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Learning MIT App Inventor: A Hands-On Guide to Building Your Own Android Apps by Mark Sherman, Derek Walter

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Additional Exercises

Some additional exercises you can try include the following:

1. The color scheme for this app was loosely based on Jackson Pollock’s Autumn Rhythm. Try changing the color of the paint and the canvas for a different aesthetic.

2. The radius of Circle in the instructions was set to 10. Of course, you can change this. Right now, it’s “hard-coded” with a number block. Expand the app so that users can change the radius as they paint. You’ll need another component, and you need to have that component change a value that somehow will be hooked up to the radius. May I recommend a slider?

3. The canvas has other drawing features that we haven’t used in this app. What else can you draw? Can you add features to the app to let the user ...

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