Conventions used

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

Code in text: 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: “runOnUIThread will perform the displayText(text) function on the main UI thread.”

A block of code is set as follows:

lifecycleScope.launch(Dispatchers.IO) {
     val fetchedText = fetchText()
       
     withContext(Dispatchers.Main) {
           displayText(fetchedText)
    }
}

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

private fun fetchTextWithThread() {
     Thread {
          // get text from network
          val text = getTextFromNetwork()
           runOnUiThread {
                // Display on UI
                displayText(text)
           }
      }.start()
}

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

java.lang.IllegalStateException: Module with the Main dispatcher had failed to initialize. For tests Dispatchers.setMain from kotlinx-coroutines-test module can be used

Bold: Indicates a new term, an important word, or words that you see onscreen. For instance, words in menus or dialog boxes appear in bold. Here is an example: “In Android Studio, the Editor window identifies the suspending function calls in your code with a gutter icon next to the line number.”

Tips or Important Notes

Appear like this.