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• Uploading and using media files in App Inventor • Playing and looping sound files • Arranging and placing user interface elements where you want them In the previous chapter, you walked through the process of creating your design goals, primitives, and process. in this chapter, you take all of that from the previous chapter and put it into play. I also walk you through several complex algorithms. Take special note of the method for placing and centering user interface elements on the screen. You need to reuse this method for almost any project you create. Creating user interfaces in App Inventor can be frustrating until you master the method of using invisible padding elements to adjust visible elements on [...]