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  • Book Overview & Buying App Inventor 2 Essentials
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App Inventor 2 Essentials

App Inventor 2 Essentials

By : Kamriani, Roy
4.2 (9)
Buy this Book
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App Inventor 2 Essentials

App Inventor 2 Essentials

4.2 (9)
By: Kamriani, Roy
Buy this Book

Overview of this book

App Inventor 2 will take you on a journey of mobile app development. We begin by introducing you to the functionalities of App Inventor and giving you an idea about the types of apps you can develop using it. We walk you through the technical set up so you can take advantage of the interactive development environment (live testing). You will get hands-on, practical experience building three different apps using tutorials. Along the way, you will learn computer science principles as well as tips to help you prepare for the creative process of building an app from scratch. By the end of the journey, you will learn how to package an app and deploy it to app markets. App Inventor 2 Essentials prepares you to amass a resource of skills, knowledge and experience to become a mobile app developer
Table of Contents (10 chapters)
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Preface
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Preface
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What this book covers
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What you need to build mobile apps
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Who this book is for
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Conventions
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Reader feedback
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Customer support
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1
1. Unleashing Creativity with MIT App Inventor 2
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1. Unleashing Creativity with MIT App Inventor 2
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What is MIT App Inventor 2?
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MIT App Inventor – purpose and potential
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Summary
2
2. Setting Up MIT App Inventor 2
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2. Setting Up MIT App Inventor 2
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The initial setup
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Connectivity setup
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Summary
3
3. Navigating the App Inventor Platform
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3. Navigating the App Inventor Platform
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The projects view
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The Designer
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Creating a game app
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The Blocks editor
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Summary
4
4. Fling App – Part 2
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4. Fling App – Part 2
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Adding a scoring feature
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Increasing difficulty
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Changing the game's dynamic
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Creating levels
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Updating the score label to display the level
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Updating the Reset button
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Updating the Play button
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Summary
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5. Building an Event App
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5. Building an Event App
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User Interface for an event app
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Setting the background image
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Adding an image component
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Adding buttons
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Adding the ActivityStarter
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Adding screens
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Programming the blocks
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Summary
6
6. Introduction to Databases
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6. Introduction to Databases
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Creating a database
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Designing the RSVP screen
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Setting up Google Authentication
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Sharing the Fusion Table with the service account email
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Connecting the app to the Google Fusion Table
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Pushing data to the Fusion Table
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Ensuring empty rows are not inserted
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Viewing the guest list
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Coding the blocks – requesting data
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Coding the blocks – receiving data
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Sharing the Event App
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Summary
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7. Learning About Loops with a Raffle App
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7. Learning About Loops with a Raffle App
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Creating the project and building the GUI
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Summary
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8. Expanding Your Mobile App Development Skills
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8. Expanding Your Mobile App Development Skills
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Design principles
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App Inventor extras
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Distributing your app
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Summary
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Index
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Index

Adding a scoring feature

Since most game apps include some sort of scoring feature, we will add this code to our Fling app. The score will display in the same label that will also display the Game Over text.

Coding scoring blocks

We left off in the last chapter with the ball bouncing off all the edges except the bottom edge. Now, we want to program the app to increase the score by one point every time the ball reaches the top edge. We will use another if/then block and add it into the else portion of the existing if/then/else block within the when Ball1.EdgeReached event, as shown in the following screenshot:

Can you guess what block will fit in the if opening? If the ball hits the top edge, then the app will increase the score by 1. In Chapter 3, Navigating the App Inventor Platform, you learned that the bottom edge is represented by -1 (and the top edge is represented by 1). Since we've already created an if/then scenario for the ball hitting the bottom edge, we can copy this set of blocks...

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Programming languages
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App Inventor 2 Essentials
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