Near Field Communication with Android Cookbook

Table of Contents

Near Field Communication with Android Cookbook

Credits

About the Author

About the Reviewers

www.PacktPub.com

Support files, eBooks, discount offers, and more

Why Subscribe?

Free Access for Packt account holders

Preface

What this book covers

What you need for this book

Who this book is for

Conventions

Reader feedback

Customer support

Downloading the example code

Errata

Piracy

Questions

1. Getting Started with NFC

Introduction

Requesting NFC permissions

Getting ready

How to do it…

How it works…

Indicating that your app uses NFC

How to do it…

How it works…

Defining minimal requirements

How to do it…

How it works…

Verifying whether the device has an NFC adapter

How to do it…

How it works…

There's more…

Downloading Open NFC Android Edition

Getting ready

How to do it…

Downloading Open NFC SDK Edition

How to do it…

Configuring the Open NFC Android add-on into your Android SDK

Getting ready

How to do it…

How it works…

Configuring an NFC-enabled testing AVD

Getting ready

How to do it…

How it works…

There's more…

Configuring the Connection Center tool

Getting ready

How to do it…

How it works…

Testing your app all together

Getting ready

How to do it…

How it works…

2. Detecting a Tag

Introduction

Understanding the foreground dispatch system

How to do it...

How it works...

Understanding the tag dispatch system

How to do it...

How it works...

Verifying if your app started because of an NFC intent

How to do it...

How it works...

Filtering tags by their content type

How to do it...

How it works...

Filtering tags by their content type programmatically

How to do it...

How it works...

Filtering tags by their technology

How to do it...

How it works...

Filtering tags by their technology using programs

How to do it...

How it works...

Filtering URI tags

How to do it...

How it works...

3. Writing Tag Content

Introduction

Working with the NDEF record

Getting ready

How to do it...

How it works...

Writing a URI-formatted record

How to do it...

How it works...

Writing a text-formatted record

How to do it...

How it works...

Using Android Application Record

How to do it...

How it works...

Working with external types

How to do it...

How it works...

Working with custom mimes

How to do it...

How it works...

4. Writing Tag Content – Real-life Examples

Introduction

Making a phone call with one tap – Part 1

Getting ready

How to do it…

How it works…

Sending a predefined SMS – Part 1

How to do it…

How it works…

Visiting our website

How to do it…

How it works…

Leaving a (small) note – Part 1

How to do it…

How it works…

5. Reading Tag Content

Introduction

Obtaining NDEF Message from Intent

Getting ready

How to do it…

How it works…

Getting the data out of the message

How to do it…

How it works…

Reading a text-formatted record

Getting ready

How to do it…

How it works…

Reading a URI-formatted record

How to do it…

How it works…

Reading external types

How to do it…

How it works…

Reading custom mimes

How to do it…

How it works…

6. Reading Tag Content – Real-life Examples

Introduction

Making a phone call with one tap – Part 2

Getting ready

How to do it...

How it works...

Sending a predefined SMS – Part 2

Getting ready

How to do it...

How it works...

Leaving a (small) note – Part 2

Getting ready

How to do it...

How it works...

Getting the tag information

How to do it...

How it works...

7. Sharing Content across Devices

Introduction

Creating a basic peer-to-peer Hello World application

Getting ready

How to do it…

How it works…

Sending texts to other devices

How to do it…

How it works…

Sending a friend invite on Facebook

Getting ready

How to do it…

How it works…

Inviting a friend to play a game – Part 1

How to do it…

How it works…

8. Error Handling and Content Validation

Introduction

Handling tag-writing errors

Getting ready

How to do it...

How it works...

Handling tag-reading errors

Getting ready

How to do it...

How it works...

Testing the tag data for integrity

Getting ready

How to do it...

How it works...

9. Extending NFC

Introduction

Turning other adapters on/off

Getting ready

How to do it...

How it works...

Configuring a Wi-Fi network

How to do it...

How it works...

Starting a Wi-Fi hotspot

How to do it...

How it works...

Inviting a friend to play a game – Part 2

How to do it...

How it works...

Controlling hotel room access with Arduino and NFC – Part 1

How to do it...

How it works...

Controlling hotel room access with Arduino and NFC – Part 2

Getting ready

How to do it...

How it works...

10. Real-life Examples – NFC Utilities

Introduction

Creating multi-action tags

Getting ready

How to do it…

How it works…

Choosing the best format for our data

How to do it…

How it works…

Locking tags

How to do it…

How it works…

Joking with a friend

Getting ready

How to do it…

How it works…

Index

Near Field Communication with Android Cookbook

Near Field Communication with Android Cookbook

Copyright © 2014 Packt Publishing

All rights reserved. No part of this book may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, without the prior written permission of the publisher, except in the case of brief quotations embedded in critical articles or reviews.

Every effort has been made in the preparation of this book to ensure the accuracy of the information presented. However, the information contained in this book is sold without warranty, either express or implied. Neither the author, nor Packt Publishing, and its dealers and distributors will be held liable for any damages caused or alleged to be caused directly or indirectly by this book.

Packt Publishing has endeavored to provide trademark information about all of the companies and products mentioned in this book by the appropriate use of capitals. However, Packt Publishing cannot guarantee the accuracy of this information.

First published: June 2014

Production Reference: 1060614

Published by Packt Publishing Ltd.

Livery Place

35 Livery Street

Birmingham B3 2PB, UK.

ISBN 978-1-78328-965-3

www.packtpub.com

Cover Image by Ravaji Babu (<[email protected]>)

Credits

Author

Vitor Subtil

Reviewers

Dion Loughry

Michael Roland

Commissioning Editor

Kunal Parikh

Acquisition Editor

Rebecca Youé

Content Development Editors

Athira Laji

Rikshith Shetty

Technical Editors

Shubhangi Dhamgaye

Novina Kewalramani

Pratik More

Pratish Soman

Copy Editors

Alisha Aranha

Mradula Hegde

Adithi Shetty

Project Coordinator

Wendell Palmer

Proofreaders

Simran Bhogal

Maria Gould

Ameesha Green

Paul Hindle

Indexer

Mariammal Chettiyar

Production Coordinator

Adonia Jones

Cover Work

Adonia Jones

About the Author

Vitor Subtil has been a web developer since 2009 and has been working with ASP.NET, C#, Oracle, and FluentNhibernate in the development of Enterprise Management applications. He started using MVC and SOA quite recently.

He is currently pursuing his final year graduate studies in Computer Engineering, where he got introduced to the NFC technology and became a fan thereafter.

He is enthusiastic about new technologies such as HTML5, CSS3, and Android. He loves using the JQuery framework for JavaScript programming and uses new features of HTML5 such as OfflineStorage, the History API, and Canvas. His current focus is on developing Android applications.

I would like to thank my girlfriend, Sandra, for all the time she spent helping me and all that she did for me in some difficult situations that occurred while writing this book. This book would have not been possible without her.

About the Reviewers

Dion Loughry has been professionally involved in the IT field for nearly 20 years now. While he has been managing the support for end users for the most of his career, he has always stayed on top of cutting-edge technology and innovation. He has incorporated this habit as much as possible into his personal life and business as well. A great example of this was when he first saw a PC in 1980. He managed to save and borrow enough money to purchase one at that time. In addition, he quickly learned how to program in the BASIC language. His passion lies in using new technology at the workplace to improve efficiency as well as simplify life in general. NFC technology is the next great leap that provides a simplified way of sharing and obtaining information. He has been involved with the NFC technology for a number of years. He has always been a fan of Palm Technology and has worked with a few members of the original Palm development team. He is currently working on many applications for Android and Windows devices. This is a great step into the world of unplugged computing technology and information sharing, which has great potential, yet is widely untapped.

Michael Roland is a researcher at the NFC Research Lab, Hagenberg (University of Applied Sciences, Upper Austria). His main research interests are NFC, security, and Android. He is the creator of NFC TagInfo, one of the most successful NFC developer tools for Android devices, and the co-author of the book Anwendungen und Technik von Near Field Communication (NFC), Springer Publishing. He holds a BSc. and an MSc. degree in Embedded Systems Design (University of Applied Sciences, Upper Austria, 2007 and 2009, respectively) and a PhD. (Dr. Techn.) degree in Computer Science (Johannes Kepler University Linz, 2013).

www.PacktPub.com

Support files, eBooks, discount offers, and more

You might want to visit www.PacktPub.com for support files and downloads related to your book.

Did you know that Packt offers eBook versions of every book published, with PDF and ePub files available? You can upgrade to the eBook version at www.PacktPub.com and as a print book customer, you are entitled to a discount on the eBook copy. Get in touch with us at for more details.

At www.PacktPub.com, you can also read a collection of free technical articles, sign up for a range of free newsletters and receive exclusive discounts and offers on Packt books and eBooks.

http://PacktLib.PacktPub.com

Do you need instant solutions to your IT questions? PacktLib is Packt's online digital book library. Here, you can access, read and search across Packt's entire library of books.

Why Subscribe?

Fully searchable across every book published by Packt

Copy and paste, print and bookmark content

On demand and accessible via web browser

Free Access for Packt account holders

If you have an account with Packt at www.PacktPub.com, you can use this to access PacktLib today and view nine entirely free books. Simply use your login credentials for immediate access.

Preface

Mobile technologies are constantly changing, providing users with faster and better ways to interact with the world. Devices and applications have become increasingly powerful and new technologies are continually emerging—near field communication (NFC) is one of them. Its low battery consumption and simplicity are the key factors determining its future success. From facilitating daily tasks, such as opening a website, gaining access control, and making instant payments, NFC is now being used everywhere. Features such as peer-to-peer communication, cross-device data exchange, social network content sharing, and improved gaming experiences can be achieved using NFC.

The book begins by introducing the virtual development environment that allows you to develop NFC-enabled applications without the need of a smartphone or tags. Next, this book presents simple and functional examples that explain the basic concepts of detecting, writing, and reading data from a tag. All of the presented features and techniques are then used in a more complex application to give you a better idea of how you can use NFC in a real application.

In this book, you will learn how to use different components and features, such as working with the Foreground Dispatch System, using the NFC data exchange format and the Android application record, reading and writing a URI, creating text and customizing mime NDEF messages, and so on. This book provides readers with both theoretical and practical knowledge as we progress through the recipes and explain the relevant concepts.

Toward the end of this book, the recipes will show you various ways to use NFC so that you will be pumped to start developing amazing NFC applications.

What this book covers

Chapter 1, Getting Started with NFC, covers the basic steps to create an NFC-enabled application by defining the minimum requirements and the first lines of code needed to use NFC. This chapter also covers how to set up a virtual test environment using Open NFC for an Android add-on.

Chapter 2, Detecting a Tag, introduces readers to the detection, interception, and filtering of NFC intents, using the Foreground Dispatch System and intent filters. A technical overview of the different types of tags and a series of practical examples explains how you could go about doing this.

Chapter 3, Writing Tag Content, covers the introduction to the NDEF records by explaining how this format is useful and the different possible usages. This chapter provides practical working examples that demonstrate the correct NDEF usage.

Chapter 4, Writing Tag Content – Real-life Examples, provides more detailed examples on writing different content to NFC tags by providing working application prototypes.

Chapter 5, Reading Tag Content, introduces the reading of an NFC tag content and how to handle different types of content.

Chapter 6, Reading Tag Content – Real-life Examples, covers more detailed examples on reading tag content. At the end of every recipe, a working application is created to provide insight into the NFC capabilities.

Chapter 7, Sharing Content across Devices, covers a more advanced NFC feature, peer-to-peer communication. This chapter provides working application prototypes that demonstrate how the NFC peer-to-peer feature can be used in gaming and social networking applications.

Chapter 8, Error Handling and Content Validation, covers the basics on how to prevent the NFC application from crashing by correctly handling and preventing exceptions.

Chapter 9, Extending NFC, covers how NFC can be used to complement other Android features by providing practical working examples of applications that facilitate a user's interaction with the world.

Chapter 10, Real-life Examples – NFC Utilities, covers some tips on how to make the best use of an NFC tag. This chapter also provides a working application prototype to allow for a full-learning experience.

What you need for this book

Readers must have basic knowledge of Java and Android application development.

An NFC-enabled device and physical tags are recommended but not required. This is because readers can use the virtual environment to administer development tests.

The software used during the writing of this book was Eclipse, so we recommend a working installation that is configured with Android SDK.

Who this book is for

Near Field Communication with Android Cookbook focuses on employing NFC features in useful, real-life applications. It is ideal for developers who want to learn how to create NFC-enabled Android applications. Basic Android development knowledge is preferred, but the main objective is to get readers excited about this technology! We do this by providing you with a solid grounding in the use of NFC with Android as well as some advanced examples.

Conventions

In this book, you will find a number of styles of text that distinguish between different kinds of information. Here