Some experience in at least one object-oriented programming language is strongly recommended.

I suggest playing with the code while you type it: try asking yourself if you could write a project in a different way. This will make the concepts much clearer and easier to reuse in your future projects. Answering the questions at the end of each project will also help you get a different perspective on the app you built in the chapter.

In this book, we use the Flutter version 1.12.13 and Dart version 2.7.2. In order to follow along with the code, you will need a Windows PC, Mac, Linux, or Chrome OS machine connected to the web, with the permissions to install new software. An Android or iOS device is suggested but not necessary as there are simulators/emulators that can run on your machine. All software used in this book is open source or free to use.

If you are using the digital version of this book, we advise you to type the code yourself or access the code via the GitHub repository (link available in the next section). Doing so will help you avoid any potential errors related to the copy/pasting of code.

If you like this book or want to share your ideas about it please write a review on your favorite platform. This will help us make this book better, and you'll also earn the author's and reviewers' everlasting gratitude.

You can download the example code files for this book from your account at www.packt.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.packt.com.
2. Select the Support tab.
3. Click on Code Downloads.
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/Flutter-Projects. 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!

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: "In the main.dart file, remove the example code."

A block of code is set as follows:

void main() {
 var name = "Dart";
 print ("Hello $name!");
}

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

return Stack(
   children: <Widget>[
      Positioned(
         child: Ball(), 
         top: posY,
         left: posX,
),

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

cd hello_world 
flutter run

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: "From the Android Studio File menu, select Open...."