如何将视图宽度设置为父宽度的百分比- ConstraintLayout中的边距空间？

<androidx.constraintlayout.widget.ConstraintLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <View
        android:id="@+id/myView"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:background="#FF0000"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintWidth_percent="0.5" />

</androidx.constraintlayout.widget.ConstraintLayout>