nextcloud-talk-android/app/src/main/res/layout/activity_take_picture.xml

<?xml version="1.0" encoding="utf-8"?><!--
  ~ Nextcloud Talk application
  ~
  ~ @author Andy Scherzinger
  ~ @author Stefan Niedermann
  ~ Copyright (C) 2021 Andy Scherzinger <info@andy-scherzinger.de>
  ~ Copyright (C) 2021 Stefan Niedermann <info@niedermann.it>
  ~
  ~ This program is free software: you can redistribute it and/or modify
  ~ it under the terms of the GNU General Public License as published by
  ~ the Free Software Foundation, either version 3 of the License, or
  ~ at your option) any later version.
  ~
  ~ This program is distributed in the hope that it will be useful,
  ~ but WITHOUT ANY WARRANTY; without even the implied warranty of
  ~ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  ~ GNU General Public License for more details.
  ~
  ~ You should have received a copy of the GNU General Public License
  ~ along with this program.  If not, see <http://www.gnu.org/licenses/>.
  -->

<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@android:color/black"
    android:fitsSystemWindows="true"
    tools:theme="@style/TransparentTheme">

    <androidx.camera.view.PreviewView
        android:id="@+id/preview"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:scaleType="fitCenter" />

    <com.github.chrisbanes.photoview.PhotoView
        android:id="@+id/photo_preview"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:contentDescription="@null"
        android:scaleType="fitCenter"
        android:visibility="invisible" />

    <com.google.android.material.button.MaterialButton
        android:id="@+id/toggle_torch"
        style="@style/Widget.AppTheme.Button.IconButton"
        android:layout_width="48dp"
        android:layout_height="48dp"
        android:layout_alignParentTop="true"
        android:layout_alignParentEnd="true"
        android:layout_marginStart="0dp"
        android:layout_marginTop="12dp"
        android:layout_marginEnd="12dp"
        android:layout_marginBottom="12dp"
        android:contentDescription="@string/take_photo_toggle_torch"
        android:insetLeft="4dp"
        android:insetTop="4dp"
        android:insetRight="4dp"
        android:insetBottom="4dp"
        android:tint="@color/white"
        app:backgroundTint="#99121212"
        app:cornerRadius="@dimen/button_corner_radius"
        app:elevation="0dp"
        app:icon="@drawable/ic_baseline_flash_on_24"
        app:iconGravity="textStart"
        app:iconPadding="0dp"
        app:iconSize="24dp"
        app:iconTint="@color/white"
        app:layout_constraintBottom_toBottomOf="@id/takePhoto"
        app:layout_constraintEnd_toStartOf="@id/takePhoto"
        app:layout_constraintStart_toStartOf="parent" />

    <com.google.android.material.button.MaterialButton
        android:id="@+id/switchCamera"
        style="@style/Widget.AppTheme.Button.IconButton"
        android:layout_width="48dp"
        android:layout_height="48dp"
        android:layout_alignParentTop="true"
        android:layout_alignParentEnd="true"
        android:layout_marginStart="12dp"
        android:layout_marginTop="12dp"
        android:layout_marginEnd="8dp"
        android:layout_marginBottom="12dp"
        android:contentDescription="@string/take_photo_switch_camera"
        android:insetLeft="4dp"
        android:insetTop="4dp"
        android:insetRight="4dp"
        android:insetBottom="4dp"
        android:padding="0dp"
        android:tint="@android:color/white"
        app:backgroundTint="#99121212"
        app:cornerRadius="@dimen/button_corner_radius"
        app:elevation="0dp"
        app:icon="@drawable/ic_baseline_flip_camera_android_24"
        app:iconGravity="textStart"
        app:iconPadding="0dp"
        app:iconSize="24dp"
        app:iconTint="@color/white"
        app:layout_constraintBottom_toBottomOf="@id/takePhoto"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toEndOf="@id/takePhoto" />

    <com.google.android.material.button.MaterialButton
        android:id="@+id/retake"
        style="@style/Widget.AppTheme.Button.IconButton"
        android:layout_width="48dp"
        android:layout_height="48dp"
        android:layout_alignParentTop="true"
        android:layout_alignParentEnd="true"
        android:layout_marginBottom="12dp"
        android:contentDescription="@string/take_photo_retake_photo"
        android:insetLeft="0dp"
        android:insetTop="0dp"
        android:insetRight="0dp"
        android:insetBottom="0dp"
        android:padding="0dp"
        android:tint="@android:color/white"
        android:visibility="gone"
        app:backgroundTint="#99121212"
        app:cornerRadius="@dimen/button_corner_radius"
        app:elevation="0dp"
        app:icon="@drawable/ic_refresh"
        app:iconGravity="textStart"
        app:iconPadding="0dp"
        app:iconSize="24dp"
        app:iconTint="@color/white"
        app:layout_constraintBottom_toBottomOf="@id/takePhoto"
        app:layout_constraintEnd_toStartOf="@id/takePhoto"
        app:layout_constraintStart_toStartOf="parent" />

    <com.google.android.material.floatingactionbutton.FloatingActionButton
        android:id="@+id/takePhoto"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_marginBottom="@dimen/standard_double_margin"
        android:contentDescription="@string/take_photo"
        android:tint="@android:color/white"
        app:backgroundTint="@color/colorPrimary"
        app:fabCustomSize="72dp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:srcCompat="@drawable/ic_baseline_photo_camera_24" />

    <com.google.android.material.button.MaterialButton
        android:id="@+id/send"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_alignParentEnd="true"
        android:contentDescription="@string/take_photo_switch_camera"
        android:paddingStart="24dp"
        android:paddingTop="16dp"
        android:paddingEnd="24dp"
        android:paddingBottom="16dp"
        android:text="@string/take_photo_send"
        android:textAllCaps="false"
        android:textColor="@color/white"
        android:textSize="16sp"
        android:theme="@style/Button.Primary"
        android:tint="@android:color/white"
        android:visibility="gone"
        app:backgroundTint="@color/colorPrimary"
        app:cornerRadius="48dp"
        app:elevation="0dp"
        app:icon="@drawable/ic_send"
        app:iconGravity="textStart"
        app:iconPadding="8dp"
        app:iconSize="24dp"
        app:iconTint="@color/white"
        app:layout_constraintBottom_toBottomOf="@id/takePhoto"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toEndOf="@id/takePhoto" />
</androidx.constraintlayout.widget.ConstraintLayout>