BarInsta/app/src/main/res/layout/activity_camera.xml

<?xml version="1.0" encoding="utf-8"?>
<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">

    <androidx.appcompat.widget.AppCompatImageButton
        android:id="@+id/camera_capture_button"
        android:layout_width="80dp"
        android:layout_height="80dp"
        android:layout_marginBottom="80dp"
        android:background="@android:color/transparent"
        android:elevation="2dp"
        android:scaleType="fitCenter"
        android:src="@drawable/ic_shutter"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent" />

    <androidx.camera.view.PreviewView
        android:id="@+id/view_finder"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:clickable="true"
        android:focusable="true" />

    <androidx.appcompat.widget.AppCompatImageButton
        android:id="@+id/switch_camera"
        android:layout_width="40dp"
        android:layout_height="40dp"
        android:layout_marginStart="40dp"
        android:layout_marginBottom="100dp"
        android:background="@android:color/transparent"
        android:scaleType="fitCenter"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:srcCompat="@drawable/ic_round_flip_camera_24"
        app:tint="@color/white" />

    <androidx.appcompat.widget.AppCompatImageButton
        android:id="@+id/close"
        android:layout_width="40dp"
        android:layout_height="40dp"
        android:layout_marginEnd="40dp"
        android:layout_marginBottom="100dp"
        android:background="@android:color/transparent"
        android:scaleType="fitCenter"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:srcCompat="@drawable/ic_close_24"
        app:tint="@color/white" />

</androidx.constraintlayout.widget.ConstraintLayout>