To get the most out of this book

To get the most out of this book you'll need an Android Things Dev Kit and a Rainbow HAT because it will allow you to run all the examples in Chapter 2, The Rainbow HAT.

There are a lot of other hardware components that you don't require, but they are interesting to have just to see them working. I recommend that you acquire the ones you are interested in. We go into more detail about developer kits and how to pick the right one, as well as a summary of the other hardware, as part of Chapter 1, Introducing Android Things.

Download the example code files

You can download the example code files for this book from your account at www.packtpub.com. If you purchased this book elsewhere, you can visit www.packtpub.com/support and register to have the files emailed directly to you.

You can download the code files by following these steps:

1. Log in or register at www.packtpub.com.
2. Select the SUPPORT tab.
3. Click on Code Downloads & Errata.
4. Enter the name of the book in the Search box and follow the onscreen instructions.

Once the file is downloaded, please make sure that you unzip or extract the folder using the latest version of:

• WinRAR/7-Zip for Windows
• Zipeg/iZip/UnRarX for Mac
• 7-Zip/PeaZip for Linux

The code bundle for the book is also hosted on GitHub at https://github.com/PacktPublishing/Android-Things-Quick-Start-Guide. In case there's an update to the code, it will be updated on the existing GitHub repository.

We also have other code bundles from our rich catalog of books and videos available at https://github.com/PacktPublishing/. Check them out!

Download the color images

We also provide a PDF file that has color images of the screenshots/diagrams used in this book. You can download it here: http://www.packtpub.com/sites/default/files/downloads/AndroidThingsQuickStartGuide_ColorImages.pdf.

Code in action

Visit the following link to check out videos of the code being run:

http://bit.ly/2C4VX1M.

Conventions used

There are a number of text conventions used throughout this book.

CodeInText: Indicates code words in text, database table names, folder names, filenames, file extensions, pathnames, dummy URLs, user input, and Twitter handles. Here is an example: "There is also the concept of AutoCloseable, which is an interface that all the peripherals implement."

A block of code is set as follows:

dependencies {
    [...]
    implementation 'com.google.android.things.contrib:driver-rainbowhat:+'
}

When we wish to draw your attention to a particular part of a code block, the relevant lines or items are set in bold:

class MainActivity : Activity() {

  private lateinit var led: Gpio

  override fun onCreate(savedInstanceState: Bundle?) {
      super.onCreate(savedInstanceState)
      setup()
      while (true) {
         loop()
      }
  }

Any command-line input or output is written as follows:

$ sudo ./android-things-setup-utility-macos 

Bold: Indicates a new term, an important word, or words that you see onscreen. For example, words in menus or dialog boxes appear in the text like this. Here is an example: "We select Install Android Things."

Warnings or important notes appear like this.

Tips and tricks appear like this.