Chapter 4. Fling App – Part 2

In Chapter 3, Navigating the App Inventor Platform, you learned to use the MIT App Inventor Designer and Blocks Editor by creating your first fully functional mobile app! In this chapter, we will show you how you can take the basic Fling app and build it out by adding more complex features. We will demonstrate how to enable:

• A scoring mechanism that will display when the ball touches the top edge

• Code, so the ball can only be flung from the lower half of the screen

• The increasing levels of difficulty by increasing ball speed

We will also begin debugging. Debugging is a standard practice in app development and should be viewed as part of the process, not as something negative.

Each time you add new components to your app, we encourage you to share your app with others to get feedback. Not only will the feedback give you ideas about the design, but it will also help you learn what users want from an app game. Such information will prove invaluable once you begin designing...