没有找到类“android.support.v7.widget.CardView”

Question

我在这里看到了很多这样的问题，他们都有相同的答案，确保你有

编译'com.android.support:cardview-v7:26.0.0'

在您的 build.gradle 文件中，并确保您在 xml 中使用完全限定名称...

<android.support.v7.widget.CardView

我在我的 xml 文件中使用它，并且我的 build.gradle 文件中有编译行。应用程序编译，但每当我在模拟器上运行应用程序时，我单击按钮启动 ShowImagesActivity，它崩溃并显示消息“在路径上找不到类 'android.support.v7.widget.CardView'... "

这是我的 layout_images.xml 文件...

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
              android:orientation="vertical"
              android:layout_width="match_parent"
              android:layout_height="match_parent">

    <adroid.support.v7.widget.CardView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_margin="8dp"
        android:padding="8dp">
        <RelativeLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:minHeight="100dp">
            <TextView
                android:id="@+id/textViewName"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:text="Name"
                android:textAlignment="center" />
            <ImageView
                android:id="@+id/imageView"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_below="@id/textViewName" />
        </RelativeLayout>
    </adroid.support.v7.widget.CardView>

</LinearLayout>

这是我的 build.gradle 文件，应用程序...

apply plugin: 'com.android.application'
check.dependsOn 'assembleMinSdkJellybeanDebugAndroidTest', 'assembleMinSdkIcsDebugAndroidTest'

android {
    compileSdkVersion 26
    buildToolsVersion '26.0.0'
    flavorDimensions "minSdkVersion"

    defaultConfig {
        applicationId "com.google.firebase.quickstart.auth"
        minSdkVersion 26
        targetSdkVersion 26
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner 'android.support.test.runner.AndroidJUnitRunner'
    }

    buildTypes {
        release {
            minifyEnabled true
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }

    lintOptions {
        abortOnError false
    }

    productFlavors {
        // Build variant with minSdk 16 to include Facebook and FirebaseUI libraries.
        minSdkJellybean {
            dimension "minSdkVersion"
            minSdkVersion 16
        }
        // Build variant with minSdk 14, excludes Facebook and FirebaseUI libraries.
        minSdkIcs {
            dimension "minSdkVersion"
            minSdkVersion 16
        }
    }
}

configurations.all {
    resolutionStrategy.force 'com.android.support:support-annotations:26.0.0'
}

dependencies {
    // Firebase Authentication
    // Google Sign In SDK (only required for Google Sign In)
    // Firebase UI
    // Used in FirebaseUIActivity. The FirebaseUI-Android library has a minSdk level of 16
    // so this library is only included in the minSdkJellybean variant.
    // Facebook Android SDK (only required for Facebook Login)
    // Used in FacebookLoginActivity. This is only compiled into the minSdkJellybean variant of this
    // app. You can build a 'minSdkGingerbread' variant to test on devices with 9 <= SDK <= 15.
    // Twitter Android SDK (only required for Twitter Login)
    compile('com.twitter.sdk.android:twitter-core:1.6.6@aar') {
        transitive = true
    }
    compile('com.twitter.sdk.android:twitter:1.13.1@aar') {
        transitive = true
    }
    compile 'com.google.firebase:firebase-storage:11.2.0'
    compile 'com.google.firebase:firebase-storage:11.2.0'
    compile 'com.android.support:appcompat-v7:26.0.0'
    compile 'com.android.support:animated-vector-drawable:26.0.0'
    compile 'com.android.support:cardview-v7:26.0.0'
    compile 'com.android.support:recyclerview-v7:26.0.0'
    compile 'com.android.support:design:26.0.0'
    compile 'com.firebaseui:firebase-ui:2.3.0'
    compile 'com.google.firebase:firebase-auth:11.2.0'
    compile 'com.google.android.gms:play-services-auth:11.2.0'
    compile 'com.android.support.constraint:constraint-layout:1.0.2'
    compile 'com.google.firebase:firebase-database:11.2.0'
    androidTestCompile 'com.android.support.test.espresso:espresso-core:2.2.2'
    androidTestCompile 'com.android.support.test:runner:0.5'
    minSdkJellybeanCompile 'com.facebook.android:facebook-android-sdk:4.9.0'
    minSdkJellybeanCompile 'com.android.support:customtabs:26.0.0'
}

apply plugin: 'com.google.gms.google-services'

在我正在使用的代码中

@Override
    public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View                    v          = LayoutInflater.from(parent.getContext()).inflate(R.layout.layout_images, parent, false);
        ViewHolder viewHolder = new ViewHolder(v);
        return viewHolder;
    }

我拥有所有其他帖子所说的我需要的一切，我的 build.gradle 中的编译行和我的 xml 视图中的完全限定名称，并且应用程序编译完美，每当我尝试运行它时它就会崩溃单击启动 ShowImagesActivity 的按钮后的模拟器。如果找不到类，它不应该编译失败吗？是否有任何其他解决方案，或者任何人都可以看到由于无法找到课程而导致应用程序崩溃的任何错误？谢谢。

Answer 1

我遇到了同样的问题，但我的库已更新为 androidX

implementation 'androidx.cardview:cardview:1.0.0'

因此我的问题通过使用标签解决了

<androidx.cardview.widget.CardView/>

Answer 2

检查您的输入，您在 XML 中缺少一个“n”

<adroid.support.v7.widget.CardView ...

Answer 3

我试试 xml

点击{更改为 android.support.v7.widget.CardView}

没有发生崩溃