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  • Book Overview & Buying Near Field Communication with Android Cookbook
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Near Field Communication with Android Cookbook

Near Field Communication with Android Cookbook

By : Subtil
4 (1)
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Near Field Communication with Android Cookbook

Near Field Communication with Android Cookbook

4 (1)
By: Subtil
Buy this Book

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.
Table of Contents (12 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 for this book
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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. Getting Started with NFC
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1. Getting Started with NFC
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Introduction
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Requesting NFC permissions
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Indicating that your app uses NFC
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Defining minimal requirements
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Verifying whether the device has an NFC adapter
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Downloading Open NFC Android Edition
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Downloading Open NFC SDK Edition
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Configuring the Open NFC Android add-on into your Android SDK
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Configuring an NFC-enabled testing AVD
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Configuring the Connection Center tool
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Testing your app all together
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2. Detecting a Tag
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2. Detecting a Tag
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Introduction
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Understanding the foreground dispatch system
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Understanding the tag dispatch system
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Verifying if your app started because of an NFC intent
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Filtering tags by their content type
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Filtering tags by their content type programmatically
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Filtering tags by their technology
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Filtering tags by their technology using programs
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Filtering URI tags
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3. Writing Tag Content
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3. Writing Tag Content
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Introduction
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Working with the NDEF record
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Writing a URI-formatted record
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Writing a text-formatted record
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Using Android Application Record
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Working with external types
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Working with custom mimes
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4. Writing Tag Content – Real-life Examples
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4. Writing Tag Content – Real-life Examples
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Introduction
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Making a phone call with one tap – Part 1
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Sending a predefined SMS – Part 1
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Visiting our website
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Leaving a (small) note – Part 1
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5. Reading Tag Content
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5. Reading Tag Content
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Introduction
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Obtaining NDEF Message from Intent
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Getting the data out of the message
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Reading a text-formatted record
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Reading a URI-formatted record
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Reading external types
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Reading custom mimes
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6. Reading Tag Content – Real-life Examples
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6. Reading Tag Content – Real-life Examples
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Introduction
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Making a phone call with one tap – Part 2
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Sending a predefined SMS – Part 2
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Leaving a (small) note – Part 2
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Getting the tag information
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7. Sharing Content across Devices
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7. Sharing Content across Devices
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Introduction
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Creating a basic peer-to-peer Hello World application
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Sending texts to other devices
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Sending a friend invite on Facebook
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Inviting a friend to play a game – Part 1
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8. Error Handling and Content Validation
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8. Error Handling and Content Validation
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Introduction
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Handling tag-writing errors
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Handling tag-reading errors
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Testing the tag data for integrity
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9. Extending NFC
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9. Extending NFC
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Introduction
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Turning other adapters on/off
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Configuring a Wi-Fi network
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Starting a Wi-Fi hotspot
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Inviting a friend to play a game – Part 2
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Controlling hotel room access with Arduino and NFC – Part 1
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Controlling hotel room access with Arduino and NFC – Part 2
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10. Real-life Examples – NFC Utilities
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10. Real-life Examples – NFC Utilities
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Introduction
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Creating multi-action tags
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Choosing the best format for our data
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Locking tags
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Joking with a friend
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Index
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Index

Indicating that your app uses NFC

This step isn't required, but it is always good practice to specify the features used in our app manifest file—if it is indeed a required feature for our application to work correctly. Google Play Store uses this information to filter the apps visible to users based on their device's specifications. Users with incompatible devices will be able to install the application if we don't specify this, and we don't want that. We don't want users to get frustrated with a non-working application and give us negative feedback.

How to do it…

We are going to continue adding functionality to the previously created project by declaring the features required by our application in the manifest as follows:

  1. Open the NfcBookCh1Example1 project created in the previous recipe.
  2. Open the AndroidManifest.xml file located in the project root and add the following code just before the application node. Since NFC is a required feature in our application, we should also set the required attribute to true, as shown in the following line of code:
    <uses-feature android:name="android.hardware.nfc"  android:required="true" />

How it works…

The Android market uses this information in the manifest to filter the apps visible to the users. This way, if your device doesn't support a required feature of an app, there's no need for that app to appear listed; it will still be listed on the website but we cannot install it since it's incompatible. This application node is not required, but it's a good idea to place it. Otherwise, the user will be disappointed with the app—it will probably just crash or show an an error occurred! message. Users don't like that, and this results in a bad rating.

An alternative is to have multiple approaches for the same result. For example, if the user's device isn't NFC enabled, use a QR code instead (when applicable).

CONTINUE READING
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Tech Concepts
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Programming languages
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