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Index
App Inventor
A Note Regarding Supplemental Files Foreword Preface
A Blocks Language for Mobile Phones What Can You Do with App Inventor? Why App Inventor Works What Kind of Apps Can You Build? Who Can Build Apps? Conventions Used in This Book How to Use This Book Acknowledgments
1. Hello Purr
What You’ll Learn The App Inventor Environment Designing the Components
Making a Label Adding the Button Adding the Meow Sound
Adding Behaviors to the Components
Making the Kitty Meow Adding a Purr Shaking the Phone
Packaging the App for Downloading Sharing the App Variations Summary
I. 12 Customizable Apps
2. PaintPot
What You’ll Learn Getting Started Designing the Components
Creating the Color Buttons Using Arrangements for Better Layouts Adding the Canvas Arranging the Bottom Buttons and the Camera Component
Adding Behaviors to the Components
Adding the Touch Event to Draw a Dot Adding the Drag Event That Draws a Line Adding Button Event Handlers Letting the User Take a Picture Changing the Dot Size
Using variables Changing the values of variables
The Complete App: PaintPot Variations Summary
3. MoleMash
What You’ll Build What You’ll Learn Getting Started
Designing the Components
Placing the Action components Placing the Label components
Adding Behaviors to the Components
Moving the Mole Creating MoveMole
Calling MoveMole when the app starts Calling MoveMole every second
Keeping Score Resetting the Score Adding Behavior When the Mole Is Touched
The Complete App: MoleMash Variations Summary
4. No Texting While Driving
What You’ll Learn Getting Started
Designing the Components Adding Behaviors to the Components
Programming an autoresponse How the blocks work
Entering a Custom Response
How the blocks work
Storing the Custom Response in a Database
How the blocks work
Retrieving the Custom Response When the App Opens
How the blocks work
Speaking the Incoming Texts Aloud
How the blocks work
Adding Location Information to the Response
How the blocks work
Sending the Location As Part of the Response
How the blocks work
The Complete App: No Texting While Driving Variations Summary
5. Ladybug Chase
What You’ll Build What You’ll Learn Designing the Components Getting Started Animating the Ladybug
Adding the Components Adding the Behavior
Displaying the Energy Level
Adding a Component Creating a Variable: Energy Drawing the Energy Bar Starvation
Adding an Aphid
Adding an ImageSprite Controlling the Aphid
How the blocks work
Having the Ladybug Eat the Aphid
How the blocks work
Detecting a Ladybug–Aphid Collision
How the blocks work
The Return of the Aphid
How the blocks work
Adding a Restart Button Adding the Frog
Having the Frog Chase the Ladybug
How the blocks work
Having the Frog Eat the Ladybug
How the blocks work
The Return of the Ladybug
How the blocks work
Adding Sound Effects Variations Summary
6. Paris Map Tour
What You’ll Learn Designing the Components Setting the Properties of ActivityStarter Adding Behaviors to the Components
Creating a List of Destinations Letting the User Choose a Destination
How the blocks work
Opening Maps with a Search
How the blocks work
Setting Up a Virtual Tour
Finding the DataUri for Specific Maps Defining the dataURIs List Modifying the ListPicker.AfterPicking Behavior
How the blocks work
Variations Summary
7. Android, Where’s My Car?
What You’ll Learn Getting Started Designing the Components Adding Behaviors to the Components
Displaying the Current Location
How the blocks work
Recording the Current Location
How the blocks work
Displaying Directions to the Remembered Location
How the blocks work
Storing the Remembered Location Persistently
How the blocks work
Retrieving the Remembered Location When the App Launches
How the blocks work
The Complete App: Android, Where’s My Car? Variations Summary
8. Presidents Quiz
What You’ll Learn Getting Started Designing the Components Adding Behaviors to the Components
Defining the Index Variable Displaying the First Question
How the blocks work
Iterating Through the Questions
How the blocks work
Making the Quiz Easy to Modify
How the Blocks Work
Switching the Image for Each Question
How the Blocks Work
Checking the User’s Answers
How the Blocks Work How the Blocks Work
The Complete App: The Presidents Quiz Variations Summary
9. Xylophone
What You’ll Build What You’ll Learn Getting Started Designing the Components Creating the Keyboard
Creating the First Note Buttons Adding the Sound Component Connecting the Sounds to the Buttons Telling Android to Load the Sounds Implementing the Remaining Notes
Recording and Playing Back Notes
Adding the Components Recording Notes and Times
How the blocks work
Playing Back Notes
How the blocks work
Playing Back Notes with Proper Delays
How the blocks work
Variations Summary
10. MakeQuiz and TakeQuiz
What You’ll Learn Getting Started Designing the Components Adding Behaviors to the Components
Recording the User’s Entries
How the blocks work
Blanking Out the Question and Answer
How the blocks work
Displaying Question-Answer Pairs on Multiple Lines
How the blocks work Calling the new procedure
Storing the Questions and Answers in a Database
How the blocks work
Loading Data from the Database
How the blocks work How the blocks work
The Complete App: MakeQuiz TakeQuiz: An App for Taking the Quiz in the Database TakeQuiz: Modifying the Blocks to Load the Quiz from the Database
How the Blocks Work
The Complete App: TakeQuiz Variations Summary
11. Broadcast Hub
What You’ll Learn Getting Started Designing the Components Adding Behaviors to the Components
How the Blocks Work Adding Someone to the Broadcast List
How the blocks work
Broadcasting Messages
How the blocks work
Cleaning Up Your List Display
How the blocks work
Logging the Broadcasted Texts
How the blocks work
Storing the BroadcastList in a Database
How the blocks work
Loading the BroadcastList from a Database
How the blocks work
The Complete App: Broadcast Hub Variations Summary
12. NXT Remote Control
What You’ll Learn Getting Started Designing the Components
Non-Visible Components Visible Components
Adding Behaviors to the Components
Connecting to the NXT Displaying the List of Robots
How the blocks work
Making the Bluetooth Connection
How the blocks work
Disconnecting from the NXT
How the blocks work
Driving the NXT
How the blocks work
Using the Ultrasonic Sensor to Detect Obstacles
How the blocks work
Variations Summary
13. Amazon at the Bookstore
What You’ll Learn What Is an API? Designing the Components Designing the Behavior
Searching by Keyword
How the blocks work
Searching by ISBN
How the blocks work
Don’t Leave Your Users Hanging
How the blocks work
Scanning a Book
How the blocks work
Improving the Display
How the blocks work
Customizing the API Variations Summary
II. Inventor’s Manual
14. Understanding an App’s Architecture
Components Behavior
An App As a Recipe An App As a Set of Event Handlers Event Types
User-initiated events Initialization events Timer events Animation events External events
Event Handlers Can Ask Questions Event Handlers Can Repeat Blocks Event Handlers Can Remember Things Event Handlers Can Talk to the Web
Summary
15. Engineering and Debugging an App
Software Engineering Principles
Design for Real People with Real Problems Build a Quick Prototype and Show It to Your Prospective Users Incremental Development Design Before Coding Comment Your Code Divide, Layer, and Conquer Understand Your Language: Tracing with Pen and Paper
Debugging an App
Watching Variables Testing Individual Blocks Incremental Development with Do It Activating and Deactivating Blocks
Summary
16. Programming Your App’s Memory
Named Memory Slots Properties Defining Variables Setting and Getting a Variable Setting a Variable to an Expression
Incrementing a Variable Building Complex Expressions Displaying Variables
Summary
17. Creating Animated Apps
Adding a Canvas Component to Your App The Canvas Coordinate System Animating Objects with Timer Events
Creating Movement Speed
High-Level Animation Functions
EdgeReached CollidingWith and NoLongerCollidingWith
Interactive Animation Specifying Sprite Animation Without a Clock Timer Summary
18. Programming Your App to Make Decisions: Conditional Blocks
Testing Conditions with if and ifelse Blocks Programming an Either/Or Decision Programming Conditions Within Conditions Programming Complex Conditions Summary
19. Programming Lists of Data
Creating a List Variable Selecting an Item in a List Using an Index to Traverse a List
Example: Traversing a List of Paint Colors
Creating Input Forms and Dynamic Lists
Defining a Dynamic List Adding an Item Displaying a List Removing an Item from a List
Lists of Lists Summary
20. Repeating Blocks: Iteration
Controlling an App’s Execution: Branching and Looping Repeating Functions on a List Using foreach
A Closer Look at Looping Writing Maintainable Code
A Second foreach Example: Displaying a List Repeating Blocks with while
Using while to Synchronously Process Two Lists Using while to Compute a Formula
Summary
21. Defining Procedures: Reusing Blocks
Eliminating Redundancy Defining a Procedure Calling a Procedure The Program Counter Adding Parameters to Your Procedure Returning Values from a Procedure Reusing Blocks Among Apps A Second Example: distanceBetweenPoints Summary
22. Working with Databases
Storing Persistent Data in TinyDB Retrieving Data from TinyDB Storing and Sharing Data with TinyWebDB Storing Data with TinyWebDB Requesting and Processing Data with TinyWebDB GetValue-GotValue in Action
A More Complex GetValue/GotValue Example Requesting Data with Various Tags Processing Multiple Tags in TinyWebDB.GotValue
Setting Up a Web Database Summary
23. Reading and Responding to Sensors
Creating Location-Aware Apps
GPS Sensing Location with App Inventor Checking Boundaries Location Information Providers: GPS, WiFi, and Cell ID
Using the Orientation Sensor
Using the Roll Parameter Moving Any Direction with Heading and Magnitude Using the Phone As a Compass
Using the Accelerometer
Responding to the Device Shaking Using the AccelerometerSensor’s Readings Detecting Free Fall Detecting Acceleration Using Calibrated Values
Summary
24. Communicating with Web APIs
Talking to Web APIs That Generate Images
Setting the Image.Picture Property to a Chart API Building a Chart API URL Dynamically
Talking to Web Data APIs
Exploring the Web Interface of an API Accessing the API Through TinyWebDB
Creating Your Own App Inventor–Compliant APIs
Customizing Template Code Wrapping the Yahoo! Finance API
Summary
Index About the Authors Colophon
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