我有一个圆角布局，它有一个内部没有角的子项，可以移动。当这个子项在一边时，它不尊重父项的圆角。
这就是我想要达到的目标：

这是我目前拥有的：

很抱歉第二张图片的质量不好，但你可以在这里看到，因为孩子的原因，边角不圆。
这是我正在使用的布局：

<androidx.constraintlayout.widget.ConstraintLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@drawable/bg_pill_selector_button_switch_parent">

    <FrameLayout
        android:layout_width="@dimen/no_width"
        android:layout_height="@dimen/no_width"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <com.mb.components.widget.MBLabel
        android:id="@+id/lbFirstButtonPillSelectorSwitch"
        style="@style/MBPillSelectorButtonSwitchText"
        android:layout_width="@dimen/no_width"
        android:layout_height="@dimen/no_width"
        android:background="@drawable/bg_pill_selector_button_switch_element"
        app:layout_constraintBottom_toTopOf="@+id/glPillSelectorSwitch"
        app:layout_constraintEnd_toStartOf="@+id/gl2PillSelectorSwitch"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        tools:text="Gastos" />

    <com.mb.components.widget.MBLabel
        android:id="@+id/lbSecondButtonPillSelectorSwitch"
        style="@style/MBPillSelectorButtonSwitchText"
        android:layout_width="@dimen/no_width"
        android:layout_height="@dimen/no_width"
        android:background="@drawable/bg_pill_selector_button_switch_element"
        app:layout_constraintBottom_toBottomOf="@+id/glPillSelectorSwitch"
        app:layout_constraintEnd_toStartOf="@+id/gl3PillSelectorSwitch"
        app:layout_constraintStart_toEndOf="@+id/gl2PillSelectorSwitch"
        app:layout_constraintTop_toTopOf="parent"
        tools:text="Ingresos" />

    <com.mb.components.widget.MBLabel
        android:id="@+id/lbThirdButtonPillSelectorSwitch"
        style="@style/MBPillSelectorButtonSwitchText"
        android:layout_width="@dimen/no_width"
        android:layout_height="@dimen/no_width"
        android:background="@drawable/bg_pill_selector_button_switch_element"
        app:layout_constraintBottom_toTopOf="@+id/glPillSelectorSwitch"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="@+id/gl3PillSelectorSwitch"
        app:layout_constraintTop_toTopOf="parent"
        tools:text="Otros" />

    <androidx.constraintlayout.widget.Guideline
        android:id="@+id/glPillSelectorSwitch"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        app:layout_constraintGuide_begin="@dimen/begin_guideline_pill_selector_button_switch" />

    <androidx.constraintlayout.widget.Guideline
        android:id="@+id/gl2PillSelectorSwitch"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        app:layout_constraintGuide_percent="0.33" />

    <androidx.constraintlayout.widget.Guideline
        android:id="@+id/gl3PillSelectorSwitch"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        app:layout_constraintGuide_percent="0.67" />

    <FrameLayout
        android:id="@+id/framePillSelectorSwitch"
        android:layout_width="@dimen/no_width"
        android:layout_height="@dimen/no_width"
        android:background="@drawable/bg_pill_selector_button_switch_selected"
        app:layout_constraintBottom_toTopOf="@+id/glPillSelectorSwitch"
        app:layout_constraintEnd_toStartOf="@+id/gl2PillSelectorSwitch"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>