我想在我的项目中使用 CardView，但当我运行应用程序时，出现了以下错误。我正在使用 Eclipse。
Error: Error inflating class and android.support.v7.widget.CardView
The graphical view of my xml file says 'The following classes could not be instantiated:
- android.support.v7.widget.CardView (Open Class, Show Error Log)
See the Error Log (Window > Show View) for more details.'
请帮忙。
这是我的片段布局，我使用了CardView。
<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.log.MyContactsFragment" >
<!-- TODO: Update blank fragment layout -->
<android.support.v7.widget.CardView
xmlns:card_view="http://schemas.android.com/apk/res-auto"
android:id="@+id/cvContactDetails"
android:layout_width="match_parent"
android:layout_height="200dp"
android:layout_gravity="center"
android:background="?android:attr/selectableItemBackground"
android:clickable="false"
android:elevation="20dp" >
<TextView
android:id="@+id/tvContacts"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Contact Info" />
<Button
android:id="@+id/bDelete"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Delete" />
<Button
android:id="@+id/bExport"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Export to phone contacts" />
</android.support.v7.widget.CardView>
这是我的活动布局。
<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.widget.DrawerLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/drawerLayout"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<FrameLayout
android:id="@+id/flMainContent"
android:layout_width="match_parent"
android:layout_height="match_parent" >
</FrameLayout>
<ListView
android:id="@+id/lvLeftDrawer"
android:layout_width="200dp"
android:layout_height="match_parent"
android:layout_gravity="left"
android:alpha="255"
android:background="#0B2161"
android:divider="@null"
android:choiceMode="singleChoice" >
</ListView>
<ListView
android:id="@+id/lvRightDrawer"
android:layout_width="200dp"
android:layout_height="match_parent"
android:layout_gravity="right"
android:alpha="255"
android:background="#0B2161"
android:divider="@null"
android:choiceMode="singleChoice" >
</ListView>
</android.support.v4.widget.DrawerLayout>
这是我的日志记录。
FATAL EXCEPTION: main
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.log/com.example.log.HomeScreenActivity}: android.view.InflateException: Binary XML file line #9: Error inflating class android.support.v7.widget.CardView
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2059)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2084)
at android.app.ActivityThread.access$600(ActivityThread.java:130)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1195)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:4745)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
at dalvik.system.NativeStart.main(Native Method)
Caused by: android.view.InflateException: Binary XML file line #9: Error inflating class android.support.v7.widget.CardView
at android.view.LayoutInflater.createView(LayoutInflater.java:613)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:687)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:746)
at android.view.LayoutInflater.inflate(LayoutInflater.java:489)
at android.view.LayoutInflater.inflate(LayoutInflater.java:396)
at com.example.log.MyContactsFragment.onCreateView(MyContactsFragment.java:60)
at android.support.v4.app.Fragment.performCreateView(Fragment.java:1504)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:942)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1121)
at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:682)
at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1484)
at android.support.v4.app.FragmentActivity.onStart(FragmentActivity.java:571)
at android.app.Instrumentation.callActivityOnStart(Instrumentation.java:1163)
at android.app.Activity.performStart(Activity.java:5018)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2032)
... 11 more
Caused by: java.lang.reflect.InvocationTargetException
at java.lang.reflect.Constructor.constructNative(Native Method)
at java.lang.reflect.Constructor.newInstance(Constructor.java:417)
at android.view.LayoutInflater.createView(LayoutInflater.java:587)
25 more
Caused by: java.lang.NoClassDefFoundError: android.support.v7.cardview.R$styleable
at android.support.v7.widget.CardView.initialize(CardView.java:203)
at android.support.v7.widget.CardView.<init>(CardView.java:101)
... 28 more
有遇到同样问题或者解决了这个问题的人，请评论。
android.support.v7添加到你的项目中了？ - Piyush KukadiyaRecyclerView正常工作但是无法使用CardView（如果您正在使用Android Studio），请运行gradle sync，然后刷新布局。这对我有用。 - Jeel Shah