Java 膨胀类android.support.v7.widget.CardView时出错
我在尝试运行应用程序时意外遇到以下错误:Java 膨胀类android.support.v7.widget.CardView时出错,java,android,android-layout,android-activity,Java,Android,Android Layout,Android Activity,我在尝试运行应用程序时意外遇到以下错误: Binary XML file line #8: Error inflating class android.support.v7.widget.CardView 以下是日志目录: 11-09 13:11:58.558: E/AndroidRuntime(12542): FATAL EXCEPTION: main 11-09 13:11:58.558: E/AndroidRuntime(12542): android.view.InflateE
Binary XML file line #8: Error inflating class android.support.v7.widget.CardView
以下是日志目录:
11-09 13:11:58.558: E/AndroidRuntime(12542): FATAL EXCEPTION: main
11-09 13:11:58.558: E/AndroidRuntime(12542): android.view.InflateException: Binary XML file line #8: Error inflating class android.support.v7.widget.CardView
11-09 13:11:58.558: E/AndroidRuntime(12542): at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:698)
11-09 13:11:58.558: E/AndroidRuntime(12542): at android.view.LayoutInflater.rInflate(LayoutInflater.java:746)
11-09 13:11:58.558: E/AndroidRuntime(12542): at android.view.LayoutInflater.inflate(LayoutInflater.java:489)
11-09 13:11:58.558: E/AndroidRuntime(12542): at android.view.LayoutInflater.inflate(LayoutInflater.java:396)
11-09 13:11:58.558: E/AndroidRuntime(12542): at com.dooba.beta.ThirdFragment.onCreateView(ThirdFragment.java:15)
11-09 13:11:58.558: E/AndroidRuntime(12542): at android.support.v4.app.Fragment.performCreateView(Fragment.java:1786)
11-09 13:11:58.558: E/AndroidRuntime(12542): at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:947)
11-09 13:11:58.558: E/AndroidRuntime(12542): at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1126)
11-09 13:11:58.558: E/AndroidRuntime(12542): at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:739)
11-09 13:11:58.558: E/AndroidRuntime(12542): at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1489)
11-09 13:11:58.558: E/AndroidRuntime(12542): at android.support.v4.app.FragmentManagerImpl$1.run(FragmentManager.java:454)
11-09 13:11:58.558: E/AndroidRuntime(12542): at android.os.Handler.handleCallback(Handler.java:615)
11-09 13:11:58.558: E/AndroidRuntime(12542): at android.os.Handler.dispatchMessage(Handler.java:92)
11-09 13:11:58.558: E/AndroidRuntime(12542): at android.os.Looper.loop(Looper.java:137)
11-09 13:11:58.558: E/AndroidRuntime(12542): at android.app.ActivityThread.main(ActivityThread.java:4745)
11-09 13:11:58.558: E/AndroidRuntime(12542): at java.lang.reflect.Method.invokeNative(Native Method)
11-09 13:11:58.558: E/AndroidRuntime(12542): at java.lang.reflect.Method.invoke(Method.java:511)
11-09 13:11:58.558: E/AndroidRuntime(12542): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
11-09 13:11:58.558: E/AndroidRuntime(12542): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
11-09 13:11:58.558: E/AndroidRuntime(12542): at dalvik.system.NativeStart.main(Native Method)
11-09 13:11:58.558: E/AndroidRuntime(12542): Caused by: java.lang.ClassNotFoundException: android.support.v7.widget.CardView
11-09 13:11:58.558: E/AndroidRuntime(12542): at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:61)
11-09 13:11:58.558: E/AndroidRuntime(12542): at java.lang.ClassLoader.loadClass(ClassLoader.java:501)
11-09 13:11:58.558: E/AndroidRuntime(12542): at java.lang.ClassLoader.loadClass(ClassLoader.java:461)
11-09 13:11:58.558: E/AndroidRuntime(12542): at android.view.LayoutInflater.createView(LayoutInflater.java:552)
11-09 13:11:58.558: E/AndroidRuntime(12542): at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:687)
11-09 13:11:58.558: E/AndroidRuntime(12542): ... 19 more
下面是java代码:
public class ThirdFragment extends Fragment {
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.activity_city, container, false);
return rootView;
}
}
以下是布局代码:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:card_view="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
>
<!-- A CardView that contains a TextView -->
<android.support.v7.widget.CardView
xmlns:card_view="http://schemas.android.com/apk/res-auto"
android:id="@+id/card_view"
android:layout_gravity="center"
android:layout_width="200dp"
android:layout_height="200dp"
>
<TextView
android:id="@+id/info_text"
android:layout_width="match_parent"
android:layout_height="match_parent"
/>
</android.support.v7.widget.CardView>
</LinearLayout>
提前感谢问题在于您的依赖关系 试试这个,仔细阅读每一步 来解决此问题。 首先,您必须从中添加cardview
这对我很有用。您需要在
编辑build.gradle并在依赖项部分指定“com.android.support:cardview-v7:21.0.+”。我通过在app/build.gradle上添加更新的cardview和appcompat解决了这个问题
dependencies {
...
compile 'com.android.support:appcompat-v7:23.4.0'
compile 'com.android.support:cardview-v7:23.4.0'
compile 'com.android.support:recyclerview-v7:23.4.0'
}
然后在检查所有依赖项的同时重新构建项目,只需检查相关的JAVA类文件,无论是否扩展AppCompatACtivity。
当然这会对你有帮助。上面的答案没有帮助。添加后效果良好
<android.support.v7.widget.CardView
...
xmlns:app="http://schemas.android.com/apk/res-auto"
app:cardBackgroundColor="@android:color/transparent">
无法解释。问题也可能是由于使用了
androidX
尝试更改为
如果此错误发生在AndroidX中,则需要使用以下依赖项来修复此错误:
implementation 'androidx.cardview:cardview:1.0.0'
例如,只需在xml文件中找到您的cardview布局
<android.support.v7.widget.CardView......</android.support.v7.widget.CardView>
您可能会遇到此错误,因为您可能从网页复制了代码,并将其粘贴到项目中,尤其是在布局中。请不要这样做,如果这样做了,您应该会看到设计部分是否正常。我也遇到了相同的错误,并通过自己的实现解决了它。此错误是由于您可能正在使用AndroidX,但您正在使用此依赖项:
implementation 'com.android.support:cardview-v7:27.1.1'
更改为AndroidX CardView依赖项
implementation 'androidx.cardview:cardview:1.0.0'
并将类更改为布局:
<androidx.cardview.widget.CardView
修复错误是的,将app:cardBackgroundColor=“?cardBackgroundColor”更改为app:cardBackgroundColor=“@android:color/transparent”更新,现在您应该使用androidx.cardwiew.widget.cardwiew这是否回答了您的问题?
<androidx.cardview.widget.CardView