2. Detecting a Tag | Near Field Communication with Android Cookbook

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Near Field Communication with Android Cookbook

By : Subtil

4 (1)

Near Field Communication with Android Cookbook

4 (1)

By: Subtil

Overview of this book

An easy-to-follow guide, full of hands-on examples of and real-world applications. Each recipe is explained and placed in context. If you want to learn how to create NFC-enabled Android applications, this is the book for you. Perhaps you already know a bit about Android application developments but have never used NFC, or perhaps you know a little about NFC android development but want some more advanced features and examples. In either case, this book will get you up and running quickly. You are expected to have Android programming knowledge.

Preface

Preface

What this book covers

What you need for this book

Who this book is for

Conventions

Reader feedback

Customer support

Free Chapter

1. Getting Started with NFC

1. Getting Started with NFC

Introduction

Requesting NFC permissions

Indicating that your app uses NFC

Defining minimal requirements

Verifying whether the device has an NFC adapter

Downloading Open NFC Android Edition

Downloading Open NFC SDK Edition

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

Configuring an NFC-enabled testing AVD

Configuring the Connection Center tool

Testing your app all together

2. Detecting a Tag

2. Detecting a Tag

Introduction

Understanding the foreground dispatch system

Understanding the tag dispatch system

Verifying if your app started because of an NFC intent

Filtering tags by their content type

Filtering tags by their content type programmatically

Filtering tags by their technology

Filtering tags by their technology using programs

Filtering URI tags

3. Writing Tag Content

3. Writing Tag Content

Introduction

Working with the NDEF record

Writing a URI-formatted record

Writing a text-formatted record

Using Android Application Record

Working with external types

Working with custom mimes

4. Writing Tag Content – Real-life Examples

4. Writing Tag Content – Real-life Examples

Introduction

Making a phone call with one tap – Part 1

Sending a predefined SMS – Part 1

Visiting our website

Leaving a (small) note – Part 1

5. Reading Tag Content

5. Reading Tag Content

Introduction

Obtaining NDEF Message from Intent

Getting the data out of the message

Reading a text-formatted record

Reading a URI-formatted record

Reading external types

Reading custom mimes

6. Reading Tag Content – Real-life Examples

6. Reading Tag Content – Real-life Examples

Introduction

Making a phone call with one tap – Part 2

Sending a predefined SMS – Part 2

Leaving a (small) note – Part 2

Getting the tag information

7. Sharing Content across Devices

7. Sharing Content across Devices

Introduction

Creating a basic peer-to-peer Hello World application

Sending texts to other devices

Sending a friend invite on Facebook

Inviting a friend to play a game – Part 1

8. Error Handling and Content Validation

8. Error Handling and Content Validation

Introduction

Handling tag-writing errors

Handling tag-reading errors

Testing the tag data for integrity

9. Extending NFC

9. Extending NFC

Introduction

Turning other adapters on/off

Configuring a Wi-Fi network

Starting a Wi-Fi hotspot

Inviting a friend to play a game – Part 2

Controlling hotel room access with Arduino and NFC – Part 1

Controlling hotel room access with Arduino and NFC – Part 2

10. Real-life Examples – NFC Utilities

10. Real-life Examples – NFC Utilities

Introduction

Creating multi-action tags

Choosing the best format for our data

Locking tags

Joking with a friend

Index

Index

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Understanding the tag dispatch system

The Android system has a structured way to deal with the different tag types, technologies, and content. In this recipe, we will create a simple app that will allow us to visualize the implemented structure.

How to do it...

By performing the following steps, we are going to create an application that will allow us to see the triggered action when we tag different tags in our device:

Open the MainActivity.java file from the previously created NfcBookCh2Example1 project.

On the onNewIntent method, add the following lines of code:

String action = intent.getAction();
Toast.makeText(this, action, Toast.LENGTH_SHORT).show();

Open the NFC Simulator tool and simulate a few taps for different tag types and then see the results.
In the NFC Simulator tool, when tag names end with _LOCKED, it means that the tags are formatted and have content on them; probably, an NDEF record. Therefore, the NDEF_DISCOVERED action will be triggered. Unformatted tags will trigger the...

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Programming languages

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