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

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    tools:context=".CameraActivity"
    android:background="@color/fullScreenBackgroundColor">

    <androidx.camera.view.PreviewView
        android:id="@+id/camera_preview"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:layout_centerInParent="true"/>

    <androidx.constraintlayout.widget.ConstraintLayout
        android:layout_width="match_parent"
        android:layout_height="40dp"
        android:layout_marginTop="20dp">

        <ImageButton
            android:id="@+id/image_capture_mode"
            android:layout_width="30dp"
            android:layout_height="30dp"
            android:src="@drawable/icon_high_quality"
            android:background="#00000000"
            android:scaleType="fitCenter"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toStartOf="@id/image_ratio"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent"/>

        <ImageButton
            android:id="@+id/image_ratio"
            android:layout_width="30dp"
            android:layout_height="30dp"
            android:src="@drawable/icon_aspect_ratio"
            android:background="#00000000"
            android:scaleType="fitCenter"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toStartOf="@id/image_timer"
            app:layout_constraintStart_toEndOf="@id/image_capture_mode"
            app:layout_constraintTop_toTopOf="parent" />

        <ImageButton
            android:id="@+id/image_timer"
            android:layout_width="30dp"
            android:layout_height="30dp"
            android:src="@drawable/icon_timer_off"
            android:background="#00000000"
            android:scaleType="fitCenter"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toStartOf="@id/image_flash"
            app:layout_constraintStart_toEndOf="@id/image_ratio"
            app:layout_constraintTop_toTopOf="parent" />

        <ImageButton
            android:id="@+id/image_flash"
            android:layout_width="30dp"
            android:layout_height="30dp"
            android:src="@drawable/icon_flash_auto"
            android:background="#00000000"
            android:scaleType="fitCenter"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toEndOf="@id/image_timer"
            app:layout_constraintTop_toTopOf="parent" />

    </androidx.constraintlayout.widget.ConstraintLayout>

    <TextView
        android:id="@+id/text_timer"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textSize="100sp"
        android:layout_centerInParent="true"
        android:visibility="gone"/>

    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="60dp"
        android:layout_alignParentBottom="true"
        android:layout_marginBottom="30dp">

        <ImageButton
            android:id="@+id/image_mode_switch"
            android:layout_width="30dp"
            android:layout_height="30dp"
            android:src="@drawable/icon_video"
            android:background="#00000000"
            android:scaleType="fitCenter"
            android:layout_alignEnd="@id/layout_record_buttons"
            android:layout_marginEnd="120dp"
            android:layout_centerVertical="true"/>

        <RelativeLayout
            android:id="@+id/layout_record_buttons"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_centerInParent="true">

            <ImageView
                android:id="@+id/record_video_button"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:src="@drawable/record_video_button"
                android:visibility="gone"/>

            <sushi.hardcore.droidfs.widgets.TakePhotoButton
                android:id="@+id/take_photo_button"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:src="@drawable/take_photo_button"/>

        </RelativeLayout>

        <ImageButton
            android:id="@+id/image_camera_switch"
            android:layout_width="30dp"
            android:layout_height="30dp"
            android:src="@drawable/icon_camera_front"
            android:background="#00000000"
            android:scaleType="fitCenter"
            android:layout_alignStart="@id/layout_record_buttons"
            android:layout_marginStart="120dp"
            android:layout_centerVertical="true"/>

    </RelativeLayout>

</RelativeLayout>