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"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/camera_layout_parent"
tools:context=".features.camera.CameraActivity">
<androidx.camera.view.PreviewView
android:id="@+id/viewFinder"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.5"
tools:layout_editor_absoluteX="89dp" />
<ImageButton
android:id="@+id/image_capture_button"
android:layout_width="80dp"
android:layout_height="80dp"
android:layout_marginBottom="20dp"
android:elevation="2dp"
android:background="@drawable/camera"
android:contentDescription="@string/take_photo"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toStartOf="@+id/viewFinder"
app:layout_constraintStart_toEndOf="@+id/viewFinder" />
<androidx.constraintlayout.widget.Guideline
android:id="@+id/vertical_centerline"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical"
app:layout_constraintGuide_percent=".50" />
</androidx.constraintlayout.widget.ConstraintLayout>