Android 未找到MotionLayout类或未找到属性layoutDescription

Android 未找到MotionLayout类或未找到属性layoutDescription,android,xml,gradle,android-motionlayout,Android,Xml,Gradle,Android Motionlayout,我正试图遵循谷歌的MotionLayout教程,但似乎无法构建项目,甚至无法找到类 这是xml <androidx.constraintlayout.motion.widget.MotionLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://sc

我正试图遵循谷歌的MotionLayout教程,但似乎无法构建项目,甚至无法找到类

这是xml

<androidx.constraintlayout.motion.widget.MotionLayout
    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" 
    app:layoutDescription="@xml/step1_completed">

<ImageView
        android:id="@+id/red_star"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        app:srcCompat="@drawable/ic_star_outline"
        android:tint="?colorSecondary"
        android:contentDescription="@string/star"
        android:layout_marginTop="30dp"
        android:layout_marginStart="30dp"
        android:layout_marginBottom="30dp"
        android:layout_marginEnd="30dp"/>

</androidx.constraintlayout.motion.widget.MotionLayout>
这是我试着跑步时得到的

AAPT: error: attribute layoutDescription (aka com.google.samples.motionlayoutcodelab:layoutDescription) not found.

感谢使用AndroidX版本的依赖项:

implementation 'androidx.constraintlayout:constraintlayout:2.0.0-beta4'

使用依赖项的AndroidX版本:

implementation 'androidx.constraintlayout:constraintlayout:2.0.0-beta4'