Conventions

In this book, you will find a number of text styles 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, and user input are shown as follows: "We will add proper log messages for each lifecycle event of the Application class and the screen (activity) we created."

A block of code is set as follows:

    override fun onCreate(savedInstanceState: Bundle?) { 
      super.onCreate(savedInstanceState) 
      setContentView(R.layout.activity_main) 
      Log.v(tag, "[ ON CREATE 1 ]") 
    } 

Any command-line input or output is written as follows. The input command might be broken into several lines to aid readability, but needs to be entered as one continuous line in the prompt:

sudo apt-get install libc6:i386 libncurse
libstdc++6:i386 lib32z1 libbz2-1.0:i386

New terms and important words are shown in bold. Words that you see on the screen, for example, in menus or dialog boxes, appear in the text like this: " Select Tools | Android | AVDManager or click on the AVDManager icon in the toolbar."