尝试使用RecyclerView时出错-为什么？

时间：2019-12-04 09:55:27

标签： android android-recyclerview

我是一名新的Android Studio开发人员，正在研究如何使用RecyclerView，但似乎无法使用我在google和youtube上搜索到的所有教程都可以使用它。当我尝试运行在此网站上复制的代码时，出现以下错误-https://medium.com/android-grid/how-to-use-firebaserecycleradpater-with-latest-firebase-dependencies-in-android-aff7a33adb8b

请帮助。我正在使用最新的AndroidStudio版本。

错误：

E/AndroidRuntime: FATAL EXCEPTION: main
    Process: com.itbscorp.testrecycler, PID: 18467
    java.lang.RuntimeException: Unable to start activity ComponentInfo{com.itbscorp.testrecycler/com.itbscorp.testrecycler.MainActivity}: android.view.InflateException: Binary XML file line #33: Binary XML file line #33: Error inflating class android.support.v7.widget.RecyclerView
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2913)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3048)
        at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:78)
        at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:108)
        at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:68)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1808)
        at android.os.Handler.dispatchMessage(Handler.java:106)
        at android.os.Looper.loop(Looper.java:193)
        at android.app.ActivityThread.main(ActivityThread.java:6669)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)
     Caused by: android.view.InflateException: Binary XML file line #33: Binary XML file line #33: Error inflating class android.support.v7.widget.RecyclerView
     Caused by: android.view.InflateException: Binary XML file line #33: Error inflating class android.support.v7.widget.RecyclerView
     Caused by: java.lang.ClassNotFoundException: Didn't find class "android.support.v7.widget.RecyclerView" on path: DexPathList[[zip file "/data/app/com.itbscorp.testrecycler-kbheTQbZQdBBMxi8OmT9Ew==/base.apk"],nativeLibraryDirectories=[/data/app/com.itbscorp.testrecycler-kbheTQbZQdBBMxi8OmT9Ew==/lib/x86, /system/lib]]
        at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:134)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:379)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:312)
        at android.view.LayoutInflater.createView(LayoutInflater.java:606)
        at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:790)
        at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:730)
        at android.view.LayoutInflater.rInflate(LayoutInflater.java:863)
        at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:824)
        at android.view.LayoutInflater.inflate(LayoutInflater.java:515)
        at android.view.LayoutInflater.inflate(LayoutInflater.java:423)
        at android.view.LayoutInflater.inflate(LayoutInflater.java:374)
        at androidx.appcompat.app.AppCompatDelegateImpl.setContentView(AppCompatDelegateImpl.java:555)
        at androidx.appcompat.app.AppCompatActivity.setContentView(AppCompatActivity.java:161)
        at com.itbscorp.testrecycler.MainActivity.onCreate(MainActivity.java:43)
        at android.app.Activity.performCreate(Activity.java:7136)
        at android.app.Activity.performCreate(Activity.java:7127)
        at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1271)
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2893)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3048)
        at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:78)
        at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:108)
        at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:68)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1808)
        at android.os.Handler.dispatchMessage(Handler.java:106)
        at android.os.Looper.loop(Looper.java:193)
        at android.app.ActivityThread.main(ActivityThread.java:6669)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)

MainActivity.java 

public class Model {
    public String mId, mTitle, mDesc;

    public Model() {

    }

    public Model(String mId, String mTitle, String mDesc) {
        this.mId = mId;
        this.mTitle = mTitle;
        this.mDesc = mDesc;
    }

    public String getmId() {
        return mId;
    }

    public void setmId(String mId) {
        this.mId = mId;
    }

    public String getmTitle() {
        return mTitle;
    }

    public void setmTitle(String mTitle) {
        this.mTitle = mTitle;
    }

    public String getmDesc() {
        return mDesc;
    }

    public void setmDesc(String mDesc) {
        this.mDesc = mDesc;
    }
}

activity_main.xml 

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

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical">
        <EditText
            android:id="@+id/et"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:padding="8dp"
            android:layout_gravity="center" />
        <EditText
            android:id="@+id/etd"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:padding="8dp"
            android:layout_gravity="center" />
        <Button
            android:id="@+id/btn"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Add"/>
    </LinearLayout>

    <android.support.v7.widget.RecyclerView
        android:id="@+id/list"
        android:layout_width="match_parent"
        android:layout_height="match_parent">
    </android.support.v7.widget.RecyclerView>

</LinearLayout>

Model.java 

public class Model {
    public String mId, mTitle, mDesc;

    public Model() {

    }

    public Model(String mId, String mTitle, String mDesc) {
        this.mId = mId;
        this.mTitle = mTitle;
        this.mDesc = mDesc;
    }

    public String getmId() {
        return mId;
    }

    public void setmId(String mId) {
        this.mId = mId;
    }

    public String getmTitle() {
        return mTitle;
    }

    public void setmTitle(String mTitle) {
        this.mTitle = mTitle;
    }

    public String getmDesc() {
        return mDesc;
    }

    public void setmDesc(String mDesc) {
        this.mDesc = mDesc;
    }
}

list_item.xml 

<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_marginBottom="8dp"
    android:layout_marginEnd="16dp"
    android:layout_marginLeft="16dp"
    android:layout_marginRight="16dp"
    android:layout_marginStart="16dp"
    android:layout_marginTop="8dp">

    <LinearLayout
        android:id="@+id/list_root"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:clickable="true"
        android:focusable="true"
        android:orientation="vertical"
        android:background="?attr/selectableItemBackground"
        android:padding="16dp">

        <TextView
            android:id="@+id/list_title"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="Title"
            android:textColor="#000000"
            android:textSize="16sp"
            android:textStyle="bold" />

        <TextView
            android:id="@+id/list_desc"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="4dp"
            android:text="Description" />

    </LinearLayout>

</android.support.v7.widget.CardView>

build.grade文件

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

android {
    compileSdkVersion 29
    buildToolsVersion "29.0.2"
    defaultConfig {
        applicationId "com.itbscorp.testrecycler"
        minSdkVersion 21
        targetSdkVersion 29
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation 'androidx.appcompat:appcompat:1.1.0'
    implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
    implementation 'com.firebaseui:firebase-ui-database:6.1.0'
    implementation 'com.firebaseui:firebase-ui-firestore:6.1.0'
    implementation 'com.firebaseui:firebase-ui-auth:6.1.0'
    implementation 'com.firebaseui:firebase-ui-storage:6.1.0'
    implementation 'com.google.firebase:firebase-database:16.0.4'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'androidx.test.ext:junit:1.1.1'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'
}

2 个答案:

答案 0 :(得分：1)

您使用的是android.support.v7.widget.RecyclerView，该视图已过时且未包含在您的项目中。

请确保在您的build.gradle中包含android.support.v7.widget.RecyclerView，或者使用androidx recyclerview库进行重构。

对于旧的支持库，请使用： addpassenger

对于AndroidX： Filename: "msiexec.exe"; Parameters: "/q /i ""{app}\mongodb-win32.msi""" 并使用androidx.recyclerview.widget.RecyclerView更改XML中的android.support.v7.widget.RecyclerView。

答案 1 :(得分：1)

您应该更改 从您的xml中的android.support.v7.widget.RecyclerView到androidx.recyclerview.widget.RecyclerView.

并在项目依赖项中检查是否为recyclerview设置了正确的

implementation 'androidx.recyclerview:recyclerview:1.1.0'

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