App Inventor Tutorial ebook now also available from Nook Books + others

You can support this tutorial effort by purchasing a copy of the e-book from any of the following e-book vendors – thank you for your help!

Sorry for the “spam” – this is to update the earlier post with the news that the ebook is now available from Nook Press. It took longer than expected for that version of the book to go live.

Just USD $2.99! Instant e-book delivery!

Available from

Changing an App Inventor button’s color continuously

How to implement a button that continuously changes color, as demonstrated in this video example:

The Designer View

Create a simple user interface with two buttons – one to start the color change and the other to stop the color changes. In the button properties, set the button shape to “oval”.



Drag a clock component into the Designer – the Clock will appear as a non-visible component at the bottom of the Viewer.

Blocks Code

Continue reading Changing an App Inventor button’s color continuously

Blockly – a Javascript programming system inspired by App Inventor

Blockly is intended for use by software developers (rather than children learning to code) to generate Javascript:

Blockly was influenced by App Inventor, which in turn was influenced by Scratch, which in turn was influenced by StarLogo. As a result, children who are familiar with one have no difficulty moving to another.

via Blockly — Google Developers.

Actually, it can output Javascript, Python and Dart programs too 🙂


App Inventor Tutorial e-book now available from Google Play Books, Apple Books, Amazon, Kobo and Nook Books

My App Inventor 2: Tutorial e-book – the fast and easy way to create Android apps – is now available from Amazon, Google Play Books, Apple Books via iTunes, and Kobo! And its very inexpensive – less than USD $3.00! Less than a latte!

Read it anyway you want!

Read on the e-book on the Kindle or Amazon Fire, read on Kindle for Android free apps,  read on your PC or Mac, reading using the Google Play Books app on your phone or tablet, read on iPads or Mac OS X, or the Kobo reader software (all platforms!

Depending on the vendor, you may download a free sample!



  Google Play Books


Apple Books via the iTunes Store: App Inventor 2 Tutorial – Edward Mitchell


Kobo Books


Nook Books


Changing the color of a button (or other components) in App Inventor

This tutorial covers the simple changing of the color of a button, while the app is running. You may also set a component’s color by changing the color properties on the Properties list in the Designer.

A second tutorial will show how to implement the continuously changing color demonstrated in the video example. That will be posted next!

The Designer View

To demonstrate the “simple” version, create an app with this user interface:


That’s simple!

Each time the button is pressed, the color of the button will change.

Blocks Code

Continue reading Changing the color of a button (or other components) in App Inventor