更改MotionLayout中的自定义属性

<androidx.constraintlayout.motion.widget.MotionLayout
    android:id="@+id/motionLayout"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <ImageView
        android:id="@+id/imageView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:customAttribute="initialValue" />

</androidx.constraintlayout.motion.widget.MotionLayout>

<MotionScene xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:motion="http://schemas.android.com/apk/res-auto">

    <Transition
        motion:constraintSetStart="@id/start"
        motion:constraintSetEnd="@id/end">

        <KeyFrameSet>
            <CustomAttribute
                motion:framePosition="0"
                motion:customAttribute="customAttribute"
                motion:valueType="floatType"
                motion:value="initialValue" />

            <CustomAttribute
                motion:framePosition="100"
                motion:customAttribute="customAttribute"
                motion:valueType="floatType"
                motion:value="finalValue" />
        </KeyFrameSet>

    </Transition>

    <ConstraintSet android:id="@+id/start">
        <!-- 初始约束集 -->
    </ConstraintSet>

    <ConstraintSet android:id="@+id/end">
        <!-- 结束约束集 -->
    </ConstraintSet>

</MotionScene>

MotionLayout motionLayout = findViewById(R.id.motionLayout);
motionLayout.setFloat(R.id.imageView, "customAttribute", newValue);