I finally got around to trying RemoteXY and I am very impressed. It seems a very easy way to create an Android control screen for an Arduino project.
I had originally misunderstood how it worked and I thought that the Web design page would generate a different Android app for each screen design and I was cautious about downloading unknown Android apps. In the meantime I developed EzScrn as a simple project for generating a browsed-based interface for controlling an Arduino and without realizing it used a similar concept with all the screen design elements in the Arduino code. That made me understand how RemoteXY works.
Because it uses a Browser for its GUI EzScrn will work on an any device that has a browser which may make it more versatile but, of course, there needs to be a PC or a Yun to run the server. And, unlike RemoteXY, there is no drag-and-drop screen designer for EzScrn.
...R