UNIT 5: APP INVENTOR 2 (LEARN TO MAKE YOUR OWN APP'S)

Xylophone - App Inventor 2 - Advanced Tutorial

 

It’s hard to believe that using technology to record and play back music only dates back to 1878, when Edison patented the phonograph. We’ve come so far since then—with music synthesizers, CDs, sampling and remixing, phones that play music, and even long-distance jamming over the Internet.

 

In this tutorial, you’ll take part in this tradition by building a Xylophone app that records and plays music.

 

What You’ll Build

 

With the app , you can:

 

• Play eight different notes by touching colored

buttons on the screen.

• Press a Play button to replay the notes you played

earlier.

• Press a Reset button to make the app clear any

notes you played earlier so that you can enter a

new song.

 

What You’ll Learn

 

This tutorial covers the following concepts:

 

• Using a single Sound component to play different audio files.

 

• Using the Clock component to measure and enforce delays between actions.

 

• Deciding when to create a procedure.

 

• Creating a procedure that calls itself.

 

• Advanced use of lists, including adding items, accessing them, and clearing the list.