.schedule.daydialogfragments.MondayFragment"
我会在这里仔细检查这个引用,看看它是否指向您为 Fragment 保存 java 类的正确位置。
另外,检查您的 MondayFragment 类,您正在扩展正确的 Fragment 类。也就是说,如果你使用的是支持库,你需要扩展支持库的 Fragment 类,而不是普通的 Fragment 类。
如果一切都失败了,您可以随时以编程方式添加片段:http://developer.android.com/training/basics/fragments/fragment-ui.html
编辑:我看到您目前正在使用以下代码膨胀您的 xml:
View view = getActivity().getLayoutInflater().inflate(
R.layout.monday_fragment, null);
既然你是在一个片段中膨胀它,你能不能只说:
View view = inflater.inflate(R.layout.monday_fragment, null,
false);
【讨论】:
我很确定我有正确的包名,因为即使 IDE 也能识别出我指向的是正确的片段。我也在为我的 Fragment 类使用支持库。 在 Android Studio 上尝试“File | Invalidate Caches/Restart”。【参考方案3】:我认为这段代码是可疑的:
View view = getActivity().getLayoutInflater().inflate(
R.layout.monday_fragment, null);
inflate
的第一个参数应该是xml文件名而不是片段ID。也许您想要 xml R.layout.day_homework_fragment。
我知道这些 ID 令人困惑。只有 findViewById
() 之类的方法指向 UI ID。
【讨论】:
哦,对不起,我应该在我的帖子中更清楚。 “monday_fragment.xml”也是包含片段引用的布局的名称。我会在我的帖子中更清楚地说明这一点。 澄清 monday_fragment 不是指片段 ID,而是指 xml 布局【参考方案4】:做以下两件事:
检查com.bernard.beaconportal.activities.schedule.daydialogfragments.MondayFragment
是否是正确的包名(路径)
在您的monday_fragment.xml
中将android:id="@+id/monday_fragment"
重命名为android:id="@+id/monday_fragment1"
。
见以下代码:
<Fragment
android:id="@+id/monday_fragment1"
android:layout_
android:layout_
android:name="com.bernard.beaconportal.activities.schedule.daydialogfragments.MondayFragment"
android:layout_centerHorizontal="true"/>
【讨论】:
我很确定我的包名是正确的,因为即使 IDE 也能识别出我指向的是正确的片段。此外,我刚刚尝试了#2,似乎 ID 与任何内容都没有冲突,因为我遇到了同样的错误。这是一个奇怪的错误,我不知道还能尝试什么。 如果您使用的是Android Studio,则删除[app模块]/build/下的所有子文件夹并重新编译项目 删除构建文件夹并重新编译后仍然没有变化。现在我想这只是在我从 eclipse 迁移到 Android Studio 之后才开始发生的,也许这与它有关。【参考方案5】:我相信你必须自己调试包com.bernard.beaconportal.activities.schedule.daydialogfragments.MondayFragment
。迁移到 Android Studio 后,UI 引用可能不再有效。一种简单的调试方法是删除OnCreateView()
中的代码。
如果您将包作为 jar 文件导入,则情况不同/问题。
【讨论】:
@I'm_With_Stupid,所以...如果您删除 OnCreateView 中的代码,应用还会崩溃吗?【参考方案6】:你为什么不使用对话框片段而不是 Alertdialog?它对于在活动范围内调用片段很重要。对话框片段将具有所有生命周期方法,这将有助于创建任何后续片段。
【讨论】:
【参考方案7】:通过 xml 绑定片段通常会带来负面的微妙后果。动态执行此操作。
改变你的 monday_fragment.xml 像:
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/container"
android:layout_
android:layout_
>
</FrameLayout>
并更改这段代码:
AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
View view = getActivity().getLayoutInflater().inflate(
R.layout.monday_fragment, null);
builder.setView(view).setTitle("Homework Due Monday")
.setNegativeButton("Dismiss", null);
MondayFragment mondayFragment = new MondayFragment();
getFragmentManager().beginTransaction()
.replace(R.id.container, mondayFragment)
.commit();
AlertDialog dialog = builder.create();
dialog.show();
编辑:如果失败尝试更改
getFragmentManager().beginTransaction()
.replace(R.id.container, mondayFragment)
.commit();
为
getParentFragment().getChildFragmentManager().beginTransaction()
.replace(R.id.container, mondayFragment)
.commit();
编辑让我们试试DialogFragment
请创建类 DayHomeworkDialogFragment:
public class DayHomeworkDialogFragment extends DialogFragment
public DayHomeworkDialogFragment()
@Override
public Dialog onCreateDialog(Bundle savedInstanceState)
LayoutInflater inflater = LayoutInflater.from(getActivity());
View swipe = inflater.inflate(R.layout.day_homework_fragment, null);
lView = (ListView) swipe.findViewById(R.id.listView1);
progress = (ProgressBar) swipe.findViewById(R.id.progress);
lView.setVisibility(View.GONE);
AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(getActivity())
.setView(swipe)
.setTitle("Homework Due Monday")
.setPositiveButton("Add", new DialogInterface.OnClickListener()
@Override
public void onClick(DialogInterface dialog, int which)
)
.setNegativeButton("Dismiss",
new DialogInterface.OnClickListener()
public void onClick(DialogInterface dialog, int whichButton)
dialog.dismiss();
);
return alertDialogBuilder.create();
而不是这个
AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
View view = getActivity().getLayoutInflater().inflate(
R.layout.monday_fragment, null);
builder.setView(view).setTitle("Homework Due Monday")
.setNegativeButton("Dismiss", null);
AlertDialog dialog = builder.create();
dialog.show();
使用这个:
FragmentManager fragmentManager = getFragmentManager();
DayHomeworkDialogFragment dayHomeworkDialogFragment = new DayHomeworkDialogFragment();
dayHomeworkDialogFragment.show(fragmentManager, "my_day_homework_fragment");
如果失败,请尝试使用 getChildFragmentManager() 而不是 getFragmentManager()
【讨论】:
无论我尝试什么,我都会得到这个error。它声称 R.id.container 不存在。我什至尝试在使用 framelayout.getId() 引用它之前启动 FrameLayout。似乎没有任何效果。 甚至 getChildFragmentManager() 都没有帮助? 所以我最终做的是使“com.bernard.beaconportal.activities.schedule.daydialogfragments.MondayFragment”成为 DialogFragment 而不是 Fragment。我只是希望我们能通过最初的错误弄清楚为什么会这样。 @I'm_With_Stupid 我对最初的错误有一些想法,但我需要一些时间来阅读源代码并测试一些假设。当我完成后,我会告诉你问题的原因以上是关于片段对话框中的片段膨胀引发错误“片段未创建视图”的主要内容,如果未能解决你的问题,请参考以下文章