运动布局 <onSwipe> 没有动画

Question

我有一个场景，它有一个开始约束布局和一个结束。问题是，滑动动画很突然。它只是在单个帧中将开始到结束以及结束到开始进行转换，并且不进行动画处理。Onclick 手势确实有动画效果，但我想使用滑动手势

xml 文件夹内的motionscene.xml

<?xml version="1.0" encoding="utf-8"?>
<MotionScene
    xmlns:motion="http://schemas.android.com/apk/res-auto">

    <Transition
        motion:constraintSetStart="@layout/backdrop_layout_end"
        motion:constraintSetEnd="@layout/backdrop_layout_start"
        motion:motionInterpolator="easeInOut"
        motion:transitionDisable="false"
        motion:duration="200">

        <OnSwipe
            motion:touchAnchorId="@id/toggle"
            motion:dragDirection="dragDown"
            motion:maxAcceleration=".5"
            />

    </Transition>

</MotionScene>

布局文件夹内的layout_start.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:motion="http://schemas.android.com/tools">

    <androidx.constraintlayout.widget.ConstraintLayout
        android:id="@+id/backdrop_back"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintBottom_toBottomOf="parent"
        android:background="@color/amber_800"

        android:orientation="vertical"
        android:layout_width="match_parent"
        android:layout_height="match_parent">

    </androidx.constraintlayout.widget.ConstraintLayout>

    <androidx.constraintlayout.widget.ConstraintLayout
        android:id="@+id/backdrop_front"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintTop_toTopOf="parent"

        app:layout_constraintVertical_bias="1"
        android:background="@drawable/upper_rounded_corners"
        android:orientation="vertical"
        android:layout_width="match_parent"
        android:layout_height="100dp">

        <ImageView
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintTop_toTopOf="parent"
            android:layout_marginTop="@dimen/margin_10"

            android:id="@+id/toggle"
            android:layout_gravity="center"
            android:src="@drawable/ic_adjust"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"/>

    </androidx.constraintlayout.widget.ConstraintLayout>

</androidx.constraintlayout.widget.ConstraintLayout>

布局文件夹中的layout_end.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:motion="http://schemas.android.com/tools">

    <androidx.constraintlayout.widget.ConstraintLayout
        android:id="@+id/backdrop_back"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintBottom_toBottomOf="parent"
        android:background="@color/amber_800"

        android:orientation="vertical"
        android:layout_width="match_parent"
        android:layout_height="match_parent">

    </androidx.constraintlayout.widget.ConstraintLayout>

    <androidx.constraintlayout.widget.ConstraintLayout
        android:layout_height="match_parent"
        android:id="@+id/backdrop_front"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintBottom_toBottomOf="parent"

        app:layout_constraintVertical_bias="1"
        android:layout_marginTop="@dimen/margin_10"

        android:background="@drawable/upper_rounded_corners"
        android:orientation="vertical"
        android:layout_width="match_parent">

        <ImageView
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintTop_toTopOf="parent"
            android:layout_marginTop="@dimen/margin_10"

            android:id="@+id/toggle"
            android:layout_gravity="center"
            android:src="@drawable/ic_adjust"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"/>

    </androidx.constraintlayout.widget.ConstraintLayout>

</androidx.constraintlayout.widget.ConstraintLayout>

另外，我在运动场景的“end”参数中使用layout_start，在“start”参数中使用layout_end。这不是一个错字。如果我采取相反的方式，则向下滑动寄存器向上切换，向上滑动寄存器向下切换。我几乎相信这个库有一个错误。任何帮助表示赞赏。谢谢 ！