更改MotionLayout中嵌套布局的尺寸

<androidx.constraintlayout.motion.widget.MotionLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <!-- 嵌套布局 -->
    <LinearLayout
        android:id="@+id/nestedLayout"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content">

        <!-- 嵌套布局的内容 -->

    </LinearLayout>

</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>
            <!-- 定义关键帧 -->
        </KeyFrameSet>

        <ConstraintSet android:id="@+id/start">
            <!-- 开始状态的约束 -->
        </ConstraintSet>

        <ConstraintSet android:id="@+id/end">
            <!-- 结束状态的约束 -->
        </ConstraintSet>

    </Transition>

</MotionScene>

<KeyFrameSet>
    <KeyAttribute
        motion:framePosition="0"
        motion:target="@id/nestedLayout"
        motion:attributeName="layout_width"
        motion:valueType="intType"
        motion:value="200" />

    <KeyAttribute
        motion:framePosition="100"
        motion:target="@id/nestedLayout"
        motion:attributeName="layout_width"
        motion:valueType="intType"
        motion:value="400" />
</KeyFrameSet>

<ConstraintSet android:id="@+id/start">
    <Constraint
        android:id="@id/nestedLayout"
        android:layout_width="200dp"
        android:layout_height="wrap_content" />
</ConstraintSet>

<ConstraintSet android:id="@+id/end">
    <Constraint
        android:id="@id/nestedLayout"
        android:layout_width="400dp"
        android:layout_height="wrap_content" />
</ConstraintSet>