activity_main.xml

 <com.google.android.material.floatingactionbutton.FloatingActionButton
        android:id="@+id/camera_fab"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginEnd="32dp"
        android:layout_marginBottom="32dp"
        android:clickable="true"
        android:focusable="true"
        app:layout_constraintBottom_toTopOf="@+id/main_add_fab"
        app:layout_constraintEnd_toEndOf="parent"
        app:srcCompat="@drawable/ic_outline_camera_alt_24" />

    <com.google.android.material.floatingactionbutton.FloatingActionButton
        android:id="@+id/import_image_fab"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginEnd="32dp"
        android:layout_marginBottom="32dp"
        android:clickable="true"
        android:focusable="true"
        app:layout_constraintBottom_toTopOf="@+id/camera_fab"
        app:layout_constraintEnd_toEndOf="parent"
        app:srcCompat="@drawable/ic_outline_folder_24" />

    <com.google.android.material.floatingactionbutton.FloatingActionButton
        android:id="@+id/main_add_fab"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginEnd="32dp"
        android:layout_marginBottom="32dp"
        android:clickable="true"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:srcCompat="@drawable/ic_baseline_add_24"
        android:focusable="true" />