WIP

app/src/main/res/layout/activity_main.xml

@@ -3,6 +3,7 @@
 <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:id="@+id/activityMain"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
     android:orientation="vertical"