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    USER INTERFACE (UI)                                                                      CHAPTER

                     PROGRAMMING AND LOGIC                                                                   B4

                        learning outcomes

                       The student will be able to:
                          understand User Interface (UI) and its key design principles.
                          design a Multiplication Table App using MIT App Inventor.
                          implement logic to generate and display multiplication tables.
                          test the app for accuracy and proper functionality.
                          debug common issues to improve app performance.

                     Have you ever wondered how a mobile app works? When you press a button in a game or

                     type something in a calculator app, you are using the User Interface (UI)! In this chapter,
                     we will learn how to  design  and  program  a  simple  app  in  MIT App  Inventor using  UI
                     components and logic.

                               WHAT IS A USER INTERFACE (UI)?

                     The User Interface (UI) is everything you see and touch on a screen when using an app. It
                     includes buttons, text, pictures and boxes where you can type. The UI helps people use the
                     app easily by making it simple to click, read and enter information.

                               KEY PRINCIPLES OF USER INTERFACE (UI) DESIGN

                     A good User Interface (UI) helps people use an app easily. It makes sure everything on
                     the screen is clear, simple and easy to understand. Here are some important rules that
                     make an app fun and easy to use:

                     1. CLARITY

                     Clarity means everything on the screen should be easy to see and understand. Buttons,
                     text and pictures should clearly show what they do so people don’t get confused.

                                                                                User Interface (UI) Programming and Logic  109

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