You asked for a tool that can be used by "a normal person". A normal person is definitely not capable of creating an android app, so I really don't see your point. You need to learn how to do it, both on Android and on the web.
Moreover, the layout editor is rarely used in Android development, most of the control is done via code because it depends on dynamic content that is not available to the layout editor ahead of runtime. Most the examples in the exact link you attached are code examples for this very same reason
Here is a screenshot of Android Studio using a point-and-click layout editor to create responsive design, with no manual editing of code: https://developer.android.com/static/images/screens_support/... https://developer.android.com/guide/topics/large-screens/sup... It's very reminiscent of Visual Basic.