如何修复“Error inflating class null”错误

Question

我正在尝试制作可滚动选项卡，但是当我在片段布局中设置视图时，应用程序开始出现错误，显示为“Error inflating class null”。当未添加视图时，它可以工作，但是当我将视图添加到布局中时，它就会给我错误。我按照此处所述添加了类，但它不起作用。该如何解决？以下是我的片段代码：

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.example.neelay.anotherbeatbox.Fragment.Songs"
android:background="@color/colorPrimaryDark"
class = "com.example.neelay.anotherbeatbox.Fragment.Songs">

<!-- TODO: Update blank fragment layout -->
<TextView
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:text="@string/hello_blank_fragment" />
<view
android:layout_width="match_parent"
android:layout_height="1dp"
android:background="#fff"
android:layout_marginTop="150dp"/>
</FrameLayout>

片段包名是package com.example.neelay.anotherbeatbox.Fragment; 片段名称为songs。我该如何修复此错误？

E/AndroidRuntime: FATAL EXCEPTION: main
              android.view.InflateException: Binary XML file line #14: Error inflating class null
                  at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:704)
                  at android.view.LayoutInflater.rInflate(LayoutInflater.java:746)
                  at android.view.LayoutInflater.inflate(LayoutInflater.java:489)
                  at android.view.LayoutInflater.inflate(LayoutInflater.java:396)
                  at com.example.neelay.anotherbeatbox.Fragment.Songs.onCreateView(Songs.java:27)
                  at android.support.v4.app.Fragment.performCreateView(Fragment.java:2074)
                  at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1104)
                  at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1286)
                  at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:758)
                  at android.support.v4.app.FragmentManagerImpl.execSingleAction(FragmentManager.java:1632)
                  at android.support.v4.app.BackStackRecord.commitNowAllowingStateLoss(BackStackRecord.java:637)
                  at android.support.v4.app.FragmentPagerAdapter.finishUpdate(FragmentPagerAdapter.java:143)
                  at com.antonyt.infiniteviewpager.InfinitePagerAdapter.finishUpdate(InfinitePagerAdapter.java:67)
                  at android.support.v4.view.ViewPager.populate(ViewPager.java:1237)
                  at android.support.v4.view.ViewPager.populate(ViewPager.java:1085)
                  at android.support.v4.view.ViewPager.onMeasure(ViewPager.java:1611)
                  at android.view.View.measure(View.java:15356)
                  at android.widget.RelativeLayout.measureChildHorizontal(RelativeLayout.java:622)
                  at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:404)
                  at android.view.View.measure(View.java:15356)
                  at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4928)
                  at android.support.design.widget.CoordinatorLayout.onMeasureChild(CoordinatorLayout.java:671)
                  at android.support.design.widget.CoordinatorLayout.onMeasure(CoordinatorLayout.java:738)
                  at android.view.View.measure(View.java:15356)
                  at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4928)
                  at android.widget.FrameLayout.onMeasure(FrameLayout.java:315)
                  at android.support.v7.widget.ContentFrameLayout.onMeasure(ContentFrameLayout.java:135)
                  at android.view.View.measure(View.java:15356)
                  at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4928)
                  at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1457)
                  at android.widget.LinearLayout.measureVertical(LinearLayout.java:723)
                  at android.widget.LinearLayout.onMeasure(LinearLayout.java:583)
                  at android.view.View.measure(View.java:15356)
                  at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4928)
                  at android.widget.FrameLayout.onMeasure(FrameLayout.java:315)
                  at android.view.View.measure(View.java:15356)
                  at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4928)
                  at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1457)
                  at android.widget.LinearLayout.measureVertical(LinearLayout.java:723)
                  at android.widget.LinearLayout.onMeasure(LinearLayout.java:583)
                  at android.view.View.measure(View.java:15356)
                  at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4928)
                  at android.widget.FrameLayout.onMeasure(FrameLayout.java:315)
                  at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2148)
                  at android.view.View.measure(View.java:15356)
                  at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:1858)
                  at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1110)
                  at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1283)
                  at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1008)
                  at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:4222)
                  at android.view.Choreographer$CallbackRecord.run(Choreographer.java:725)
                  at android.view.Choreographer.doCallbacks(Choreographer.java:555)
                  at android.view.Choreographer.doFrame(Choreographer.java:525)
                  at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:711)
                  at android.os.Handler.handleCallback(Handler.java:615)
                at android.os.Handler.dispatchMessage(Handler.java:92

D/dalvikvm: GC_CONCURRENT 释放了343K内存，剩余可用10%的空间，当前占用6423K/7111K，暂停12ms+16ms，总计53ms

我的Fragment类

package com.example.neelay.anotherbeatbox.Fragment;


import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

 import com.example.neelay.anotherbeatbox.R;


public class Songs extends Fragment {


public Songs() {
    // Required empty public constructor
}


@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    // Inflate the layout for this fragment
    return inflater.inflate(R.layout.fragment_songs, container, false);
}

}

- SAVVY

---

请分享您的堆栈跟踪。 - Gaurav Sarma

@gaurav4sarma 看一下问题，我现在已经添加了错误信息。 - SAVVY

我以前见过类似的错误，但是无法弄清楚原因。片段可以做一些奇怪的事情。 在你的情况下...嗯...我有点不清楚你想要实现什么。如果你想显示一个片段（NavigationDrawerFragment），难道不应该使用<fragment>标签而不是<FrameLayout>吗？这就是你链接的示例所做的。然后你可以给那个片段标签一个ID。 - Chad Schultz

@ChadSchultz 我在可滚动选项卡中使用了片段，现在请看问题，希望你能帮我。 - SAVVY

Answer 1

替换

<view

与，用

<View

View是一个实际的小部件，您可以进行充气，并似乎适合您的预期目的。 view是一个特殊的标签，您可以通过在属性中定义的名称膨胀视图类，并且您尚未定义此类名称（在充气器中出现为null）。

- laalto

---

非常有帮助。感谢您的帮助。 - Pooja

Answer 2

你需要为视图类定义正确的包名。通过查看类中定义的包名，你可以在布局xml中像这样定义它。

<com.example.neelay.anotherbeatbox.Fragment.Songs
    android:layout_width="match_parent"
    android:layout_height="1dp"
    android:background="#fff"
    android:layout_marginTop="150dp"/>

- Gaurav Sarma

---

它对ImageView也不起作用，而且我能在早期版本的Android Studio中做到这一点。 - SAVVY