App Inventor 2

Name: App Inventor 2 | Create Your Own Android Apps
Brand: O'Reilly
Price: 39.99 EUR
Availability: OnlineOnly

Create Your Own Android Apps

David Wolber(Author)

O'Reilly (Publisher)

1st Edition

Published on 13. October 2014

362 pages

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PDF with Adobe-DRM

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978-1-4919-0723-8 (ISBN)

€39.99incl. 7% vat

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Content

Cover
Copyright
Table of Contents
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
Using Code Examples
O'Reilly Safari
How to Contact Us
Acknowledgments
Part I. AI2 Tutorials
Chapter 1. HelloPurr
What You'll Learn
The App Inventor Environment
Designing the Components
Making a Label
Adding the Button
Adding the Meow Sound
Live Testing
Adding Behaviors to the Components
Making the Kitty Meow
Adding a Purr
Shaking the Device
Downloading the App to Your Android Device
Sharing the App
Variations
Summary
Chapter 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
Changing the Color
Letting the User Take a Picture
Changing the Dot Size
Referencing the dotSize Variable in DrawCircle
Changing the Value of dotSize
The Complete App: PaintPot
Variations
Summary
Chapter 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 the MoveMole Procedure
Calling MoveMole When the App Starts
Calling MoveMole every Second
Keeping Score
Procedural Abstraction
Resetting the Score
Vibrating When the Mole Is Touched
The Complete App: MoleMash
Variations
Summary
Chapter 4. No Texting While Driving
What You'll Learn
Getting Started
Designing the Components
Adding Behaviors to the Components
Auto-Responding to a Text
Entering a Custom Response
Storing the Custom Response Persistently
Retrieving the Custom Response When the App Opens
Speaking the Incoming Texts Aloud
Adding Location Information to the Response
Sending the Location as Part of the Response
The Complete App: No Texting While Driving
Variations
Summary
Chapter 5. Ladybug Chase
What You'll Build
What You'll Learn
Designing the Components
Getting Started
Placing the Initial Components
Adding Behaviors to the Components
Moving the Ladybug
Displaying the Energy Level
Starvation
Adding an Aphid
Programming the Ladybug to Eat the Aphid
Detecting a Ladybug-Aphid Collision
The Return of the Aphid
Adding a Restart Button
Adding the Frog
The Return of the Ladybug
Adding Sound Effects
The Complete App: Ladybug Chase
Variations
Summary
Chapter 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
Opening Maps with a Search URL
The Complete App: Map Tour with Activity Starter
A Virtual Tour with the Web Viewer
Finding the URL for Specific Maps
Defining the URLs List
Modifying the ListPicker.AfterPicking Behavior
The Complete App: Map Tour (Web Viewer)
Variations
Summary
Chapter 7. Android, Where's My Car?
What You'll Learn
Getting Started
Designing the Components
Adding Behaviors to the Components
Displaying the Current Location
Recording the Current Location
Displaying Directions to the Remembered Location
Storing the Remembered Location Persistently
Retrieving the Remembered Location When the App Launches
The Complete App: Android, Where's My Car?
Variations
Summary
Chapter 8. Presidents Quiz
What You'll Learn
Getting Started
Designing the Components
Adding Behaviors to the Components
Defining the Question and Answer Lists
Defining the Index Variable
Displaying the First Question
Iterating Through the Questions
Making the Quiz Easy to Modify
Switching the Image for Each Question
Checking the User's Answers
The Complete App: The Presidents Quiz
Variations
Summary
Chapter 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
Instructing Android to Load the Sounds
Implementing the Remaining Notes
Recording and Playing Back Notes
Adding the Components
Recording Notes and Times
Playing Back Notes
Playing Back Notes with Proper Delays
The Complete App: Xylophone
Variations
Summary
Chapter 10. MakeQuiz and TakeQuiz
What You'll Learn
Getting Started
Designing the Components
Adding Behaviors to the Components
Creating Empty Question and Answer Lists
Recording the User's Entries
Blanking Out the Question and Answer
Displaying Question-Answer Pairs on Multiple Lines
Calling the displayQAs Procedure
Saving the QAs Persistently on the Web
Loading Data from the Database
The Complete App: MakeQuiz
TakeQuiz: An App for Taking the Quiz in the Database
How the Blocks Work
The Complete App: TakeQuiz
Variations
Summary
Chapter 11. Broadcast Hub
What You'll Learn
Getting Started
Designing the Components
Adding Behaviors to the Components
Responding to Incoming Texts
Adding Numbers to the Broadcast List
Broadcasting the Messages
Beautifying the List Display
Logging the Broadcasted Texts
Storing the BroadcastList in a Database
Loading the BroadcastList from a Database
The Complete App: Broadcast Hub
Variations
Summary
Chapter 12. Robot Remote
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
Making the Bluetooth Connection
Disconnecting from the NXT
Driving the NXT
Using the Ultrasonic Sensor to Detect Obstacles
Variations
Summary
Chapter 13. Amazon at the Bookstore
What You'll Learn
What is an API?
Getting Started
Designing the Components
Programming the App's Behavior
Searching by Keyword
Searching by ISBN
Don't Leave Your Users Hanging
Scanning a Book
Improving the Display
The Complete App: Amazon at the Bookstore
Customizing the API
Variations
Summary
Part II. Inventor's Manual
Chapter 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 Interact with the Web
Summary
Chapter 15. Engineering and Debugging an App
Software Engineering Principles
Solve Real Problems
Build a Prototype and Show Users
Incremental Development
Design Before Coding
Comment Your Code
Divide, Layer, and Conquer
Understand Your Language: Tracking with Pen and Paper
Debugging an App
Watching Variables
Testing Individual Blocks
Incremental Development with Do It
Disabling Blocks
Summary
Chapter 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
Local Variables
Summary
Chapter 17. Creating Animated Apps
Adding a Canvas Component to Your App
The Canvas Coordinate System
Animating Objects with Timer Events
Creating Movement
Speed
Collision Detection
EdgeReached
CollidingWith and NoLongerCollidingWith
Interactive Animation
Specifying Sprite Animation Without a Clock Timer
Summary
Chapter 18. Programming Your App to Make Decisions: Conditional Blocks
Testing Conditions with if and else if Blocks
Programming an Either/Or Decision
Programming Conditions Within Conditions
Programming Complex Conditions
Summary
Chapter 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 Data
Defining a Dynamic List
Adding an Item
Displaying a List
Removing an Item from a List
Lists of Lists
Summary
Chapter 20. Repeating Blocks
Controlling an App's Execution: Branching and Looping
Iterating Functions on a List with for each
A Closer Look at Looping
Writing Maintainable Code
Using for each to Display a List
The while-do Block
Using while-do to Compute a Formula
Summary
Chapter 21. Defining Procedures and 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
The distanceBetweenPoints Procedure
Summary
Chapter 22. Working with Databases
Storing Persistent Data in TinyDB
Retrieving Data from TinyDB
Shared Data and TinyWebDB
Storing Data by Using TinyWebDB
Requesting and Processing Data with TinyWebDB
GetValue-GotValue in Action
A More Complex GetValue/GotValue Example
Requesting Data with Various Tags
Setting Up a Web Database
Summary
Chapter 23. Reading and Responding to Sensors
Creating Location-Aware Apps
The Global Positioning System
Sensing Location with App Inventor
Checking Boundaries
Location Information Providers: GPS, WiFi, and Cell ID
Using the Orientation Sensor
Using the Roll Parameter to Move an Object
Moving in Any Direction by Using 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
Summary
Chapter 24. Communicating with the Web
The WebViewer Component
The Web Component
TinyWebDB and TinyWebDB-Compliant APIs
Summary
Index
About the Authors

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