Learning MIT App Inventor: A Hands-On Guide to Building Your Own Android Apps

Clicker-Counter App

Consider an example: a Clicker-Counter app. Counting clickers are often used in theaters, auditoriums, and other large-group settings to count how many people enter; an attendant simply clicks a button for each person who comes in. We’re going to make a basic counter, but it can be extended to count anything, or any number of things, like a baseball umpire’s counter or a billiards scorekeeper.

All we need for this app is a single button. You might want to adjust its size properties to make it nice and big on the screen. For instance, you can set the width to Fill Parent and the height to 300 pixels. I renamed the button from Button1 to TheButton. You might also want to make the font size bigger and change the text to the number ...