Technical requirements

If this is not your first Flutter app, then you probably already have everything you need installed.

Otherwise, you will need to install the following:

• An IDE of your choice that supports Flutter, such as Android Studio or VS Code
• The Flutter SDK

You can find all of the code required for this chapter here: https://github.com/PacktPublishing/Flutter-Design-Patterns-and-Best-Practices/tree/master/CH03.

You can find full versions of the source code snippets that we will be examining here:

• https://github.com/flutter/flutter/blob/master/packages/flutter/lib/src/widgets/framework.dart
• https://github.com/flutter/flutter/blob/master/packages/flutter/lib/src/foundation/change_notifier.dart
• https://github.com/flutter/flutter/blob/master/packages/flutter/lib/src/widgets/media_query.dart

What is state and why do you need to manage it?

You can probably guess that state is something integral to app development. You can further...