Conventions

In this book, you will find a number of styles of text that distinguish between different kinds of information. Here are some examples of these styles, and an explanation of their meaning.

Code words in text, database table names, folder names, filenames, file extensions, pathnames, dummy URLs, user input, and Twitter handles are shown as follows: "nfcbook.ch1.example1."

A block of code is set as follows:

NfcAdapter nfcAdapter = NfcAdapter.getDefaultAdapter(this);

if (nfcAdapter != null && nfcAdapter.isEnabled()) {
  Toast.makeText(this, "NFC is available.", Toast.LENGTH_LONG).show();
} else {
  Toast.makeText(this, "NFC is not available on this device. This application may not work correctly.", 
Toast.LENGTH_LONG).show();
} 

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

<uses-permission android:name="android.permission.NFC" />

New terms and important words are shown in bold. Words that you see on the screen, in menus or dialog boxes for example, appear in the text like this: "A Beam sent! toast should appear in the touched device and a Facebook friend request dialog should appear in the other."