如何在focusArea周围的TextureView上添加Shadow

我正在Android Studio中构建一个qr扫描仪，并使用cameraX Api，并使用TextureView进行预览。在布局中，我希望像大多数qr扫描仪应用程序一样，在textureview上形成阴影。

我当前的屏幕是 我的屏幕

我想要像phonepe qr这样的东西

所以我如何在焦点区域周围添加覆盖。是否有可能在布局中使用或我必须使用CustomView？

我当前的布局是

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

<data>

</data>

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




    <TextureView
        android:id="@+id/texture_view"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:visibility="visible"
        app:layout_constraintTop_toTopOf="@+id/included"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
         />

    <include
        android:id="@+id/included"
        layout="@layout/custom_toolbar"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintEnd_toEndOf="parent"/>






    <View
        android:id="@+id/texture_view_border"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:background="@drawable/scanner_border"
        app:layout_constraintBottom_toTopOf="@id/guideline_horizontal_mid"
        app:layout_constraintDimensionRatio="1:1"
        app:layout_constraintEnd_toStartOf="@id/guideline_vertcal_right"
        app:layout_constraintStart_toEndOf="@id/guideline_vertcal_left"
        app:layout_constraintTop_toBottomOf="@id/guideline_horizontal_up" />

    <TextView
        android:id="@+id/qr_code_tv"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="20dp"
        android:text="Scan QR code"
        android:textAppearance="@style/TextAppearance.AppCompat.Medium"
        android:textColor="@color/colorWhite"
        app:layout_constraintStart_toStartOf="@id/guideline_vertcal_left"
        app:layout_constraintEnd_toEndOf="@id/guideline_vertcal_right"
        app:layout_constraintTop_toBottomOf="@id/texture_view_border"
        />


    <androidx.constraintlayout.widget.Guideline
        android:id="@+id/guideline_vertcal_left"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        app:layout_constraintGuide_percent="0.1" />

    <androidx.constraintlayout.widget.Guideline
        android:id="@+id/guideline_vertcal_right"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        app:layout_constraintGuide_percent="0.90" />

    <androidx.constraintlayout.widget.Guideline
        android:id="@+id/guideline_horizontal_up"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        app:layout_constraintGuide_percent="0.20" />

    <androidx.constraintlayout.widget.Guideline
        android:id="@+id/guideline_horizontal_mid"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        app:layout_constraintGuide_percent="0.80" />

    <View
        android:id="@+id/scanner_bar"
        android:layout_width="0dp"
        android:layout_height="2dp"
        android:background="@color/colorLoginPrimary"
        android:visibility="visible"
        app:layout_constraintBottom_toBottomOf="@id/texture_view_border"
        app:layout_constraintEnd_toEndOf="@id/texture_view_border"
        app:layout_constraintStart_toStartOf="@id/texture_view_border"
        app:layout_constraintTop_toTopOf="@id/texture_view_border" />

    <View
        android:layout_width="30dp"
        android:layout_height="5dp"
        android:background="@color/colorLoginPrimary"
        app:layout_constraintStart_toStartOf="@id/texture_view_border"
        app:layout_constraintTop_toTopOf="@id/texture_view_border" />

    <View
        android:layout_width="5dp"
        android:layout_height="30dp"
        android:background="@color/colorLoginPrimary"
        app:layout_constraintStart_toStartOf="@id/texture_view_border"
        app:layout_constraintTop_toTopOf="@+id/texture_view_border" />

    <View
        android:layout_width="30dp"
        android:layout_height="5dp"
        android:background="@color/colorLoginPrimary"
        app:layout_constraintEnd_toEndOf="@id/texture_view_border"
        app:layout_constraintTop_toTopOf="@id/texture_view_border" />

    <View
        android:layout_width="5dp"
        android:layout_height="30dp"
        android:background="@color/colorLoginPrimary"
        app:layout_constraintEnd_toEndOf="@+id/texture_view_border"
        app:layout_constraintTop_toTopOf="@id/texture_view_border" />

    <View
        android:id="@+id/view"
        android:layout_width="30dp"
        android:layout_height="5dp"
        android:background="@color/colorLoginPrimaryDark"
        app:layout_constraintBottom_toBottomOf="@id/texture_view_border"
        app:layout_constraintStart_toStartOf="@id/texture_view_border" />

    <View
        android:layout_width="30dp"
        android:layout_height="5dp"
        android:background="@color/colorLoginPrimary"
        app:layout_constraintBottom_toBottomOf="@id/texture_view_border"
        app:layout_constraintEnd_toEndOf="@+id/texture_view_border" />

    <View
        android:layout_width="5dp"
        android:layout_height="30dp"
        android:background="@color/colorLoginPrimary"
        app:layout_constraintBottom_toBottomOf="@+id/texture_view_border"
        app:layout_constraintStart_toStartOf="@id/texture_view_border" />

    <View
        android:layout_width="5dp"
        android:layout_height="30dp"
        android:background="@color/colorLoginPrimary"
        app:layout_constraintBottom_toBottomOf="@+id/texture_view_border"
        app:layout_constraintEnd_toEndOf="@id/texture_view_border" />


</androidx.constraintlayout.widget.ConstraintLayout>