Signal-Android/app/src/main/res/layout/camera_fragment.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    tools:viewBindingIgnore="true"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <com.google.android.material.card.MaterialCardView
        android:id="@+id/camera_preview_parent"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        app:cardCornerRadius="18dp"
        app:cardElevation="0dp"
        app:layout_constraintBottom_toBottomOf="parent">

        <TextureView
            android:id="@+id/camera_preview"
            android:layout_width="match_parent"
            android:layout_height="match_parent" />

    </com.google.android.material.card.MaterialCardView>

    <FrameLayout
        android:id="@+id/camera_controls_container"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintTop_toTopOf="@id/camera_preview_parent" />

</androidx.constraintlayout.widget.ConstraintLayout>